A stove or range is a device that generates heat inside or on top of the device, for local heating or cooking . Stoves can be powered with many fuels, such as electricity, natural gas , gasoline , wood , and coal .
105-480: Due to concerns about air pollution, efforts have been made to improve stove design. Pellet stoves are a type of clean-burning stove . Air-tight stoves are another type that burn the wood more completely and therefore, reduce the amount of the combustion by-products. Another method of reducing air pollution is through the addition of a device to clean the exhaust gas, for example, a filter or afterburner. Research and development on safer and less emission releasing stoves
210-751: A cupola , but in modern applications, it is more often melted in electric induction furnaces or electric arc furnaces. After melting is complete, the molten cast iron is poured into a holding furnace or ladle. Cast iron's properties are changed by adding various alloying elements, or alloyants . Next to carbon , silicon is the most important alloyant because it forces carbon out of solution. A low percentage of silicon allows carbon to remain in solution, forming iron carbide and producing white cast iron. A high percentage of silicon forces carbon out of solution, forming graphite and producing grey cast iron. Other alloying agents, manganese , chromium , molybdenum , titanium , and vanadium counteract silicon, and promote
315-464: A 10-tonne impeller) to be sand cast, as the chromium reduces cooling rate required to produce carbides through the greater thicknesses of material. Chromium also produces carbides with impressive abrasion resistance. These high-chromium alloys attribute their superior hardness to the presence of chromium carbides. The main form of these carbides are the eutectic or primary M 7 C 3 carbides, where "M" represents iron or chromium and can vary depending on
420-657: A U-shaped dried mud or brick enclosure with the opening in the front for fuel and air, sometimes with a second smaller hole at the rear. The earliest recorded stove was created in Alsace, France in 1490. It was entirely made out of brick and tile, including the flue pipe . In similar times, the Ancient Egyptian , Jewish and Roman people used stone and brick ovens, fueled with wood, in order to make bread and other culinary staples. These designs did not differ extremely from modern-day pizza ovens. Later Scandinavian stoves featured
525-683: A bill that would ban the sale of disposable, single-use propane cylinders in California, is set to be presented for approval to Governor Gavin Newsom . If signed into law, the ban would take effect in January 2023 and would be the first of its kind in the United States. SB 1256 aims to phase out the cylinders completely by 2028; the state Assembly and Senate both approved the legislation. Propane stoves are widely used by campers for cooking, lighting, and heating, and
630-751: A catalytic converter, which causes combustion of the gas and smoke particles not previously burned. Other models use a design that includes firebox insulation, a large baffle to produce a longer, hotter gas flow path. Modern enclosed stoves are often built with a window to let out some light and to enable the user to view progress of the fire. While enclosed stoves are typically more efficient and controllable than open fires, there are exceptions. The type of water-heating " back boiler " open fires commonly used in Ireland, for instance, can achieve more than 80% absolute efficiency. Masonry heaters were developed from Neolithic times to control air flow in stoves. A masonry heater
735-405: A chimney of a meter or more length. These stoves are used most often to heat buildings in winter. Wood or other fuel is put into the stove, lit, and then air flow is regulated to control the burn. The intake airflow is either at the level where fuel is added, or below it. The exhaust (smoke) from the stove is usually several meters above the combustion chamber. Most modern air-tight stoves feature
840-454: A damper at the stove's outlet that can be closed to force the exhaust through an after burner at the top of the stove, a heated chamber in which the combustion process continues. Some air-tight stoves feature a catalytic converter , a platinum grid placed at the stove outlet to burn remaining fuel that has not been combusted, as gases burn at a much lower temperature in the presence of platinum. Using an air-tight stove initially requires leaving
945-424: A grate to burn wood and had sliding doors to control the draught, or flow of air, through it. Because of its compact size, the stove could be housed in a large fireplace or used free-standing in the middle of a room by connecting it to a chimney. Developed amid a wood shortage, it required one-quarter the quantity of fuel as a regular fireplace and could raise the room temperature more quickly. Throughout North America,
1050-408: A long, hollow iron chimney with iron baffles constructed to extend the passage of the leaving gases and extract maximum heat. Russian versions are still frequently used today in northern nations, as they hold six thick-walled stone flues. This design is frequently positioned at the intersection of internal partition walls, with a piece of the stove and flue inside each of four rooms; a fire is kept until
1155-404: A million and a half people die each year from indoor smoke inhalation caused by faulty stoves. An engineer's "Stove Camp" has been hosted annually since 1999 by Aprovecho Research Center (Oregon, US) with the intent of designing a cheap, efficient, and healthy cook stove for use around the world. Other engineering societies (see Envirofit International , Colorado, US) and philanthropic groups (see
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#17328521873441260-631: A passing crack and initiate countless new cracks as the material breaks, and ductile cast iron has spherical graphite "nodules" which stop the crack from further progressing. Carbon (C), ranging from 1.8 to 4 wt%, and silicon (Si), 1–3 wt%, are the main alloying elements of cast iron. Iron alloys with lower carbon content are known as steel . Cast iron tends to be brittle , except for malleable cast irons . With its relatively low melting point, good fluidity, castability , excellent machinability , resistance to deformation and wear resistance , cast irons have become an engineering material with
1365-430: A popular option during the 1800s in the United States because it burned at a high heat while also producing little soot. By 1860, as much as 90% of United States homes used anthracite coal as a solution for the fuel crisis that the United States faced. One major issue with the use of coal burning stoves in the 1800s was limitations of storing the material over time. A division between the wealthy and poor in using coal stoves
1470-500: A potent carcinogen linked to a higher risk of blood cell cancers. Gas-powered stoves are criticized for environmental concerns with methane emission and the usage of natural gas, the danger of carbon monoxide release, and difficulty in cleaning. For example, a January 2022 Stanford-led study reveals that the methane leaking from gas-burning stoves has a climate impact comparable to the carbon dioxide emissions from about 500,000 gasoline-powered cars. Induction stoves were first patented in
1575-430: A principle applied and made popular by Dr. Thomas Reed , which use small pieces of sticks, chips of wood or shavings, leaves, etc., as fuel. The efficiency is very high — up to 50 percent — as compared to traditional stoves that are 5 to 15 percent efficient on average. Stoves fueled by alcohol, such as ethanol, offer another modern, clean-burning stove option. Ethanol-fueled stoves have been made popular through
1680-563: A rule of mixtures. In any case, they offer hardness at the expense of toughness . Since carbide makes up a large fraction of the material, white cast iron could reasonably be classified as a cermet . White iron is too brittle for use in many structural components, but with good hardness and abrasion resistance and relatively low cost, it finds use in such applications as the wear surfaces ( impeller and volute ) of slurry pumps , shell liners and lifter bars in ball mills and autogenous grinding mills , balls and rings in coal pulverisers . It
1785-524: A similar number in Europe. The pellet stove typically uses a feed screw to transfer pellets from a storage hopper to a combustion chamber. Air is provided for the combustion by an electric blower. The ignition is automatic, using a stream of air heated by an electrical element. The rotation speed of the feeder and the fan speeds can be varied to modulate the heat output. Other efficient stoves are based on Top Lit updraft (T-LUD) or wood gas or smoke burner stove ,
1890-424: A spongy steel without the stress concentration effects that flakes of graphite would produce. The carbon percentage present is 3-4% and percentage of silicon is 1.8-2.8%.Tiny amounts of 0.02 to 0.1% magnesium , and only 0.02 to 0.04% cerium added to these alloys slow the growth of graphite precipitates by bonding to the edges of the graphite planes. Along with careful control of other elements and timing, this allows
1995-410: A type of biofuel stove. The shelled dry kernel of corn, also called a corn pellet, creates as much heat as a wood pellet, but generates more ash. "Corn pellet stoves and wood pellet stoves look the same from the outside. Since they are highly efficient, they don't need a chimney; instead, they can be vented outdoors by a four-inch (102 mm) pipe through an outside wall and so can be located in any room in
2100-417: A wide range of applications and are used in pipes , machines and automotive industry parts, such as cylinder heads , cylinder blocks and gearbox cases. Some alloys are resistant to damage by oxidation . In general, cast iron is notoriously difficult to weld . The earliest cast-iron artefacts date to the 5th century BC, and were discovered by archaeologists in what is now Jiangsu , China. Cast iron
2205-399: A year after it was opened. The Dee bridge disaster was caused by excessive loading at the centre of the beam by a passing train, and many similar bridges had to be demolished and rebuilt, often in wrought iron . The bridge had been badly designed, being trussed with wrought iron straps, which were wrongly thought to reinforce the structure. The centres of the beams were put into bending, with
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#17328521873442310-462: Is a class of iron – carbon alloys with a carbon content of more than 2% and silicon content around 1–3%. Its usefulness derives from its relatively low melting temperature. The alloying elements determine the form in which its carbon appears: white cast iron has its carbon combined into an iron carbide named cementite , which is very hard, but brittle, as it allows cracks to pass straight through; grey cast iron has graphite flakes which deflect
2415-438: Is added in the ladle or in the furnace, on the order of 0.5–2.5%, to decrease chill, refine graphite, and increase fluidity. Molybdenum is added on the order of 0.3–1% to increase chill and refine the graphite and pearlite structure; it is often added in conjunction with nickel, copper, and chromium to form high strength irons. Titanium is added as a degasser and deoxidizer, but it also increases fluidity. Vanadium at 0.15–0.5%
2520-439: Is added to cast iron to stabilize cementite, increase hardness, and increase resistance to wear and heat. Zirconium at 0.1–0.3% helps to form graphite, deoxidize, and increase fluidity. In malleable iron melts, bismuth is added at 0.002–0.01% to increase how much silicon can be added. In white iron, boron is added to aid in the production of malleable iron; it also reduces the coarsening effect of bismuth. Grey cast iron
2625-468: Is also known as a stew stove . Near the end of the 18th century, the design was refined by hanging the pots in holes through the top iron plate, thus improving heat efficiency even more. In 1743, Benjamin Franklin invented an all-metal fireplace with an attempt to improve the efficiency. It was still an open-faced fireplace, but improved on efficiency compared to old-fashioned fireplaces. Some stoves use
2730-451: Is because coal stoves are fitted with a grate so allowing part of the combustion air to be admitted below the fire. The proportion of air admitted above/below the fire depends on the type of coal. Brown coal and lignites evolve more combustible gases than say anthracite and so need more air above the fire. The ratio of air above/below the fire must be carefully adjusted to enable complete combustion. Coal, particularly anthracite coal, became
2835-420: Is characterised by its graphitic microstructure, which causes fractures of the material to have a grey appearance. It is the most commonly used cast iron and the most widely used cast material based on weight. Most cast irons have a chemical composition of 2.5–4.0% carbon, 1–3% silicon, and the remainder iron. Grey cast iron has less tensile strength and shock resistance than steel, but its compressive strength
2940-481: Is comparable to low- and medium-carbon steel. These mechanical properties are controlled by the size and shape of the graphite flakes present in the microstructure and can be characterised according to the guidelines given by the ASTM . White cast iron displays white fractured surfaces due to the presence of an iron carbide precipitate called cementite. With a lower silicon content (graphitizing agent) and faster cooling rate,
3045-481: Is continuously evolving. The term "stove" is derived from the Old English word stofa , indicating any individual enclosed space or room; "stove" may sometimes still be used in this sense. Until well into the 19th century, "stove" was defined as a single heated room. Cooking was performed over an open fire since nearly two million years ago. It is uncertain how fires were started at these times; some hypotheses include
3150-404: Is designed to allow complete combustion by burning fuels at full-temperature with no restriction of air inflow. Due to its large thermal mass the captured heat is radiated over long periods of time without the need of constant firing, and the surface temperature is generally not dangerous to touch. Metal stoves came into general use in the 18th century. An early and famous example of a metal stove,
3255-453: Is difficult to cool thick castings fast enough to solidify the melt as white cast iron all the way through. However, rapid cooling can be used to solidify a shell of white cast iron, after which the remainder cools more slowly to form a core of grey cast iron. The resulting casting, called a chilled casting , has the benefits of a hard surface with a somewhat tougher interior. High-chromium white iron alloys allow massive castings (for example,
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3360-414: Is distributed positively, with no heat being lost into the body of a stove. An estimated three million people still cook their food today over open fires. Pottery and other cooking vessels were later placed on open fire; eventually, setting the vessel on a support, such as a base of three stones, resulted in a stove. The three-stone stove is still widely used around the world. In some areas it developed into
3465-595: Is known as the Iron Bridge in Shropshire , England. Cast iron was also used in the construction of buildings . Cast iron is made from pig iron , which is the product of melting iron ore in a blast furnace . Cast iron can be made directly from the molten pig iron or by re-melting pig iron, often along with substantial quantities of iron, steel, limestone, carbon (coke) and taking various steps to remove undesirable contaminants. Phosphorus and sulfur may be burnt out of
3570-640: Is limited to two primary methods, crib wood and cord wood. In 2020, wood stoves tested with crib wood must burn at= 2.0 grams per hour. As of 2020, efficiency tests can also be conducted with cordwood and must be below 2.5 grams of emission per hour. According to the EPA Cordwood discussion paper , these changes are aimed at improving current test methods in order to eventually develop an EPA reference method for cordwood stoves and, potentially, for central heaters (e.g., hydronic heaters/boilers and forced-air furnaces). The burn temperature in modern stoves can increase to
3675-433: Is one of the most common alloying elements, because it refines the pearlite and graphite structures, improves toughness, and evens out hardness differences between section thicknesses. Chromium is added in small amounts to reduce free graphite, produce chill, and because it is a powerful carbide stabilizer; nickel is often added in conjunction. A small amount of tin can be added as a substitute for 0.5% chromium. Copper
3780-539: Is warmed to within operating temperatures, it produces no visible smoke , emitting mostly water and carbon dioxide. Non-catalytic stoves have higher emissions than the new catalytic stoves do when the latter are operated correctly (as of 2003 ). A conventional domestic heating stove in 1984 emitted particulates amounting to approximately 20g per kg of fuel (0.3oz/lb). Research by the United States Environmental Protection Agency (EPA)
3885-602: The Bill & Melinda Gates Foundation , California) continue to research and promote improved cook stove designs. A focus on research and development on improved heating stoves is ongoing and was on display at the 2013 Wood Stove Decathlon in Washington, D.C. Clean-burning stove A clean-burning stove is a stove with reduced toxic and polluting emissions. The term refers to solid-fuel stoves such as wood-burning stoves for either domestic heating, domestic cooking or both. In
3990-682: The Chirk Aqueduct and the Pontcysyllte Aqueduct , both of which remain in use following the recent restorations. The best way of using cast iron for bridge construction was by using arches , so that all the material is in compression. Cast iron, again like masonry, is very strong in compression. Wrought iron, like most other kinds of iron and indeed like most metals in general, is strong in tension, and also tough – resistant to fracturing. The relationship between wrought iron and cast iron, for structural purposes, may be thought of as analogous to
4095-516: The Congo region of the Central African forest, blacksmiths invented sophisticated furnaces capable of high temperatures over 1000 years ago. There are countless examples of welding, soldering, and cast iron created in crucibles and poured into molds. These techniques were employed for the use of composite tools and weapons with cast iron or steel blades and soft, flexible wrought iron interiors. Iron wire
4200-530: The Franklin stove , was allegedly invented by Benjamin Franklin in 1742. It had a labyrinthine path for hot exhaust gases to escape, thus allowing heat to enter the room instead of going up the chimney. The Franklin stove, however, was designed for heating, not for cooking. Benjamin Thompson (1753-1814) at the turn to the 19th century was among the first to present a working metal kitchen stove. His Rumford fireplace of
4305-706: The Gas Museum in Leicester, England , was by a Moravian called Zachaus Winzler in 1802. The switch to gas was prompted by concerns about air pollution, deforestation and climate change, causing the general public to reconsider the usage of coal and wood stoves. Under common-use conditions, indoor NO2 from gas stoves can quickly exceed US Environmental Protection Agency (EPA) and World Health Organization (WHO) 1-h exposure benchmarks in kitchen air. NO2 pollution has been shown to harm human health. The first commercially produced gas stove, invented by Englishman James Sharp, did not enter
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4410-571: The Pither stove were gravity fed and could burn for days. Gas stoves were first introduced by Moravian Zachaus Winzler in 1802. Today, according to the US Energy Information Administration , 35% of American households use gas stoves. They are chosen as they offer better temperature control, durability, low cost, and speed of heating. In June 2023, Stanford researchers found combustion from gas stoves can raise indoor levels of benzene,
4515-531: The Warring States period . This is based on an analysis of the artifact's microstructures. Because cast iron is comparatively brittle, it is not suitable for purposes where a sharp edge or flexibility is required. It is strong under compression, but not under tension. Cast iron was invented in China in the 5th century BC and poured into molds to make ploughshares and pots as well as weapons and pagodas. Although steel
4620-403: The surface tension to form the graphite into spheroidal particles rather than flakes. Due to their lower aspect ratio , the spheroids are relatively short and far from one another, and have a lower cross section vis-a-vis a propagating crack or phonon . They also have blunt boundaries, as opposed to flakes, which alleviates the stress concentration problems found in grey cast iron. In general,
4725-684: The 13th century and other travellers subsequently noted an iron industry in the Alburz Mountains to the south of the Caspian Sea . This is close to the silk route , thus the use of cast-iron technology being derived from China is conceivable. Upon its introduction to the West in the 15th century it was used for cannon and shot . Henry VIII (reigned 1509–1547) initiated the casting of cannon in England. Soon, English iron workers using blast furnaces developed
4830-528: The 1720s and 1730s by a small number of other coke -fired blast furnaces. Application of the steam engine to power blast bellows (indirectly by pumping water to a waterwheel) in Britain, beginning in 1743 and increasing in the 1750s, was a key factor in increasing the production of cast iron, which surged in the following decades. In addition to overcoming the limitation on water power, the steam-pumped-water powered blast gave higher furnace temperatures which allowed
4935-435: The 1790s used one fire to heat several pots that were also hung into holes so that they could be heated from the sides, too. It was even possible to regulate the heat individually for each hole. His stove was designed for large canteen or castle kitchens, though. It would take another 30 years before the technology had been refined and the size of the iron stove been reduced enough for domestic use. Philo Stewart 's Oberlin stove
5040-588: The 25 kHz current. Westinghouse decided to make a few hundred production units to develop the market. Those were named Cool Top 2 (CT2) Induction ranges. The development work was done at the same R&D location by a team led by Bill Moreland and Terry Malarkey. The ranges were priced at $ 1,500 ($ 8,260 in 2017 dollars), including a set of high quality cookware made of Quadraply, a new laminate of stainless steel, carbon steel, aluminum and another layer of stainless steel (outside to inside). Production took place in 1973 through to 1975 and stopped, coincidentally, with
5145-450: The Franklin stove enjoyed widespread adoption, warming farmhouses, city residences, and frontier huts. In 1795, Count Rumford created a particularly popular version, featuring a single fire source, but allowing for the temperature to be adjusted independently for numerous pots at once, all while heating the space. Its main disadvantage was that it was too large for most residential kitchens. Isaac Orr of Philadelphia, Pennsylvania, created
5250-488: The alloy's composition. The eutectic carbides form as bundles of hollow hexagonal rods and grow perpendicular to the hexagonal basal plane. The hardness of these carbides are within the range of 1500-1800HV. Malleable iron starts as a white iron casting that is then heat treated for a day or two at about 950 °C (1,740 °F) and then cooled over a day or two. As a result, the carbon in iron carbide transforms into graphite and ferrite plus carbon. The slow process allows
5355-707: The appliance consists of a solid metal (usually cast iron or steel ) closed firebox, often lined by fire brick , and one or more air controls (which can be manually or automatically operated depending upon the stove). The first wood-burning stove was patented in Strasbourg in 1557, two centuries before the Industrial Revolution , which would make iron an inexpensive and common material, so such stoves were high end consumer items and only gradually spread in use. Wood-burning stoves are still commonly used today in less-developed countries. The most common stove for heating in
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#17328521873445460-429: The benefit of what is called precipitation hardening (as in some steels, where much smaller cementite precipitates might inhibit [plastic deformation] by impeding the movement of dislocations through the pure iron ferrite matrix). Rather, they increase the bulk hardness of the cast iron simply by virtue of their own very high hardness and their substantial volume fraction, such that the bulk hardness can be approximated by
5565-457: The blast furnaces at Coalbrookdale. Other inventions followed, including one patented by Thomas Paine . Cast-iron bridges became commonplace as the Industrial Revolution gathered pace. Thomas Telford adopted the material for his bridge upstream at Buildwas , and then for Longdon-on-Tern Aqueduct , a canal trough aqueduct at Longdon-on-Tern on the Shrewsbury Canal . It was followed by
5670-531: The bolt holes were also cast and not drilled. Thus, because of casting's draft angle, the tension from the tie bars was placed on the hole's edge rather than being spread over the length of the hole. The replacement bridge was built in wrought iron and steel. Further bridge collapses occurred, however, culminating in the Norwood Junction rail accident of 1891. Thousands of cast-iron rail underbridges were eventually replaced by steel equivalents by 1900 owing to
5775-522: The carbon in white cast iron precipitates out of the melt as the metastable phase cementite , Fe 3 C, rather than graphite. The cementite which precipitates from the melt forms as relatively large particles. As the iron carbide precipitates out, it withdraws carbon from the original melt, moving the mixture toward one that is closer to eutectic , and the remaining phase is the lower iron-carbon austenite (which on cooling might transform to martensite ). These eutectic carbides are much too large to provide
5880-439: The carbon to separate as spheroidal particles as the material solidifies. The properties are similar to malleable iron, but parts can be cast with larger sections. Cast iron and wrought iron can be produced unintentionally when smelting copper using iron ore as a flux. The earliest cast-iron artifacts date to the 5th century BC, and were discovered by archaeologists in what is now modern Luhe County , Jiangsu in China during
5985-413: The chimney. This is largely achieved through causing the maximum amount of material to combust, which results in a net efficiency of 60 to 70%, as contrasted to less than 30% for an open fireplace. Net efficiency is defined as the amount of heat energy transferred to the room compared to the amount contained in the wood, minus any amount central heating must work to compensate for airflow problems. SB 1256,
6090-465: The context of a cooking stove, especially in lower-income countries, such a stove is distinct from a clean-burning-fuel stove, which typically burns clean fuels such as ethanol, biogas , LPG, or kerosene. Studies into clean-burning cooking stoves in lower-income countries have shown that they reduce the emissions of dangerous particulates and carbon monoxide significantly, use less fuel than regular stoves, and result in fewer burn injuries . However,
6195-453: The cooking process and may also contain an oven underneath or to the side that is used for baking . Traditionally these have been fueled by wood; the earliest known example of such was the Castrol stove. More modern versions such as the popular Rayburn range offer a choice between using wood or gas . Stoves are also used for heating purposes. Benjamin Franklin's invention in 1740 popularized
6300-465: The cooktop or fuel used. Compared to simple open fires, enclosed stoves can offer greater efficiency and control. In free air, solid fuels burn at a temperature of only about 240 °C (464 °F), which is too low a temperature for perfect combustion reactions to occur, heat produced through convection is largely lost, smoke particles are evolved without being fully burned and the supply of combustion air cannot be readily controlled. By enclosing
6405-621: The cotton, hemp , or wool being spun. As a result, textile mills had an alarming propensity to burn down. The solution was to build them completely of non-combustible materials, and it was found convenient to provide the building with an iron frame, largely of cast iron, replacing flammable wood. The first such building was at Ditherington in Shrewsbury , Shropshire. Many other warehouses were built using cast-iron columns and beams, although faulty designs, flawed beams or overloading sometimes caused building collapses and structural failures. During
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#17328521873446510-430: The damper and air vents open until a bed of coals has been formed. After that, the damper is closed and the air vent regulated to slow down the burning of the wood. A properly loaded and controlled air-tight stove will burn safely without further attention for eight hours, or longer. These features provide a more complete combustion of wood and elimination of polluting combustion products. It also provides for regulation of
6615-526: The development of steel-framed skyscrapers. Cast iron was also used sometimes for decorative facades, especially in the United States, and the Soho district of New York has numerous examples. It was also used occasionally for complete prefabricated buildings, such as the historic Iron Building in Watervliet, New York . Another important use was in textile mills . The air in the mills contained flammable fibres from
6720-528: The difference between heat to the room and heat lost up the chimney. An early improvement was the fire chamber : the fire was enclosed on three sides by masonry walls and covered by an iron plate. Only in 1735 did the first design that completely enclosed the fire appear: the Castrol stove of the French architect François de Cuvilliés was a masonry construction with several fireholes covered by perforated iron plates. It
6825-556: The early 1900s. Demonstration stoves were shown by the Frigidaire division of General Motors in the mid-1950s on a touring GM showcase in North America. The induction cooker was shown heating a pot of water with a newspaper placed between the stove and the pot, to demonstrate the convenience and safety. This unit, however, was never put into production. Modern implementation in the US dates from
6930-535: The early 1900s. These stoves are praised for their cost-effectiveness, ease of cleaning, options to control low heat, and stable base for many types and sizes of pots and other cooking tools. Critics note that abrasive cleaners can damage induction stoves, that gas has more traditional culinary associations, and that induction stoves are unable to operate during power outages. Unlike gas stoves, induction stoves have no detectable benzene emissions and any benzene emissions could then be attributed to cooking food rather than to
7035-779: The early 1970s, with work done at the Research & Development Center of Westinghouse Electric Corporation at Churchill Borough, near Pittsburgh . That work was first put on public display at the 1971 National Association of Home Builders convention in Houston, Texas, as part of the Westinghouse Consumer Products Division display. The stand-alone single-burner range was named the Cool Top Induction Range. It used paralleled Delco Electronics transistors developed for automotive electronic ignition systems to drive
7140-520: The effects of sulfur, manganese is added, because the two form into manganese sulfide instead of iron sulfide. The manganese sulfide is lighter than the melt, so it tends to float out of the melt and into the slag . The amount of manganese required to neutralize sulfur is 1.7 × sulfur content + 0.3%. If more than this amount of manganese is added, then manganese carbide forms, which increases hardness and chilling , except in grey iron, where up to 1% of manganese increases strength and density. Nickel
7245-588: The emissions some supposedly clean-burning cookstoves produce are still much greater than safe limits, and in several studies in lower income countries they did not appear to be effective at reducing illnesses such as pneumonia induced by breathing polluted air, which may have many sources. Solid fuel stoves designed to be used for domestic heating, those designed to be used for cooking, and those designed for both, can all be described as being clean-burning. In all cases these types of stove are designed to produce lower emissions of particulates and other pollutants than
7350-423: The fire in a chamber and connecting it to a chimney, draft (draught) is generated pulling fresh air through the burning fuel. This causes the temperature of combustion to rise to a point (600 °C or 1,112 °F) where efficient combustion is achieved, the enclosure allows the ingress of air to be regulated and losses by convection are almost eliminated. It also becomes possible, with ingenious design, to direct
7455-414: The first cast-iron stove was constructed. This stove was little more than a cast-iron box with no grates. In 1735, the Castrol stove, or "stew stove", was developed by French designer Francois Cuvilliés. It was the earliest recorded wood-burning stove. Benjamin Franklin designed the "Pennsylvania fireplace" in 1740, which incorporated the fundamental concepts of the heating stove. The Franklin stove used
7560-461: The first circular cast-iron stoves with grates for cooking meals on them roughly five years later. The potbellied stove traces its origins to the early 1800s, inspired by the Franklin stove developed twenty years prior. Jordan A. Mott designed the base-burning stove for burning anthracite coal in 1833. In 1834, Philo Stewart created the Oberlin Stove, a small wood-burning cast-iron stove. It
7665-433: The flow of burned gasses inside the stove such that smoke particles are heated and destroyed. Enclosing a fire also prevents air from being sucked from the room into the chimney . This can represent a significant loss of heat as an open fireplace can pull away many cubic meters of heated air per hour. Efficiency is generally regarded as the maximum heat output of a stove or fire, and is usually referred to by manufacturers as
7770-452: The home." A pellet stove is a type of clean-burning stove that uses small, biological fuel pellets which are renewable and very clean-burning. Home heating using a pellet stove is an alternative currently used throughout the world, with rapid growth in Europe. The pellets are made of renewable material — typically wood sawdust or off-cuts. There are more than half a million homes in North America using pellet stoves for heat, and probably
7875-442: The industrial world for almost a century and a half was the coal stove that burned coal. Coal stoves came in all sizes and shapes and different operating principles. Coal burns at a much higher temperature than wood, and coal stoves must be constructed to resist the high heat levels. A coal stove can burn either wood or coal, but a wood stove might not burn coal unless a grate is supplied. The grate may be removable or an "extra". This
7980-635: The intensity of fire by limiting air flow, and for the fire to create a strong draught or draw up the chimney. This results in highly efficient fuel usage. Air-tight stoves are a more sophisticated version of traditional wood-burning stoves. Many countries legislate to control emissions. Since 2015, the United States Environmental Protection Agency (EPA) Phase III Woodstove Regulations in the United States requiring that all wood stoves being manufactured limit particulate emission to 4.5 grams per hour for stoves with after burners or 2.5 grams per hour for stoves with catalytic converters. Testing wood stove efficiency
8085-526: The lower edge in tension, where cast iron, like masonry , is very weak. Nevertheless, cast iron continued to be used in inappropriate structural ways, until the Tay Rail Bridge disaster of 1879 cast serious doubt on the use of the material. Crucial lugs for holding tie bars and struts in the Tay Bridge had been cast integral with the columns, and they failed in the early stages of the accident. In addition,
8190-498: The market for another three decades. By the end of the century, the stoves became popular because they were easier to control and required less maintenance than wood or coal stoves. Electric stoves became popular not long after the advent of home electricity. One early model was created by Thomas Ahearn , the owner of a Canadian electric company, whose marketing included a demonstration meal prepared entirely with electricity at Ottawa's Windsor Hotel in 1892. As central heating became
8295-406: The molten iron, but this also burns out the carbon, which must be replaced. Depending on the application, carbon and silicon content are adjusted to the desired levels, which may be anywhere from 2–3.5% and 1–3%, respectively. If desired, other elements are then added to the melt before the final form is produced by casting . Cast iron is sometimes melted in a special type of blast furnace known as
8400-425: The open fires, traditional stoves, or other appliances they replace. They have been proposed for introduction to developing countries , particularly the cooking type in order to improve air quality , and where they replace open fires they have other advantages such as a reduction in accidents due to burn injuries and house fires. A research summary of the development of clean-burning, domestic, heating stoves
8505-422: The point where secondary and complete combustion of the fuel takes place. A properly fired masonry heater has little or no particulate pollution in the exhaust and does not contribute to the buildup of creosote in the heater flues or the chimney. Some stoves achieve as little as 1 to 4 grams of emissions per hour. This is roughly 10% as much smoke than older stoves, and equates to nearly zero visible smoke from
8610-459: The pots were hung were now covered with concentric iron rings on which the pots were placed. Depending on the size of the pot or the heat needed, one could remove the inner rings. Nepalese may cook on a chulo or clay stove . As concerns about air pollution , deforestation , and climate change have increased, new efforts have been made to improve stove design. The largest strides have been made in innovations for biomass-burning stoves, such as
8715-418: The properties of malleable cast iron are more like those of mild steel . There is a limit to how large a part can be cast in malleable iron, as it is made from white cast iron. Developed in 1948, nodular or ductile cast iron has its graphite in the form of very tiny nodules with the graphite in the form of concentric layers forming the nodules. As a result, the properties of ductile cast iron are that of
8820-545: The recycling rate of propane cylinders. The company has also argued that refillable cylinders cost three times as much as single-use cylinders. The search for safer, cleaner stoves remains to many an important if low-profile area of modern technology. Cook stoves in common use around the world, particularly in Third World countries, are considered fire hazards and worse: according to the World Health Organization ,
8925-729: The relationship between wood and stone. Cast-iron beam bridges were used widely by the early railways, such as the Water Street Bridge in 1830 at the Manchester terminus of the Liverpool and Manchester Railway , but problems with its use became all too apparent when a new bridge carrying the Chester and Holyhead Railway across the River Dee in Chester collapsed killing five people in May 1847, less than
9030-495: The removal of burning branches from wildfires, spark generation through hitting rocks, or accidental lighting through the chipping of stone tools. During the Paleolithic era, approximately 200,000 to 40,000 years ago, primitive hearths were constructed, with stones arranged in a circle shape. Human homes centered around these hearths for warmth and food. Open fires were quite effective; most fires are 30% efficient on average, and heat
9135-475: The retention of carbon and the formation of those carbides. Nickel and copper increase strength and machinability, but do not change the amount of graphite formed. Carbon as graphite produces a softer iron, reduces shrinkage, lowers strength, and decreases density. Sulfur , largely a contaminant when present, forms iron sulfide , which prevents the formation of graphite and increases hardness . Sulfur makes molten cast iron viscous, which causes defects. To counter
9240-416: The sale of Westinghouse Consumer Products Division to White Consolidated Industries Inc. Modern-day induction stoves are sold by many manufacturers, including General Electric , LG Corporation , Whirlpool Corporation , IKEA , and Samsung . A kitchen stove, cooker, or cookstove is a kitchen appliance designed for the purpose of cooking food. Kitchen stoves rely on the application of direct heat for
9345-516: The spent gas canisters often pile up on the ground near dumpsters at campgrounds. The bill is sponsored by the California Product Stewardship Council, a nonprofit local government coalition, in an effort to reduce waste and cut down on the pile-ups of canisters. Worthington Industries , a manufacturer of propane cylinders, has objected to the bill on the grounds that it would be disruptive to campers and that it would not improve
9450-415: The standard in the developed world, cooking transitioned to the primary function of stoves in the twentieth century. Iron cooking stoves that used wood, charcoal, or coal tended to radiate much heat, which made the kitchen unbearably hot in the summer. They were superseded in the twentieth century by steel ranges or ovens fueled by natural gas or electricity. The first patents for induction stoves date from
9555-440: The stove and flues are hot, at which point the fire is extinguished and the flues are closed, storing the heat. During Colonial America, beehive-shaped brick ovens were used to bake cakes and other pastries. Temperature control was closely managed by burning the appropriate quantity of wood to ash and then testing by inserting hands inside, adding additional wood, or opening the door to allow cooling. In 1642, at Lynn, Massachusetts,
9660-501: The technique of producing cast-iron cannons, which, while heavier than the prevailing bronze cannons, were much cheaper and enabled England to arm her navy better. Cast-iron pots were made at many English blast furnaces at the time. In 1707, Abraham Darby patented a new method of making pots (and kettles) thinner and hence cheaper than those made by traditional methods. This meant that his Coalbrookdale furnaces became dominant as suppliers of pots, an activity in which they were joined in
9765-556: The use of higher lime ratios, enabling the conversion from charcoal (supplies of wood for which were inadequate) to coke. The ironmasters of the Weald continued producing cast irons until the 1760s, and armament was one of the main uses of irons after the Restoration . The use of cast iron for structural purposes began in the late 1770s, when Abraham Darby III built The Iron Bridge , although short beams had already been used, such as in
9870-518: The widespread concern about cast iron under bridges on the rail network in Britain. Cast-iron columns , pioneered in mill buildings, enabled architects to build multi-storey buildings without the enormously thick walls required for masonry buildings of any height. They also opened up floor spaces in factories, and sight lines in churches and auditoriums. By the mid 19th century, cast iron columns were common in warehouse and industrial buildings, combined with wrought or cast iron beams, eventually leading to
9975-482: The widespread usage of modern heating stoves and fireplaces. Today, wood stoves are commonly used for warming homes, and are credited for their cost-effectiveness compared to coal and gas, and connection to the practices of human ancestors. A wood-burning stove (or wood burner or log burner in the UK) is a heating or cooking appliance capable of burning wood fuel and wood-derived biomass fuel, such as sawdust bricks. Generally
10080-713: The wood-burning stoves used in many of the world's most populous countries. These new designs address the fundamental problem that wood and other biomass fires inefficiently consume large amounts of fuel to produce relatively small amounts of heat, while producing fumes that cause significant indoor and environmental pollutants. The World Health Organization has documented the significant number of deaths caused by smoke from home fires. Increases in efficiency allow users of stoves to spend less time gathering wood or other fuels, suffer less emphysema and other lung diseases prevalent in smoke-filled homes, while reducing deforestation and air pollution. Corn and pellet stoves and furnaces are
10185-583: The work of Project Gaia in Africa, Latin America and the Caribbean. An air-tight stove is a wood-burning stove designed to burn solid fuel, traditionally wood, in a controlled fashion so as to provide for efficient and controlled fuel use, and the benefits of stable heating or cooking temperatures. They are made of sheet metal, consisting of a drum-like combustion chamber with airflow openings that can be open and shut, and
10290-518: Was a compact metal kitchen stove that was far more efficient than cooking in a fireplace due to its improved heating capacity and allowance for record cooking durations. It was a major commercial success because it could be formed into desired shapes and forms and could survive temperature fluctuations from hot to cold readily. These iron stoves evolved into specialized cooking machines with chimney flue pipes, oven openings, and water heating systems. The earliest reported use of gas for cooking, according to
10395-449: Was a much more compact, wood-burning cast-iron stove, patented in the United States in 1834. It became a huge commercial success, with some 90,000 units sold in the next 30 years. In Europe, similar designs also appeared in the 1830s. In the following years, these iron stoves evolved into specialised cooking-appliances with flue pipes connected to the chimney, oven holes, and installations for heating water. The originally open holes into which
10500-457: Was also produced. Numerous testimonies were made by early European missionaries of the Luba people pouring cast iron into molds to make hoes. These technological innovations were accomplished without the invention of the blast furnace which was the prerequisite for the deployment of such innovations in Europe and Asia. The technology of cast iron was transferred to the West from China. Al-Qazvini in
10605-410: Was more desirable, cast iron was cheaper and thus was more commonly used for implements in ancient China, while wrought iron or steel was used for weapons. The Chinese developed a method of annealing cast iron by keeping hot castings in an oxidizing atmosphere for a week or longer in order to burn off some carbon near the surface in order to keep the surface layer from being too brittle. Deep within
10710-404: Was published in 1982 by Flow Research Inc . Such stoves introduced in the 1980s burnt wood pellets rather than logs. By 1986, a directory was available listing 75 such stoves which had satisfied U.S. emission testing. Clean-burning stoves can be catalytic (using catalytic converters ) or noncatalytic. The noncatalytic designs recirculate smoke to achieve fuller combustion. Once the stove
10815-487: Was reported in 1986 to show that conditions such as asthma , bronchitis and emphysema may be aggravated by the use of conventional heating stoves. The EPA was reported as announcing plans in 1987 to encourage manufacturers to design heating stoves with reduced emissions. Clean-burning stoves are authorised for use in smoke control areas in some countries by organisations such as the EPA. Cast iron Cast iron
10920-401: Was that many poor families could not afford to store the volumes of coal needed to heat homes for long periods of time. Therefore, while wealthy families could store large amounts of coal in cellars, poorer families often had to purchase coal in smaller quantities. Therefore, difficulties surrounding the storage of coal helped push the use and development of gas stoves. Anthracite stoves such as
11025-511: Was used in ancient China to mass-produce weaponry for warfare, as well as agriculture and architecture. During the 15th century AD, cast iron became utilized for cannons and shot in Burgundy , France, and in England during the Reformation . The amounts of cast iron used for cannons required large-scale production. The first cast-iron bridge was built during the 1770s by Abraham Darby III , and
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