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An external combustion engine is an engine which burns its fuel to heat a separate working fluid which then in turn performs work. Examples include steam engines and Stirling engines.
External combustion engines are often less compact and less powerful than internal combustion engines, but are sometimes more efficient, and are much less particular about the type of fuel they burn.
Sites listed in this category provide significant scientific content about fuel cell physics and technology. Please submit sites primarily selling products online to the most appropriate category within the Shopping branch as they will not be listed here.
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For more information, please refer to the DMOZ Science FAQ. Businesses aimed primarily at developing and marketing fuel cells are listed in the corresponding Business category.
Fuel cells are clean, efficient devices that react fuels such as hydrogen and methanol via an electrochemical pathway, thereby generating electricity. They have been used for decades in the aerospace applications, and are now rapidly finding use in automotive, residential, and stationary power fields.
Manufacturers and suppliers of heat pumps should submit their sites to Business
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This category is for the scientific and technological aspects of heat pumps.
A heat pump is an apparatus that extracts heat from one area and diverts it to another. It can be used to transfer heat from a reservoir to heat a building. It can also work in reverse mode, extracting heat from the indoors and transferring it outdoors in the same way as an air conditioner functions.
Please submit sites about the automotive industry to the most appropriate category within Business/Automotive. Sites about general manufacturing should be submitted to Industrial Goods and Services.
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Internal combustion (IC) engines are prime movers that use a Carnot cycle. They are heat engines and use a temperature difference to do work. They burn compressed mixtures of air and fuel. IC engines have relatively high power to weight ratios, and are far more autonomous than electric motor prime movers. All prime movers have many uses. IC engines are used for: transport vehicles (motorcycles, automobiles, trains, aircraft, boats/ships), electric generators (mobile, fixed), pumps (mobile, fixed), gas compressors, construction vehicles (cranes, earthmovers, pavers) and equipment (crushers, mixers), agriculture vehicles (tractors, harvesters/combines), gardening vehicles (tractors) and equipment (mowers, chain and rotary saws, tillers, mulchers, chippers, blowers, snow throwers/blowers), recreation vehicles (model aircraft, boating, automobile racing, RVs) and more.
Sites about general manufacturing should be submitted to Industrial Goods and Services or related categories.
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This category is about the scientific and technological aspects of Tesla turbines.
A Tesla turbine is a fascinating device dating from 1910, and thus in the public domain. A Tesla turbines is a bladeless, disk-based, very smooth, exceptionally silent, reasonably efficient prime movers. As can any turbine, it can be used as an internal or external combustion engine.
Sites about general manufacturing should be submitted to Industrial Goods and Services or related categories.
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This category is for the scientific and technological aspects of the thermoelectric effect.
Thermoelectric devices are solid state devices with no moving parts. The combined cooling/heating ability makes them attractive for many electrical energy generation and cooling applications. Thermoelectric materials are also used for niche applications where highly accurate temperature control is required.
The category is intended for devices and research.
Sites about general manufacturing should be submitted to Industrial Goods and Services or related categories.
Please submit sites primarily selling products online to the most appropriate category within the Shopping branch as they will not be listed here.
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Please submit to an appropriate subcategory, if one is available. Otherwise, submit here. Failure to submit to the most specific appropriate category can delay the consideration of your submission.
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This category is about the scientific and technological aspects of the thermophotovoltaics (TPV) effect.
Thermophotovoltaics is the use of the photovoltaic effect to generate electricity from high temperature thermal sources (usually between 700 and 1700 degrees centigrade).
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Last update: Wednesday, October 17, 2007 5:25:20 PM EDT - edit