An absorption refrigerator is a refrigerator that uses a heat source to provide the energy needed to drive the cooling process. The principle can also be used to. Download Citation on ResearchGate | On Jul 30, , Saghar Mehdi and others published Design of Compressor less Solar Powered. design and fabricate a compressor less refrigerator system flywheel. A parametric model of the refrigerator is designed using 3D modeling software CATIA.
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The pure ammonia gas then enters the condenser. Caloric theory Theory of heat Vis viva “living force” Mechanical equivalent refrogerator heat Motive power. The salt solution is regenerated by heating it under low pressure, causing water to evaporate. In Baltzar von Platen and Carl Munterswhile they were still students at the Royal Institute of Technology in StockholmSwedenenhanced the principle with a 3-fluid configuration.
Another difference between the two types is refrigeratpr refrigerant used. The resulting hot, high-pressure gas is condensed to a liquid form by cooling in a heat exchanger “condenser” that is exposed to the external environment usually air in the room. Zeroth First Second Third. The system is pressurized to the pressure where the boiling point of ammonia is higher than the temperature of the condenser coil the coil which transfers heat to the air outside the refrigerator, by being hotter than the outside air.
The cooling cycle starts with liquid ammonia at room temperature entering the evaporator. Heating, ventilation and air conditioning. The classical Carnot heat engine. Commercial production began in by the newly formed company AB Arcticwhich was bought by Electrolux in Thermodynamics The classical Carnot heat engine.
The water evaporated from the salt solution is re-condensed, and rerouted back to the evaporative cooler. Caloric refrigeraor Theory of heat. In other projects Wikimedia Commons.
Absorption refrigerator – Wikipedia
Absorption refrigerators are a popular alternative to regular compressor refrigerators where electricity is unreliable, costly, or unavailable, where noise from the compressor is problematic, compresorless where surplus heat is available e.
The system drives the water off the lithium bromide solution with heat. In the early years of the compresssorless century, the vapor absorption cycle using water-ammonia systems was popular and widely used, but after the development of the vapor compression cycle it lost much of its importance because of its low coefficient of performance about one fifth of that of the vapor compression cycle.
Carnot’s theorem Clausius theorem Fundamental relation Ideal gas law.
The main difference between the two systems is the way the refrigerant is changed from a gas back into a liquid so compressorlless the cycle can repeat. Laws Zeroth First Second Third.
The refrigerator uses three substances: While having the same total pressure throughout the refrigerqtor, the refrigerator maintains a low partial pressure of the refrigerant therefore high evaporation rate in the part of the system that draws heat out of the low-temperature interior of the refrigerator, but maintains the refrigerant at high partial pressure therefore low evaporation rate in the part of the system that expels heat to the ambient-temperature air outside the refrigerator.
Water under low pressure is evaporated from the coils that are being chilled.
Classical Statistical Chemical Quantum thermodynamics. A simple absorption refrigeration system common in large commercial plants uses a solution of lithium bromide and lithium chloride salt and water. Humidity is removed from the cooled air with another spray of salt solution, providing the outlet of cool, dry air.
The principle can also be used to air-condition buildings using the waste heat from a gas turbine or water heater. From Wikipedia, the free encyclopedia. This page was last edited on 26 Novemberat History General Heat Entropy Gas laws.
In comparison, a compressor refrigerator uses a compressor, usually powered by either an electric or internal combustion motor, to increase the pressure on the gaseous refrigerant. Maxwell’s thermodynamic surface Entropy as energy dispersal. The condensed refrigerant, refrigeratr at a temperature near to that of the external environment, then passes through an orifice or a throttle valve into the evaporator section. Ammonia evaporates, taking a small amount of heat from the liquid and lowering the liquid’s temperature.
This “Platen-Munters” design can operate without a pump. The lower pressure in the evaporator section allows the liquid refrigerant to evaporate, which absorbs heat from the refrigerator food compartment. The orifice or throttle valve creates a pressure drop between the high pressure condenser section and the low pressure evaporator section.