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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While having the same total pressure throughout the system, 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.
Another difference between the two types is the refrigerant used. The volume of the evaporator is greater than the volume of the liquid, with the excess space occupied by a mixture of gaseous ammonia and hydrogen.
Thermodynamic cycles Heat pumps Cooling technology Heating, ventilating, and air conditioning Gas technologies. Humidity is removed from the cooled air with another spray of salt solution, providing the outlet of cool, dry air. Free energy Free entropy. History General Heat Entropy Gas laws.
Equations Carnot’s theorem Clausius theorem Fundamental relation Ideal gas law Maxwell relations Onsager reciprocal relations Bridgman’s equations Table of thermodynamic equations. The company marketed refrigerators for recreational vehicles RVs under the Dometic brand.
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. This “Platen-Munters” design can operate without a pump.
Commercial production began in by the newly formed company AB Arcticwhich was bought by Electrolux in The cooling cycle starts with liquid ammonia at room temperature entering the evaporator. The lower pressure in the evaporator section allows the liquid refrigerant to evaporate, which absorbs heat from the refrigerator food compartment. Absorption refrigerators are a popular alternative to regular compressor refrigerators where electricity is unreliable, costly, or unavailable, where noise from the compressor is problematic, or where surplus heat is available e.
An absorption refrigerator changes the gas back into a liquid using a method that needs only heat, and has no moving parts other than the refrigerant itself. This page was last edited on 26 Novemberat Caloric theory Theory of heat. The spray lowers the humidity but does not significantly change the temperature. The salt solution is regenerated by heating it under low pressure, causing water to evaporate.
Heat engines Heat pumps Thermal efficiency. At the TED ConferenceAdam Grosser presented his research of a new, very small, “intermittent absorption” vaccine refrigeration unit for use in third world countries.
Material properties Property databases Specific heat capacity. Thermodynamics The classical Carnot heat engine. Ammonia evaporates, taking a small amount of heat from compressorlesss liquid and lowering the liquid’s temperature. Carnot’s theorem Clausius theorem Fundamental relation Ideal gas law. In the early years of the twentieth 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.
Laws Zeroth First Second Third. From Wikipedia, the free encyclopedia. Compresaorless theory Theory of heat Vis viva “living force” Mechanical equivalent of heat Motive power.
Classical Statistical Chemical Quantum thermodynamics. Archived copy as title. The intake of warm, moist air is passed through a sprayed solution of salt water. An absorption refrigerator is a refrigerator that uses a heat source e. In the s, absorption refrigeration saw a renaissance due to the substantial demand for refrigerators for caravans travel trailers.
The now-vaporized refrigerant then goes back into coompressorless compressor to repeat the cycle. Water under low pressure is evaporated from the coils that are being chilled.
The refrigerator uses three substances: 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. Conjugate variables in italics Property diagrams Intensive and extensive properties. In both types, when this refrigerant evaporates boilsit takes some heat away with it, providing the cooling effect.
Entropy and time Entropy and life Brownian ratchet Maxwell’s demon Heat death paradox Loschmidt’s paradox Synergetics. Heating, ventilation and air conditioning. The condensed refrigerant, now at a temperature near to that of the external environment, then passes through an orifice or a throttle valve into the evaporator section.
InElectrolux sold most compressorpess its leisure products line to the venture-capital company EQT which created Dometic as a stand-alone company.
Conjugate variables in italics.
Absorption refrigerator – Wikipedia
Views Read Edit View history. The system is pressurized to the compdessorless 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.
In other projects Wikimedia Commons. Another variant, uses air, water, and a salt water solution. The main difference between the two systems is the way the refrigerant is changed from a gas back into a liquid so that the cycle can repeat. The principle can also compresworless used to air-condition buildings using the waste heat from a gas turbine or water heater.
Maxwell’s thermodynamic surface Entropy as energy dispersal.