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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Another difference between the two types is the refrigerant used.
Conjugate variables in italics Property diagrams Intensive and extensive properties. The lower pressure in the evaporator section allows the liquid refrigerant to evaporate, which absorbs heat from the refrigerator food compartment. The company marketed refrigerators for recreational vehicles RVs under the Dometic brand.
A simple absorption refrigeration system common in large commercial plants uses a solution of lithium bromide and lithium chloride salt and water. In this heat exchangerthe hot ammonia gas transfers its heat to the outside air, which is below the boiling point of the full-pressure ammonia, and therefore condenses.
In other projects Wikimedia Commons. In both types, when this refrigerant evaporates boilsit takes some heat away with it, providing the cooling effect.
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.
The refrigerator uses three substances: This page was last edited on 26 Novemberat Humidity is removed from the cooled air with another spray of salt solution, providing the outlet of cool, dry air. 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 refrigerstor heat to the compressorrless outside the refrigerator, by being hotter than the outside air.
Retrieved from ” https: 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.
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.
An absorption refrigerator changes the gas back into a liquid using a method that needs only heat, and refrigeratlr no moving parts other than the refrigerant itself.
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Absorption refrigerator – Wikipedia
Maxwell’s thermodynamic surface Entropy as energy dispersal. 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. The salt solution is regenerated by heating it under low pressure, causing water to evaporate. The pure ammonia gas then enters the condenser.
Water under low pressure is evaporated from compreseorless coils that are being chilled. The less humid, warm air is then passed through an evaporative coolercompressorelss of a spray of fresh water, which cools and re-humidifies the air.
Thermodynamics The classical Carnot heat engine. 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. The water evaporated from the salt solution is re-condensed, and rerouted back to the evaporative cooler.
It continues to evaporate, while the large enthalpy compreszorless vaporization heat flows from the warmer refrigerator interior to refrigeraator cooler liquid ammonia and then to more ammonia gas. An absorption refrigerator is a refrigerator that uses a heat source e.
The cycle is closed, with all hydrogen, water and ammonia collected and endlessly reused. From Wikipedia, the free encyclopedia. Material properties Property databases Specific heat capacity.
Another variant, uses air, water, and a salt water solution. The presence of hydrogen lowers the partial pressure of the ammonia gas, thus lowering the evaporation rate of the liquid below the temperature of the refrigerator’s interior.
Views Read Edit View history. Equations Carnot’s rrefrigerator Clausius theorem Fundamental relation Ideal gas law Maxwell relations Onsager reciprocal relations Bridgman’s equations Table of thermodynamic equations.
The principle can also be used to air-condition buildings using the waste heat from a gas turbine or water heater. 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.
The condensed liquid ammonia flows down to be mixed with the hydrogen gas released from the absorption step, repeating the cycle.
Zeroth First Second Third. This “Platen-Munters” design can operate compreesorless a pump. The spray lowers the humidity but does not significantly change the temperature. Laws Zeroth First Second Third.
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The classical Carnot heat engine. In the s, absorption refrigeration saw a renaissance due to the substantial demand for refrigerators for caravans travel trailers. The now-vaporized refrigerant then compeessorless back into the compressor to repeat the cycle.
Archived from the original PDF compressorless Commercial production began in by the newly formed company AB Arcticwhich was bought by Electrolux in Without phase change hot air engines.
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. Conjugate variables in italics. The cooling cycle starts with liquid ammonia at room temperature entering the evaporator.