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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Thermodynamics The classical Carnot heat engine. History General Heat Entropy Gas laws. An absorption refrigerator changes the gas back into a cokpressorless using a method that needs only heat, and has no moving parts other than the refrigerant itself.
Thermodynamic cycles Heat pumps Cooling technology Heating, ventilating, and air conditioning Gas technologies. The company marketed refrigerators for recreational vehicles RVs under the Dometic brand. Humidity is removed from the cooled air with another spray of salt solution, providing the outlet of cool, dry air. Ammonia evaporates, taking a small amount of heat from the liquid and lowering the liquid’s temperature. The less humid, warm air is then passed through an evaporative coolerconsisting of a spray of fresh water, which cools and re-humidifies the air.
Equations Carnot’s theorem Clausius theorem Fundamental relation Ideal gas law Maxwell relations Onsager reciprocal relations Bridgman’s equations Table of thermodynamic equations. In other projects Wikimedia Commons. 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.
Heating, ventilation and air conditioning. The pure ammonia gas then enters the condenser. Archived from the original PDF on The now-vaporized refrigerant then goes back into the compressor to repeat the cycle.
The refriterator cycle starts with liquid ammonia at room temperature entering the evaporator. Heat engines Heat pumps Thermal efficiency.
Retrieved from ” https: Classical Statistical Chemical Quantum thermodynamics. At the TED ConferenceAdam Grosser presented his research of a new, very small, “intermittent absorption” vaccine refrigeration unit for use in third world countries.
The condensed liquid ammonia flows down to be mixed with the hydrogen gas released from the absorption step, repeating the cycle.
The presence of hydrogen lowers the partial pressure of the ammonia gas, thus lowering the evaporation rate cmopressorless the liquid below the temperature of the refrigerator’s interior.
Archived copy as title.
A single-pressure absorption refrigerator takes advantage of the fact that a liquid’s evaporation rate depends upon the partial pressure of the vapor above the liquid and goes down with lower partial pressure. The classical Carnot heat engine. Conjugate variables in italics. In comparison, a compressor refrigerator uses a compressor, usually powered by either an electric or internal combustion motor, to increase erfrigerator pressure on the gaseous refrigerant.
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.
The orifice or throttle valve creates a pressure drop between the high pressure condenser section and the low pressure evaporator section. Carnot’s theorem Clausius theorem Fundamental relation Ideal gas law. Material properties Property databases Specific heat capacity.
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Absorption refrigerator – Wikipedia
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.
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.
The intake of warm, moist air is passed through a refrigerafor solution of salt water. 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.