![]() ![]() It is then throttled too the evaporator pressure and vaporizes as it absorbs heat from the refrigerated space. The most widely used refrigeration cycle is the vapor-compression refrigeration cycle, the refrigerant enters the compressor as saturated vapor and is cooled to the saturated liquid state in the condenser. Ideal Vapor-Compression Refrigeration Cycle Isothermal heat transfer from cold medium to refrigerant Also, since it is a reversible cycle, all four processes can be reversed. It has the maximum efficiency for a given temperature limit. A refrigerator or heat pump that operates on the reversed Carnot cycle is called a Carnot Refrigerator. Reversing the Carnot cycle does reverse the directions of heat and work interactions. Actual Vapor-Compression Refrigeration Cycle.Ideal Vapor-Compression Refrigeration Cycle.The most important refrigeration cycles are: There are different refrigeration cycles, but all of them has four main components:Īlthough all cycle has the same elements, there are different refrigeration cycles. Refrigerators and heat pumps are essentially the same device they only differ in their objectives. Thermodynamics refrigeration cycles are the conceptual and mathematical models for refrigerators. Furthermore, the initial cost of a heat pump is greater than that of many furnaces, so that a heat pump must last longer for its cost to be recovered.Refrigerators are devices that that will transfer heat from a low temperature environment to a high temperature environment. Heat transfer occurs from a cold reservoir\boldsymbolis usually supplied by electrical energy that costs more per joule than heat transfer by burning fuels like natural gas. We say backward, rather than reverse, because except for Carnot engines, all heat engines, though they can be run backward, cannot truly be reversed. Heat pumps, air conditioners, and refrigerators utilize heat transfer from cold to hot. Most people don’t realize they are also sharing their homes with a heat pump. Almost every home contains a refrigerator. ![]() Calculate a heat pump’s coefficient of performance.įigure 1.Explain the differences between heat pumps and refrigerators.Demonstrate how a heat pump works to warm an interior space.Describe the use of heat engines in heat pumps and refrigerators. ![]()
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