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accomplished in one of two methods. The first method takes advantage of the increased condensing temperature of the working fluid as the pressure is increased. The additional work input is used to compress this vapor, allowing it to be condensed at its higher temperature. This method utilizes mechanical power input and is therefore referred to as a mechanical type heat pump. The second method utilizes chemical reactions to create a temperature change while using the waste heat to separate the chemicals so the process can be repeated. This type of chemical process is known as absorption and operates in an absorption heat pump. Mechanical Type To recover the majority of the waste heat available, it must involve the recovery of energy from low temperature streams. While the exhaust stream contains a large amount of recoverable energy, the uses for such low temperature working fluids can sometimes be difficult to locate. In these situations a heat pump can be used to "upgrade" this energy so that is can be used for applications that require higher temperatures. A heat pump receives the waste heat from the process which is used in an evaporator to vaporize the heat pump working fluid. A compressor is then used to increase the pressure of this working fluid which also increases the condensing temperature. The working fluid is then sent to a condenser which then condenses it at this new, higher temperature. This heat gain is then used in the new heat recovery process stream [43]. This process then repeats itself, and is shown in the following figure. 42PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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