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Basics of Industrial Heat Pumps 3-38 Heat pump technology The application of absorption cycles for high temperature heat recovery systems calls for the investigation of new working pairs. To qualify as a potential working pair, a mix- ture of two substances has to fulfil stringent requirements with respect to thermody- namic properties, corrosion and safety hazards like toxicity and inflammability. Based on a thermodynamic analysis of an absorption heat pump cycle a systematic search for new working pairs has been required, e. g. investigation of organic com- pounds. Figure 3-3: Absorption 3.2.2.2 Absorption-compression hybrid The hybrid heat pump combines substantial parts of both absorption and compression machines - it utilizes a mixture of absorbent and refrigerant and a compressor as well. An important difference between hybrid and absorption cycle should be noticed - the absorber and desorber in the hybrid heat pump are placed in a reversed order than in the absorption machine, i.e. desorption in the hybrid cycle occurs under low tempera- tures and pressures and absorption under high temperatures and pressures. Figure 3-4: Absorption – compression hybridPDF Image | Industrial Heat Pumps
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