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3.2.2 Adsorbent heat pumps Figure 4: Heat transfer configuration of ideal adsorption heat pump cycle (Ülkü. 1986) The adsorption heat pump cycle works between three temperature levels whereas a vapour compression cycle works between two temperature levels and also requires mechanical power. The adsorption heat pump cycle can be considered as two separate cycles as seen in Figure 4: • The first cycle is a heat pump (adsorption) in which the working fluid is vaporised in evaporator by taking heat (QL) from the low-level temperature source and releasing (Qa) heat to the first intermediate temperature source. • The second cycle is a heat engine (desorption), which receives heat (Qz) from the high-temperature source and releases heat (Qc) to the second intermediate temperature source. The transfer of heat (Qc) to the second intermediate temperature source occurs during the condensation of working fluid in condenser. • It is assumed that the work obtained in the heat engine is employed to run the heat pump. The temperatures of intermediate sources (Tc and Ta) are generally close to each other. Thus, three temperature levels can be considered for an adsorption heat pump and the ideal coefficient of performance of an adsorption heat pump cycle can be obtained as (Pons and Kodoma, 2000; Kodoma et al, 2000; Spinner et al, 2001): Q 1−TC T COP=L= Z cooling TC T −1 Q 1−TC T QZ L COP=C=1+ Z heating QZ TC T −1 L 19PDF Image | EPSRC Thermal Management of Industrial Processes
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