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Figure 5: Thermodynamic cycle of a basic adsorption pump (Demir et al., 2008) An adsorption heat pump cycle consists of four steps (Figure 5): • Isosteric heating (a–b): The valves between the adsorbent bed and the condenser and evaporator are closed. The temperature of adsorbent bed is increased from Ta to Tb by heating the adsorbent bed without desorption. • Isobaric desorption (b–c): After the isosteric heating of adsorbent bed, the heating process is continued. The valve between the adsorbent bed and condenser is opened. Desorption process is started and water vapour is condensed in the condenser. The pressure of the cycle remains constant and part of the heat which is transferred to the adsorbent bed increases the temperature of adsorbate– adsorbent pair and adsorbent bed while the other part causes the desorption process; • Isosteric cooling (c– d): The valve between the condenser and adsorbent bed is closed and the temperature of adsorbent bed (Tc), which is the maximum temperature of the cycle, is decreased to Td. During this process, both the pressure and temperature of the adsorbent bed are decreased to the evaporator values; • Isobaric adsorption (d– a): The valve between the adsorbent bed and evaporator is opened and vaporization of the adsorbate in the evaporator is started. During adsorbing of the adsorbate in the adsorbent, heat is released due to heat of adsorption. This generated heat should be removed from the adsorbent bed and the temperature of adsorbate–adsorbent pair and container should be decreased to Ta. The cooling effect in the cycle occurs during the isobaric adsorption process (d–a) when the adsorbate is evaporated by gaining heat from environment. The heating effect appears during the isobaric desorption process (b–c) when the adsorbate is condensed by releasing heat to surroundings. In addition to the isobaric desorption process, the adsorbent bed is also cooled during c–d and d–a processes. The heat released during these processes can also be utilised for heating purposes in any process (Gui et al, 2002). Hence, the cooling and heating COP of a basic adsorption heat pump can be determined as: Qe Qab +Qbc COP = cooling 20PDF Image | EPSRC Thermal Management of Industrial Processes
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