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• the heating of fluid is continued to desorption temperature by a heating system and then it is fed to adsorber 2 for the isobaric desorption process; • Then, the heat transfer fluid leaving from adsorber 2 is cooled by a cooler to be fed into the adsorber 1; and • a reversible pump is used to change flow direction of heat transfer fluid for the reverse process, when the adsorber 2 is under cooling and adsorber 1 is under heating stage (Chahbani et al, 2002; Pons and Szarzynski, 20003, Szarzynski et al, 1997; Dous and Meunier, 1989). The system of Saha et al (1997) and Hamamoto et al (2005) worked on an advanced two stages adsorption heat pump cycle and improved the thermal wave process by employing two additional adsorbers in cycle, where cooling capacity can be improved by allocating required adsorbent mass between adsorbers. The main advantage of the improved two stages adsorption heat pump is being capable to utilise low temperature solar/waste heat (40–95oC) as driven heat source (Saha et al, 1997 and 2006; Hamamoto et al, 2005; Khan et al, 2005). Figure 11: Working principles of an adsorption heat pump cycle with thermal wave process (Pons and Szarzynski, 2000). 4.3.5.2 Binary working fluid heat pump To operate at moderate evaporation or condensation pressure, Wang and Zhu (2002) have proposed an innovative adsorption heat pump cycle which operates with binary working fluid NH3 and H2O. The differences between the cyclic behaviours of the single and binary working fluid systems are shown in Figure 12. The operation pressure of the water–zeolite system is low and requires high vacuum in the cycle, Figure 12A. However, the NH3–zeolite cycle operates at higher pressure which is 4– 11 times higher than the ambient pressure, Figure 12B. With an appropriate mixing of ammonia and water, a cycle which operates with a pressure close to ambient pressure can be obtained, Figure 12C. This improvement may solve one of the problems of the adsorption heat pump which is working under high vacuum. 46PDF Image | EPSRC Thermal Management of Industrial Processes
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