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• One of the adsorbers is preheated with rejection heat of another adsorber which is under the cooling process, using a heat transfer fluid until both adsorbers are at the same temperature (G and H); • Then, one adsorber is heated by the external heat source (GD) while the other one is cooled by the external heat sink (HA) (Szarzynski et al, 1997); • Although each adsorber follows exactly the same cycle as the basic adsorption heat pump cycle, the heat which is supplied to the total system decreases; and • Enhancement of the COP up to 50% (Dous and Meunier, 1989; Meunier, 2002; Szarzynski et al, 1997), by reducing the rate of decrease of heat supplied to the whole system. Dous and Meunier (2002) have proposed an alternative with COP for cooling of 1.06 where the adsorption cycle consists of two cycles: (i) a zeolite–water cycle for high temperature stage; and (ii) an active carbon–methanol cycle for low-temperature stage. The heat transferred to the active carbon–methanol cycle for isosteric heating and isobaric desorption processes is entirely obtained from the zeolite–water cycle. The driving energy for zeolite–water cycle is supplied from an external heat source. Figure 10: Working principles of an adsorption cycle with uniform temperature absorbers (Szarzynski et al, 1997). 4.3.5.2 Thermal wave process The system is also composed of two or more adsorbers, a condenser and an evaporator. The working principle of a thermal wave process is shown in Figure 11 where: • the cycle consists of two adsorbers (1 and 2) where heat is circulated using a heat transfer fluid; • when adsorber 1 is under cooling, the adsorber 2 is under heating process and vice versa; • the heat which is recovered from the adsorbent 1 is transferred to the heat transfer fluid; 45PDF Image | EPSRC Thermal Management of Industrial Processes
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