Effect of overall thermal conductance with different mass allocation on a two stage adsorption chiller employing re-heat scheme

Abstract

Now a days, adsorption heat pumps receive considerable attention as they are energy savers and environmentally benign. Silica gel/water based adsorption cycles have a distinct advantage in their ability to be driven by heat of near-ambient temperature so that waste heat below 100 °C can be recovered. One interesting feature of refrigeration cycles driven by waste heat is that they do not use primary energy as driving source. In the present dissertation, an analytic investigation of a two-stage adsorption refrigeration chiller using re-heat with different mass allocation is performed to determine the influence of the overall thermal conductance of sorption elements, condenser and evaporator on the chiller performance. Result shows that cycle performance is strongly influenced by the large thermal conductance values and gives optimum result for low value of cooling water temperature. It is also seen that COP shows better result for large value of time cycle.