Abstract
The heat of low-grade can be used to get cooling and heating simultaneously by using the coupling of two absorption heat pumps (conventional/not conventional). This novel advanced absorption heat pump requires three pressure levels to increase and reduce the temperature of useful heat, where desorption/condensation processes are shared at medium pressure, and the two evaporation/absorption processes are developed at low and high pressure respectively. The aim of this proposal is to study this kind of advanced absorption heat pump (Type III) by using the first and second laws of thermodynamics, to determine the energy and exergy coefficient of performances for the whole system by taking into account three scenarios of heat flux rates for both evaporators. The irreversibility and exergy performances for the main components are determined to improve the exergy coefficient of performance. The understanding of reversible Carnot cycles, and the general relationship of energy coefficient of performances at low, medium, and high temperatures for this proposal are analyzed. This advanced absorption heat pump reaches cooling temperatures from 14 to 20 °C and heating temperatures between 80 and 106 °C using water/lithium bromide as a working solution. The energy coefficient of performance of 0.68 is obtained when the higher thermal load of the cooling evaporator than the heating evaporator.
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