Exergy Study of the Reverse Cycles of Absorption Heat Pumps by Use of Energy-Utilization Diagrams

Abstract

Energy utilization diagrams (EUDs) are applied to the design of reverse-type absorption chillers. They represent the distribution of both the exergy loss and the driving force in each part of the system. It is shown that the performance of the reverse cycle is quite high. in particular, installation of an auxiliary heat exchanger is expected to raise the efficiency much higher. The procedure for improving the process system by examining the displayed EUDs shows that EUDs are quite effective in designing process systems. Since only information of enthalpy and entropy is required, EUDs can be drawn in an early stage of system design and may become a powerful tool for technology assessment.