EXERGY ANALYSIS OF TWO-STAGE WATER TO WATER HEAT PUMP

Abstract

The paper presents an exergy analysis of the selected two-stage compression water to water heat pump system in heating mode of operation. The foreseen heat source is underground water of constant temperature level. The characteristic exergy values are calculated for the ambient temperature 0 [oC] and ambient pressure 100 kPa. In addition, values of exergy losses, exergy efficiency, exergy loss ratio, exergy loss coefficient and exergy effectiveness (degree of thermodynamic ideality) are also calculated and analyzed. The objective to indicate components and working conditions with increased exergy losses was fulfilled and the obtained results should provide guidance for design and optimization of heat pumps that operate with underground water and are used for water heating applications.