23 September 2011

AN ABSORPTION / COMPRESSION HYBRID SYSTEM FOR HIGH TEMPERATURE HEAT PUMP


Recently, also at the temperature level above 100°C, there are great demands of heat pumps in order to reuse heat that is often exhausted. In this study, absorption/compression hybrid cycle was studied based on the chart analysis. Water is supposed as a
main refrigerant and glycerol as an absorbent. The hybrid system is composed of the same components of conventional compression system, which are a compressor, a condenser, an expansion valve and an evaporator. And to have to have high temperature lift, internal heat exchanger is added to the system. In the analysis, ideal condition was assumed; two-phase compression can be possible and
that there is no pressure drop and heat leak at heat exchangers. The analysis showed that moderate COP could be obtained by the hybrid system at lowpressure ratios without excess super heat of the gas discharged by the compressor.