Experimental Analysis of a Variable Capacity Heat Pump System Focusing on the Compressor and Inverter Loss Behavior
2010 (English)In: Proceeding International Refrigeration and Air Conditioning Conference, Academic Conferences Publishing, 2010Conference paper (Refereed)
Capacity control with variable speed compressors in heat pump systems is one of the techniques having a potentialfor efficiency improvement in heat pump systems. It is anticipated that the compressor and inverter efficiency areinfluenced by changes of the compressor speed. The present experimental study evaluates these losses in a variablespeed heat pump system.The experimental results show that increasing the compressor speed reduces the heat pump COP up to 30%. Theinverter loss increases as the compressor speed is increased, although the inverter loss as the percentage of the totalcompressor power decreases. Increasing the compressor speed increases the pressure ratio from 2.7 to 5.8,increasing the loss due to the pressure ratio mismatch drastically. Finally, the highest total isentropic efficiency ofthe compressor is obtained when the compressor frequency is close to 50Hz.
Place, publisher, year, edition, pages
Academic Conferences Publishing, 2010.
IdentifiersURN: urn:nbn:se:kth:diva-87235OAI: oai:DiVA.org:kth-87235DiVA: diva2:501541
International Refrigeration and Air Conditioning Conference. Purdue, US. July 12-15, 2010
QC 201204182012-02-142012-02-142012-04-18Bibliographically approved