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Technology Review of Two-Stage Vapor Compression Heat Pump System
KOJO ATTA AIKINS,이상혁,최종민 대한설비공학회 2013 International Journal Of Air-Conditioning and Refr Vol.21 No.3
There is increasing demand for domestic and industrial refrigeration, space heating and air conditioning. Heat pump systems o®er economical alternatives for recovering heat from di®erent sources for use in these applications. As a renewable energy technology for sustainable environment, the heat pump's high e±ciency and low environmental impact have already drawn a fair amount of attention all over the world. Some of these domestic and industrial applications require very low evaporating temperatures and very high condensing temperatures which induce high compressor pressure ratios beyond the practical range for single-stage heat pump cycles. These high pressure ratios also produce low coe±cient of performance (COP) values and expose the compressor to high discharge temperature, low volumetric e±ciency and damage. However, this challenge can be overcome by adopting two-stage heat pump cycles. In this paper, recent works on two-stage heat pump systems for various applications are reviewed. They include two-stage cycle with intercooling, two-stage cycle with refrigerant injection and two-stage cascade cycle. Research and innovative designs of systems that make use of these two-stage cycles have been able to get heat pumps to handle applications with lower and higher temperatures, while enhancing heating capacity up to 30% and COP up to 31%.