Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Performance Evaluation of a Two-Stage Compression Heat Pump System for District Heating

지역난방용 2단 압축 히트펌프 시스템 성능평가

  • Park, Cha-Sik (School of Mechanical Engineering, Hoseo University) ;
  • Cha, Dong-An (Energy System R&D Group, Korea Institute of Industrial Technology) ;
  • Kwon, Oh-Kyung (Energy System R&D Group, Korea Institute of Industrial Technology)
  • 박차식 (호서대학교 기계공학부) ;
  • 차동안 (한국생산기술연구원 에너지시스템연구그룹) ;
  • 권오경 (한국생산기술연구원 에너지시스템연구그룹)
  • Received : 2012.04.10
  • Published : 2012.07.10
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Abstract

The objective of this study is to investigate the performance of a two-stage compression heat pump system for district heating. The experimental setup of heat pump consists of compressor, condenser, evaporator, expansion device, intercooler, flash tank, oil separator and accumulator. The experimental evaluations on the two-stage compression cycle were carried out under various operating conditions which were heat source temperature, the degree of compressor inlet superheat, and intermediate pressure. The temperature ranges of unutilized energy as the heat source were used in the test conditions. As the heat source temperature increased from $10^{\circ}C$ to $30^{\circ}C$, the COP and heating capacity of the heat pump system increased by 22.6% and 45.8%, respectively. The performance of the two-stage heat pump system increased by 5.2% with the variation of the intermediate pressure in the same heat source temperature conditions.

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References

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