• Title/Summary/Keyword: 2단압축열펌프

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Simulation on the Heating Performance of a 2-Stage Compression Heat Pump System Using River Water (하천수열원을 이용한 2단압축 열펌프의 난방성능 시뮬레이션)

  • Park Chasik;Kim Bohyun;Kim Yongchan;Lee Young Soo;Bang Ki-young
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.17 no.11
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    • pp.1005-1013
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    • 2005
  • The use of river water as a heat source of a heat pump has the advantage in the performance compared to the use of atmospheric air because the temperature variation of river water over the year is relatively small. In this study, the performance of the heat pump system using river water as a heat source was numerically investigated. A simulation model for the 2-stage compression heat pump system was developed with each component model composed of compressors, heat exchangers, a flash tank and electronic expansion devices. The peformance of the heat pump system using river water was improved by $50\%$ compared to that using atmospheric air in winter conditions.

An Experimental Study on the Optimal Intermediate Pressure of a 2-Stage Compression Heat Pump Using River Water (하천수 열원 2단압축 열펌프의 최적 중간압에 관한 실험적 연구)

  • Park, Cha-Sik;Jung, Tae-Hun;Joo, Young-Ju;Kim, Yong-Chan
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.21 no.6
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    • pp.333-339
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    • 2009
  • The objective of this study is to predict optimal intermediate pressure of a 2-stage compression heat pump system using river water. To determine the maximum performance of the 2-stage compression heat pump system, the experimental evaluations on the 2-stage compression cycle were carried out under various operating conditions. Electronic expansion valves were applied to control intermediate pressure and superheat. Based on the experimental data, an empirical correlation for predicting optimal intermediate pressure which considering cycle operating parameters was developed. The present correlation was verified by comparing the predicted data with the measured data. The predictions showed a good agreement with the measured data within a relative deviation of ${\pm}4%$ at various operating conditions.

Simulation on the Optimal Performance and Effective Operating Range of a 2-Stage Compression Heat Pump Using River Water (하천수 열원 이용 2단압축 열펌프의 최적성능 및 효용 운전범위에 관한 시뮬레이션 연구)

  • Jung, Tae-Hun;Park, Cha-Sik;Kim, Yong-Chan
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.20 no.5
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    • pp.295-303
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    • 2008
  • The objectives of this study are to predict actual system performance and effective operating range of the 2-stage compression heat pump system using river water. An electronic expansion valve was applied to the simulation to analyze the effects of operating conditions on the system performance. The developed program was verified by comparing the predictions with the measured data. The results from the present model showed a good agreement with the measured data. In addition, the heat pump simulation was conducted by increasing condenser reservoir inlet temperature to investigate the benefits of the 2-stage compression over the 1-stage compression in the heating mode. The performance of the 2-stage compression cycle was better than that of the 1-stage compression when the inlet temperature of the condenser reservoir was higher than $40^{\circ}C$.

A Study on the Operating Control of a 2-Stage Heat Pump System with Screw Compressors (스크류 2단 압축 열펌프 시스템의 운전 제어 방안에 관한 연구)

  • Kim, Ji-Young;Baik, Young-Jin;Lee, Young-Soo;Ra, Ho-Sang
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.501-505
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    • 2006
  • A preliminary performance test of a 30RT 2-stage screw heat pump was carried out in order to develop a high performance large-scale unutilized energy source heat pump, which will be used in district heating and cooling. Two issues on the system control were investigated in this study, A stable 2-stage heating operation is guaranteed only if the load-side water inlet temperature is over a certain value, to where the 1-stage heating operation should be done first from a cold start. An oil shortage problem in low stage compressor, which depends on the degree of suction superheat, was solved by the proper oil level control scheme.

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