The heating performance of a CO2 heat pump water heater

Changhyun Baek, Eungchan Lee, Hoon Kang, Yong Chan Kim, Honghyun Cho, Sungwook Cho

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, an experimental study on the heating performance of a CO2 heat pump water heater was performed with a variation of operating conditions such as refrigerant charge amount, outdoor temperature, compressor frequency, EEV opening and water mass flow rate. Based on the test results, the optimum charge amount was 1800 g. At the water mass flow rates of 75, 85, and 95 kg/hr, the water heating temperatures were 62, 67, and 74°C and COPs were 2.6, 2.8, and 3.0, respectively. Besides, the water mass flow rate and compressor frequency were varied to maintain the water heating temperature above 60°C with the decrease of outdoor temperature. Thus, the compressor frequency increased beyond 60 Hz and the water mass flow rate was 45 kg/hr at the outdoor temperature of-13°C, 65 kg/hr at-8°C, 75 kg/hr at-3°C, and 85 kg/hr at 2, 7°C. As the outdoor temperature decreased, the COP decreased by 2.5-39.8%.

Original languageEnglish
Title of host publication4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
PublisherNational Taipei University of Technology
Pages311-316
Number of pages6
ISBN (Print)9868509610, 9789868509610
Publication statusPublished - 2009 Jan 1
Event4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009 - Taipei, Taiwan, Province of China
Duration: 2009 May 202009 May 22

Other

Other4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
CountryTaiwan, Province of China
CityTaipei
Period09/5/2009/5/22

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)

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  • Cite this

    Baek, C., Lee, E., Kang, H., Kim, Y. C., Cho, H., & Cho, S. (2009). The heating performance of a CO2 heat pump water heater. In 4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009 (pp. 311-316). National Taipei University of Technology.