The heating performance of a CO2 heat pump water heater

Changhyun Baek; Eungchan Lee; Hoon Kang; Yongchan Kim; Honghyun Cho; Sungwook Cho

The heating performance of a CO₂ heat pump water heater

Changhyun Baek, Eungchan Lee, Hoon Kang, Yongchan Kim, Honghyun Cho, Sungwook Cho

School of Mechanical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English
Title of host publication	4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
Publisher	National Taipei University of Technology
Pages	311-316
Number of pages	6
ISBN (Print)	9868509610, 9789868509610
Publication status	Published - 2009
Event	4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009 - Taipei, Taiwan, Province of China Duration: 2009 May 20 → 2009 May 22

Publication series

Name	4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009

Other

Other	4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
Country/Territory	Taiwan, Province of China
City	Taipei
Period	09/5/20 → 09/5/22

ASJC Scopus subject areas

Chemical Engineering (miscellaneous)

Cite this

The heating performance of a CO₂ heat pump water heater. / Baek, Changhyun; Lee, Eungchan; Kang, Hoon et al.

4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009. National Taipei University of Technology, 2009. p. 311-316 (4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Baek, C, Lee, E, Kang, H, Kim, Y, 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. 4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009, National Taipei University of Technology, pp. 311-316, 4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009, Taipei, Taiwan, Province of China, 09/5/20.

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