[1] Wang Fang, Lian Zhiwei, Fan Xiaowei, et al. Experimental study on characteristicsof transcritical heat pump water heater using refrigerant HFC125 [J]. Journal of Southeast University (English Edition), 2010, 26 (2): 182-186. [doi:10.3969/j.issn.1003-7985.2010.02.008]

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Experimental study on characteristicsof transcritical heat pump water heater using refrigerant HFC125()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

26

Issue:

2010 2

Page:

182-186

Research Field:

Energy and Power Engineering

Publishing date:

2010-06-30

Info

Title:

Experimental study on characteristicsof transcritical heat pump water heater using refrigerant HFC125

Author(s):

Wang Fang¹;  2;  Lian Zhiwei¹;  2;  Fan Xiaowei²;  Wang Fengkun²

¹School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
²School of Energy and Environmental Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China

Keywords:

HFC125;  transcritical cycle;  heat pump water heater;  coefficient of performance(COP)

PACS:

TK172

DOI:

10.3969/j.issn.1003-7985.2010.02.008

Abstract:

To evaluate the performance of heat pumps using refrigerant HFC125, an experimental rig of a DC-inverter heat pump water heater is designed and set up, and the research on the transcritical heat pump water heater is carried out experimentally.It is found that there is a top value of the coefficient of performance(COP)when the system runs at 95 Hz of frequency.The relationships between the COP and compressor frequency, condensation pressure, evaporation pressure, condensation water temperature rise, and discharge temperature are discussed and analyzed at 95 Hz.And the COP of the HFC125 transcritical cycle is also compared with that of a R410 subcritical heat pump under the same conditions.The results indicate that there exists an optimum frequency for a better COP, and the system COP shows an increasing tendency with the decrease in condensation pressure and compressor ratio while the evaporation pressure remains invariant, and the COP decreases rapidly when cooling water temperature rises over 47.5 ℃.Compared with the R410A sub-critical cycle, the COP of HFC125 transcritical cycle significantly increases by 12% on average.

References:

[1] Zhou Xiangjiang, Lian Zhiwei, Ye Xiangjiang, et al.Feasibility analysis of high temperature heat pump using in China[J].Fluid Machinery, 2003, 31(7):55-58.(in Chinese)
[2] Khan Jameel-Ur-Rehman, Zubair Syed M.Design and rating of a two-stage vapor compression refrigeration system[J].Energy, 1998, 23(10):867-878.
[3] White S D, Yarrall M G, Cleland D J, et al.Modeling the performance of a transcritical CO₂ heat pump for high temperature heating[J].International Journal of Refrigeration, 2002, 25(4):479-486.
[4] Ma Y T, Wang J G, Lü C R, et al.Characteristic study of supercritical fluids and supercritical cycles[J].HV& AC, 2002, 32(1):101-104.(in Chinese)
[5] Neks(。overa)P, Rekstad H, Zakeri G R, et al.CO₂-heat pump water heater:characteristics, system design and experimental results[J].International Journal of Refrigeration, 1998, 21(3):172-179.
[6] Zhou Xiangjiang, Lian Zhiwei, Yao Ye.The optimal temperature difference of the high temperature heat pump system[J].Acta Energiae Solaris Sinica, 2004, 25(3):394-398.(in Chinese)
[7] Zhou Xiangjiang, Lian Zhiwei, Yao Ye.An ideal cycle of transcritical heat pump[C]//Proceedings of the 4th International Symposium on Heat, Ventilating and Air Conditioning.Beijing, China, 2003:905-909.
[8] Zhou Xiangjiang, Lian Zhiwei, Li Zhihua, et al.Experimental study on HFC125 critical heat pump[J].Applied Thermal Engineering, 2007, 27(5/6):988-993.
[9] Chen D, Lü C R, Ma Y T, et al.Estimation of the basic properties of new stratospherically safe working fluids and study of geothermal heat pump fluids[J].Journal of Engineering Thermophysics, 1997, 18(4):401-404.(in Chinese)

Memo

Memo:

Biographies: Wang Fang(1976—), male, graduate;Lian Zhiwei(corresponding author), male, doctor, professor, zwlian@sjtu.edu.cn.
Foundation item: The National Natural Science Foundation of China(No.50676059).
Citation: Wang Fang, Lian Zhiwei, Fan Xiaowei, et al.Experimental study on characteristics of transcritical heat pump water heater using refrigerant HFC125[J].Journal of Southeast University(English Edition), 2010, 26(2):182-186.

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