The Combined Solar with a Dual Heat Source Heat Pump Applied in a Greenhouse Heating System - An Operation Optimization of Water Source Heat Pump

Abstract:

Based on the finite-time thermodynamic theory, an operation optimization, of water source heat pump in the combined solar with a dual heat source heat pump which is applied in a greenhouse heating system, is made. According to the ε-NTU method and entropy theory, heat exchange and balance equations are obtained. The function relationship between COP and the indoor temperature T_n, the ambient temperature T_a, low temperature heat source inlet temperature T_ie and high temperature heat source inlet temperature T_ic is also obtained. By means of programming, the impact of parameters on the COP and the way of regulating this water source heat pump system are presented in this article. The results show that: when a separate water source heat pump is running, by adjusting the hot water temperature and the match status of each indoor heating system, the energy-saving operation can be realized.

• Periodical: Applied Mechanics and Materials (Volumes 541-542)
• Pages: 942-948
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.541-542.942
• Online since: March 2014
• Authors: Xian Peng Sun*, Zhi Rong Zou, Yue Zhang
• Keywords: COP, Finite-Time Thermodynamics, Greenhouse Heating System, Water Source Heat Pump

References

[1] O. Ozgener, A. Hepbasli, Performance analysis of a solar-assisted ground-source heat pump system for greenhouse heating: an experimental study[J], Building and Environment 40 (2005) 1040–1050.

DOI: 10.1016/j.buildenv.2004.08.030

[2] O. Ozgener, A. Hepbasli, Experimental performance analysis of a solar assisted ground-source heat pump greenhouse heating system[J], Energy and Buildings 37 (2005) 101-110.

DOI: 10.1016/j.enbuild.2004.06.003

[3] O. Ozgener, Use of solar assisted geothermal heat pump and small wind turbine systems for heating agricultural and residential buildings[J], Energy 35 (2010) 262-268.

DOI: 10.1016/j.energy.2009.09.018

[4] O. Ozcan, O. Ozgener. Energetic and exergetic performance analysis of Bethe-Zeldovich-Thompson(BZT) fluids in geothermal heat pumps[J]. International Journal of Refrigeration 34(2011)1943-(1952).

DOI: 10.1016/j.ijrefrig.2011.05.019

[5] Lilong Chai, Chengwei Ma, Ji-Qin Ni, Performance evaluation of ground source heat pump system for greenhouse heating in northern China, Biosystems Engineering 111 (2012) 107–117.

DOI: 10.1016/j.biosystemseng.2011.11.002

[6] Yanxing Hu, Xueling Liu. Economic analysis of the heat pump[J]. Geothermal Energy, 2005(1): 22-24.

[7] Wu Jing-Yi, Jin Ding, Wang Ru-Zhu. Economical analysis of heat pump applied in heating systems of vegetable greenhouses[J]. Journal of engineering thermophysics, 2002(23): 17-19.

[8] Zongwei H, Maoyu Z, Zhongjian L, et al. Thermoeconomic analysis for the solar source heat pump heating system[J]. Acta Energiae Solaris Sinica, 2008, 10: 011.

[9] Wenquan T. Heat Transer[M]. Beijing: Higher Education Press, (2006).

[10] Yuping C, Genming Z. Study of Entropy Analysis on Refrigeration System Working between Variable-temperature Heat Sources[J]. Journal of east china shipbuilding institute, 2002, 06: 013.

[11] Weixing Chen. Research on mode of dual heat source solar energy heat pump[D]. Nanjing: Nanjing university of science and technology, (2004).