[1] Yang Weibo, Chen Zhenqian, Shi Mingheng, et al. Alternate operation characteristicsof a solar-ground source heat pump system [J]. Journal of Southeast University (English Edition), 2010, 26 (2): 327-332. [doi:10.3969/j.issn.1003-7985.2010.02.041]

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Alternate operation characteristicsof a solar-ground source heat pump system()

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

Volumn:

26

Issue:

2010 2

Page:

327-332

Research Field:

Energy and Power Engineering

Publishing date:

2010-06-30

Info

Title:

Alternate operation characteristicsof a solar-ground source heat pump system

Author(s):

Yang Weibo¹;  3;  Chen Zhenqian¹;  2;  Shi Mingheng¹

¹School of Energy and Environment, Southeast University, Nanjing 210096, China
²International Institute for Urban Systems Engineering, Southeast University, Nanjing 210096, China
³School of Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China

Keywords:

solar-ground source heat pump;  alternate operation characteristics;  numerical simulation;  experimental validation

PACS:

TU83

DOI:

10.3969/j.issn.1003-7985.2010.02.041

Abstract:

In order to investigate the alternate operation characteristics of a solar-ground source heat pump system(SGSHPS), various alternate operation modes are put forward and defined.A two-dimensional mathematical model with freezing/melting phase changes is developed for the heat transfer analysis of the soil.Based on the numerical solution of the model, the variation trends of underground soil temperature of the SGSHPS operated in various alternate operation modes are discussed.The results indicate that, for the day-night and short-time interval alternate operation modes without solar energy, the operation time fraction of a solar heat source should be confined to from 50% to 58% when operated in an alternate period of 24 h.Meanwhile, the disadvantages of a natural resumption of soil temperature can be overcome effectively by solar energy filling, and an optimal operation effect can be achieved by integrating the mode of solar energy filling with other alternate modes.In addition, the accuracy of the presented model is verified by the experimental data of borehole wall temperatures.The conclusions can provide a reference for the optimization operation of the SGSHPS.

References:

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[2] Yavuzturk C, Spitler J D, Ree S J.A short time step response factor model for vertical ground loop heat exchangers[J].ASHRAE Transactions, 1999, 105(2):475-485.
[3] Yang Weibo, Shi Mingheng, Chen Zhenqian.Study on the freezing characteristics of soil surrounding the ground heat exchanger of ground coupled heat pump[C]//Proceedings of the 22nd International Congress of Refrigeration.Beijing, 2007:147-153.
[4] Han Zongwei, Zheng Maoyu, Kong Fanhong, et al.Numerical simulation of solar assisted ground-source heat pump heating system with latent heat energy storage in severely cold area[J].Applied Thermal Engineering, 2008, 28(18):1427-1436.
[5] Yang Weibo, Shi Mingheng, Dong Hua.Numerical simulation of the performance of a solar-earth source heat pump system [J].Applied Thermal Engineering, 2006, 26(18):2367-2376.
[6] Gu Y, O’Neal D L.Development of an equivalent diameter expression for vertical U-tubes used in ground-coupled heat pumps[J].ASHRAE Transactions, 1998, 104(2):347-355.
[7] Editing Group of HV&AC Design Guide for Underground Architecture.HV& AC design guide for underground architecture[M].Beijing:China Architecture and Building Press, 1983.(in Chinese)
[8] Bonacina C, Comini G, Fasano A.Numerical solution of phase-change problems[J].Int J Heat Mass Transfer, 1973, 16(2):1825-1832.
[9] Rabin Y, Korin E.An efficient numerical solution for the multidimensional solidification(or melting)problem[J].Int J Heat Mass Transfer, 1993, 36(3):673-683.
[10] Patankar S V.Numerical heat transfer and fluid flow[M].New York:Mc-Graw-Hill, 1980.
[11] Yang Weibo.Theoretical and experimental study on solar-ground source heat pump system [D].Nanjing:School of Energy and Environment of Southeast University, 2007.(in Chinese)

Memo

Memo:

Biography: Yang Weibo(1975—), male, doctor, associate professor, yangwb2004@163.com.
Foundation items: The National Key Technology R& D Program of China during the 11th Five-Year Plan Period(No.2008BAJ12B04), China Postdoctoral Science Foundation(No.20090461050), the Project of Research and Development of Ministry of Housing and Urban-Rural Development of China(No.2008-K1-26), the New Century Talent Project of Yangzhou University for Excellent Young Backbone Teacher(2008).
Citation: Yang Weibo, Chen Zhenqian, Shi Mingheng.Alternate operation characteristics of a solar-ground source heat pump system[J].Journal of Southeast University(English Edition), 2010, 26(2):327-332.

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