SET Proceedings 2978-4387 Caravel Press 10.65582/set.2005.095 2005.095 A Study on the Intermittent Temperature Recoverable Process of Ground Source Heat Pump Applications GaoQing LiMing YanY.Y. Department of Thermal Engineering, Jilin University, Changchun, China School of the Built Environment, the University of Nottingham, Nottingham, UK 23092005 4 1 978-7-112-07718-2 429 434 23 September 2005 © 2005 Copyright WSSET 2005

The performance of the ground source heat pump (GSHP) used for earth energy applications in the regions where the climate changes in summer and winter are distinct is studied. The applications of the GSHP in such regions, which take the advantages that the ground source temperature is intermittently recoverable, uses renewable and sustainable energy source and has no CO2 emissions. In the present research, the effects of the intermittence and its recoverable temperature characteristics on the GSHP performance are particularly studied. The operating experiments and numerical predictions are carried out. It is found that the temperature variations in the GSHP are related to intermittent time; the intermittence prolongs the heat transfer between the working fluid and the underground, and also increases the load of heating/cooling processes. An effective control of the intermittent process can optimise the capacity of heat exchange units so as to achieve better application of the earth energy. In addition, the control of intermittent process can decrease the number of ground heat exchangers in the GSHP system to ensure better working conditions.

 ground source heat pump earth energy intermittent process renewable energy 23 to 25 September 2005 4th International Conference on Sustainable Energy Technologies SET2005 4 Jinan, China Cenk Y. and J.D.Spitler, 2001, Field Validation of a Short Time Step Model for vertical Ground-Loop Heat Exchangers, ASHRAE Transactions, 2001, 107(2): 617-625. Deerman J. D., Kavanaugh, S. P., 1991, “Simulation of Vertical U-Tube Ground Coupled Heat Pump Systems Using the Cylindrical Heat Source Solution”. ASHRAE Transactions, 97(1): 287-295. Douglas C., Andrew M. and Christopher J.I., 1998, Operating Experiences with Commercial Ground-Source Heat Pumps, ASHRAE Transactions, 104(2): 677-686. James W.S., 1998, Transient Heat Transfer Approximations for Ground-Source Heat Pump Design, Proceedings of the ASME Advanced Energy Systems Division, 1998, 38:415-424. James W.S., 2000, Intermittent convection heat transfer for ground source heat pump design, Proceedings of the ASME, Advanced Energy Systems Division, 2000, 40:147-153 Li Ming, 2003, Efficiently use ground energy in GSHP and simulation analysis of It’s heat exchange, M.D. Thesis, JiLin University, 2003 Rottmayer, S. P., W. A. Beckman, and J. W. Mitchell, 1997, Simulation of a Single Vertical U-Tube Ground Heat Exchanger in an Infinite Medium. ASHRAE Transactions, 1997, 103(2): 651-658.