Performance study of underground thermal storage in a solar-ground coupled heat pump system for residential buildings

Abstract This paper is performed to analyze the performance of underground thermal storage in a solar-ground coupled heat pump system (SGCHPS) for residential building. Based on the experimental results, the system performance during a longer period is simulated by the unit modeling, and its parametric effects are discussed. The results show that the performance of underground thermal storage of SGCHPS depends strongly on the intensity of solar radiation and the matching between the water tank volume and the area of solar collectors. Compared with the solar radiation, the variations of the water tank temperature and the ground temperature rise lag behind and keep several peaks during the day time. For the case of Tianjin, the efficiency of underground thermal storage based on the total solar radiation and absorbed solar energy by the collectors can reach over 40% and 70%, respectively. It is suggested that the reasonable ratio between the tank volume and the area of solar collectors should be in the range of 20–40 L/m2.

[1]  A. C. de Geus,et al.  Large solar heating system with seasonal storage for buld drying in Lisse, the Netherlands , 1996 .

[2]  Janusz Wojtkowiak,et al.  Measurements of temperature distribution in ground , 2001 .

[3]  H Wang,et al.  Numerical study on the ground temperature field around large-area compact U-shaped pile-buried heat exchangers. , 2006 .

[4]  A. Hepbasli,et al.  Performance analysis of a solar-assisted ground-source heat pump system for greenhouse heating: an experimental study , 2005 .

[5]  Natale Arcuri,et al.  Prototype experimental plant for the interseasonal storage of solar energy for the winter heating of buildings: Description of plant and its functions , 1995 .

[6]  Viorel Badescu.  Optimal control of flow in solar collector systems with fully mixed water storage tanks , 2008 .

[7]  John L. Wright,et al.  Single- and multi-tank energy storage for solar heating systems: fundamentals , 2002 .

[8]  Hua Dong,et al.  Numerical simulation of the performance of a solar-earth source heat pump system , 2006 .

[9]  Erik Gabrielsson.  Seasonal Storage of Thermal Energy—Swedish Experience , 1988 .

[10]  V. C. Mei,et al.  New approach for analysis of ground-coil design for applied heat pump systems , 1985 .

[11]  Onder Ozgener,et al.  Experimental performance analysis of a solar assisted ground-source heat pump greenhouse heating system , 2005 .

[12]  Simon J. Rees,et al.  A transient two-dimensional finite volume model for the simulation of vertical U-tube ground heat exchangers , 1999 .

[13]  Jeffrey D. Spitler,et al.  A short time step response factor model for vertical ground loop heat exchangers , 1999 .

[14]  Recep Yumrutaş,et al.  Analysis of solar aided heat pump systems with seasonal thermal energy storage in surface tanks , 2000 .

[15]  Per Eskilson.  Thermal analysis of heat extraction boreholes , 1987 .

[16]  Viorel Badescu,et al.  Renewable energy for passive house heating: II. Model , 2003 .

[17]  Bernard Souyri,et al.  Coupling of geothermal heat pumps with thermal solar collectors , 2007 .

[18]  Louis Lamarche,et al.  A new contribution to the finite line-source model for geothermal boreholes , 2007 .

[19]  J. Sunderland,et al.  Thermal energy storage in the ground: Comparative analysis of heat transfer modeling using U-tubes and boreholes , 1996 .

[20]  Natale Arcuri,et al.  Effect of climatic variability on the performance of solar plants with interseasonal storage , 2000 .

[21]  E. Hahne,et al.  Experience with a Solar Heating ATES System for a University Building , 1994 .