Study on the Performance of a Ground Source Heat Pump System Assisted by Solar Thermal Storage

A ground source heat pump system (GSHPS) utilizes a relatively stable underground temperature to achieve energy-saving for heating and cooling in buildings. However, continuous long-term operation will reduce the soil temperature in winter, resulting in a decline in system performance. In this research, in order to improve the system performance of a GSHPS, a ground heat pump system integrated with solar thermal storage was developed. This solar-assisted ground heat pump system (SAGHPS) can both maintain the balance of the soil temperature effectively and achieve higher system performance than the conventional system. In this paper, in order to examine the characteristics of the system, a dynamic simulation was conducted under various conditions. The results of our case study provide specific operation data such as heat exchange rate, heat source temperature, and heat pump COP. As a result, the heat pump COP of SAGHPS was 4.7%, 9.3% higher than that of the GSHPS.

[1]  I. Dincer.  Renewable energy and sustainable development: a crucial review , 2000 .

[2]  G. Fraisse,et al.  Experimental study of a ground-coupled heat pump combined with thermal solar collectors , 2006 .

[3]  Ryozo Ooka,et al.  Development of a numerical model to predict heat exchange rates for a ground-source heat pump system , 2008 .

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

[5]  F. Wang,et al.  Numerical simulation of solar assisted ground-source heat pump heating system with latent heat energy storage in severely cold area , 2008 .

[6]  O. Comakli,et al.  Energy analysis of a solar-ground source heat pump system with vertical closed-loop for heating appl , 2011 .

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

[8]  Filippo Busato,et al.  Ground or solar source heat pump systems for space heating: Which is better? Energetic assessment based on a case history , 2015 .

[9]  Daniel Pahud,et al.  DUCT GROUND HEAT STORAGE MODEL FOR TRNSYS (TRNVDST) , 1997 .

[10]  Y. Nam,et al.  Study on the characteristic of heat exchange for vertical geothermal system using the numerical simulation , 2014 .

[11]  Renato Lazzarin,et al.  Dual source heat pump systems: Operation and performance , 2011 .

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

[13]  Filippo Busato,et al.  Multisource heat pump system from design to operation: the case study of a new school building , 2013 .

[14]  Yujin Nam.  Study on the Optimum Design of a Heat Pump System Using Solar and Ground Heat , 2012 .

[15]  Onder Ozgener,et al.  A review on the energy and exergy analysis of solar assisted heat pump systems , 2007 .

[16]  Filippo Busato,et al.  Two years of recorded data for a multisource heat pump system: A performance analysis , 2013 .