Heating and cooling performance characterisation of ground source heat pump system by testing and TRNSYS simulation

In this paper the performance of a ground source heat pump (GSHP) system with horizontal coupled ground loop pipes was monitored, analysed, extrapolated and numerically simulated. The state-of-art facility of the Kortright Centre was used to experimentally monitor the performance of GSHP. The main objective was to develop cooling/heating performance curves based on the building loads and the source temperatures. In addition, it was aimed to evaluate the efficiency of the heat pump at different load/source temperatures and measure the cycling characteristics of the compressor. Furthermore, the heat pump was modelled using the performance curves obtained from the experimental investigation. TRNSYS was used to model the house as well as the heat pump. The model was validated using the daily thermal output and it was determined that the COP ranged from 3.05 (at an ELT of 44.4 °C and an EST of 2.7 °C) to 3.44 (at an ELT of 41.5 °C and an EST of 5.48 °C). The system was also investigated for potential improvements in the control strategies. The aim was to identify issues with the current controls of as installed system and determine methods for possible improvement in the overall efficiency.

[1]  Helen Theodoropoulou,et al.  Public awareness and willingness to adopt ground source heat pumps for domestic heating and cooling , 2014 .

[2]  Jon Hand,et al.  CONTRASTING THE CAPABILITIES OF BUILDING ENERGY PERFORMANCE SIMULATION PROGRAMS , 2008 .

[3]  Pingfang Hu,et al.  Recent research and applications of ground source heat pump integrated with thermal energy storage systems: A review , 2014 .

[4]  Alan S. Fung,et al.  Feasibility of combined solar thermal and ground source heat pump systems in cold climate, Canada , 2013 .

[5]  Euiyoung Kim,et al.  Performance evaluation under the actual operating condition of a vertical ground source heat pump system in a school building , 2012 .

[6]  Stephen P. Kavanaugh,et al.  Ground Source Heat Pumps : Design of Geothermal Systems for Commercial and Institutional Buildings , 1997 .

[7]  Zhihao Chen,et al.  Experimental investigation on the operation performance of a direct expansion ground source heat pump system for space heating , 2013 .

[8]  Katsunori Nagano,et al.  Development of a design and performance prediction tool for the ground source heat pump system , 2006 .

[9]  B. Perers,et al.  Optimization of systems with the combination of ground-source heat pump and solar collectors in dwellings , 2010 .

[10]  Yuanwei Lu,et al.  An experimental study of a direct expansion ground‐coupled heat pump system in heating mode , 2009 .

[11]  Dahai Zhang,et al.  Analysis of Energy Performance of the Sustainable Archetype House at Kortright Centre , 2010 .

[12]  Saffa Riffat,et al.  Ground source heat pump––description and preliminary results of the Eco House system , 2004 .

[13]  Alan S. Fung,et al.  Performance prediction of a hybrid solar ground-source heat pump system , 2012 .

[14]  Yungang Wang,et al.  Modeling the interactions between the performance of ground source heat pumps and soil temperature variations , 2014 .

[15]  Wei Xiang,et al.  Heating and cooling performance analysis of a ground source heat pump system in Southern Germany , 2015 .

[16]  Apostolos Michopoulos,et al.  Three-years operation experience of a ground source heat pump system in Northern Greece , 2007 .