A techno-economic comparison of a direct expansion ground-source and an air-source heat pump system in Canadian cold climates ☆

This study aims to compare two commonly used ASHP (air-source heat pump) and DX-GSHP (direct-expansion ground-source heat pump). There have been many debates on energy efficiency, system costs and relative payback period of DX-GSHP against ASHP systems over the past few years. In this context, and with the aim of enriching this debate, a detailed screening heat pump model previously developed is modified and used to compare the seasonal performance of ASHP vs DX-GSHP in a residential building in the cold climate city of Montreal. Further, a life cycle cost analysis is performed to account for the difference between initial and 10-year operating costs of the two systems based on the current prices in Quebec. The obtained results show that by proper sizing, energy consumption of the DX-GSHP system can be reduced by 50%. Moreover, with current borehole installation prices, the relative payback period of the GSHP (ground source heat pump) compared to ASHP is more than 15 years. However, if the borehole installation price reduced by 50% the payback period would be reduced to just a few years. Such results highlight the importance of further investigations in the area of DX-GSHPs, in order to reduce the borehole installation cost and increase its performance.

[1]  J. Urchueguía,et al.  Comparison between the energy performance of a ground coupled water to water heat pump system and an air to water heat pump system for heating and cooling in typical conditions of the European Mediterranean coast , 2008 .

[2]  Louis Lamarche,et al.  Experimental analysis of a direct expansion geothermal heat pump in heating mode , 2014 .

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

[4]  Yang Hongxing,et al.  Experimental studies on a ground coupled heat pump with solar thermal collectors for space heating , 2011 .

[5]  J. R. Goulburn,et al.  Domestic heat pump with deep hole ground source evaporator , 1983 .

[6]  Mohamed Ouzzane,et al.  Modeling of a two-phase CO2-filled vertical borehole for geothermal heat pump applications , 2014 .

[7]  Wei Yang,et al.  Experimental performance analysis of a direct-expansion ground source heat pump in Xiangtan, China , 2013 .

[8]  Jong Min Choi,et al.  Current status of the performance of GSHP (ground source heat pump) units in the Republic of Korea , 2012 .

[9]  X. Yu,et al.  Year round experimental study on a constant temperature and humidity air-conditioning system driven , 2011 .

[10]  Ryozo Ooka,et al.  Theoretical analysis on ground source heat pump and air source heat pump systems by the concepts of cool and warm exergy , 2014 .

[11]  Martin Kegel,et al.  Assessment of a Solar Assisted Air Source and a Solar Assisted Water Source Heat Pump System in a Canadian Household , 2012 .

[12]  Martin Kegel,et al.  Life Cycle Cost Comparison and Optimisation of Different Heat Pump Systems in the Canadian Climate , 2012 .

[13]  Louis Lamarche,et al.  A fast algorithm for the simulation of GCHP systems , 2007 .

[14]  Ali Hakkaki-Fard,et al.  Applying refrigerant mixtures with thermal glide in cold climate air-source heat pumps , 2014 .

[15]  Hongxing Yang,et al.  Vertical-borehole ground-coupled heat pumps: A review of models and systems , 2010 .

[16]  W. Rohsenow,et al.  Handbook of Heat Transfer , 1998 .

[17]  Apostolos Michopoulos,et al.  Operation characteristics and experience of a ground source heat pump system with a vertical ground heat exchanger , 2013 .

[18]  Wei Shen,et al.  A techno-economic comparison of a direct expansion ground-source and a secondary loop ground-coupled heat pump system for cooling in a residential building , 2012 .

[19]  M. McLinden,et al.  NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP, Version 8.0 , 2007 .

[20]  Ali Hakkaki-Fard,et al.  Improving cold climate air-source heat pump performance with refrigerant mixtures☆ , 2015 .

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

[22]  Kaan Ozbay,et al.  Guidelines for Life Cycle Cost Analysis , 2003 .

[23]  K. Sumathy,et al.  Parametric study on the performance of a direct-expansion geothermal heat pump using carbon dioxide , 2011 .

[24]  Mohamed Ouzzane,et al.  New correlations for the prediction of the undisturbed ground temperature , 2015 .

[25]  Wenming Yang,et al.  Advances in heat pump systems: A review , 2010 .