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Analysis of a combined photovoltaic-geothermal gas-fired absorption heat pump system in a Canadian climate

Kummert, M. and Bernier, M. (2008) Analysis of a combined photovoltaic-geothermal gas-fired absorption heat pump system in a Canadian climate. Journal of Building Performance Simulation, 1 (4). pp. 245-256. ISSN 1940-1493

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Abstract

This study examines the technical feasibility of using a geothermal gas-fired absorption heat pump (A-GSHP) for space conditioning and domestic hot water heating in a Canadian climate. The A-GSHP is coupled to a photovoltaic (PV) system with battery storage intended to ensure the full autonomy of the heating, ventilating and air conditioning (HVAC) system from the electric grid. The system is modelled using TRNSYS with standard models and a new performance-based A-GSHP model, which accounts for part-load operation. Results indicate that the coefficient of performance (COP) is equal to 1.12, 0.55 and 1.79 for heating only, cooling only and simultaneous cooling and domestic hot water (DHW) heating, respectively. A 13.5 kWp PV array and a 400 kWh battery storage are necessary to provide the electrical power required to operate the A-GSHP and the associated HVAC system at all times without importing electrical energy from the grid.