Life cycle assessment optimization of hybrid power gas heat pump integrated with photovoltaic

Building energy consumption accounts for a large proportion in the total social energy consumption and solar energy plays an important role in the building renewable energy system. A novel hybrid power gas heat pump system integrated with photovoltaic is put forward in this paper. An optimization design based on life cycle assessment for the solar assisted hybrid power gas heat pump system (SHPGHP) is proposed in consideration of three main environmental impact factors: human health, ecosystem quality and resources. The normalized environmental impact for the system during the whole life cycle is chosen as the objective to minimize the life cycle environmental impact. The influence of main independent decision variables is employed including the photovoltaic ratio, transmission ratio and mixing degree. Results show that the optimal photovoltaic ratio is 0.4. The system's environmental impact potential increases with the increase of transmission ratio and decreases with the increase of mixing degree. (C) 2017 The Authors. Published by Elsevier Ltd.