Abstract
Photovoltaic-thermal road as solar collector is a promising technology. To expand the application of photovoltaic-thermal road, a novel energy system which integrated photovoltaic-thermal road with ground source heat pump system is proposed. Focus on this system, a dynamic mathematical model during non-heating season is established and validated, and it is used to explore the system performances under two operation modes: heat collection loop and heat storage loop operate simultaneously in mode 1 while they operate independently in mode 2. Furthermore, effects of setting temperature difference in both heat collection loop and heat storage loop on system performance are investigated. It is indicated that system performance in mode 1 is better than that in mode 2. As setting temperature difference in both heat collection loop and heat storage loop are increased, the thermal energy storage, electric power generation and energy consumption are decreased. And influence of setting temperature difference on thermal energy storage is greater than that on electricity generation. The overall efficiency under mode 1 and mode 2 are 27.12–36.96% and 18.78–26.36% respectively. Considering both energy generation and energy consumption, the optimal values of setting temperature difference in heat collection loop and heat storage loop are 2 °C and 10 °C under mode 1, and that are 2 °C and 4 °C under mode 2, respectively.
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