Study on optimal allocation of solar photovoltaic thermal heat pump integrated energy system for domestic hot water

Abstract

In recent years, solar photovoltaic thermal heat pump has become a highly concerned near-zero carbon energy technology for domestic hot water. In order to facilitate the optimal configuration design of the system for domestic hot water, following studies were carried out in this paper: Firstly, the photovoltaic thermal heat pump integrated energy system was established and the operation study of the system was carried out. During the operation, the average coefficient of system heating performance was 2.76 in winter, 3.55 in transition season and 4.10 in summer. Afterwards, the prediction model of system operation performance was established and hourly system performance prediction of the system in the whole year was conducted. Then, the system for domestic hot water with a total installed photovoltaic capacity of 1 MW was taking as a case study to establish the calculation model. Finally, the optimal allocation of the system was carried out with the goal of minimizing the dynamic investment payback period, then the standard cell method was proposed to facilitate the optimal allocation design. The results showed that the minimum dynamic investment payback period of the system was 3.9 years and the daily hot water supply of the standard cell was 9.2tons.