Research on source-storage configuration optimization of renewable energy composite heating systems based on energy hubs

This paper takes heat pumps and thermal storage devices as research objects, and uses an energy hub model to simulate the heating systems. An optimization model is established targeting energy efficiency, economic efficiency, and environmental benefits. For residential and office building loads, the optimization results of the source-storage capacity of renewable energy composite heating systems are analysed using three evaluation indicators under different distribution modes of heat pumps and thermal storage devices. The results show that compared with the high-temperature heat pump on the primary side, when a low-temperature heat pump is arranged on the secondary side, the system energy efficiency of residential and office buildings increases by 56% and 54% respectively, the annual cost is reduced by about 40% and 40% respectively, and the comprehensive pollutant emissions are reduced by about 70%. The distribution pattern of thermal storage devices has little impact on the energy efficiency, economic and environmental benefits of the system. Among the six distribution modes, when the heat pump is located on the secondary side and thermal storage is on the primary side, the energy efficiency of residential buildings is 1.03 times that of office buildings, while the energy efficiencies of the other five distribution modes are the same. For the annual cost under economic benefit and the comprehensive pollutant emissions under environmental benefit, residential buildings are 1.58 to 1.76 times and 1.67 to 1.79 times that of office buildings, respectively.