Dynamic performance forecast analysis of MHP-PV/T-IDXSAHP system during heating season

Abstract

MHP-PV/T is a novel PV/T with phase change heat transfer, uniform flow of working medium and good anti-freeze performance. The excellent year-round performance of MHP-PV/T has been demonstrated in previous studies and is more suitable for winter heating in northern China. In this work, we further combine MHP-PV/T with dual source heat pump to form an experimentally validated indirect expansion-solar assisted heat pump (IDX-SAHP) system and simulates the overall performance of the heating system in winter based on TRNSYS in Lanzhou, China. The component type50b of TRNSYS was modified to make it closer to the actual results of MHP-PV/T. Research shown that the thermal efficiency of MHP-PV/T heat pump system can be maintained well throughout the heating season at the SAHP/ASHP switching temperature is 7 ℃ in winter. The net system energy efficiency ratio (NSEER) during heating season is range from 3.28 to 5.42, which can achieve highly efficient and low cost heating. For this system, the photovoltaic power generation is sufficient to meet the operation of three water pumps. By connecting surplus electricity to the grid, a total of 1806.25 ¥ of electricity revenue can be obtained around the year. The PEUR of the system is 72.26 %, the DPP taking 5.133 years, and the annual CO2 emission reduction is 13486.5 kg. Significant energy, economic, and environmental benefits of the system. This study demonstrates the application prospects of PV/T heat pumps and provides a reference basis for subsequent research on MHP-PV/T heat pump systems in cold regions.