Optimization Of Coupled Ground Source Heat Pump And PVT For Cooling,heating And Power System

Approximately 40%of global energy consumption is used to meet the demands for heating,cooling,electricity,and hot water in buildings and households.With the introduction of carbon peak and carbon neutrality goals,promoting clean,low-carbon,safe,and efficient use of energy,and using distributed energy supply systems combined with renewable energy sources according to local conditions has become an inevitable trend for China’s future development.Among various renewable energy sources,solar energy is an inexhaustible resource,and the PV/T system,which can not only increase the efficiency of photovoltaic power generation by reducing the temperature of the photovoltaic panel but also obtain heat,is currently receiving significant attention.Geothermal energy is also a stable and abundant renewable energy source,and the GSHP system can supply more heating and cooling loads with minimal electrical input.This article proposes a combined heating,cooling,and electricity supply system that integrates PV/T and GSHP,which fully utilizes renewable energy sources such as solar and geothermal energy,reduces the use of fossil fuels,and performs cascade utilization of energy to improve the energy utilization efficiency of the system.Firstly,a certain office building in Beijing was selected as the target building,and it was simulated and modeled using TRNSYS.Typical meteorological parameters for the Beijing region were input to obtain the building’s annual heating and cooling load data.The reliability of the data was confirmed through comparative verification,and a traditional heating,cooling,and electricity supply system based on an internal combustion engine was constructed based on this dat.Secondly,the mathematical models and energy balances of the coupled system components were discussed,and the control strategy and operation mode of the coupled system were designed.Based on different evaluation indicators,various operation modes were analyzed and compared.It was found that the mixed mode of heat-based and electricity-based operation was the optimal choice for the coupled system in terms of energy efficiency and environmental impact.Therefore,the mixed mode was determined as the most suitable operation mode for the coupled system.Finally,the operation of the system was introduced and analyzed under different operating conditions on typical winter and summer days.Then,the annual operation characteristics of each component of the system were summarized and analyzed.The evaluation indicators of the coupled supply system and the traditional supply system were compared and analyzed separately under winter and summer operating conditions.Under winter operating conditions,the primary energy saving rate of the coupled supply system relative to the traditional supply system was 27.44%,and the CO2 emission reduction rate was 22.79%.Under summer operating conditions,the primary energy saving rate of the coupled supply system relative to the traditional supply system was 24.56%,and the CO2emission reduction rate was 16.79%.This indicates that the energy-saving performance and environmental performance of the coupled supply system are significantly better than those of the traditional supply system.