In the quest for low-carbon and energy-efficient buildings, a novel combined heat and power system is making waves in the construction and energy sectors. Researchers, led by Haoran Ning from the School of Energy and Civil Engineering at Harbin University of Commerce in China, have developed a system that integrates solar photovoltaic-thermal (PV/T) components with an air-source heat pump (ASHP). This innovative approach aims to revolutionize how residential buildings generate and utilize energy.
The system, tested in Fuzhou City, China, showcases impressive performance metrics. When the ASHP operates independently, the average coefficient of performance (COP) is 4.66. However, when the PV/T component is integrated with the ASHP, the average COP jumps to 5.37. This significant improvement highlights the potential of combining renewable energy sources with traditional heating systems.
On sunny days, the system’s 32 PV/T components generate an average daily thermal output of 24 kW and produce 64 kW·h of electricity. Even on cloudy days, the system maintains an average daily power generation of 15.6 kW·h, with residual power stored in batteries ensuring continuous energy supply. “The system’s ability to store and utilize energy efficiently is a game-changer,” says Haoran Ning, the lead author of the study published in the journal ‘Buildings’ (translated from Chinese as ‘Buildings’).
One of the standout features of this system is its novel polygonal Freon circulation channel design on the back panel of the PV/T component. This design enhances the overall energy utilization efficiency from 5.68% to 17.76% compared to conventional PV systems. The system also achieves an average cooling efficiency of 45.02% and maintains a low thermal loss coefficient variation rate of 5.07%.
The hot water temperature stored in the tank reaches 46.8 °C, meeting typical household hot water requirements. The optimal water tank capacity for the system is determined to be 450 liters. These findings suggest that the system could significantly reduce energy costs and carbon emissions for residential buildings.
The commercial implications of this research are substantial. As the global demand for energy-efficient and sustainable buildings grows, this combined heat and power system offers a viable solution. It not only improves energy efficiency but also provides economic and environmental benefits. “This system demonstrates significant potential for providing efficient combined heat and power supply for buildings,” Ning emphasizes.
The research published in ‘Buildings’ serves as a reference for future developments in low-carbon and energy-saving building technologies. As the construction industry continues to evolve, innovations like this combined heat and power system could play a pivotal role in shaping a more sustainable future. The findings underscore the importance of integrating renewable energy sources with traditional systems to achieve optimal performance and efficiency. This study is a step forward in the journey towards energy-efficient and low-carbon buildings, setting a precedent for future research and development in the field.