Heat harvesting characteristics of building façades integrated photovoltaic /thermal-heat pump system in winter

Chunxiao Zhang, Lei Chen, Ziqi Zhou, Zhanwei Wang, Lin Wang and Wenzhe Wei

Renewable Energy, 2023, vol. 215, issue C

Abstract: The water temperature of building-integrated photovoltaic/thermal systems is an important indicator of building space heating. However, in the winter, this system's heat loss is significant, and the low-temperature water cannot meet building heating standards. Meanwhile, previous research on building envelopes integrated PV/T - heat pump systems have primarily focused on the performance of systems installed on limited roofs of buildings, which conflicts with the requirement for energy consumption in metropolitan high-rise buildings. This study proposes a photovoltaic/thermal-heat pump system (BIPV/T-HP) mounted on the building façade to solve this problem, and a numerical model is developed to assess the heating performance. The results showed that increasing the flow velocity from 0.05 m/s to 0.5 m/s reduces the mean outlet water temperature from 16.11 °C to 9.55 °C, but increases the operating times of the heat pump from 6 to 8 in January, and increases the heating capacity of the BIPV/T - HP system from 58.6 kWh to 90.5 kWh over the entire heating season. Meanwhile, higher temperature thresholds raise mean water temperature and increase heat loss, resulting in a reduction in heat pump output from 111.3 kWh to 50.2 kWh.

Keywords: Photovoltaic /thermal system; Heat pump; Building façades; Heating capacity (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:215:y:2023:i:c:s0960148123008091

DOI: 10.1016/j.renene.2023.118909

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