CUED Publications database

Influence of a building's integrated-photovoltaics on heating and cooling loads

Wang, Y and Tian, W and Ren, J and Zhu, L and Wang, Q (2006) Influence of a building's integrated-photovoltaics on heating and cooling loads. Applied Energy, 83. pp. 989-1003. ISSN 0306-2619

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Abstract

Building integrated photovoltaics (BIPV) has the potential to become a major source of renewable energy in the urban environment. BIPV has significant influence on the heat transfer through the building envelope because of the change of the thermal resistance by adding or replacing the building elements. Four different roofs are used to assess the impacts of BIPV on the building's heating-and-cooling loads; namely ventilated air-gap BIPV, non-ventilated (closed) air-gap BIPV, closeroof mounted BIPV, and the conventional roof with no PV and no air gap. One-dimensional transient models of four cases are derived to evaluate the PV performances and building cooling-and-heating loads across the different roofs in order to select the appropriate PV building integration method in Tianjin, China. The simulation results show that the PV roof with ventilated air-gap is suitable for the application in summer because this integration leads to the low cooling load and high PV conversion efficiency. The PV roof with ventilation air-gap has a high time lag and small decrement factor in comparison with other three roofs and has the same heat gain as the cool roof of absorptance 0.4. In winter, BIPV of non-ventilated air gap is more appropriate due to the combination of the low heating-load through the PV roof and high PV electrical output. © 2005 Elsevier Ltd. All rights reserved.

Item Type: Article
Uncontrolled Keywords: BIPV Cooling load Heat transfer Heating load
Subjects: UNSPECIFIED
Divisions: Div D > Structures
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:22
Last Modified: 12 Dec 2014 19:04
DOI: 10.1016/j.apenergy.2005.10.002