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International Journal of Photoenergy
Volume 2016, Article ID 9020567, 12 pages
http://dx.doi.org/10.1155/2016/9020567
Research Article

The Effect of Photovoltaic Panels on the Rooftop Temperature in the EnergyPlus Simulation Environment

1School of Architecture, Southeast University, Nanjing 210096, China
2Key Laboratory of Urban and Architectural Heritage Conservation (Southeast University), Ministry of Education, Nanjing 210096, China
3College of Engineering and Applied Science, University of Colorado Denver, Denver, CO 80217, USA

Received 15 October 2015; Revised 1 January 2016; Accepted 18 January 2016

Academic Editor: Ahmad Umar

Copyright © 2016 Changhai Peng and Jianqiang Yang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this paper, the effects that photovoltaic (PV) panels have on the rooftop temperature in the EnergyPlus simulation environment were investigated for the following cases: with and without PV panels, with and without exposure to sunlight, and using roof materials with different thermal conductivities and for different climatic zones. The results demonstrate that heat transfer by convection, radiation, and conduction in the air gaps between PV panels and the building envelope can be simulated in the EnergyPlus environment when these air gaps are in the “air conditioning zone.” Nevertheless, in most cases, particularly on the rooftop, the air gaps between the PV panels and the building envelope cannot be set as the “air conditioning zone.” Therefore, in this case, none of the EnergyPlus models are appropriate to simulate the effect that PV panels have on the rooftop temperature. However, all the terms of the Heat Balance Model, including the absorbed direct and diffuse solar radiation, net long-wave radiation with the air and surroundings, convective exchange with the outside air, and conduction flux in or out of the surface, can still be used to calculate the temperature and heat flux within the BIPV’s air gap.