Interactions between Building Integrated Photovoltaics and Microclimate in Urban Environments

[+] Author and Article Information
Yiping Wang

School of Chemical Engineering and Technology,  Tianjin University, Tianjin, 300072, Chinatjtianjin@yahoo.com.cn

Wei Tian, Li Zhu, Jianbo Ren, Yonghui Liu, Jinli Zhang

School of Chemical Engineering and Technology,  Tianjin University, Tianjin, 300072, China

Bing Yuan

School of Science,  Tianjin University, Tianjin, 300072, Chinatjtianjin@126.com

J. Sol. Energy Eng 128(2), 168-172 (Aug 30, 2005) (5 pages) doi:10.1115/1.2188533 History: Received May 19, 2005; Revised August 30, 2005

BIPV (building integrated photovoltaics) has progressed in the past years and become an element to be considered in city planning. BIPV has significant influence on microclimate in urban environments and the performance of BIPV is also affected by urban climate. The thermal model and electrical performance model of ventilated BIPV are combined to predict PV temperature and PV power output in Tianjin, China. Then, by using dynamic building energy model, the building cooling load for installing BIPV is calculated. A multi-layer model AUSSSM of urban canopy layer is used to assess the effect of BIPV on the Urban Heat Island (UHI). The simulation results show that in comparison with the conventional roof, the total building cooling load with ventilation PV roof may be decreased by 10%. The UHI effect after using BIPV relies on the surface absorptivity of original building. In this case, the daily total PV electricity output in urban areas may be reduced by 13% compared with the suburban areas due to UHI and solar radiation attenuation because of urban air pollution. The calculation results reveal that it is necessary to pay attention to and further analyze interactions between BIPV and microclimate in urban environments to decrease urban pollution, improve BIPV performance and reduce cooling load.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

BIPV system and heat transfer

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Figure 2

Solar irradiance and ambient temperature

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Figure 3

Comparison of cooling load through PV roof and conventional roof

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Figure 4

Comparison of total building cooling load between PV roof and conventional roof

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Figure 5

Comparison of daily building cooling load between conventional roof with different absorptivities and PV roof

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Figure 6

Comparison of PV roof with different absorptivities conventional roof on UHI effect

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Figure 7

Comparison of PV electricity output between urban and suburban areas




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