The Optimum Tilt Angles and Orientations of PV Claddings for Building-Integrated Photovoltaic (BIPV) Applications

[+] Author and Article Information
Hongxing Yang

Department of Building Services Engineering,  The Hong Kong Polytechnic University, Kowloon, Hong Kongbehxyang@polyu.edu.hk

Lin Lu

Department of Building Services Engineering,  The Hong Kong Polytechnic University, Hong Kongbellu@polyu.edu.hk

J. Sol. Energy Eng 129(2), 253-255 (Nov 14, 2005) (3 pages) doi:10.1115/1.2212439 History: Received August 26, 2004; Revised November 14, 2005

The tilt and azimuth angles of a photovoltaic (PV) array affect the amount of incident solar radiation exposed on the array. This paper develops a new mathematical model for calculating the optimum tilt angles and azimuth angles for building-integrated photovoltaic (BIPV) applications in Hong Kong on yearly, seasonal, and monthly bases. The influence of PV cladding orientation on the power output of PV modules is also investigated. The correlations between the optimum tilt angle and local weather conditions or local environmental conditions are investigated. The results give reasonable solutions for the optimum tilt angles for BIPV applications for both grid-connected and stand-alone systems.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Optimum slopes and maximum yearly solar radiation profiles

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Figure 2

Effect of tilt angles on yearly absorbed solar radiation on PV panels (upper to lower curves: γ=0, −30, −45, −60, −90deg)

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Figure 3

Yearly optimum tilt angle and clearness index for south-facing PV facade



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