The Impact of Transpired Solar Air System on PV Efficiency

M.Masaood Hashmi; P.Akhter; S.Hussain; E. C. Kang; G.H.Kang; E.J.Lee

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자료유형: 학술대회자료

저자정보: M.Masaood Hashmi P.Akhter S.Hussain E. C. Kang G.H.Kang E.J.Lee

저널정보: 한국태양에너지학회 한국태양에너지학회 학술대회논문집 한국태양에너지학회 2004 Proceedings ISEA Asia-Pacific

발행연도: 2004.10

수록면: 875 - 881 (7page)

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Building Integrated Photovoltaic (BIPV) technology has been one major area of PV applications. The technology provides a cohesive design, construction, and sustainable solution for the built environment (J. Benemann, 2001 and M. Oliver, 2001). It is a well-known fact that a PV cell converts only a small fraction of the absorbed solar radiation into electricity, and the rest into heat. The latter leads to an elevated cell temperature and consequently, a degradation of PV power. Heat removal from the PV modules is able to improve the electricity generation, and to extend the equipment working life through a reduction of thermal cycles and stresses. The means of heat removal is best through PV cogeneration (Y. Tripanagnostopoulos, 2002 and H.P. Garg, 1997).
A popular research area in PV cogeneration is in BIPV /thermal technology (M.D. Bazilian, 2002). This involves the removal and the subsequent use of waste heat through a convective airflow behind the PV panels. At the same time, the cooling effect lowers the space air- conditioning load in warm climates when the PV panels are fixed on the external wall and the thermal transmission is thus reduced. The total (electrical plus thermal) energy output of the hybrid PV system depends on a number of factors, including the incident solar radiations, the ambient temperature, the wind speed, and the absorber plate dimensions (K. Sopian, 1996). Free air convective cooling is a simple and low cost method to remove heat from the back of the PV modules and to keep the electrical efficiency at an acceptable level.
Although there is a large amount of literature on PV systems and, increasingly, building- integrated components (PV, Proc, 1995), relatively little work has been carried out on hybrid systems where use is made of the heat recovered. Recent years have seen some practical studies on the latter subject (Yang H, 1994 and Wouters P, 1996).Electrical efficiency of PV system decreases with increasing temperature, so that ventilating the facade or roof increases power production.
This paper begins by describing a method for predicting the electrical power output as a function of module characteristics, incident solar radiation and module temperature. The main purpose of this paper is to see the impact of effective cooling of a PV panel on the electricity output due to transpired solar air system. Also the results of temperature and PV output power measurements are included in this paper as for reference (collected at the UK laboratories). The experimental and predicted results (collected at KIER) are presented and discussed along with recommendations for further research and development.

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