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International Journal of Photoenergy
Volume 2012, Article ID 312168, 6 pages
Research Article

The Experimental Performance of an Unglazed PVT Collector with Two Different Absorber Types

1Green Home Energy Technology Research Center, Kongju National University, 275 Budae-Dong, Cheonan, Chungnam 330-717, Republic of Korea
2Department of Architectural Engineering, Kongju National University, 275 Budae-Dong, Cheonan, Chungnam 330-717, Republic of Korea

Received 6 April 2012; Revised 12 June 2012; Accepted 28 June 2012

Academic Editor: Tin-Tai Chow

Copyright © 2012 Jin-Hee Kim and Jun-Tae Kim. 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.


Photovoltaic-thermal collectors combine photovoltaic modules and solar thermal collectors, forming a single device that produces electricity and heat simultaneously. There are two types of liquid-type PVT collectors, depending on the existence or absence of a glass cover over the PV module. The glass-covered (glazed) PVT collector produces relatively more thermal energy but has a lower electrical yield, whereas the uncovered (unglazed) PVT collector has a relatively low thermal energy and somewhat higher electrical performance. The thermal and electrical performance of liquid-type PVT collectors is related not only to the collector design, such as whether a glass cover is used, but also to the absorber design, that is, whether the absorber is for the sheet-and-tube type or the fully wetted type. The design of the absorber, as it comes into contact with the PV modules and the liquid tubes, is regarded as important, as it is related to the heat transfer from the PV modules to the liquid in the tubes. In this paper, the experimental performance of two liquid-type PVT collectors, a sheet-and-tube type and a fully wetted type, was analyzed.