흡열판 디자인에 따른 액체식 PVT모듈의 열적 전기적 성능 비교분석

The water type photovoltaic/thermal(PVT) collector produces both thermal energy and electricity at the same time. The heat generated from PV modules can be removed for enhancing their electrical performance, and converted into useful thermal energy. In many studies, various designs of water type PVT collectors have been proposed according to glass cover, absorber, and so on. Futhermore, some studies dealt with the electrical and thermal performance of various PVT collectors. The thermal and electricity performance of PVT collector is related to not only the collector design such as the existence of glass cover, but also absorber type such as sheet-and-tube and fully wetted. The aim of this study is to analyze the electrical and thermal performance of water type unglazed PVT collectors according to the design of liquid pipes. For this experiment a new type of water type unglazed PVT collector was designed, which has rectangular tube absorber to improve heat exchange between the solar absorber plate and liquid pipes. there were two different prototypes of the PVT collectors according to the number of liquid pipe; 12 and 18. The experiments were carried out in outdoor condition, and the thermal and electrical performance of those PVT collectors was compared. The experimental results indicated thermal efficiency of the PVT collectors with 18tubes is about 20% higher than the PVT collector with 12tubes, and for the electrical efficiency, the former is about 10% higher than the latter. It can be claimed that the increase the number of liquid tubes at the PVT collector could improve its thermal and electrical performance.