研究目的
To carry out an experimental investigation to compare the performances of four PVT collectors having three different ribbed surfaces (Trapezoidal, Saw teeth (tooth) forward, Saw teeth backward rib) and a flat plate opposite to each absorber plate.
研究成果
The study demonstrated that modifications in the air channel of hybrid PVT systems, such as using ribbed surfaces, can significantly improve thermal efficiency. The setup with Trapezoidal ribs showed the best performance among all setups. The PVT/dual system can be effectively used to heat water, with the potential to operate both heat extraction modes in mild weather conditions.
研究不足
The study focused on thermal output more than electrical output, as no electrical load was used as part of the setup. The performance was evaluated under specific weather conditions in Bangladesh, which may not be representative of all climates.
1：Experimental Design and Method Selection:
The study involved designing an experimental PVT dual system with modifications in the air channel, including placing a thin flat metallic sheet (TMS) inside the air channel and using painted black ribbed surfaces at the bottom of the air channel. Four experimental setups with different ribbed surfaces and a flat plate were used to observe variations in heat transmittance.
2：Sample Selection and Data Sources:
The performance study was carried out during the months of February to June, 2012 at IUT campus, Gazipur, Bangladesh, using four experimental setups of the same capacity, projected area, and water heat extraction method.
3：List of Experimental Equipment and Materials:
The setups included PV panels, a thin metallic sheet (TMS), pipes for water circulation, and different ribbed surfaces (Trapezoidal, Saw teeth forward, Saw teeth backward) and a flat plate.
4：Experimental Procedures and Operational Workflow:
The collectors were installed facing south with an inclination angle of 23.5 degrees. Temperatures were measured for PV panel and water heat exchanger using thermocouples, and ambient temperatures and solar radiation were recorded hourly.
5：5 degrees. Temperatures were measured for PV panel and water heat exchanger using thermocouples, and ambient temperatures and solar radiation were recorded hourly.
Data Analysis Methods:
5. Data Analysis Methods: Thermal efficiency was calculated based on the heat energy absorbed and the solar radiation received.
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