研究目的
Evaluating the thermal and electrical performance of PV/T collectors under hot and humid weather conditions in Southern India, specifically focusing on the use of a wooden duct with baffles for cooling.
研究成果
The PV/T collectors show improved thermal and electrical efficiencies with forced convection compared to natural convection. Forced convection increases thermal efficiency from 7.33% to 23.71% and electrical efficiency from 11.41% to 13.56%. Higher mass flow rates enhance heat absorption, indicating the effectiveness of the cooling arrangement with a wooden duct and baffles in hot and humid conditions.
研究不足
The study is limited to a specific location (North Tamilnadu, India) and a single sunny day, which may not represent all climatic conditions. The use of wooden materials, while cost-effective, might have thermal properties that affect performance compared to metals. No long-term or seasonal variations are considered.
1：Experimental Design and Method Selection:
The study involves an outdoor experimental setup of a PV/T air collector with a single-pass channel. A wooden duct with baffles is used for cooling under natural and forced convection modes. Energy balance equations are employed for performance evaluation.
2：Sample Selection and Data Sources:
Experiments are conducted on a sunny day in February 2018 in Chennai, India, using a 260 W polycrystalline PV module. Data includes solar irradiance, temperatures, air flow rates, and electrical parameters.
3：List of Experimental Equipment and Materials:
PV module (Anchor Electricals Pvt. Ltd., model AE6P260WB4B), wooden duct made of plywood with dimensions 1750 x 1000 mm, baffles, blower for forced convection, solarimeter, anemometers, rheostat for load control, and temperature sensors.
4：Experimental Procedures and Operational Workflow:
The PV module is mounted on the duct, sealed with aluminum oxide paste. Readings are taken hourly from 9:00 AM to 5:00 PM for parameters like ambient temperature, glazing and tedlar temperatures, air inlet/outlet temperatures, solar irradiance, mass flow rate, current, and voltage. Natural convection uses atmospheric air; forced convection uses a blower with controlled mass flow rate.
5：Data Analysis Methods:
Thermal efficiency is calculated using HEG = Ma * Ca * Δt and ηThermal = HEG / (APV * S). Electrical efficiency is calculated using ηElectrical = (V * I) / (S * NS * NPV * APV). Data is analyzed to compare natural and forced convection modes.
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