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Development of High-Efficiency Flat Plate Collector with Double Glazing
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Conventionally, solar thermal systems in South Korea have primarily focused on domestic hot water supply and partial space heating. However, with the recent expansion of applications to include industrial process heat and space heating in greenhouses with seasonal heat storage, there is an increasing requirement for developing highly efficient solar collectors that can operate effectively throughout the year. A solar thermal collector absorbs incoming solar radiation, converts it into thermal energy, and then transfers the energy to a heat-transfer fluid. The entire process should be optimized to minimize energy loss and ensure economic efficiency. A flat plate collector with single glazing is highly efficient at low temperatures and high solar intensities, whereas an evacuated tube collector is relatively efficient at high temperatures and low solar intensities. Therefore, in this study, we proposed a flat plate collector with double glazing that exhibited excellent thermal performance under all operating conditions. We validated the thermal performance through theoretical analysis and empirical experiments. In the theoretical analysis, we presented an analytical model for the comprehensive modeling of the flat plate collector and examined its thermal performance based on key design parameters, such as solar transmittance, emissivity, and gas fill. The thermal performance was confirmed, and an optimal design solution was derived. Furthermore, to validate the accuracy of our analysis, we conducted thermal performance testing on an optimized flat plate collector with double glazing, according to the specifications outlined in KS B 8295. The results showed a correlation between the simulation and experimental results.
Abstract
Conventionally, solar thermal systems in South Korea have primarily focused on domestic hot water supply and partial space heating. However, with the recent expansion of applications to include industrial process heat and space heating in greenhouses with seasonal heat storage, there is an increasing requirement for developing highly efficient solar collectors that can operate effectively throughout the year. A solar thermal collector absorbs incoming solar radiation, converts it into thermal energy, and then transfers the energy to a heat-transfer fluid. The entire process should be optimized to minimize energy loss and ensure economic efficiency. A flat plate collector with single glazing is highly efficient at low temperatures and high solar intensities, whereas an evacuated tube collector is relatively efficient at high temperatures and low solar intensities. Therefore, in this study, we proposed a flat plate collector with double glazing that exhibited excellent thermal performance under all operating conditions. We validated the thermal performance through theoretical analysis and empirical experiments. In the theoretical analysis, we presented an analytical model for the comprehensive modeling of the flat plate collector and examined its thermal performance based on key design parameters, such as solar transmittance, emissivity, and gas fill. The thermal performance was confirmed, and an optimal design solution was derived. Furthermore, to validate the accuracy of our analysis, we conducted thermal performance testing on an optimized flat plate collector with double glazing, according to the specifications outlined in KS B 8295. The results showed a correlation between the simulation and experimental results.
참고문헌 (14)
- Huang, J., "A Comprehensive Analysis on Development and Transition of the Solar Thermal Market in China with More Than 70% Market Share Worldwide", Energy, 174, pp.611~624 (2019)
- Gorjian, S., "A Review on Opportunities for Implementation of Solar Energy Technologies in Agricultural Greenhouses", Journal of Cleaner Production, 285, pp.1~30 (2021)
- Kavi, K. K., "Solar Thermal Energy Technologies and Its Applications for Process Heating and Power Generation – A Review", Journal of Cleaner Production, 282, pp.1~40 (2021)
- "IEA-SHC, Solar Heat Worldwide", ~ (2023)
- Dagdougui, H., "Thermal Analysis and Performance Optimization of a Solar Water Heater Flat Plate Collector : Application to Te"Ltouan(Morocco)", Renewable and Sustainable Energy Reviews, 15, pp.630~638 (2011)
- Föstea, S., "Performance and Reliability of a High Efficiency Flat Plate Collector – Final Results on Prototypes", Energy Procedia, 48, pp.48~57 (2014)
- Kim, J. H., "Development of Double-glazed Flat Plate Solar Collector for Medium Temperature Range", 2015 SAREK Summer Annual Conference, pp.527~530 (2015)
- Vettrivel, H., "Comparison Study of Solar Flat Plate Collector with Single and Double Glazing Systems", Inernational Journal of Renewable Energy Research, 7, pp.265~274 (2017)
- Ullah, F., "Numerical Simulation on Thermal Performance of Flat Plate Solar Collector with Double Glass Covers", Journal of Applied Sciences, 17, pp.502~510 (2017)
- "EN 12975-2:2006, Thermal Solar Systems and Components – Solar Collectors – Part 2: Test Methods", Beuth Verlag, ~ (2006)
- Bejan, A., "Heat Transfer" (1993), Wiley
- Duffie, J. A., "Solar Engineering of Thermal Process" (2013), Wiley & Sons Inc
- Hollands, K. G. T., "Free Convection Heat Transfer Across Inclined Air Layers", Transactions of ASME Journal of Heat Transfer, 98, pp.189~193 (1976)
- "KS B 8295: 2023, Solar Thermal Collectors (Flat Plate, Evacuated-Tube, Fixed Concentrating Type)", ~ (2023)