부산대학교 도서관

The high energy consumption in the greenhouse during the winter season dictates a need to develop various thermal screens for energy-saving purposes. However, there is limited data on the precise properties of thermal screens, while little research has investigated a methodological approach for measuring the screen’s energy-saving capacity for greenhouse energy efficiency. This research aims to investigate the thermophysical, radiative, and aerodynamic properties of selected commercial greenhouse thermal screens. The TRNSYS model was used to simulate the heat flux and derive the thermal retention qualities of the thermal screens through their measured properties. The model was validated by comparing the simulated and experimental heat transfer coefficients, expressed as the U-values, thereby determining the thermal retention of the screens. In addition, the simulated U-value was compared to the experimental U-value in material permeability to examine the influence of screen porosity on heat loss. The statistical analysis t-test was conducted to compare the U-values obtained from the simulation and the experimental hotbox. The simulation U-values (for computed permeability) indicated that samples M1 and M3 exhibited the lowest U-value of 4.4 W m?? K??, while white polyester, Luxous, PH-super, PH-66, M2, Clima45(0), and New-Lux showed higher U-values of 82%, 105%, 161%, 123%, 41%, 102%, and 118%, respectively. The R² value of 0.88 indicated the model’s fitness using the coefficient of variation. Because of their low material porosity, M1, M2, and M3 samples showed better greenhouse thermal retention over others. Conclusively, the permeability features of the greenhouse energy screen materials have a substantial impact on their U-values.