Conference Paper

Proceedings of Building Simulation 2019: 16th Conference of IBPSA

Study on Thermal Isolation Efficiency for Air knife Applied to Opening between Two Temperature Difference Space

Yu-Lieh Wu, Pon-Shian Hsu, Jun-Tso Chiu
National Chin-Yi University of Technology, Taiwan

DOI: https://doi.org/10.26868/25222708.2019.210165
Abstract: This study discusses the thermal isolation efficiency of the air knife system at the opening of two spaces with temperature difference. As the tiny outlet of air knife can increase the supply air velocity to reduce the volume flow rate, forming a good air curtain barrier to reduce the energy loss and the effect of outside temperature on the interior is the key point of this study. This study uses Computational Fluid Dynamics to discuss the thermal isolation efficiency and heat affected zone coverage ratio of air knife in different configurations of supply air angle, supply air velocity and volume flow rate proportion of return air and supply air. The findings show that the thermal isolation efficiency obtained by turning the supply air angle towards the warm area is better than the configuration of vertically downward supply air, the maximum difference is 15%. The supply air velocity and thermal isolation efficiency are influenced by the supply air angle, but apparently the supply air angle toward the warm area can implement thermal insulation at a low supply air velocity. When the volume flow rate proportion is increased from 0.0 to 1.3, the thermal isolation efficiency is increased by about 5%, the increasing amplitude is obviously smaller than the thermal isolation efficiency obtained by changing the supply air angle and the supply air velocity. Keyword:Air knife, CFD, Supply air angle, Thermal isolation efficiency.
Keywords: Air knife, CFD, Supply air angle, Thermal isolation efficiency
Pages: 1756 - 1761
Paper: