The Optimal Thermo-Hydraulic Design for the Indoor Unit of a Split-Type Air-Conditioner

• Main Authors: Hua-Lin Wu, 吳華麟
• Other Authors: Yang-Cheng Shih
• Format: Others
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/52t4ub

碩士 === 國立臺北科技大學 === 冷凍空調工程系所 === 105 === Split-type air-conditioners are widely used in a household and an office. However, global warming makes the mean monthly temperature strike the new highs over and over again in Taiwan that cause annual electric power consumption of air-conditioning to increases drastically. Therefore, enhancing the performance of split-type air-conditioner and finding the relationship between geometrical parameters and performance parameters not only can save energy and reduce carbon emissions but improve the research and development capacity at home. Most research related to indoor unit of a split-type air-conditioners focused on analyzing the flow field of cross-flow fan(CFF), ignoring the influence of compact heat exchanger on the heat transfer performance for the system. As a result, this study adopted the CFD softwave-ANSYS FLUENT to analyze the internal flow field of indoor unit of a split-type air-conditioner. In addition, the study used optimal software-ANSYS DesignXplorer to optimize the thermo-hydraulic performance of the indoor unit of a split-type air-conditioner and discover the most important geometrical parameter influencing the performance. According to the results, the most important design variable is the tongue gap, and the secondary is the radius of curvature of first cut rear wall. Finally, the optimal combination to reach the best performance is suggested as the tongue gap of 2.15mm, the rear wall gap of 8.4mm, the radius of curvature of first cut rear wall of 56.7mm, the radius of curvature of second cut rear wall of 98.8mm. Additionally, comparing the optimal model with the original model, the flow coefficient, the total pressure coefficient and the Nusselt number of heat exchanger increase 20.6%, 32.8% and 9.5%.