The research and development of high performance multi-bent evaporator in air conditioning unit

• Main Authors: FU-SHIUNG SHIH, 施富雄
• Other Authors: JIN-YUH JANG
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/57987527324040960944

碩士 === 國立成功大學 === 機械工程學系 === 87 === There are two parts in this paper. For the first part, an induced wind tunnel was used to measure the thermal-hydraulic characteristics of multi-bent evaporator for different fin shapes (louver, wavy fins), different fin pitches( 18,20 and 22 fins per inch) . The second part of this paper was to develop an air conditioning unit with cooling capacity of 4000kcal/hr and Energy Efficiency Ratio (EER) of 2.5 kcal/hr.w. ﹙1﹚ The first part of this paper: Measurements were made for the air frontal velocity ranging from 0.8 m/s ~ 4.5 m/s , while the water inlet temperature and flow rate were maintained at 70℃ , 6 L/min for the dry coils and at 10℃ , 6 L/min for the wet coils , respectively. The experimental results indicated that , louver fins have higher Colburn and friction factors compared to the wavy fins. ﹙2﹚ The second part of this paper: The performances of an air-conditioning unit were measured in an environmental-controlled chamber. The refrigerant in the tube side is R22. It is found that to get a cooling capacity of 4000kcal/hr and EER of 2.5 kcal/hr.w, one must uses louver fin with fin pitch 18fins/inch, the capillary tube with diameterψ1.7mm and length 600mm, and the R22 filling mass of 1100g.