Investigation of Energy Saving Potential for Reach-In Refrigerator Using Indirect Evaporative Condensers

• Main Authors: Yi-chin Chen, 陳易青
• Other Authors: Ming-Tsun Ke
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/92xzxk

碩士 === 國立臺北科技大學 === 冷凍空調工程系所 === 93 === Evaporative cooling is one of very effective heat transfer technologies. Using the indirect evaporative condenser can effectively improve the heat transfer ability of refrigerating machine. The indirect evaporative condenser not only can keep the higher heat transfer efficiency corresponding to direct evaporative condenser but also can avoid waste water and prevent the Legionellosis infected while using water cooling or evaporative cooling. Besides, it has no thermal pollution to the surrounding environment. Nowadays the Reach-In refrigerator seldom uses indirect evaporative condenser as its heat transfer device. Therefore, we try to combine Reach-In refrigerator with indirect evaporative condenser in this study and expect to get the better energy saving efficiency. With the experimental results, the operation efficiency can be obtained in both indirect evaporative cooling type and air cooling type systems also the optimal type of operating condition can be found out. Moreover, the simulated method developed in the present study has been used to investigate the relationships between indirect evaporative condenser capacity and process variables such as inlet dry bulb temperature, relative humidity , thickness of Evaporative Section and inlet air velocity. In addition, by comparing the experimental data with the theoretical analyzed results in the outlet air condition has been performed and the heat and mass transfer performance was also verified. Experimental results show that the coefficient of performance (COP) using indirect evaporative cooling type can be enhanced about 1 to 25 % compared to the air cooling type, and the compressor power consumption also can be saved about 5 to 7.8 %. Finally, the optimal operation efficiency of indirect evaporative condenser used in this study is obtained when the system’s condensation pressure is working at 1280 kPa.