An Experimental Study on Heat Transfer Performance of Free Cooling Via Oscillating Heat Pipe

• Main Authors: GUO, ZIH-YI, 郭子奕
• Other Authors: HSU, LI-CHIEH
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/269b72

碩士 === 國立雲林科技大學 === 機械工程系 === 105 === This study experimentally investigates an oscillating heat pipe with closed loop channel were made by harmonica-shaped aluminum tube which were used in automobile condenser. The surrounding area was about 720 mm × 152 mm. To reduce the energy consumption of the air conditioning system in the data center, the experiment was conducted for the purpose of absorbing the waste heat discharged from the server and lowering the temperature of the hot aisle in data center. The heat transfer performance of R134a refrigerant and HFE-7000 was observed at different hot aisle temperatures, and experiment conducted with different filling rate 30%, 50% and 70%, various wind speed of the condensing section 2 m/s and 2.5 m/s. Based on the test results, the thermal resistance of the oscillating heat pipe will be decreased because the increase with the temperature of the hot aisle. When using R-143a as a working fluid, the saturation temperature was higher than HFE-7000, therefore a higher heat transfer performance. When hot aisle temperature were fixed at 55 ℃, R134a refrigerant maximum heat transfer capacity was 782 W, HFE-7000 was 539 W. While the air flow rate in the condensation section is increased, the oscillation speed of the gas-liquid column in the heat pipe is accelerated. Hence the heat transfer performance of both working fluids can be increased. Using R-134a at 35℃ can effective operation with raise air volume, the heat transfer can be up to 260W.