중온 태양열 축열조용 히트파이프의 작동액체 충전량이 열성능에 미치는 영향 = The Effect of Working Fluid Charge on the Performance of a Heat Pipe for Medium-temperature Solar Thermal Storage System

다국어 초록 (Multilingual Abstract)

An experimental study was conducted to investigate the thermal performance of a medium-temperature heat pipe against the charge amount of working fluid. The container and the wick of the heat pipe were made of stainless steel and the working fluid was Dowtherm-A for medium-temperature applications around 250℃. The diameter and length of the heat pipe were 25.4 ㎜ and 1 m, respectively. The maximum thermal load was 1 ㎾ and the working fluid charge ratio varied from 372% to 420%. The results showed that the thermal resistance ranged from 0.12 to 0.15 ℃/W and the effective thermal conductance ranged from 7,703 to 8,898 W/m · K. Dry-out occurred for the heat pipe with 372% fill-charge at the heat load of 950 W, while the other heat pipes with higher charge amount did not encounter dry-out up to 1060 W.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 실험장치 및 실험방법
• 3. 실험 결과
• 4. 결론
• 후기
• 참고문헌