| Title |
Influence of Working Fluids to Heat Transfer Characteristics of the Heat Exchanger using Oscillating Capillary Tube Heat Pipe for Low Temperature Waste Heat Recovery |
| Keywords |
Oscillating capillary tube heat pipe ; 진동세관형 히트파이프 ; Thermosyphon ; 열싸이폰 ; Thermal resistance ; 열저항 ; Figure of merit ; 평가지수 |
| Abstract |
Heat transfer characteristics of a heat exchanger for low temperature waste heat recovery using oscillating capillary tube heat pipe were evaluated against the charge ratio variation of working fluid and various working fluids. R-142b, R-22 and R-290 were used as working fluids. The heat exchanger was composed of heat pipe with capillary tube bundles, having a 2.6mm in outer diameter, 1.4mm in inner diameter with 101m long, and 40 turns. Charge ratio of working fluid was 40% and 50%. Water was used as secondary fluid. Inlet temperature and mass velocity for each secondary fluid were 297 K, 280 K and 9∼27 kg/m2s, respectively. From experimental results, it was found that heat transfer performance of R-22 was higher than those of R-142b and R-290 andit was proportional to Figure of merit for thermosyphons. As a result, it was thought that R-22 was the most suitable working fluid of waste heat recovery for low temperature waste heat recovery. |