Experimental investigation of the heat transfer performance of a novel double independent chambers casing heat pipe applied for heat dissipation at low temperatures

In this study, a novel double independent chambers casing heat pipe (DCCHP) capable of running two types of coolants in two independent chambers has been developed and characterized. The DCCHP has been designed to attain an extended operating temperature range and sufficient heat transfer limit. To meet these requirements, water with high latent heat and methanol with ability to function normally in a low-temperature environment are chosen as the working fluids. A series of experimental studies related to the start-up performance and heat transfer limit have been carried out, specifically to analyze the effect of the coolant temperature and inclination angle. It was observed that DCCHP filled with two type of working fluids (water and methanol) had a superior start-up performance under the freezing point of water as compared to the pipe solely filled with water. The coolant temperature and inclination angle exhibited a remarkable influence on the low-temperature-start-up performance and heat transfer limit. Specifically, DCCHP-MW revealed the ability of low-temperature-startup, along with the maximum heat transfer coefficient of 350.38 W/m(2) degrees C at the heat load value of 25 W. The findings from this study provide an exceptional opportunity for the application of the developed pipe in electronic components in submarines, communication base stations, satellites requiring the low-temperature-start-up ability and sufficiently high heat transfer limit, etc.

Automated summary

A novel double independent chambers casing heat pipe (DCCHP) capable of running water and methanol in two independent chambers has been developed and characterized in this study. Experimental results showed that DCCHP-MW exhibited superior low-temperature-startup ability and a maximum heat transfer coefficient at 25 W, making it suitable for applications in submarines, communication base stations, and satellites.