Investigating and comparing the thermal performance of thermosyphon with different working fluids and filling ratios

In a variety of industries, thermosyphons are used to improve heat transfer. High reliability, easy maintenance and repairs, high thermal conductivity, and isothermal heat transfer are among its benefits. Thermosiphon is used for a variety of things, including cooling electronic components and air conditioning. In the studies conducted on the thermal performance of thermosyphons, it has been determined that the type of working fluid is very important. For this purpose, in this research, the thermal behavior of thermosyphons using two different working fluids has been investigated experimentally. A copper tube with a length of 1000 mm, an external diameter of 22 mm, and an internal diameter of 20 mm is used to construct the thermosyphon previously mentioned. The thermosyphon was tested with two working fluids—methyl acetate and deionized water—and three filling ratios—55%, 70%, and 85%—along with thermal loads ranging from 50 to 300 W and at a distance of 50 W. The results of the experiments revealed that this thermosyphon had a lower thermal resistance in the filling ratio of 70% of both fluids. Additionally, methyl acetate outperformed deionized water in terms of thermal performance by about 20–50%