Experimental study on thermal performance of a pulsating heat pipe using R1233zd(E) as working fluid

作者：Wu, Linli; Chen, Jun; Wang, Shuangfeng^*

来源：INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 2022, 135: 106152.

DOI：10.1016/j.icheatmasstransfer.2022.106152

• Pulsating heat pipe
• R1233zd(E)
• Non-dimensional correlation
• Thermal performance

An experiment is conducted to explore the thermal characteristics of a fourth-generation environmental refrigerant R1233zd(E) as working fluid for pulsating heat pipes (PHPs). The influences of inner diameter in 1.0 mm, 1.5 mm, and 2.0 mm, filling ratio around 40-70% and gravity on start-up characteristics are also studied. The experimental results show that, when R1233zd(E) is used as working fluid, PHP with diameter over 1.5 mm has lower thermal resistance, which can be reduced to 0.1184 C/W under the optimum filling ratio of 50-60%. Increasing filling ratio will improve the maximum heat transfer capacity of PHP with diameter of 1 mm. PHPs with high filling ratio at 70% can start vertically, however, its heat transfer performance deteriorates under horizontal mode. The maximum heat transfer capacity of 190 W is obtained in the 2.0 mm ID PHP at a filling ratio around 50%. Finally, based on total 180 groups of experimental data, an empirical correlation with relevancy of 95% is proposed to predict the thermal performance of vertical PHP with R1233zd(E), and supervise the application design of PHP.