Startup characteristics of an ammonia loop heat pipe with a rectangular evaporator

Bai, Lizhan; Yang, Zehui; Shen, Xiaobin; Guo, Yuandong; Lin, Guiping; Wen, Dongsheng

doi:10.1007/s00231-021-03139-1

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…The upper part of the evaporator wall temperature (T1) is the highest. This suggests that there is heat leakage due to conduction heat transfer and compression work due to vapor expansion in the evaporator [24]. T8 is also greater than T7 and T6, suggesting significant heat leakage from the evaporator to the liquid line.…”

Section: One Heat Sourcementioning

confidence: 98%

“…Startup depended on a superheat degree above 10°C or immediate startup with existing vapor in the grooves. Bai et al [24] developed a stainless steel-ammonia flat plate loop heat pipe (FLHP) for passive two-phase heat transfer, reducing system thermal resistance and enhancing temperature uniformity. Experiments showed excellent startup performance, starting up at a small heat load of 2 W with no overshoot.…”

Section: Introductionmentioning

confidence: 99%

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Startup characteristics of a water loop heat pipe with dual heat sources for battery thermal management system in electric vehicle

Fathoni,

Hendrayanto,

Aliefiansyah

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The usage of electric vehicles has significantly reduced emissions of greenhouse gases and other pollutants. However, the high heat release generated by the electric vehicle batteries poses a challenge. To solve this problem, scientists have created a passive cooling thermal management system specifically for electric vehicle based on heat pipes, particularly loop heat pipes. A battery pack often consists of several battery modules, which results in multiple heat sources being dispersed according to their power capacity. Startup behavior of loop heat pipe has been investigated extensively in the literature. However, most of the studies use only one heat source. This paper aims to fill the research gap, particularly when the system is implemented in dual heat sources managed by only one evaporator. To achieve the research objectives, a custom loop heat pipe was constructed. This cooling system’s design is briefly described. The evaporator is made of copper, deionized water was selected as the working fluid because of its high merit number, which indicates strong performance as a heat pipe working fluid and the stainless-steel wire mesh serves as the porous wick. Battery simulator was built using aluminum material and a cartridge heater to mimic the heat produced by the battery. Two case studies were done. First, only one battery simulator was used. Second, two battery simulators were placed on both sides of the evaporator. A type-K thermocouple attached to the NI DAQ 9214 module was used to measure the temperature while the electric heat load varied between 10 W and 50 W. The study investigated the interaction between the heat load distribution and the startup behavior of the loop heat pipe. Startup behavior is crucial for the performance of the loop heat pipe. Based on the experimental results, the loop heat pipe demonstrates outstanding startup performance. It can effectively initiate operation even at a minimal heat load as low as 30 W for the first and second case study. The findings of the study indicate that the dual heat source arrangement effectively mitigates overshoot temperatures and enhances heat transfer performance by increasing the contact area.

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Section: One Heat Sourcementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%