scholarly journals Comparison of Thermal Performance Characteristics of Ammonia and Propylene Loop Heat Pipes

2000 ◽  
Author(s):  
Tarik Kaya ◽  
Charles Baker ◽  
Ku Jentung
Keyword(s):  
Thermal Performance ◽  
Heat Pipes ◽  
Performance Characteristics ◽  
Loop Heat Pipes

Experimental investigation of thermal performance characteristics of sintered copper wicked and grooved heat pipes: A comparative study

2021 ◽  
Vol 28 (11) ◽  
pp. 3507-3520
Author(s):  
Saif Ullah Khalid ◽  
Hafiz Muhammad Ali ◽  
Muhammad Ali Nasir ◽  
Riffat Asim Pasha ◽  
Zafar Said ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Comparative Study ◽  
Thermal Performance ◽  
Heat Pipes ◽  
Performance Characteristics ◽  
Sintered Copper

Comparative Study on Thermal Performance of Ultrathin Miniature Loop Heat Pipes With Different Internal Wicks

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Guohui Zhou ◽  
Ji Li ◽  
Lucang Lv ◽  
G. P. Peterson
Keyword(s):  
Experimental Investigation ◽  
Thermal Performance ◽  
Heat Transfer Performance ◽  
Heat Pipes ◽  
Copper Plate ◽  
Loop Heat Pipes ◽  
Liquid Line ◽  
Horizontal Orientation ◽  
Cooling Mechanism ◽  
Heat Loads

Presented here are the results of an experimental investigation of two ultrathin miniature loop heat pipes (mLHPs) with different internal wicking structures: one with a primary wicking structure in the evaporator and a secondary wicking structure in the liquid line, and the other only with the same primary wicking structure in the evaporator, but no secondary wick. The systematic experimental investigation was conducted using natural convection as the cooling mechanism in order to study the heat transfer performance of the two mLHPs and fully examine the effects of the secondary wick. The results indicated that both of the test articles could effectively dissipate 12 W at all test orientations with a minimum total thermal resistances of 6.38 °C/W and 6.39 °C/W, respectively. However, the results indicated that the presence of the secondary wicking structure in the liquid line at low power loads resulted in more stable startup characteristics and a weaker dependence on the different orientations. Moreover, it was demonstrated that the steady-state evaporator temperatures of the test article with the secondary wicking structure in the liquid line were much lower than those observed for a 1-mm thick copper plate with the same geometric dimensions for all heat loads in the horizontal orientation, showing a higher thermal performance.

Thermal performance of biomaterial wick loop heat pipes with water-base Al2O3 nanofluids

2014 ◽  
Vol 76 ◽  
pp. 128-136 ◽  
Author(s):  
Nandy Putra ◽  
Rosari Saleh ◽  
Wayan Nata Septiadi ◽  
Ashar Okta ◽  
Zein Hamid
Keyword(s):  
Thermal Performance ◽  
Heat Pipes ◽  
Loop Heat Pipes ◽  
Water Base

Derivation and Validation of a Figure of Merit for Loop Heat Pipes With Medium Temperature Working Fluids

2016 ◽  
Vol 138 (5) ◽  
Author(s):  
Wukchul Joung ◽  
Jinho Lee ◽  
Sanghyun Lee ◽  
Joohyun Lee
Keyword(s):  
Steady State ◽  
Thermal Performance ◽  
Figure Of Merit ◽  
Saturation Pressure ◽  
Heat Pipes ◽  
Working Fluid ◽  
Medium Temperature ◽  
Working Fluids ◽  
Loop Heat Pipes ◽  
Compensation Chamber

The working fluids of loop heat pipes (LHPs) play an important role in the operation of the LHPs by influencing the operating temperatures and the heat transfer limits. Therefore, the proper selection of a working fluid is a key practice in LHP fabrication, and there has been a high demand for an appropriate index that enables the quantitative comparison of the steady-state thermal performance of the working fluids. In this work, a figure of merit for LHPs was theoretically derived and experimentally verified. In particular, the pressure losses in the LHP operation were balanced with the saturation pressure difference between the evaporator and the compensation chamber to derive the figure of merit. This derived figure of merit for LHPs successfully predicted the steady-state thermal performance of the tested working fluids within the variable conductance regime. In the constant conductance regime, the differences in the condenser cooling capacity and in the liquid subcooling for different working fluids determined the thermal performance of each working fluid. The limitations and prospects of the proposed figure of merit were discussed in detail.

scholarly journals Thermal performance of loop heat pipes with smooth and rough porous copper fiber sintered sheets

2017 ◽  
Vol 153 ◽  
pp. 323-334 ◽  
Author(s):  
Weisong Ling ◽  
Wei Zhou ◽  
Wei Yu ◽  
Ruiliang Liu ◽  
K.S. Hui
Keyword(s):  
Thermal Performance ◽  
Heat Pipes ◽  
Loop Heat Pipes ◽  
Porous Copper
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