scholarly journals Active Control of the Operating Temperature in a Loop Heat Pipe with Two Evaporators and Two Condensers

2001 ◽  
Author(s):  
Jentung Ku ◽  
Gajanana C. Birur
Keyword(s):  
Heat Pipe ◽  
Active Control ◽  
Operating Temperature ◽  
Loop Heat Pipe

Hydraulic operating temperature control of a loop heat pipe

2015 ◽  
Vol 86 ◽  
pp. 796-808 ◽  
Author(s):  
Wukchul Joung ◽  
Kee Sool Gam ◽  
Yong-Gyoo Kim ◽  
Inseok Yang
Keyword(s):  
Heat Pipe ◽  
Temperature Control ◽  
Operating Temperature ◽  
Loop Heat Pipe

Loop Heat Pipe Operating Temperature Dependence on Liquid Line Return Temperature

2004 ◽  
Author(s):  
Paul Rogers ◽  
Jeffrey Perez ◽  
Jentung Ku ◽  
Mark Kobel ◽  
Jay Ochterbeck ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Heat Pipe ◽  
Operating Temperature ◽  
Loop Heat Pipe ◽  
Liquid Line

SET-POINT ACTIVE CONTROL OF VAPOR-MODULATED LOOP HEAT PIPE

2012 ◽  
Vol 3 (2-4) ◽  
pp. 263-280
Author(s):  
Alejandro Torres ◽  
Donatas Mishkinis ◽  
Francisco Romera ◽  
J. Corrochano ◽  
T. Kaya
Keyword(s):  
Heat Pipe ◽  
Active Control ◽  
Loop Heat Pipe ◽  
Set Point

Steady State Modeling of LHP and Analysis

2010 ◽  
Author(s):  
Yan Chen ◽  
Lin Cheng ◽  
Gongming Xin ◽  
Tao Luan
Keyword(s):  
Steady State ◽  
Ambient Temperature ◽  
Heat Pipe ◽  
Heat Sink ◽  
Heat Load ◽  
Operating Temperature ◽  
Working Fluid ◽  
Loop Heat Pipe ◽  
Heat Sink Temperature ◽  
Transition Heat

The loop heat pipe (LHP) was invented in Russia in the early 1980’s. It is a two-phase heat transfer device that utilizes the evaporation and condensation of a working fluid to transfer heat, and the capillary force developed in fine porous wicks to circulate the fluid. The temperature of LHP evaporator as functions of the heat load, sink temperature, ambient temperature is an important parameter which can reflect the performance of an LHP. Many factors can affect the LHP operating temperature and which can be divided into two parts: external and internal. The external factors including heat sink temperature, ambient temperature, fluid forces, the position between heat source and heat sink and the heat exchange between LHP and ambient. The internal factors related to the design and structure of the LHP, for example, the charging amount of the working fluid and the distribution status of the liquid phase during the LHP operating. Based on Sinda/Fluint software an ammonia-stainless steel steady state model of loop heat pipe was established, the impacts on the LHP operating temperature induced by alterable heat loads under 3 operating cases (the different position between evaporator and condenser, the changing of ambient temperature and the changing of heat sink temperature) were analyzed and conclusions were made. Changing the position between evaporator and condenser has a significant influence on the LHP operating temperature. Anti-gravity operation will reduce the performance of the LHP, this phenomenon is obviously in low heat load range. Further more, increasing of fluid pressure drop in the loop will induce decreasing of the LHP performance. The temperature difference between ambient and heat sink will influence the transition heat load (from variable conductance mode to fixed conductance mode), the bigger the temperature difference the higher the transition heat load.

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