Precision Temperature Control with a Loop Heat Pipe

2005 ◽  
Author(s):  
Frank Bodendieck ◽  
Reinhard Schlitt ◽  
Oliver Romberg ◽  
Konstantin Goncharov ◽  
Vasili Buz ◽  
...  
Keyword(s):  
Heat Pipe ◽  
Temperature Control ◽  
Loop Heat Pipe ◽  
Precision Temperature ◽  
Precision Temperature Control

Design of a Variable Conductance Heat Pipe for a Photonic Component

2006 ◽  
Author(s):  
Martin Cleary ◽  
Ronan Grimes ◽  
Marc Hodes ◽  
Mark T. North
Keyword(s):  
Power Consumption ◽  
Ambient Temperature ◽  
Heat Pipe ◽  
Temperature Control ◽  
Heat Load ◽  
Passive Control ◽  
Evaporator Temperature ◽  
Ambient Temperatures ◽  
Precision Temperature ◽  
Precision Temperature Control

Thermoelectric modules (TEMs) are widely used to provide precision temperature control in photonic applications. A problem with TEMs, however, is that when they are subjected to a large range of ambient temperatures the power of consumption of TEMs can be excessive. This study proposes the replacement of the TEM based approach with a variable conductance heat pipe (VCHP). VCHPs offer reduced power consumption compared to TEMs whilst still offering precision temperature control of the device. Using existing theory this paper investigates the use of wicked and non-wicked reservoirs and the effect of reservoir volume on the sensitivity of the evaporator temperature to changes in both ambient temperature and heat load for both heated and unheated reservoirs. The paper also investigates the effectiveness of the use of a steel collar between the reservoir and the condenser in reducing the heat loss to ambient. The paper concludes that passive control of evaporator temperature can be achieved for the case of a variable heat load, but not for the case of a variable ambient temperature, that evaporator temperature is more sensitive to reservoir temperature for a wicked than a non-wicked reservoir, and that with the use of a steel collar between the reservoir and the condenser a VCHP provides a significant power consumption reduction when compared to a TEM.

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

Realization of an ultra-high precision temperature control in a cryogen-free cryostat

2018 ◽  
Vol 89 (10) ◽  
pp. 104901 ◽  
Author(s):  
Bo Gao ◽  
Changzhao Pan ◽  
Yanyan Chen ◽  
Yaonan Song ◽  
Haiyang Zhang ◽  
...  
Keyword(s):  
High Precision ◽  
Temperature Control ◽  
Precision Temperature ◽  
Precision Temperature Control

High precision temperature control for projection lens with long time thermal response constant

2013 ◽  
Vol 21 (1) ◽  
pp. 108-114 ◽  
Author(s):  
秦硕 QIN Shuo ◽  
巩岩 GONG Yan ◽  
袁文全 YUAN Wen-quan ◽  
杨怀江 YANG Huai-jiang
Keyword(s):  
High Precision ◽  
Temperature Control ◽  
Thermal Response ◽  
Projection Lens ◽  
Precision Temperature ◽  
Long Time ◽  
Precision Temperature Control

A precision temperature control approach for piezoelectric jet dispenser

Optik ◽  
2019 ◽  
Vol 183 ◽  
pp. 273-276 ◽  
Author(s):  
Can Zhou ◽  
Weiqun Chen ◽  
Zhipeng Bao ◽  
Guiling Deng
Keyword(s):  
Temperature Control ◽  
Control Approach ◽  
Precision Temperature ◽  
Precision Temperature Control

High-Precision Temperature Control for GRADFLEX

2006 ◽  
Author(s):  
Matthias Boehme ◽  
Jürgen Moors-Nitschmann ◽  
Lutz Günther ◽  
Ralf Greger ◽  
Antonio Verga
Keyword(s):  
High Precision ◽  
Temperature Control ◽  
Precision Temperature ◽  
Precision Temperature Control

Effect of Sink Temperature on the Stability of the Pressure-Controlled Loop Heat Pipe

2019 ◽  
Vol 141 (9) ◽  
Author(s):  
Wukchul Joung ◽  
Joohyun Lee
Keyword(s):  
Heat Pipe ◽  
Temperature Control ◽  
Control Technique ◽  
Loop Heat Pipe ◽  
Heat Leak ◽  
Start Up ◽  
Recent Emergence ◽  
Compensation Chamber ◽  
The Stability ◽  
Pressure Controlled

Recently, a novel temperature control technique utilizing the unique thermohydraulic operating principles of the pressure-controlled loop heat pipes (PCLHPs) was proposed and proved its effectiveness, by which a faster and more stable temperature control was possible by means of the pressure control. However, due to its recent emergence, the proposed hydraulic temperature control technique has not been fully characterized in terms of the various operating parameters including the sink temperature. In this work, the effect of the sink temperature on the loop heat pipe (LHP)-based hydraulic temperature control was investigated to improve the stability of the proposed technique. Start-up characteristics and transient responses of the operating temperatures to different pressure steps and sink temperatures were examined. From the test results, it was found that there was a minimum sink temperature, which ensured a steady-state operation after the start-up and a stable hydraulic temperature control with the increasing pressure steps, due to the unstable balance between the heat leak and the liquid subcooling in the compensation chamber at low sink temperatures. In addition, the range of the stable hydraulic temperature control was extended with the increasing coolant temperature due to the decreased heat leak, which resulted in the increased pressure difference between the evaporator and the compensation chamber. Therefore, it was found and suggested that for a stable hydraulic temperature control in an extended range, it was necessary to operate the PCLHP at higher sink temperatures than the low limit.

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