CPL and LHP Technologies: What are the Differences, What are the Similarities?

Nikitkin, Mikhail; Cullimore, Brent A.

doi:10.4271/981587

Cited by 55 publications

(15 citation statements)

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“…The working fluid mass affects the performance characteristics of the LHP and its start-up behavior [9]. However, an experimental approach to find the optimal fill quantity proved to be the more appropriate solution in this case.…”

Section: Working Fluid Massmentioning

confidence: 99%

Cryogenic Loop Heat Pipes for the Cooling of Small Particle Detectors at Cern

Pereira

Haug

Silva

et al. 2010

AIP Conference Proceedings

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The loop heat pipe (LHP) is among the most effective heat transfer elements. Its principle is based on a continuous evaporation/condensation process and its passive nature does not require any mechanical devices such as pumps to circulate the cooling agent. Instead a porous wick structure in the evaporator provides the capillary pumping forces to drive the fluid [1]. Cryogenic LHP are investigated as potential candidates for the cooling of future small-scale particle detectors and upgrades of existing ones. A large spectrum of cryogenic temperatures can be covered by choosing appropriate working fluids. For high luminosity upgrades of existing experiments installed at the Large Hadron Collider (LHC) (TOTEM) and planned ones (FP420) [2][3] being in the design phase, radiation-hard solutions are studied with noble gases as working fluids to limit the radiolysis effect on molecules detrimental to the functioning of the LHP. The installation compactness requirement of experiments such as the CAST frame-store CCD detector cooling system impels also the design of a compact shaped LHP [4]. This paper reports on the design and experimental results of a general purpose LHP for temperatures as low as 110 K, for which the performances were measured using a Gifford-McMahon (GM) cooler as the cold source, combination envisaged for the cooling of future particle detectors.. CERN-ATS-2010-017January 2010 Abstract CRYOGENIC LOOP HEAT PIPES FOR THE COOLING OF SMALL PARTICLE DETECTORS AT CERNH. Pereira, F. Haug, P. Silva, J. Wu, T. Koettig CERN CH-1211, Geneva, 23, Switzerland ABSTRACTThe loop heat pipe (LHP) is among the most effective heat transfer elements. Its principle is based on a continuous evaporation/condensation process and its passive nature does not require any mechanical devices such as pumps to circulate the cooling agent. Instead a porous wick structure in the evaporator provides the capillary pumping forces to drive the fluid [1]. Cryogenic LHP are investigated as potential candidates for the cooling of future small-scale particle detectors and upgrades of existing ones. A large spectrum of cryogenic temperatures can be covered by choosing appropriate working fluids. For high luminosity upgrades of existing experiments installed at the Large Hadron Collider (LHC) (TOTEM) and planned ones (FP420) [2][3] being in the design phase, radiation-hard solutions are studied with noble gases as working fluids to limit the radiolysis effect on molecules detrimental to the functioning of the LHP. The installation compactness requirement of experiments such as the CAST frame-store CCD detector cooling system impels also the design of a compact shaped LHP [4]. This paper reports on the design and experimental results of a general purpose LHP for temperatures as low as 110 K, for which the performances were measured using a Gifford-McMahon (GM) cooler as the cold source, combination envisaged for the cooling of future particle detectors.

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Section: Working Fluid Massmentioning

confidence: 99%

Cryogenic Loop Heat Pipes for the Cooling of Small Particle Detectors at Cern

Pereira

Haug

Silva

et al. 2010

AIP Conference Proceedings

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“…Separating the compensation reservoir from the remaining part of the system makes the CPL more tolerant to heat loss, which facilitates its installation. Detailed descriptions of CPL systems can be found in [10][11], for instance.…”

Section: Introductionmentioning

confidence: 99%

Capillary Pumped Loop as a Tool for Collecting Large Heat Fluxes from Electronic Devices On Warships

Mikielewicz

Szymański

2017

Polish Maritime Research

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“…Many different designs of LHPs and CPLs have been developed and tested, (Maydanik, 2005;Nikitkin and Cullimore, 1998;Goncharov and Kolesnikov, 2002;Ku, 1999) and such devices have been used as key apparatuses of thermal control of spacecrafts such as GLAS, EOS-Chemistry, GOES and SWIFT. While LHP technologies have reached a certain level of maturity, many issues still remain as subjects of intensive research.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of Loop Heat Pipes with Cylindrical Evaporator and Integral Reservoir for Space Application

Vlassov¹,

Sousa²,

Riehl³

2008

AIP Conference Proceedings

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Abstract. Design optimization of a LHP system for a space application is considered. The system is composed of the LHP itself, an interface with the heat source (saddle) and a radiator. The criterion is minimal system mass while meeting the operational requirements. The optimization is performed with simultaneous consideration of hot and cold conditions with respect to imposed heat loads to the evaporator and external heat fluxes over the radiator panel. The design parameters of the system optimized are the active length of the evaporator, internal and external diameters of the primary wick, volume and size of the reservoir, thickness and width of the saddle, diameters and tube thickness of the transport lines and condenser, length of the condenser, dimensions of the radiator panel and the amount of the LHP working fluid charged. The LHP mass and optimal design parameters are obtained for three working fluids: armnonia, propylene and acetone; a comparative study of the optimal mass characteristics is performed. Fixed parameters are the required values of transferred heat loads, incident external heat fluxes for the hot and cold cases, length of the transport lines, material and fluid properties. Constraints include temperature limits for the attached equipment and the capillary limits of the LHP. A special steady state mathematical model was developed for the calculation of the LHP performance parameters and a global search metaheuristic, called Generalized Extremal Optimization (GEO), is used as the optimization tool.

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CPL and LHP Technologies: What are the Differences, What are the Similarities?

Cited by 55 publications

References 0 publications

Cryogenic Loop Heat Pipes for the Cooling of Small Particle Detectors at Cern

Cryogenic Loop Heat Pipes for the Cooling of Small Particle Detectors at Cern

Capillary Pumped Loop as a Tool for Collecting Large Heat Fluxes from Electronic Devices On Warships

Design Optimization of Loop Heat Pipes with Cylindrical Evaporator and Integral Reservoir for Space Application

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