Development of Advanced Tools for Cryogenic Integration

Bugby, D.; Marland, B.; Stouffer, Chuck; Kroliczek, E. J.

doi:10.1063/1.1774895

Cited by 12 publications

(2 citation statements)

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“…So far, several types of CLHPs employing different auxiliary measures to realize the supercritical startup have been developed, such as the gravity-assisted method [16], the secondary evaporator method [17][18][19][20][21][22], the auxiliary loop method [23][24][25][26][27][28] and the capillary pump method [29][30], as reviewed in our previous paper [31]. Because the CLHP employing the auxiliary loop method can realize the supercritical startup in space microgravity environment, and can manage the parasitic heat load effectively with a relatively high heat transport capacity, it is the most suitable for space applications and is selected as the object of study in this work.…”

Section: Introductionmentioning

confidence: 99%

“…The CLHP could operate at a temperature range of 20-30K, and a maximum heat transport capability of 10W over a transport distance of 2.5m was obtained with a 80K shroud [15]. To solve important problems in cryogenic integration, Bugby et al [24,25] developed three CLHPs: an across-gimbal CLHP, a short and a long transport length miniaturized CLHP. The across-gimbal CLHP employed nitrogen as the working fluid with a heat transport range of 2-20W.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on the supercritical startup of cryogenic loop heat pipes with redundancy design

Guo

Lin

Bai

et al. 2016

Energy Conversion and Management

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Abstract:Cryogenic loop heat pipe (CLHP) is one of the key components in the future space infrared 10 exploration system, which enables effective and efficient cryogenic heat transport over a long distance with a 11 flexible thermal link. To realize reliable and long life operation, a CLHP-based thermal control system with 12 redundancy design was proposed in this work, where two nitrogen-charged CLHPs were employed to provide 13 cryocooling at 80-100K. This study focused on the supercritical startup of the CLHPs with redundancy design, 14and an extensive experimental study under four possible working modes was conducted. Experimental results 15showed that with 2.5W applied to the secondary evaporator, each CLHP could realize the supercritical startup 16 successfully in the normal working mode; however, the required time differed a lot because the difference in the 17 transport line diameter significantly affected the cryocooling capacity to the primary evaporator. In the backup 18 conversion mode, instant switch of the two primary evaporators may cause an operation failure, and an auxiliary 19 operation of the secondary evaporator in advance was necessary to make the primary liquid line filled with liquid. 20In the malfunction conversion mode, the simulated infrared detector had to be first shut down, but the time needed 21 for the backup CLHP to realize the supercritical startup became obviously shorter than that in the normal working 22 mode, because the primary evaporator of the backup CLHP was always in a cryogenic state. In the dual operation 23 mode, the two CLHPs could realize the supercritical startup simultaneously, but a temperature oscillation 24 phenomenon was observed, which can be eliminated by increasing the heat load applied to the secondary 25 evaporator. 26

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