Mathematical Modeling for Predicting Steady State and Transient Characteristics of Reservoir Embedded Looped Heat Pipe (RELHP)

Ogushi, Tetsuro; Haga, Seiji; Ishikawa, Hiroaki; Yao, Akira; Miyasaka, Akihiro; Noda, Hiroyuki

doi:10.4271/2001-01-2239

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…In Japan, a few researches on the LHP have been reported. Ogushi et al (3) developed a reservoir embedded LHP (RELHP), in which the reservoir is embodied in its wick core. The RELHP was installed in the Engineering Test Satellite (ETS-VIII) launched in 2006, and the performance was demonstrated in orbit.…”

Section: Introductionmentioning

confidence: 99%

Study on Thermal Performances of a Small Loop Heat Pipe

Nagano

Nagai

Fukuyoshi

et al. 2008

JTST

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This paper describes thermal performance of a small loop heat pipe device in an atmospheric condition. A comprehensive test program including start-up, power step up, power cycle and low power tests was performed. The effects of gravity on start-up and heat transport capability were also evaluated. An analytical model for the loop was developed to predict and evaluate the steady state operating performance. The test results demonstrated the robustness of the LHP. The analytical results showed good agreement with the test results except at the low power region. The feasibility of loop temperature control through compensation chamber temperature control was also experimentally demonstrated.

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Section: Introductionmentioning

confidence: 99%

Study on Thermal Performances of a Small Loop Heat Pipe

Nagano

Nagai

Fukuyoshi

et al. 2008

JTST

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“…Also, considering that the heat transfer coefficient for natural convection [7] between the liquid in the reservoir and the wick's inner surface can be estimated at several hundred to a thousand W/(m 2 K) based on component dimensions and temperature differences, we fixed h Li at 1000 W/(m 2 K)…”

Section: Analysis Modelmentioning

confidence: 99%

Study on heat transfer characteristics of reservoir embedded loop heat pipe (1st report, Influence of evaporator orientation against gravity and charged liquid weight on heat transfer characteristics)

Ishikawa

Ogushi

Nomura

et al. 2007

Heat Trans. Asian Res.

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High‐powered satellites need larger heat rejection areas. A deployable radiator is one of the key technologies for a high‐powered satellite bus. A Reservoir Embedded Loop Heat Pipe (RELHP) is a two‐phase heat transfer device that constitutes a deployable radiator. RELHP has an evaporator core which is used as a liquid reservoir to enhance operational reliability. This paper presents the heat transport characteristics of a RELHP under changing evaporator orientation against gravity and charged ammonia weight by experiment and calculation. Liquid slug position in the reservoir has a great influence on heat transport characteristics, caused by changing heat transfer coefficients between returned liquid into the evaporator and vapor in the reservoir. © 2007 Wiley Periodicals, Inc. Heat Trans Asian Res, 36(3): 143– 157, 2007; Published online in Wiley InterScience (http://www.interscience.wiley.com). DOI 10.1002/htj.20150

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“…We have previously developed a reservoir embedded loop heat pipe (RELHP) for application as the deployable radiator that will be installed on the Engineering Test Satellite VIII (ETS-VIII) [4][5][6][7][8]. That system is designed to improve the reliability of operation by incorporating a reservoir for the liquid inside the evaporator and forming a groove on the inner surface of the wick in the axial direction to ensure that the wick is never dry, even under zero-gravity conditions.…”

Section: Heat Transfer-asian Research 38 (2) 2009mentioning

confidence: 99%

Study on heat transfer characteristics of reservoir embedded loop heat pipe (Influence of condenser cooling method on heat transfer characteristics)

Ishikawa

Nomura

Ogushi

et al. 2008

Heat Trans. Asian Res.

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Japan Aerospace Exploration Agency, JapanAs heat generation in satellites increases, securing sufficient radiator panel area is an important problem. Deployable radiators, whose radiator panels are deployed post-launch in space to increase the effective radiator panel area of the satellite, is becoming an important thermal control technology. A reservoir embedded loop heat pipe (RELHP) is applied to the deployable radiator for a thermal transport device. This paper presents the heat transport dynamic characteristics of a RELHP using a radiant cooling condenser and liquid forced convection cooling condenser by an experimental study. It was found that heat leak into the liquid line, flexible line, and reservoir increases the length of the sub-cooling region in the condenser. In the case of the radiant cooling condenser, the sub-cooling region length is shorter than that of a liquid forced convection cooling condenser. Furthermore, vapor temperature is mainly decided by the radiation capacity of the radiator panel, because liquid temperature returned into the evaporator rises with an increase in radiator panel temperature. In addition, time length from start-up until steady state is greater than the liquid forced convection cooling condenser case, because the radiator panel has a large heat capacity.

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Mathematical Modeling for Predicting Steady State and Transient Characteristics of Reservoir Embedded Looped Heat Pipe (RELHP)

Cited by 12 publications

References 8 publications

Study on Thermal Performances of a Small Loop Heat Pipe

Study on Thermal Performances of a Small Loop Heat Pipe

Study on heat transfer characteristics of reservoir embedded loop heat pipe (1st report, Influence of evaporator orientation against gravity and charged liquid weight on heat transfer characteristics)

Study on heat transfer characteristics of reservoir embedded loop heat pipe (Influence of condenser cooling method on heat transfer characteristics)

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