Loop heat pipe technology for cooling computer servers

Zimbeck, Walter; Slavik, G.; Cennamo, John; Kang, Sukhvinder; Yun, James; Kroliczek, Ed

doi:10.1109/itherm.2008.4544248

Cited by 27 publications

(6 citation statements)

References 3 publications

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“…The evaporating and condensing sections of the integral HP are in the upper and lower spaces of the same whole (Yang et al, 2009). Integral HP system is further divided into the pulsating integrated HP, the integral HP system with air duct, and the loop HP, whose reliability and feasibility have been proven separately (Lu & Jia, 2016;Maydanik et al, 2009;Zhou et al, 2011;Zimbeck et al, 2008).…”

Section: Independent Heat Pipe Systemmentioning

confidence: 99%

Phase change cooling in data centers: A review

Yuan

Zhou

Pan

et al. 2021

Energy and Buildings

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Section: Independent Heat Pipe Systemmentioning

confidence: 99%

Phase change cooling in data centers: A review

Yuan

Zhou

Pan

et al. 2021

Energy and Buildings

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“…It is determined by the so-called mean void fraction ᾱ, which is time invariant and hence neglects the transient changes of the fluid momentum. According to [27], a value of ᾱ = 0.82 (28) is chosen for the condensation in the LHP.…”

Section: Condensermentioning

confidence: 99%

“…Loop heat pipes (LHPs) are passive, two-phase heat transport systems with their origin in the thermal control of aerospace systems [19]. In recent years, their application has spread to other technology areas such as server systems ( [28], [20]) and automotive systems ( [22], [2]). Their advantage is based on an effective and reliable heat transport with a working fluid between distributed heat sources and heat sinks.…”

Section: Introductionmentioning

confidence: 99%

Dynamic state-space modeling and model-based control design for loop heat pipes

Gellrich¹,

Clara²,

Okraschevski³

et al. 2020

Preprint

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For the thermal control of electronic components in aerospace, automotive or server systems, the heat sink is often located far from the heat sources. Therefore, heat transport systems are necessary to cool the electronic components effectively. Loop heat pipes (LHPs) are such heat transport systems, which use evaporation and condensation to reach a higher heat transfer coefficient than with sole heat conduction. The operating temperature of the LHP governs the temperature of the electronic components, but depends on the amount of dissipated heat and the temperature of the heat sink. For this reason, a control heater on the LHP provides the ability to control the operating temperature at a fixed setpoint temperature. For the model-based control design of the control heater controller, the current LHP state-space model in the literature focuses on the setpoint response without modeling the fluid's dynamics. However, the fluid's dynamics determine the disturbance behavior of the LHP. Therefore, the fluid's dynamics are incorporated into a new LHP state-space model, which is not only able to simulate the LHP behavior under disturbance changes, but is also used for the model-based design of a robust nonlinear controller, which achieves an improved control performance compared to the nonlinear controller based on the previous LHP state-space model.

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“…The main advantages of the LHP are as follows: operating of cooling system in any orientation in space without substantial changing of its characteristics; ability to work in moving systems for large values of g (5 or more); ability to provide a flexible connection between heat supply and heat sink areas. Zimbeck et al (2008) provides information on copper LHP with ceramic wick that use water as the working fluid. These LHP were tested for cooling of processors with a capacity of 100 W. Singh et al (2007) provided data on copper LHP with the evaporator having a disk shape with a diameter of 30 mm and a height of 10 mm.…”

Section: Loop Heat Pipesmentioning

confidence: 99%

Heat Pipes Application in Electronics Thermal Control Systems

Khairnasov¹,

Naumova²

2015

Frontiers in Heat Pipes

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Today widespread usage of cooling systems based on heat pipes contributes significantly to the ensuring of electronics thermal regulating conditions. The use of heat pipes as heat exchangers and heat transfer structural members allows creating a new generation of efficient heat removals on their basis. Today the following areas where heat pipes are widely used can be identified: computer equipment from small computers to large data centers, power electronics, and electronics for special purposes. The article analyzes the current state and prospects of using heat pipes in thermal control system of electronic equipment for ground applications.

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Loop heat pipe technology for cooling computer servers

Cited by 27 publications

References 3 publications

Phase change cooling in data centers: A review

Phase change cooling in data centers: A review

Dynamic state-space modeling and model-based control design for loop heat pipes

Heat Pipes Application in Electronics Thermal Control Systems

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