Mathematical Modeling of the Transient Operating Characteristics of a Low-Temperature Heat Pipe

Chang, Won Soon; Colwell, Gene T.

doi:10.1080/01495728508961848

Cited by 43 publications

(5 citation statements)

References 3 publications

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“…Therefore, it is necessary to modify the q FHP term in Equation ( 17) to account for the dynamic thermal characteristics of the FHP. Mathematical models for the heating and cooling dynamic processes of flat plate heat pipes have been established in the literature and experimentally validated [42,43].…”

Section: Correction Of the Heat Flux Throughout The Fhpmentioning

confidence: 99%

A Novel Quick Temperature Prediction Algorithm for Battery Thermal Management Systems Based on a Flat Heat Pipe

Li,

Xie,

et al. 2024

Batteries

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Predicting the core temperature of a Li-ion battery is crucial for precise state estimation, but it is difficult to directly measure. Existing quick temperature-predicting approaches can hardly consider the thermal mass of complex structure that may cause time delays, particularly under high C-rate dynamic conditions. In this paper, we developed a quick temperature prediction algorithm based on a thermal convolution method (TCM) to calculate the core temperature of a flat heat pipe-based battery thermal management system (FHP-BTMS) under dynamic conditions. The model could predict the core temperature rapidly through convolution of the thermal response map which contains full physical information. Firstly, in order to obtain a high fidelity spatio-temporal temperature distribution, the thermal capacitance-resistance network (TCRN) of the FHP-BTMS is established and validated by constant and dynamic discharging experiments. Then, the response map of the core temperature motivated by various impulse heat sources and heat sinks is obtained. Specifically, the dynamic thermal characteristics of an FHP are discussed to correct the boundary conditions of the TCM. Afterwards, the temperature prediction performances of the TCM and a lumped model under different step operating conditions are compared. The TCM results show a 70–80% accuracy improvement and better dynamic adaptivity than the lumped model. Lastly, a vertical take-off and landing (VTOL) profile is employed. The temperature prediction accuracy results show that the TCM can maintain a relative error below 5% throughout the entire prediction period.

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Section: Correction Of the Heat Flux Throughout The Fhpmentioning

confidence: 99%

A Novel Quick Temperature Prediction Algorithm for Battery Thermal Management Systems Based on a Flat Heat Pipe

Li,

Xie,

et al. 2024

Batteries

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show abstract

“…Investigations on the transient operation of heat pipes have been reported for various external operating conditions [10][11][12][13][14][15][16]. Chang et al [10] presented a finite difference analysis for predicting the transient operating characteristics of low temperature heat pipes. In their analysis, the convection heat transfer in the wick was neglected, assuming pure conduction in the wick.…”

Section: Introductionmentioning

confidence: 99%

A quasi-3D analysis of the thermal performance of a flat heat pipe

Carbajal

Sobhan

Peterson

et al. 2007

International Journal of Heat and Mass Transfer

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“…The thermal performance were calculated numerically [8,9] or analytically [10] for simple configurations by considering an equivalent thermal conductivity for the capillary structure. Transient models have also been developed [11][12][13]. Obviously, it is possible to increase the sophistication of the simulations.…”

Section: Introductionmentioning

confidence: 99%

A general analytical model for the design of conventional heat pipes

Lips

Lefèvre

2014

International Journal of Heat and Mass Transfer

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An analytical solution is presented for the 3D temperature field and the 2D pressure and velocity fields within a conventional heat pipe either flat or cylindrical. Several heat sources and heat sinks can be located on the heat pipe. The model is a generalisation of a previous analytical solution developed for a flat plate heat pipe fully insulated on one of its face. The equivalent thermal conductivity and the permeability are the main parameters of the capillary structure. A Fourier series expansion is used to solve the 3D heat conduction equation in the heat pipe wall. A similar approach enables to solve the 2D balance equations within the liquid and the vapour. The thermal and the hydrodynamic models are coupled together. The model can be used to determine the thermal resistance and the different limits of the heat pipe. As the model is analytically derivable, it is straightforward to use it to optimize heat pipe parameters and the locations of the heat sources and the heat sinks. An inverse formulation can be derived easily to estimate the capillary structure parameters using wall temperature measurements. In the case of the classical problem of a cylindrical heat pipe heated on one side and cooled on the other side, the simplification of the general solution enables to establish the well-known theory of heat pipe modelling, which validates the approach.

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Mathematical Modeling of the Transient Operating Characteristics of a Low-Temperature Heat Pipe

Cited by 43 publications

References 3 publications

A Novel Quick Temperature Prediction Algorithm for Battery Thermal Management Systems Based on a Flat Heat Pipe

A Novel Quick Temperature Prediction Algorithm for Battery Thermal Management Systems Based on a Flat Heat Pipe

A quasi-3D analysis of the thermal performance of a flat heat pipe

A general analytical model for the design of conventional heat pipes

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