Heat transfer predictions for helical oscillating heat pipe heat exchanger: Transient condition

Siriwan, N.; Chompookham, Teerapat; Ding, Yulong; Rittidech, S.

doi:10.1007/s12206-017-0642-y

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…Thus, the working fluid can affect the heat transfer and the heat flux also. Where the results were consistent with the results of the numerical model of the HOHP obtained by (Siriwan et al 2017) at filling ratio of 80% by total volume. When replacing the working fluid, ethanol is used instead of water which increases the heat transfer rate.…”

Section: Effect Of Working Fluidsupporting

confidence: 89%

“…The flow patterns of each working fluid were different. Afterward, (Siriwan et al 2017) studied the heat transfer predictions for helical oscillating heat pipe heat exchanger in transient condition. They found that the transient heat transfer profiles of the HOHP from the numerical model were successfully compared with the results from the experimental data which utilizes the concept of heat transfer increments in the HOHP during transient operation.…”

Section: Introductionmentioning

confidence: 99%

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Correlation for Predicting Heat Transfer Characteristics of A Helical Oscillating Heat Pipe (HOHP) at Normal Operating Conditions

Donmuang

Chompookham

2020

Int. J. Renew. Energy Dev.

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The helical oscillating heat pipe (HOHP) is a high heat transfer heat exchanger with high flexibility in its installation and can therefore be used in a wide variety of applications. In this study, the effect of various parameters on the heat transfer rates of HOHP were used to establish a correlation equation for use in the heat flux prediction, the dimensionless parameters studied were rv/rl, Bo, Nu, We, Ja, Pr, Fr, Co, Ga, Bi, Wo, Oh, and Ku. Experiments were conducted to find out their effects on the heat transfer rates of copper HOHP with internal diameters were 2.03, 3.5, and 4.5 mm. The lengths of evaporator and condenser sections were equal at 1500, 2000, and 2500 mm. The pitch coils were 10, 15, and 20 mm. The working fluids used were R134a, ethanol, and water with the filling ratios were 30%, 50%, and 80% of the total internal volume. The temperature of evaporator section were varied between 60, 70, and 80°C within normal operating conditions in a vertical position. The results of the experiment showed that the internal diameter, lengths of evaporator/condenser sections, pitch coil, type of working fluid, filling ratio and temperature of evaporator section affected the heat transfer rates of the HOHP. The results of dimensionless parameters can establish the correlation equation to predict the heat flux for the HOHP as shown in this paper. In addition, the results of this research can be applied in the designing and construction of HOHP heat exchangers.

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Section: Effect Of Working Fluidsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Correlation for Predicting Heat Transfer Characteristics of A Helical Oscillating Heat Pipe (HOHP) at Normal Operating Conditions

Donmuang

Chompookham

2020

Int. J. Renew. Energy Dev.

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“…Raju et al [15] and Lele et al [16] established the modelling of a helical coil heat exchanger with COMSOL software, respectively, and studied the heat transfer characteristics of the exchanger. In [17][18][19][20][21][22][23], the numerical simulations on coil heat exchangers were conducted and the optimizations of exchangers were explored.…”

Section: Introductionmentioning

confidence: 99%

Study of a Coil Heat Exchanger with an Ice Storage System

Yan

Yang

et al. 2017

Energies

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Abstract:In this study, a coil heat exchanger with an ice storage system is analyzed by theoretical analysis, numerical analysis, and experimental analysis. The dynamic characteristics of ice thickness variation is studied by means of unstable heat conduction theory in cylindrical coordinates, and the change rule of the ice layer thickness is obtained. The computational fluid dynamics method is employed to simulate the flow field and ice melting process of the coil heat exchanger. The effect of the agitator height on the flow characteristics and heat transfer characteristics is investigated. The numerical results show that the turbulence intensity of the fluid near the wall of the heat exchanger is the largest with an agitator height of 80 mm. Furthermore, the process of ice melting is analyzed. The ice on the outer side of the evaporator tube close to the container wall melts faster than the inner side and this agrees well with the experimental result. The experimental study on the process of the operational period and deicing of the coil heat exchanger is conducted and the temperature variation curves are obtained by the arrangement of thermocouples. It is found that the temperature of the evaporating tube increases with increasing height in the process of ice storage.

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