Performance of a serpentine heat exchanger: Part I – Effectiveness and heat transfer characteristics

San, Jung‐Yang; Lin, Gean-Sheng; Pai, Kai-Li

doi:10.1016/j.applthermaleng.2009.04.007

Cited by 13 publications

(5 citation statements)

References 19 publications

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“…In the equation, A total is the total area of heat transfer of the PCHE, C min is the smaller one between heat capacity of cold and hot fluid, c p,c is the heat capacity of cold fluid. Similar to other literature analysis, the usual heat exchanger effectiveness ε is defined as the relation function between C r and NTU, as shown in Equation (11) and can be simplified to Equation (12) [33]:…”

Section: Operations and Data Analysis Of Experimentationsmentioning

confidence: 99%

Performance Analysis of a Printed Circuit Heat Exchanger with a Novel Mirror-Symmetric Channel Design

et al. 2021

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The printed circuit heat exchanger (PCHE) is a promising waste heat recovery technology to improve energy efficiency. The current investigation presents the experimental results on the thermal performance of a novel PCHE for low-temperature waste heat recovery. The novel PCHE was manufactured using precision machining and diffusion bonding. The thermal performances, such as effectiveness and NTU values at different temperatures, are evaluated, and water is used as a working fluid. The experimental results indicate that the PCHE’s effectiveness is around 0.979 for an inlet flow temperature of 95 °C. The predominant factors affecting the thermal performance of the PCHE are the inlet flow temperature and the flow rate of the working fluid. In addition, a comparison of the experimental results and the literature shows that the effectiveness of the PCHE is better than the others, which have fewer layers of PCHE fins.

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Section: Operations and Data Analysis Of Experimentationsmentioning

confidence: 99%

Performance Analysis of a Printed Circuit Heat Exchanger with a Novel Mirror-Symmetric Channel Design

et al. 2021

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“…It has been estimated that it may exceed 10 times the value of heat transfer coefficient [12]. However, the number of tubes has a negligible effect on the efficiency of the heat exchanger [13], but important issue is the distance between the cross located ribs in the heat exchanger, which should be increased [14]. However, a properly selected system affects not only the heat transfer process with the ambient, but also the efficiency of the refrigerators.…”

Section: Introductionmentioning

confidence: 99%

Free convection on a refrigerator’s condenser

Orzechowski

Stokowiec

2014

EPJ Web of Conferences

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Abstract. The paper presents the measurement of heat transfer coefficient for the refrigerator's condenser in free convection regime. The water was pumped through the steel coils of heat exchanger with a constant flow rate and its temperature was kept at a demanded value by means of ultrathermostat. The research was conducted in stationary conditions which were controlled by a continuous measurement of the water temperature at inflow and outflow to the heat exchanger. The temperature distribution at the external condenser surface was registered by means of an infrared camera. Single elements used to the analysis were selected using the thermogram registered. In free convection regime and in case of small temperature change the heat transfer coefficient value can be calculated by comparing the measured temperature area with analytical solution describing one-dimensional temperature distribution along the rib. The accuracy of the proposed method for measuring the heat transfer coefficient was examined by comparing the heat transferred to the air and the heat lost by water flowing through the spiral of heat exchanger. An error between these two parameters is about 6%.

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“…The influence of the flow inlet condition on the local mass transfer characteristics is examined. San et al (2009) measure the heat transfer and friction data on the channel-flow side of a small-scale prototype of the serpentine heat exchanger. Abed et al (2015) investigate the characteristics of laminar flow and forced convection heat transfer in a HFF 31,6 square cross-section serpentine microchannel.…”

Section: Variable Bend Amplitudementioning

confidence: 99%

Numerical analysis of the flow and heat transfer characteristics in serpentine microchannel with variable bend amplitude

Zhang

Liu

2020

HFF

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Purpose This study aims to propose the increase of heat dissipation requirements of modern electronic equipment and the fast development of micro-scale manufacturing technologies. The heat transfer mechanism is studied in-depth, especially for its pattern of secondary flow caused by the repeated inversion of centrifugal force. Effects of η on the frictional pressure drop and average Nusselt number are studied and the performance of such microchannel heat sink with various bend amplitudes is comprehensively evaluated. These results can provide important insight into the optimal design of this novel design configuration for microelectronics cooling. Design/methodology/approach A three-dimensional model based on the finite volume approach and SIMPLEC algorithm is performed to test an innovative serpentine microchannel, which behaves differently from conventional serpentine microchannel due to the significant effect of centrifugal force inversion. Findings The effect of centrifugal force significantly influences the flow and thermal fields which are responsible for the enhancement in heat transfer coefficient. The number, size and intensity of vortices increase with increasing Re, and the vortices are reformed at every change of the geometry in a periodic fashion. The serpentine microchannel studies more effectively at larger bend amplitude. Pressure fluctuations and temperature variation are greater with increasing bend amplitude. Practical implications Several techniques have been developed to augment single-phase convective heat transfer in channels. One technique is to use a serpentine channel that enhances the heat transfer due to flow mixing and periodic interruption of thermal boundary layers. This technique has been applied to micro-heat exchangers, thermal regenerators and mini/microreactors. Social implications The optimal design of this novel design configuration for microelectronics cooling can be attained. It will become an effective cooling technology for solving the increasing of heat dissipation requirements of modern electronic equipment. Originality/value The flow and heat transfer characteristics are first presented for the circular serpentine microchannel made up of alternate U-bends without interposed straight segments. The present study first examines the effect of such centrifugal force inversion on velocity contour, pressure distribution and temperature distribution. The patterns of secondary flow along the flow passage caused by the repeated inversion of centrifugal force are further studied in depth. The effect of bend amplitude on the flow and heat transfer is explored and the performance of such microchannel heat sink has been comprehensively evaluated.

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Performance of a serpentine heat exchanger: Part I – Effectiveness and heat transfer characteristics

Cited by 13 publications

References 19 publications

Performance Analysis of a Printed Circuit Heat Exchanger with a Novel Mirror-Symmetric Channel Design

Performance Analysis of a Printed Circuit Heat Exchanger with a Novel Mirror-Symmetric Channel Design

Free convection on a refrigerator’s condenser

Numerical analysis of the flow and heat transfer characteristics in serpentine microchannel with variable bend amplitude

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