Study on comprehensive performance evaluation for condensation heat transfer inside the micro-fin tube

Liu, Wei

doi:10.1177/1687814020940096

Cited by 3 publications

(2 citation statements)

References 35 publications

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“…Their results suggested that micro-fin tubes could drastically increase heat transfer coefficients. Wei et al [7] developed a comprehensive performance model of heat transfer tubes and experimentally evaluated previous correlations. They found that the heat transfer coefficient and pressure drop both increase with the mass flux and condensation temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance of a Novel Non-Tubular Absorber with Extended Internal Surfaces for Concentrated Solar Power Receivers

Yao

2023

Energies

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A non-tubular prototype cavity receiver absorber with extended internal surfaces (fins) is proposed to enhance heat transfer in Stirling engine-based Concentrated Solar Power systems. There is limited research on the realization of downsized absorbers in terms of their design and manufacturing. The objective of the absorber solution proposed in this paper is to address the issue of inadequate comprehension regarding the impacts of the geometric and flow parameters on thermohydraulic efficiency. These impacts are numerically investigated in a 100 mm long heat transfer channel with a 10 mm × 10 mm section. The prototype absorber is fabricated using a wire electrode-discharging manufacturing approach, and is experimentally investigated using the enthalpy method. Numerical results indicate that heat transfer to the working fluid in the novel absorber can reach 482 W at the reasonable cost of 0.391% pressure drop per 100 mm (air flow at 0.0015 kg/s and 5 bar). In the experimental investigation, the prototype realizes a 1113.033 W heat transfer rate at 8 bar and 12 kg/h. This implies that a non-tubular design with extended internal surfaces can increase the internal surface area to enhance heat transfer while downsizing the volume to reduce heat loss.

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Section: Introductionmentioning

confidence: 99%

Thermal Performance of a Novel Non-Tubular Absorber with Extended Internal Surfaces for Concentrated Solar Power Receivers

Yao

2023

Energies

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“…Condensers play important roles in different systems, such as air conditioning [1,2], heat pumping [3], refrigeration [4,5], nuclear [6,7], chemical [8,9], etc. Nowadays, condensers with mini/micro-channels are used instead of conventional channels in many industries [10][11][12][13][14][15]. The main reasons are reducing the size of the condensers, refrigeration charge, required space, and overall cost of the process [16].…”

Section: Introductionmentioning

confidence: 99%

Robust and General Model to Forecast the Heat Transfer Coefficient for Flow Condensation in Multi Port Mini/Micro-Channels

et al. 2022

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A general correlation for predicting the two-phase heat transfer coefficient (HTC) during condensation inside multi-port mini/micro-channels was presented. The model was obtained by correlating the two-phase multiplier, with affecting parameters using the genetic programming (GP) method. An extensive database containing 3503 experimental data samples was gathered from 21 different sources, including a broad range of operating parameters. The newly obtained correlation fits the broad range of measured data analyzed with an average absolute relative deviation (AARD) of 16.87% and estimates 84.73% of analyzed data points with a relative error of less than 30%. Evaluation of previous correlations was also conducted using the same database. They showed the AARD values ranging from 36.94% to 191.19%. However, the GP model provides more accurate results, AARD lower than 17%, by considering the surface tension effects. Finally, the effect of various operating parameters on the HTC was studied using the proposed correlation.

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Numerical Analysis of Heat Transfer and Pressure Drop in Helically Micro-Finned Tubes

et al. 2021

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In this study, the pressure drop and heat transfer characteristics of smooth tube and internal helically micro-finned tubes with two different fin-to-fin height ratios i.e., equal fin height and alternating fin height, are computationally analysed. The tube with alternating fin height is analysed for proof of concept of pressure drop reduction. A single phase steady turbulent flow model is used with a Reynolds number ranging from 12,000 to 54,000. Water is used as working fluid with inlet temperature of 55 °C and constant wall temperature of 20 °C is applied. Friction factor, heat transfer coefficient, Nusselt number, and Thermal Performance Index are evaluated and analysed. The numerical results are validated by comparison with the experimental and numerical data from literature. The results showed that the thermal performance is enhanced due to helically finned tube for a range of Reynolds numbers, but at the expense of increased pressure drop as compared to a smooth tube. The helically finned tube with alternating fin heights showed a 5% decrease in friction factor and <1% decrease in heat transfer coefficient when compared with the equal fin heights tube, making it a suitable choice for heat transfer applications.

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Study on comprehensive performance evaluation for condensation heat transfer inside the micro-fin tube

Cited by 3 publications

References 35 publications

Thermal Performance of a Novel Non-Tubular Absorber with Extended Internal Surfaces for Concentrated Solar Power Receivers

Thermal Performance of a Novel Non-Tubular Absorber with Extended Internal Surfaces for Concentrated Solar Power Receivers

Robust and General Model to Forecast the Heat Transfer Coefficient for Flow Condensation in Multi Port Mini/Micro-Channels

Numerical Analysis of Heat Transfer and Pressure Drop in Helically Micro-Finned Tubes

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