scholarly journals Influence of refrigerant circuitry arrangement of three-row finned tube evaporator on heat transfer performance under uniform wind speed distribution

2021 ◽  
Vol 766 (1) ◽  
pp. 012081
Author(s):  
Xue Wang ◽  
Ruoyu Wang ◽  
Yu Zhang
Keyword(s):  
Heat Transfer ◽  
Wind Speed ◽  
Heat Transfer Performance ◽  
Finned Tube ◽  
Transfer Performance ◽  
Speed Distribution ◽  
Wind Speed Distribution

scholarly journals Airside Performance of H-Type Finned Tube Banks with Surface Modifications

Energies ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 584 ◽  
Author(s):  
Pradhyumn Bhale ◽  
Mrinal Kaushik ◽  
Jane-Sunn Liaw ◽  
Chi-Chuan Wang
Keyword(s):  
Heat Transfer ◽  
Surface Area ◽  
Heat Transfer Performance ◽  
Finned Tube ◽  
Transfer Performance ◽  
Reference Case ◽  
Weight Saving ◽  
Area Reduction ◽  
Tube Banks ◽  
Surface Area Reduction

The present study numerically investigates some novel modifications to augment the performance of the H-type finned tube banks, which are widely used in waste heat recovery in industries. The imposed modifications upon the original H-type finned tube banks include the following: (1) Design 1 contains some triangular cuts at the edge of the original rectangular fin; (2) Design 2 modifies the original rectangular geometry into a trapezoid shape; (3) Design 3 renders the original rectangular cross-section fin thickness into trapezoid cross-section; and (4) Design 4 changes the original rectangular shape into a circular shape. Based on the simulations, it is found that Design 1 shows barely any improvements in the heat transfer performance and surface area reduction. Design 2 can provide some weight saving and surface area reduction at a slightly inferior heat transfer performance. Design 3 can offer up to 14% improvements in the overall heat transfer performance without any pumping power penalty. Yet, Design 4 provides the maximum weight saving as compared to the original reference case. With 3–9% lesser surface area than the reference case, Design 4 still offers marginally higher heat transfer performance.

Investigation on Heat Transfer Performance and Flow Resistance Characteristics in Finned-Tube Heat Exchangers With Different Vortex Generator Positions

2019 ◽  
Vol 141 (9) ◽  
Author(s):  
Wang Qiang ◽  
Qian Zuoqin ◽  
Cheng Junlin ◽  
Ren Jie ◽  
Huang Weilong
Keyword(s):  
Heat Transfer ◽  
Thermal Performance ◽  
Heat Exchangers ◽  
Flow Resistance ◽  
Heat Transfer Performance ◽  
Finned Tube ◽  
Transfer Performance ◽  
Wake Region ◽  
Local Pressure ◽  
Comprehensive Performance

The numerical simulation was carried out to investigate mechanism of the heat transfer enhancement in the fin-and-tube heat exchangers. As known, the vortex generators (VGs) were widely used to improve the thermal performance with bad flow resistance characteristics and led to bad comprehensive performance. This paper aims to expound the mechanism of thermal hydraulic characteristics and explore the effect of VGs position on the comprehensive performance. Three types of fins (type 1, type 2, and type 3) were discussed in this paper. The j factor, f factor, and performance evaluation (PEC) of three types of VGs in different positions were discussed and compared. Based on the numerical results, a detailed description of the effect of three types of VGs on the heat transfer performance and flow resistance characteristics was presented at different Reynolds number in the range between 1300 and 2000. In addition, local velocity distribution, local temperature distribution, and local pressure drop distribution were analyzed and discussed. And the effect of VG angle on the thermal performance and flow resistance was presented. It can be concluded that the main heat transfer occurred in the region before the tube, and the wake region behind the tube was harmful to improve the thermal performance and reduce the flow resistance. Besides, VG in the wake region was obviously beneficial to the enhancement of the thermal performance with less energy loss.

Heat Transfer Testing of Enhanced Finned-Tube Bundles Using the Single-Blow Technique

2003 ◽  
Author(s):  
J. E. O’Brien ◽  
M. S. Sohal ◽  
P. C. Wallstedt
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Heat Transfer Performance ◽  
Performance Testing ◽  
Finned Tube ◽  
Test Facility ◽  
Transfer Performance ◽  
Number Range ◽  
Longitudinal Vortices ◽  
Tube Bundles

A single-blow test facility has been developed at the INEEL for pressure-drop and heat transfer performance testing of heat exchanger finned-tube bundles. Initial testing in the facility has been aimed at evaluating several enhanced heat transfer geometries to be used with individually finned tubes in which winglet vortex generators have been punched into the fin surfaces at specific locations. The winglets interact with the air flow to create longitudinal vortices that enhance fin-surface heat transfer performance with minimal increase in pressure drop. Results of two initial studies indicate heat transfer enhancement levels of 20–30% across the tested Reynolds number range (100–3000), with an increase in pressure drop of only 4–12%, over the same range.

Numerical Simulation on Finned Heat Pipe under the Condition of Convection

2014 ◽  
Vol 716-717 ◽  
pp. 582-584
Author(s):  
Xiao Hui Zhong ◽  
Ting Ting Xue ◽  
Chao Liu
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Wind Speed ◽  
Mixed Convection ◽  
Heat Pipe ◽  
Heat Transfer Performance ◽  
Horizontal Wind ◽  
Transfer Performance ◽  
Horizontal Wind Speed ◽  
Fin Spacing

This paper intends to use Gambit software to set up different mathematical models for the finned heat pipe, separately from the perspectives of three-dimensional, steady-state, natural and mixed convection. And then, it also uses Fluent software to do numerical simulation on the influence of different fin spacing, fin height and fin angle under the conditions of natural convection and different horizontal wind speed on heat transfer performance of fin under the conditions of mixed convection. The results show that, under the condition of natural convection, increasing the fin spacing, fin height and fin angle with the horizontal angle can improve the heat transfer performance of finned heat pipe; Under the condition of mixed convection, with the increase of horizontal wind speed, on which the horizontal wind speed has a greater influence, the heat transfer rate and heat transfer coefficient of fin present approximately linear increase.

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