Numerical analysis of heat transfer and fluid flow in a three-dimensional wavy-fin and tube heat exchanger

1997 ◽  
Vol 40 (16) ◽  
pp. 3981-3990 ◽  
Author(s):  
Jiin-Yuh Jang ◽  
Li-Kwen Chen
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Heat Exchanger ◽  
Numerical Analysis ◽  
Three Dimensional ◽  
Tube Heat Exchanger

Influencing Degree of Star-Stop Frequency on Running Efficiency of Ground Source Heat Pump which Using Vertical Buried Pipe

2014 ◽  
Vol 508 ◽  
pp. 141-145
Author(s):  
Xian Fang Hu ◽  
Yu Yun Li ◽  
Yan Hua Chen ◽  
Zhong Yi Yu
Keyword(s):  
Heat Transfer ◽  
Energy Efficiency ◽  
Heat Exchanger ◽  
Heat Pump ◽  
Three Dimensional ◽  
Buried Pipe ◽  
Tube Heat Exchanger ◽  
Ground Source ◽  
Unit Energy ◽  
Heat Pump Unit

Through the three-dimensional heat transfer simulation of different periodic running of 3×3 tube group during one running period, the article draw the influence of vertical buried tube heat exchanger heat transfer performance under the different start-stop times, when total time is certain, shortening the continuous time of intermittent operation (increasing the start and stop times) helps promote the unit energy efficiency as the outlet water temperature change of the heat exchanger is toward to the favorable direction, and the trend of the change showed first increased and then decreased with the increase of start-stop times. Increasing the number of start and stop times do more contribution to promote the energy efficiency of the heat pump unit under the Working condition of refrigeration.

Investigation of Vortex Generator Enhanced Double-Fin and Tube Heat Exchanger

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Shobhana Singh ◽  
Kim Sørensen ◽  
Thomas Condra
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Fluid Flow ◽  
Heat Exchanger ◽  
Conjugate Heat Transfer ◽  
Waste Heat ◽  
Vortex Generator ◽  
Manufacturing Cost ◽  
Number Range ◽  
Tube Heat Exchanger

In the present work, a numerical analysis of conjugate heat transfer and fluid flow in vortex generator (VG) enhanced double-fin and tube heat exchanger is carried out. The enhanced design aims to improve the heat transfer performance of a conventional double-fin and tube heat exchanger for waste heat recovery applications. A three-dimensional (3D) numerical model is developed using ANSYS cfx to simulate fluid flow and conjugate heat transfer process. Numerical simulations with rectangular winglet vortex generators (RWVGs) at five different angles of attack (−20deg≤α≤20deg) are performed for the Reynolds number range of 5000≤Re≤11,000. Salient performance characteristics are analyzed in addition to the temperature distribution and flow fields. Based on the numerical results, it is concluded that the overall performance of the double-fin and tube heat exchanger can be improved by 27–91% by employing RWVGs at α=−20deg for the range of Reynolds number investigated. The study provides useful design information and necessary performance data that can be adopted for the design development of the heat exchanger at a lower manufacturing cost.

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