Experimental study of the effect of air inlet angle on the air-side performance for cross-flow finned oval-tube heat exchangers

2014 ◽  
Vol 52 ◽  
pp. 146-155 ◽  
Author(s):  
X.P. Du ◽  
M. Zeng ◽  
Z.Y. Dong ◽  
Q.W. Wang
Keyword(s):  
Experimental Study ◽  
Heat Exchangers ◽  
Cross Flow ◽  
Air Inlet ◽  
Inlet Angle ◽  
Oval Tube

Experimental study on heat transfer and pressure drop of twisted oval tube bundle in cross flow

2018 ◽  
Vol 99 ◽  
pp. 251-258 ◽  
Author(s):  
Xiuzhen Li ◽  
Dongsheng Zhu ◽  
Yingde Yin ◽  
Shijie Liu ◽  
Xun Mo
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Pressure Drop ◽  
Tube Bundle ◽  
Cross Flow ◽  
Oval Tube

Numerical Prediction of Enhanced Heat Transfer Using Oval Tubes and Delta Winglets

2002 ◽  
Author(s):  
D. Maurya ◽  
S. Tiwari ◽  
G. Biswas ◽  
V. Eswaran ◽  
A. K. Saha
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Power Plants ◽  
Transport Coefficients ◽  
Three Dimensional ◽  
Cross Flow ◽  
Vortex Generators ◽  
Delta Winglet ◽  
Fin Tube ◽  
Oval Tube

Unsteady three-dimensional laminar flow and heat transfer in a channel with a built-in oval tube and delta winglets have been obtained through the solution of the complete Navier-Stokes and energy equations using a body-fitted grid and a finite-volume method. The geometrical configuration represents an element of a gas-liquid fin-tube cross flow heat exchanger. The air-cooled condensers of the geothermal power plants also use fin-tube heat exchangers. The size of such heat exchangers can be reduced through enhancement in transport coefficients on the air (gas) side, which are usually small compared to the liquid side. In a suggested strategy, oval tubes are used in place of circular tubes, and delta winglet type vortex generators in common-flow-down configuration are mounted on the fin-surface in front of the tubes, while another delta winglet pair in common-flow-up configuration is mounted downstream of the first set of winglets. An evaluation of this augmentation strategy is attempted in this investigation. The investigation was carried out for a winglet angle of attack of 40 degrees to the incoming flow. The structures of the velocity field, and the heat transfer characteristics have been presented. The results indicate that vortex generators in conjunction with the oval tube show definite promise for the improvement of fin-tube heat exchangers.

Experimental study on corrugated cross-flow air-cooled plate heat exchangers

2010 ◽  
Vol 34 (8) ◽  
pp. 1265-1272 ◽  
Author(s):  
Minsung Kim ◽  
Young-Jin Baik ◽  
Seong-Ryong Park ◽  
Ho-Sang Ra ◽  
Hyug Lim
Keyword(s):  
Experimental Study ◽  
Heat Exchangers ◽  
Cross Flow ◽  
Plate Heat

scholarly journals An experimental investigation on air-side performances of finned tube heat exchangers for indirect air-cooling tower

2014 ◽  
Vol 18 (3) ◽  
pp. 863-874 ◽  
Author(s):  
Xueping Du ◽  
Yantao Yin ◽  
Min Zeng ◽  
Pengqing Yu ◽  
Qiuwang Wang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Cooling Tower ◽  
Finned Tube ◽  
Air Cooling ◽  
Flat Tube ◽  
Tube Heat Exchanger ◽  
Air Inlet ◽  
Oval Tube

A tremendous quantity of water can be saved if the air cooling system is used, comparing with the ordinary water-cooling technology. In this study, two kinds of finned tube heat exchangers in an indirect air-cooling tower are experimentally studied, which are a plain finned oval-tube heat exchanger and a wavy-finned flat-tube heat exchanger in a cross flow of air. Four different air inlet angles (90?, 60 ?, 45?, and 30?) are tested separately to obtain the heat transfer and resistance performance. Then the air-side experimental correlations of the Nusselt number and friction factor are acquired. The comprehensive heat transfer performances for two finned tube heat exchangers under four air inlet angles are compared. For the plain finned oval-tube heat exchanger, the vertical angle (90?) has the worst performance while 45? and 30? has the best performance at small ReDc and at large ReDc, respectively. For the wavy-finned flat-tube heat exchanger, the worst performance occurred at 60?, while the best performance occurred at 45? and 90? at small ReDc and at large ReDc, respectively. From the comparative results, it can be found that the air inlet angle has completely different effects on the comprehensive heat transfer performance for the heat exchangers with different structures.

scholarly journals Experimental and numerical analyses of finned cross flow heat exchangers efficiency under non-uniform gas inlet flow conditions

2010 ◽  
Vol 31 (4) ◽  
pp. 133-144 ◽  
Author(s):  
Tomasz Bury ◽  
Jan Składzień ◽  
Katarzyna Widziewicz
Keyword(s):  
Heat Exchangers ◽  
Cross Flow ◽  
Finned Tube ◽  
Numerical Analyses ◽  
Numerical Code ◽  
Flow Conditions ◽  
Inlet Flow ◽  
Air Inlet ◽  
Flow Heat ◽  
Liquid Type

Experimental and numerical analyses of finned cross flow heat exchangers efficiency under non-uniform gas inlet flow conditionsThe work deals with experimental and numerical thermodynamic analyses of cross-flow finned tube heat exchangers of the gas-liquid type. The aim of the work is to determine an impact of the gas non-uniform inlet on the heat exchangers performance. The measurements have been carried out on a special testing rig and own numerical code has been used for numerical simulations. Analysis of the experimental and numerical results has shown that the range of the non-uniform air inlet to the considered heat exchangers may be significant and it can significantly affect the heat exchanger efficiency.

Dynamic Modeling of Heat Exchangers With Humidity and Condensation

2015 ◽  
Author(s):  
Herschel Pangborn ◽  
Andrew G. Alleyne
Keyword(s):  
Heat Exchangers ◽  
Cross Flow ◽  
Control Design ◽  
Vapor Compression ◽  
Air Humidity ◽  
Modeling And Control ◽  
Air Inlet ◽  
Condensate Formation ◽  
Simulation Results ◽  
And Control

The effects of air humidity on the performance of refrigerant-to-air heat exchangers in vapor compression systems (VCSs) are non-negligible in modeling and control design for some applications. Such applications include both those in which the ambient humidity is expected to vary greatly over time and those in which control of the air outlet humidity is desired. This paper presents a control-oriented dynamic model for cross-flow refrigerant-to-air heat exchangers that uses knowledge of the air inlet humidity to improve the accuracy of refrigerant-side and air-side outputs, as well as to calculate the air outlet humidity and rate of condensate formation. Simulation results are validated with experimental data collected from a 1kW VCS test stand.

AN EXPERIMENTAL STUDY OF PLASTIC HEAT EXCHANGERS APPLICABLE FOR DEHUMIDIFICATION

2018 ◽  
Author(s):  
Mohammed Amer ◽  
Miao-Ru Chen ◽  
Ming-Chang Lu ◽  
Chi-Chuan Wang
Keyword(s):  
Experimental Study ◽  
Heat Exchangers
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