scholarly journals Research on fins for air conditioning heat exchangers. (1st report. Numerical analysis of heat transfer on louvered fins).

1989 ◽  
Vol 55 (519) ◽  
pp. 3449-3456
Author(s):  
Michio HIRAMATSU ◽  
Tsuneo ISHIMARU ◽  
Koushou MARSUZAKI
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Heat Exchangers ◽  
Air Conditioning ◽  
Louvered Fins

scholarly journals COMPUTER PROGRAM FOR CALCULATION MICROCHANNEL HEAT EXCHANGERS FOR AIR CONDITIONING SYSTEMS

2016 ◽  
Vol 52 (3) ◽  
Author(s):  
Olga V. Olshevska
Keyword(s):  
Heat Transfer ◽  
Computer Program ◽  
Heat Exchangers ◽  
Software Package ◽  
Air Conditioning ◽  
Correlation Equation ◽  
Design Time ◽  
Software Packages ◽  
Air Conditioning Systems ◽  
Thermodynamic Equations

Creating a computer program to calculate microchannel air condensers to reduce design time and carrying out variant calculations. Software packages for thermophysical properties of the working substance and the coolant, the correlation equation for calculating heat transfer, aerodynamics and hydrodynamics, the thermodynamic equations for the irreversible losses and their minimization in the heat exchanger were used in the process of creating. Borland Delphi 7 is used for creating software package.

scholarly journals The Effect of Geometrical Parameters on Heat Transfer Characteristics of Compact Heat Exchanger with Louvered Fins

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
P. Gunnasegaran ◽  
N. H. Shuaib ◽  
M. F. Abdul Jalal
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Three Dimensional ◽  
Cross Flow ◽  
Geometrical Parameters ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Flow And Heat Transfer ◽  
Drop Flow ◽  
Louvered Fins

Compact heat exchangers (CHEs) have been widely used in various applications in thermal fluid systems including automotive thermal management systems. Among the different types of heat exchangers for engine cooling applications, cross-flow CHEs with louvered fins are of special interest because of their higher heat rejection capability with the lower flow resistance. In this study, the effects of geometrical parameters such as louver angle and fin pitch on air flow and heat transfer characteristics on CHEs are numerically investigated. Numerical investigations using five different cases with increased and decreased louver angles (+2°, +4°, −2°, −4°, and uniform angle 20°), with a fixed fin pitch and using three different fin pitches (1.0 mm, 2.0 mm, and 4.0 mm), and with the fixed louver angle are examined. The three-dimensional (3D) governing equations for the fluid flow and heat transfer are solved using a standard finite-volume method (FVM) for the range of Reynolds number between 100 and 1000. The computational model is used to study the variations of pressure drop, flow temperature, and Nusselt number.

Heat-Transfer and Flow-Friction Characteristics of Crossed-Rod Matrices

1960 ◽  
Vol 82 (3) ◽  
pp. 199-213 ◽  
Author(s):  
A. L. London ◽  
J. W. Mitchell ◽  
W. A. Sutherland
Keyword(s):  
Heat Transfer ◽  
Electrical Resistance ◽  
Heat Exchangers ◽  
Air Conditioning ◽  
Nuclear Reactor ◽  
Heat Transfer Surface ◽  
Friction Behavior ◽  
Flow Friction ◽  
Nuclear Reactor Fuel ◽  
Fuel Elements

The paper presents a continuation of the program on porous media heat-transfer and flow-friction behavior previously covered in References [2b] and [3b]. All the previous results of interest to the designer on woven-screen matrices and crossed-rod matrices of a random configuration are summarized here. In addition, new design results for the regular in-line and regular staggered crossed-rod-matrix configurations are reported. Matrices of the type considered here may find application as heat-transfer surface geometries for nuclear-reactor fuel elements, for electrical resistance heaters and for periodic-flow-type heat exchangers used for gas-turbine regenerators, and some air-conditioning applications.

scholarly journals Optimization of heat transfer at the surface of parabolic fins by genetic Algorithm

2017 ◽  
Vol 52 (4) ◽  
pp. 325-330
Author(s):  
A Gholami ◽  
H Mehrjou
Keyword(s):  
Heat Transfer ◽  
Genetic Algorithm ◽  
Nusselt Number ◽  
Hydraulic Resistance ◽  
Economic Efficiency ◽  
Heat Exchangers ◽  
Air Conditioning ◽  
Energy Exchanges ◽  
Extended Surfaces ◽  
Library Method

Thermal fins are extended surfaces like longitudinal, radial, and cylindrical fins. They are used for the improvement of heat transfer between an object and fluid. Fins can be applied in many processes of objects cooling such as electrical appliances, many types of engines, transformers, chemical industry, air conditioning, heat exchangers and the industries of energy exchanges. This matter is one of the main results of paying attention to this issue. Therefore, this study examined the optimization of fin heat transfer by using a genetic algorithm and consideration of Nusselt number and hydraulic resistance as the objective function. In this paper, we investigated the optimization of the fin to maximize the heat transfer and also to minimize the hydraulic resistance. The results of this study can be effective in term of technical and economic efficiency in the industry of fin transformer. The stimulation and library method has been used to collect data. The results indicated that if the hydraulic resistance was limited to a specific value, using wavy fins will not improve the device heat.Bangladesh J. Sci. Ind. Res. 52(4), 325-330, 2017

Mesochannel Compact Heat Exchangers for Automotive Air Conditioning Applications

2008 ◽  
Author(s):  
Amir Jokar ◽  
Mohammad H. Hosni ◽  
Steven J. Eckels
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Heat Exchangers ◽  
Air Conditioning ◽  
Working Fluid ◽  
Empirical Correlations ◽  
Transfer Coefficients ◽  
Compact Heat Exchangers ◽  
Automotive Air Conditioning ◽  
Uncertainty Estimates

Experimental study of the single-phase heat transfer and fluid flow in mesochannels, i.e., between microchannels and minichannels, has received continued interest by researchers in recent years. The studies have resulted in empirical correlations for various geometries ranging from simple circular pipes to complicated enhanced non-circular channels. In spite of these extensive studies, it is still unclear whether the theories and correlations developed for conventional macrochannels are directly applicable for use in microchannels (Dh = 10–200 μm) and minichannels (Dh = 200 μm–3 mm) with heat exchanger applications. A few researchers have agreed that similar results maybe obtained for the laminar flow regime regardless of the channel size; however, no general agreement has been reached for the transitional and turbulent flow regimes yet. In this study, different mesochannel air-liquid compact heat exchangers were evaluated and the experimental results were compared with published empirical correlations. These compact heat exchangers were used in the secondary fluid loops of an automotive air conditioning system that used refrigerant R134a as the working fluid. A modified Wilson plot technique was applied to obtain the heat transfer coefficients, and the Fanning equation was used to calculate the pressure drop friction factors. The uncertainty estimates for the measured and calculated parameters were calculated. The results of this study showed that the well established heat transfer and pressure drop correlations for the macrochannels are not directly applicable for use in the compact heat exchangers with mesochannels.

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