Investigation of heat transfer in finned-tube condenser-evaporators

1985 ◽  
Vol 21 (12) ◽  
pp. 590-593
Author(s):  
V. E. Poznyak ◽  
V. N. Savel'ev
Keyword(s):  
Heat Transfer ◽  
Finned Tube ◽  
Tube Condenser

An Experiment and Simulation Study on Performance of Finned Tube Condenser

2014 ◽  
Vol 986-987 ◽  
pp. 814-818
Author(s):  
Hai Jie Qin ◽  
Wei Ying Zhu ◽  
Wei Zhong Li
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Performance Test ◽  
Finned Tube ◽  
Hot Water ◽  
Programming Tools ◽  
C Programming ◽  
Test Platform ◽  
Experiment And Simulation ◽  
Tube Condenser

In this paper, a finned tube condenser performance test platform by using hot water as heat transfer medium in the pipe was established. The air side correlations of pressure drop and heat transfer were acquired based on lots of testing datas.A segment by segment model of the finned tube condenser used in these correlations was proposed and a simulation program was developed by using Visual C++ programming tools. Experiment and simulation results show that the air side correlations of pressure drop and heat transfer are fitting well with experimental datas. The deviation between the experimental and calculated values is within ±5%.The deviation of Nu Number is within ±10% and the deviation of the pressure loss is within±15%.

A discussion about the methodology for validating a model of a finned-tube condenser considering different correlations for the heat transfer coefficients and pressure drop

2015 ◽  
Vol 21 (5) ◽  
pp. 585-594
Author(s):  
Alessandro Pisano ◽  
Santiago Martinez-Ballester ◽  
José Miguel Corberán ◽  
Fernando Hidalgo Monpeán ◽  
Fernando Illán Gómez ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Finned Tube ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Tube Condenser

Design Study Comparison of Plain Finned Versus Louvered Finned-Tube Condenser Heat Exchangers

2003 ◽  
Author(s):  
Susan W. Stewart ◽  
Sam V. Shelton
Keyword(s):  
Heat Transfer ◽  
Optimum Design ◽  
System Performance ◽  
Air Conditioning ◽  
Finned Tube ◽  
Design Parameters ◽  
Air Conditioning System ◽  
Frictional Pressure Drop ◽  
Residential Air Conditioning ◽  
Tube Condenser

Enhanced fins are widely used in residential air conditioning system finned-tube condenser designs. While this heat transfer augmentation technique increases the heat transfer coefficient in the heat exchanger, it also increases the air side frictional pressure drop. These two effects compete with each other, making it difficult to determine the relative goodness between plain fin versus enhanced fin designs with realistic constraints. In the past, this design tradeoff has been largely determined by experimental trial and error or heuristic figures of merit. No studies are available showing the effect of fin augmentation on overall system performance under consistent cost and frontal area constraints. The residential air conditioning system model calculates all component and system performance parameters. The condenser design requires the specification of approximately ten design parameters. A search method is used to vary these ten parameters and reach an optimum design based on a COP (efficiency) figure-of-merit with condenser cost and other appropriate constraints. It was found that when optimized, louvered fin designs always show better system performance than the optimum plain fin design for the cases studied. However a decrease in system efficiency can result if louvers are merely added to a plain fin optimum design.

Convective heat transfer of a single annually finned-tube condenser

2014 ◽  
Vol 24 (8) ◽  
pp. 1696-1714
Author(s):  
Z.X. Yuan ◽  
L. Chen
Keyword(s):  
Heat Transfer ◽  
Friction Factor ◽  
Flow Resistance ◽  
Unit Length ◽  
Finned Tube ◽  
Influential Factor ◽  
Content Type ◽  
Fin Thickness ◽  
Fin Spacing ◽  
Tube Condenser

Purpose – The purpose of this paper is to study the thermal and flow characteristics of a single annually finned-tube condenser. The velocity and the temperature field inside the fin channel are revealed. Changes of the heat transfer and the flow resistance for typical fin configurations are analyzed. The optimal combinations of the fin dimension in terms of the enhancement of heat transfer are suggested. Design/methodology/approach – The problem has been numerically investigated with the FLUENT software. K-ɛ model is applied in the solution of the turbulent cases. The local and the average feature of the thermal performance and the friction factor are determined. Furthermore, the effect of the fin spacing, the fin height, and the fin thickness on the heat transfer and the flow resistance are verified. Findings – The numerical results reveal that the fin spacing is the most influential factor of all fin dimensions not only to the heat transfer but also to the flow resistance. Both the heat transfer and the flow resistance are compared with those related data available in the public literature. On the other hand, the fin height and the fin thickness affect the heat transfer of the condenser in a much less significant way in comparison to that of the fin spacing. Originality/value – This paper provides some meaningful information of the fin-dimensional effect on the heat transfer and the flow resistance for a single finned tube condenser. For such kind of heat exchanger, the heat transfer coefficient, the friction factor, and the heat transfer amount per unit length tube are all important to describe the performance feature.

Oval Finned Tube Condenser and Design Pressure Limits

2001 ◽  
Vol 8 (3) ◽  
pp. 147-158 ◽  
Author(s):  
Ralph L. Webb ◽  
Ajay Iyengar
Keyword(s):  
Finned Tube ◽  
Tube Condenser ◽  
Design Pressure

HEAT TRANSFER WITH PHASE CHANGE AROUND FINNED TUBE SUBMERSED IN PCM

2018 ◽  
Author(s):  
Felipe Silva dos Santos ◽  
Kamal Ismail ◽  
Fátima Lino
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Finned Tube

Experimental Investigation of Heat Transfer Enhancement by Using Different Number of Fins in Circular Tube

2018 ◽  
Vol 6 (3) ◽  
pp. 1-12
Author(s):  
Kamil Abdul Hussien
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Cold Water ◽  
Finned Tube ◽  
Hot Water ◽  
Copper Tube ◽  
Smooth Tube ◽  
Tube Heat Exchanger ◽  
Mass Flow Rates ◽  
Flow Heat

Abstract-The present work investigates the enhancement of heat transfer by using different number of circular fins (8, 10, 12, 16, and 20) in double tube counter flow heat exchanger experimentally. The fins are made of copper with dimensions 66 mm OD, 22 mm ID and 1 mm thickness. Each fin has three of 14 mm diameter perforations located at 120o from each to another. The fins are fixed on a straight smooth copper tube of 1 m length, 19.9 mm ID and 22.2 mm OD. The tube is inserted inside the insulated PVC tube of 100 mm ID. The cold water is pumped around the finned copper tube, inside the PVC, at mass flow rates range (0.01019 - 0.0219) kg/s. The Reynold's number of hot water ranges (640 - 1921). The experiment results are obtained using six double tube heat exchanger (1 smooth tube and the other 5 are finned one). The results, illustrated that the heat transfer coefficient proportionally with the number of fin. The results also showed that the enhancement ratio of heat transfer for finned tube is higher than for smooth tube with (9.2, 10.2, 11.1, 12.1 13.1) times for number of fins (8, 10, 12, 16 and 20) respectively.

Effect of Insulated/Uninsulated Channel Walls on Heat Transfer From a Horizontal Finned Tube in a Vertical Channel

1987 ◽  
Vol 109 (2) ◽  
pp. 388-391 ◽  
Author(s):  
E. M. Sparrow ◽  
M. A. Ansari
Keyword(s):  
Heat Transfer ◽  
Radiation Heat Transfer ◽  
Vertical Channel ◽  
Finned Tube ◽  
Radiation Heat ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Metallic Sheet ◽  
Rayleigh Numbers ◽  
Metal Wall

Measurements were made of the combined natural convection and radiation heat transfer from a horizontal finned tube situated in a vertical channel open at the top and bottom. In one set of experiments, both walls of the channel were heavily insulated, while in a second set of experiments, one of the insulated walls was replaced by an uninsulated metallic sheet. In general, the heat transfer coefficients were found to be lower with the metal wall in place, but only moderately. With the finned tube situated at the bottom of the channel, the differences in the heat transfer coefficients corresponding to the two types of walls were only a few percent. When the tube was positioned at the mid-height of the channel, larger differences were encountered, but in the practical range of Rayleigh numbers, the differences did not exceed 5 percent.

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