Abstract
The aim of this study to improve the performance of heat exchanger by using the medium integral fins on the cross flow heat exchanger practically, so, two the heat exchangers from copper were manufactures with eight passes for comparison under different boundary conditions. The water flow rate flow inner the tubes with (2, 3, 4, 5, 6) L/min with inlet temperatures (50, 60, 70) oC, as for the air flow rate were passed outer the tubes by speeds (1, 1.7, 2.3) m/sec. The results show that the medium integral finned tube gives more improvement the heat transfer than the smooth tube about 203.97% and 205.1% was enhancement factor. Motivation: The aim is improvement the heat transfer coefficient for cross flow heat exchanger by using medium integral finned tube. Study the effect of various water stream rate, air speed and inlet water temperature on heat transfer coefficient for them, Finding the cases which enhanced heat transfer for various ranges of air and water as well as inlet temperatures and the speed at the entrance. Develop the empirical correlations for (Nua) of smooth and medium integral finned tubes as function of (Pra) and (Rea).
Highlights
A heat exchanger is a device used to exchange heat between two liquids, without mixing them
Main reason why integral finned tubes are enhanced over smooth tubes is because of the added surface area presented by the fins that increases the area for heat transfer [1]
When taking experimental readings from the laboratory apparatus, there is an error rate that comes from the accuracy of the work of the measuring instruments and to achieve the accuracy required for the measured parameters, the experimental measured repeated times three or more in order to find the uncertainty error by using the method of Klein,[15].Calculation error were overall heat transfer coefficient (2.27 to -2.38)%, heat transfer (11.65-15.19)%, air side Reynolds number (0.174-0.17)%, air side heat transfer coefficient (2.95-3.14)% and (Nua) ( 3.027 to-3.223)%
Summary
A heat exchanger is a device used to exchange heat between two liquids, without mixing them. The hot water flows inside it (2, 3, 4, 5, 6) L / min with inlet temperatures of (50, 60, 70) The effect of these variables on heat transfer and optimization were the high integral finned tube the best in heat transfer about (329.9%) and the improvement factor (291%). The impacts of the dimensions of the fins (width , height , pitch) and air speeds (6, 8, 10, 12 and 15) m/s on fin efficiency as well as the convective heat transfer coefficient. The test show that the air side heat transfer coefficient of the smooth tube was lower than that of the low finned tube and the improvement proportion or (Nuaf /Nuas) was (1.86 to 2.38) for eight passes. Enhance of the outside heat transfer coefficient by increasing the air speed
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