الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 152 |  |  |
| | | from | 152 | | |
Abstract
The current study examined the thermal and flow behavior of finned coiled tube heat exchangers for chilled water air conditioning systems. The variables under study include the effects of a number of factors on the thermal-hydraulic characteristics of a finned cooling coiled tube heat exchanger, including the shape of the fin dimples, the number of fins, and the Reynolds numbers of the water and air sides. The objective is to improve the finned cooling coiled tube heat exchanger using dimples compared to the equivalent coiled tube heat exchanger without dimples. Six test specimens were made, three of which had fin dimple geometries of a triangle with sharp sides, a triangle with curved sides, and a teardrop. The three additional specimens with fin numbers 140, 155, and 170. The test runs were conducted with air Reynolds numbers ranging from 1540 to 6205 in a transparent air duct, while Reynolds numbers ranging from 3350 to 16250 were used for the chilled water flow side of the experiment. The results showed that a heat exchanger (D) with a curved-sided triangular fin dimple shape achieves a better Nusselt number and flow area goodness factor. A cooling coil with a fin count of 170 has a greater energy efficiency ratio than cooling coils with fin counts of 140 and 155 by roughly 24.68% and 12.94%, respectively. The experimental data with deviations are used to obtain correlations for the Nusselt number, energy efficiency ratio, effectiveness, flow area goodness factor, and friction factor.