| Popis: |
In this study, a practical study was conducted to compare the efficient behavior of close loop solar water heater with thermosiphon- riser tubes with dimensions (80 cm width, 120 cm height) with two acrylic covering. both with and without thermal performance enhancer, and to find the optimum mode of convection in the collector. the thermal performance enhancers have been used, helical spring with a core bar, and they were inserted a solar absorber tube The ethanol as a working fluid is used by applying a practical test set to it. The current tests were conducted on September 6, 8 and October 4, 5 , 2022, in Baghdad, Iraq, under identical ambient and load circumstances. All examination were from 08:00 am to 16:00 pm, at tilted angle (45 °) South in sunny days. The experimental tests were carried out at flow rates (1 and 1.5 L/min) and filling ratio (50%). At a flow rate of 1.5 L/min and a filling ratio of 50%, using an inserted helical spring with a core bar yielded the highest daily efficiency of 70%. In the interest of the system. |
