Performance of Water Heating and Cooling System Using Waved Zinc Sheet

The performance of water heating and cooling unit system using waved zinc sheet was tested in two modes of direct and indirect. The 40 liters of water was heated or cooled by 18 copper tubes with 10 mm in diameter and 1.52 m in length which attached to the waved zinc sheet in the dimension of 0.64 m x 1.52 m. The 9 copper tubes on the top and the 9 copper tubes at the bottom of zinc sheet are called direct and indirect modes. At day time, water was heated up and re-circulated in the upper tank by thermosyphonic phenomena. At night time, water was cooled down from the upper tank to the lower tank by gravitation force and was then circulated to the upper tank again by a 0.5 hp of pump. The experimental results revealed that the average temperature of water was raised from 33-37 to 54°C in both modes when the global solar radiation was nearly intense. For the cooling system at the similar ambient temperature, the average water temperature of direct and indirect modes was fallen down from a range of 32-34°C to 24-25°C. In addition to test the direct mode performance at different ambient air temperatures in early morning, it found that the water temperature was increased with ambient temperature. However, the concomitance of different water and ambient temperatures in the morning would be approached to the constant value in late afternoon. In case of cooling system, water temperature was slowly cooled down in early night and was equivalent to ambient temperature in the morning next day.