Study on the impact of twisted tapes on the water temperature enhancement in solar water heater

Abstract

This form of solar collector, known as an evacuated tube collector, is primarily utilized for water heating applications on both a domestic and commercial scale. When compared to other types of solar collectors, they discovered that theirs was greater in thermal efficiency. The evacuated tube is the most basic type of solar collector, and it has found its most widespread application as pump-less circulation solar water heating system for domestic and commercial applications, among other things. But they are plagued by an inherent problem that is caused by the inactive zone that has evolved at the base of each tube's interior walls. Twisted tubes constructed of aluminium are used in this study to overcome this issue, which is discussed in more detail below. The experimental findings demonstrated that the presence of twisting tape inserts expedited the transferring of heat inside the dormant zone; further, it assisted in maintaining a consistent temperature throughout the tube during the testing period. As a result of the use of twisting tape inserts, the water temperature at the dormant zone was raised to 71 °C, which was 29 °C higher than the temperature at the active region when the tapes were not utilized. The twisted tapes also increased the mean tube water temperature through the highest value of 11 °C.