Solar Water Heater: Black Versus Transparent Hosepipe Heat Absorbers
Journal Title: IOSR Journal of Applied Physics (IOSR-JAP) - Year 2018, Vol 10, Issue 6
Abstract
We have compared the performances and efficiencies of solar water heatersconstructed using coiled black and coiled transparent hosepipes.The two hosepipes were equivalent in length and diameter measuring about 50 yards (45.7m) and 1 inch (2.5cm) in diameter. Theyconstituted the heat absorbers of the solar collector system in which water was pumped and cycled continuously in the hosepipe by a dc water pump powered by photovoltaic (PV)panels. The 50 yard long hosepipe (black or transparent) wasformedinto a circular flat coil of about 20 turns inside a shallow rectangular box and covered with a transparent glass/plastic sheet.The waterpump draws water from the bottom of a reservoir, runs it through the coiled hose and discharges it back into the reservoir from the top.In this process the sun heats up the hose through solar radiation and the pipe heats up the water through conduction. We investigated whether a black hose is more efficient in heating the water than a transparent hose and found no significant difference.The explanation lies in the factthat when the hose is contained in the glass covered box, the water heating process is dominated more by greenhouse radiation than by direct radiation. Hence it is immaterial whether the hose is black or not.Thisinvestigation was carried out in the month of January and February and the location was Owerri, South East Nigeria.
Authors and Affiliations
E. C. Mbamala*, C. E. Akujor
Keywords
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- EP ID EP423855
- DOI 10.9790/4861-1006012834
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