Abstract
Solar water heaters which provide a cost-effective and environmental friendly approach to hot water generation are in widespread application. Evacuated tube solar water heaters perform better than flat plate solar water heaters as a result of their greater surface area exposed for sunlight absorption. Water-in-glass evacuated tube solar water heaters are widely used as compared to heat-pipe solar water heaters due to their short payback periods. In this study, the performance of water-in-glass evacuated tube solar water heater is investigated through experiments under the climatic conditions in Kenya. The results revealed a daily efficiency range of 0.58 - 0.65 and a daily final outlet temperature greater than 55°C given an initial temperature of 25°C.
Highlights
Increases in population and technological advancement have contributed to a major rise in energy demand [1]
Evacuated tube solar water heaters perform better than flat plate solar water heaters as a result of their greater surface area exposed for sunlight absorption
The performance of water-in-glass evacuated tube solar water heater is investigated through experiments under the climatic conditions in Kenya
Summary
Increases in population and technological advancement have contributed to a major rise in energy demand [1]. A study conducted by Budihardjo and Morrison [8] under the climatic condition in Sydney compared the performance of flat plate solar water heater with water in glass evacuated tube solar water heater. The overall performance of water in glass solar water heater under the local weather conditions in Kenya is investigated as well as the rate of heat loss from the system during the night. This will give insight into the design of improved products of water in glass evacuated tube solar water heater for the extraction of maximum heat energy from the sun
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