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.
References
[1]
Kannan, N. and Vakeesan, D. (2016) Solar Energy for Future World: - A review. Renewable and Sustainable Energy Reviews, 62, 1092-1105. https://doi.org/10.1016/j.rser.2016.05.022
[2]
REN21 (2019) Renewables 2019 Global Status Report. REN21 Secretariat, Paris.
[3]
Kalogirou, S.A. (2004) Environmental Benefits of Domestic Solar Energy Systems. Energy Conversion and Management, 45, 3075-3092. https://doi.org/10.1016/j.enconman.2003.12.019
[4]
Budihardjo, I., Morrison, G.L. and Behnia, M. (2007) Natural Circulation Flow through Water-in-Glass Evacuated Tube Solar Collectors. Solar Energy, 81, 1460-1472. https://doi.org/10.1016/j.solener.2007.03.002
[5]
Hayek, M., Assaf, J. and Lteif, W. (2011) Experimental Investigation of the Performance of Evacuated-Tube Solar Collectors under Eastern Mediterranean Climatic Conditions. Energy Procedia, 6, 618-626. https://doi.org/10.1016/j.egypro.2011.05.071
[6]
Morrison, G.L., Budihardjo, I. and Behnia, M. (2005) Measurement and Simulation of Flow Rate in a Water-in-Glass Evacuated Tube Solar Water Heater. Solar Energy, 78, 257-267. https://doi.org/10.1016/j.solener.2004.09.005
[7]
Budihardjo, I., Morrison, G.L. and Behnia, M. (2003) Development of TRNSYS Models for Predicting the Performance of Water-in-Glass Evacuated Tube Solar Water Heaters in Australia. School of Mechanical & Manufacturing Engineering, 1-10.
[8]
Budihardjo, I. and Morrison, G.L. (2009) Performance of Water-in-Glass Evacuated Tube Solar Water Heaters. Solar Energy, 83, 49-56. https://doi.org/10.1016/j.solener.2008.06.010
[9]
Zhang, X., You, S., Xu, W., Wang, M., He, T. and Zheng, X. (2014) Experimental Investigation of the Higher Coefficient of Thermal Performance for Water-in-Glass Evacuated Tube Solar Water Heaters in China. Energy Conversion and Management, 78, 386-392. https://doi.org/10.1016/j.enconman.2013.10.070
[10]
Tang, R., Gao, W., Yu, Y. and Chen, H. (2009) Optimal Tilt-Angles of All-Glass Evacuated Tube Solar Collectors. Energy, 34, 1387-1395. https://doi.org/10.1016/j.energy.2009.06.014
[11]
Morrison, G.L., Budihardjo, I. and Behnia, M. (2004) Water-in-Glass Evacuated Tube Solar Water Heaters. Solar Energy, 76, 135-140. https://doi.org/10.1016/j.solener.2003.07.024
[12]
Tang, R., Yang, Y. and Gao, W. (2011) Comparative Studies on Thermal Performance of Water-in-Glass Evacuated Tube Solar Water Heaters with Different Collector Tilt-Angles. Solar Energy, 85, 1381-1389. https://doi.org/10.1016/j.solener.2011.03.019
[13]
Bracamonte, J., Parada, J., Dimas, J. and Baritto, M. (2015) Effect of the Collector Tilt Angle on Thermal Efficiency and Stratification of Passive Water in Glass Evacuated Tube Solar Water Heater. Applied Energy, 155, 648-659. https://doi.org/10.1016/j.apenergy.2015.06.008
