An Experimental Study on Evacuated Tube Solar Collector for Steam Generation in India
An evacuated tube solar collector is experimentally studied for steam generation. When the solar radiation falls on evacuated tubes, this energy is absorbed by the tubes and transferred to water with natural conduction and convection. A natural circulation of water occurs due to the inclination in tubes and header. In this experimental study, the efficiency of collector has been calculated. The result shows that the collector attains the maximum efficiency of 46.26% during 14:00 to 15:00h. Steam has been generated for two hours from 13:30 to 15:30 h on a winter day. Maximum solar intensity and maximum ambient temperatures are 795W/m2 and 19oC respectively on this day.
 R Perez et al. (1995), “Calculating solar radiation received by tubular solar-energy collectors”, Solar Engineering; I: 699-704.
 L Qin (1999), “Evaluation of evacuated tubular solar-collectors for large SDHW systems and combined space-heating systems”, Proceedings of northsun99, Edmonton, Alberta, Canada.
 S Lart (2000), “Development of a thermal performance test for an Integrated collector-storage solar water heating system”, PhD Thesis, pp 90-100, Division of mechanical engineering and energy studies, university of Wales Cardiff.
 L.J. Shah (2004), “Vertical evacuated tubular-collectors utilizing solar radiation from all directions”, Applied Energy 78, pp 371-395.
 G.L. Morrison (2004), “Water-in-glass evacuated tube solar water heaters”, Solar Energy 76, pp 135-140.
 G.L. Morrison (2005), “Measurement and simulation of flow rate in a water-in-glass evacuated tube solar water heater”, Solar Energy 78, pp 257-267.
 Yong Kim (2007), “Thermal performance comparisons of the glass evacuated tube solar collector with shapes of absorber tube”, Renewable Energy 32, pp 772-795.
 I. Budihardjo (2009), “Performance of Water-in-glass evacuated tube solar water heaters”, Solar Energy 83, pp 49-56.
 Liangdong Ma (2010), “Thermal performance analysis of the glass evacuated tube solar collector with U-tube”, Building and Environment 45, pp 1959-1967.
 Tang et al. (2011), “Comparative studies on thermal performance of water-in-glass Evacuated tube solar water heaters with different collector tilt-angles”, Solar Energy 85, pp 1381–1389.
 Zhang et al. (2014), “Thermal performance of direct-flow coaxial evacuated-tube solar collectors with and without a heat shield”, Energy Conversion and Management 84: pp 80–87.
 Kabeel et al. (2015), “Modified mathematical model for evaluating the performance of water-in-glass evacuated tube solar collector considering tube shading effect”, Energy 89: pp 24-34.
 Sabiha et al. (2015), “Progress and latest developments of evacuated tube solar collectors”, Renewable and Sustainable Energy Reviews 51: pp 1038–1054.