Performance of water-in-glass evacuated tube solar water heaters

Budihardjo, I.; Morrison, Graham

doi:10.1016/j.solener.2008.06.010

Cited by 218 publications

(71 citation statements)

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“…They are already widely used in domestic solar hot water systems, 36,37 and allow evacuated solar hot water tubes to be heated to over 100°C under stagnation conditions. 38 use thermal insulation on both top and bottom surfaces of the absorber to reduce convective loss to air as well as conductive and radiative heat losses to the water underneath. Finally, to overcome the mismatch between the latent heat of vaporization and the ambient solar flux, we use thermal concentration, by conducting the absorbed heat into the evaporation area, which is smaller than the absorber surface area.…”

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confidence: 99%

Steam generation under one sun enabled by a floating structure with thermal concentration

et al. 2016

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Abstract:Harvesting solar energy as heat has many applications, such as power generation, residential water heating, desalination, distillation and wastewater treatment. However, the solar flux is diffuse, and often requires optical concentration, a costly component, to generate high temperatures needed for some of these applications. Here we demonstrate a floating solar receiver capable of generating 100°C steam under ambient air conditions without optical concentration. The high temperatures are achieved by using thermal concentration and heat localization, which reduce the convective, conductive, and radiative heat losses. This demonstration of a low-cost and scalable solar vapor generator holds the promise of significantly expanding the application domain and reducing the cost of solar thermal systems. Keywords: solar thermal, steam generation, thermal concentration, water treatmentThe sun is a promising and abundant source of renewable energy that can potentially solve many of society's challenges. Solar thermal technologies, i.e., the conversion of the sunlight to thermal energy, are being developed for many applications such as power generation, domestic water heating, desalination, and other industrial processes. [1][2][3][4][5][6][7] Steam and vapor generation is often desired in these applications, but the dilute solar flux (1000 W/m 2 ) does not provide enough power per unit area of the absorber to reach the required high temperatures and to compensate for the large latent heat of water vaporization. Optical

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Steam generation under one sun enabled by a floating structure with thermal concentration

et al. 2016

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“…Of the literature reviewed, this approach is most It is expected that the efficiency of the vertical collector will be greater than that of the control during the winter months due to more direct incident solar radiation. This may be supported by the findings of Budihardjo and Morrison (2009), who although they did not test a vertical panel, found that as the inclination of the collector was increased to 45°, the annual savings during the winter months was 12% higher than when the collector was mounted at 22°. …”

Section: Collector 2 At 50º To Horizontal Intermediate Flow Rate (Comentioning

confidence: 77%

“…For example, one of the most common types of evacuated tube is hollow, and is referred to as a water-in glass type. Budihardjo and Morrison (2009) evaluate the performance of water-in-glass type evacuated tube solar water heaters. The performance of this system was compared to flat plate collectors and was found to be lower than a typical two-panel flat plate collector.…”

Section: Evacuated Tubesmentioning

confidence: 99%

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Measurement of the Efficiency of Evacuated Tube Solar Collectors Under Various Operating Conditions

Zubriski¹,

Dick

2012

Journal of Green Building

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“…Budihardjo et al 16 showed that heat loss coefficient varies with tube quality. For good quality tubes, the heat loss coefficient varies from 0.5 W/m 2 K (at T m 2 T a = 25°C) to 0.65 W/ m 2 K (at T m 2 T a = 65°C).…”

Section: F Rmentioning

confidence: 99%

Recent trends in solar thermal sorption cooling system technology

Bataineh

Al-rifai

2015

Advances in Mechanical Engineering

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Solar thermal cooling is the best alternative solution to overcome the problems associated with using nonrenewable resources. There are several thermal cooling methods developed differing from each other according to the thermodynamic cycle and type of refrigerant used. Recent developments in absorption and adsorption solar cooling systems are presented. Summarized thermodynamic modeling for both absorption and adsorption solar cooling systems is given. Brief thermal analysis among the types of solar collectors is presented. System efficiencies and optimization analysis are presented. The influences of geometrical, system configurations, and physical parameters on the performance of solar thermal sorption cooling system are investigated. The basis for the design of absorption and adsorption solar cooling systems is provided. Several case studies in different climatic conditions are presented. Economic feasibility for both systems is discussed. Comparison between the absorption and adsorption solar cooling system is summarized.

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Performance of water-in-glass evacuated tube solar water heaters

Cited by 218 publications

References 1 publication

Steam generation under one sun enabled by a floating structure with thermal concentration

Steam generation under one sun enabled by a floating structure with thermal concentration

Measurement of the Efficiency of Evacuated Tube Solar Collectors Under Various Operating Conditions

Recent trends in solar thermal sorption cooling system technology

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