Nocturnal reverse flow in water-in-glass evacuated tube solar water heaters

Tang, Runsheng; Yang, Yuqin

doi:10.1016/j.enconman.2014.01.025

Cited by 44 publications

(10 citation statements)

References 10 publications

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“…Bracamonte et al showed effect of the tilt angle (10°, 27° and 45°) on thermal efficiency and stratification of water in glass evacuated tube passive solar water heater [28]. Manouchehri et al presented impact of small tilt angles of 0°, 2°, 5°, 10° and 15° with respect to the vertical on the performance of falling film drain water heat recovery systems [29]. Tang investigated the thermal performance of the water in glass evacuated tube in the solar water heaters (SWH) at nights where the larger the tilt-angle of the collector lead to increase the reverse flow rate [30].…”

Section: Summary Of Criteriamentioning

confidence: 99%

Optimal Position of Solar Collectors: A Review

Skerlić¹,

Nikolić²,

Cvetković³

et al. 2018

Applied Engineering Letters

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Section: Summary Of Criteriamentioning

confidence: 99%

Optimal Position of Solar Collectors: A Review

Skerlić¹,

Nikolić²,

Cvetković³

et al. 2018

Applied Engineering Letters

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“…They found that for a service period of 15 years, SWH for the size of up to a family of four to six persons is more economical than that of a GWH (LNG or LPG) and an EWH. Tang and Yang [22] worked on the thermal performance analysis of the ETC-based SWH at nights for the typical climatic condition of China. Reverse flow in the SWH was found to be much higher than that of thermosyphonic domestic solar water heater with flat-plate collectors.…”

Section: Introductionmentioning

confidence: 99%

Thermal and economic analysis of low-cost modified flat-plate solar water heater with parallel two-side serpentine flow

Hossain

Pandey

Tunio

et al. 2015

J Therm Anal Calorim

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The present study deals with the thermal performance evaluation and economic analysis of a low-cost modified flat-plate solar water heater (SWH) with a parallel two-side serpentine flow. This is a unique inexpensive and easily fabricated SWH having better thermal efficiency than those investigated by earlier authors. The solar water heating system is having parallel two-side serpentine arrangement with 68 pieces of copper elbows inclined at an angle of 908 for the water flow inside the collector. A PV panel of the suitable wattage has been applied to supply power to the controller circuit and pump which makes this system selfsufficient. This experimental setup is developed at the roof of the building keeping the fact in the mind to be used for both residential and commercial buildings as per the needs. The peak thermal efficiency of the system is 81.26 and 80.20 % individually for the months of June and July under typical climatic condition of Malaysia, while the average thermal efficiencies for the months of June and July have been found to be 70.24 and 70.96 % relatively, which is compared with those of other eight designs presented to the study. Furthermore, a comprehensive fiscal analysis for the long run using MATLAB has been presented to the study. It is found that this solar water heater is more economical than that of an electric water heater in the long run.

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“…The use of renewable energy resources, such as solar, wind, biomass, and geothermal can minimize the utilization of fossils fuels and environmental issues. Among all renewable sources, solar energy has gained tremendous interest due to their abundant availability in most parts of the world and because they are free from pollution [1,2]. However, compared to conventional techniques for electricity generation, the cost of the electricity from a PV system is higher and this limits its application [3].…”

Section: Introductionmentioning

confidence: 99%

Performance and Design Optimization of Two-Mirror Composite Concentrating PV Systems

Liu

Tang

2020

Energies

Self Cite

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The reflectors of a linear solar concentrator investigated in this work consisted of two plane mirrors (2MCC), and they were designed in such a way that made all radiation within the acceptance angle (θa) arrive on flat-plate absorber, after less than two reflections. To investigate the performance of an east–west aligned 2MCC-based photovoltaic (PV) system (2MCPV), a mathematical procedure was suggested based on the three-dimensional radiation transfer and was validated by the ray-tracing analysis. Analysis indicated that the performance of 2MCPV was dependent on the geometry of 2MCC, the reflectivity of mirrors (ρ), and solar resources in a site, thus, given θa, an optimal geometry of 2MCC for maximizing the annual collectible radiation (ACR) and annual electricity generation (AEG) of 2MCPV in a site could be respectively found through iterative calculations. Calculation results showed that when the ρ was high, the optimal design of 2MCC for maximizing its geometric concentration (Cg) could be utilized for maximizing the ACR and AEG of 2MCPV. As compared to similar compound parabolic concentrator (CPC)-based PV systems, the 2MCPV with the tilt-angle of the aperture yearly fixed (1T-2MCPV), annually generated more electricity when the ρ was high; and the one with the tilt-angle adjusted yearly four times at three tilts (3T-2MCPV), performed better when θa < 25° and ρ > 0.7, even in sites with poor solar resources.

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Nocturnal reverse flow in water-in-glass evacuated tube solar water heaters

Cited by 44 publications

References 10 publications

Optimal Position of Solar Collectors: A Review

Optimal Position of Solar Collectors: A Review

Thermal and economic analysis of low-cost modified flat-plate solar water heater with parallel two-side serpentine flow

Performance and Design Optimization of Two-Mirror Composite Concentrating PV Systems

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