Thermal performance analysis of the glass evacuated tube solar collector with U-tube

Ma, Liangdong; Lu, Zhenneng; Zhang, Jili; Liang, Ruquan

doi:10.1016/j.buildenv.2010.01.015

Cited by 207 publications

(54 citation statements)

References 10 publications

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“…The procured results can be very well compared to the results presented by [8].The authors maintained very low mass flow rates of 0.001 kg/s, 0.002 kg/s and 0.003 kg/s and obtained efficiency of about 35-40% with higher radiation densities of about 950 W/m 2 . In the present work, it should be noticed that AG t and AWG t utilizes the same amount of energy and delivering almost same thermal instantaneous efficiencies.…”

Section: Resultssupporting

confidence: 60%

“…However, employment of bimetallic tube requires high investment and also the proposed tube has very large diameter (31.7 mm), which affect heat transfer rate. Performance analysis of selectively coated solar collector tube with U-tube by Ma et al (2010) [8] employing reticulation of working fluid presented results employing very less mass flow rate through the tube, while the tube had unexploited and considerable space to fit in another U-tube. Utilising the available space, performance of the tube could have been optimised.…”

Section: Introductionmentioning

confidence: 99%

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Absorber Tube with Internal Pin-Fins for Solar Parabolic Trough Collector

Kalidasan¹,

Shankar

Srinivas

2016

MATEC Web of Conferences

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Abstract. Solar parabolic trough collectors exploit solar energy for power generation in solar thermal power stations. These systems require long arrays of reflective troughs with absorber tube running along the axis of parabolic dish. A successful attempt to reduce the length of arrays was accomplished by experimentally analysing the modifications done in absorber tube. Two out of three tubes were fabricated and they were employed to obtain the performance parameters through experimentation conducted at VIT University, Vellore, India. Distilled water was used as the working fluid. Maximum efficiency of 39.12% was obtained at 451.6 W/m 2 of direct normal irradiance (DNI) for absorber tube with internal pin-fins and without glass tube (AFWG t ) compared to 8.15% obtained at same value of DNI and other conditions for simple absorber tube without glass cover (AWG t ). Cylindrical parabolic trough available at the university was utilized, providing the basis for designing and fabrication of the tubes. Plots for varying mass flow rate at interval of 10 minutes were made against instantaneous thermal efficiency and heat utilized, for direct normal irradiance vs. temperature difference across the tubes and instantaneous thermal efficiency. Through the experimentation conducted, better performance was procured compared to earlier works. Thus, the proposal infers that absorber tube with internal fins has good scope for its application, both domestically as well as industrially. It also calls for further research and development of proposed techniques so as to achieve better performance curves.

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Section: Resultssupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Absorber Tube with Internal Pin-Fins for Solar Parabolic Trough Collector

Kalidasan¹,

Shankar

Srinivas

2016

MATEC Web of Conferences

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“…Rather an overall loss from the inner tube of about 20% is assumed [15]. Radiative and conductive heat transfer losses from the whole system are considered when we discuss a specific design of a system with known dimensions and materials.…”

Section: Cfd Simulation Approachmentioning

confidence: 99%

Simulation of a Standalone, Portable Steam Generator Driven by a Solar Concentrator

2015

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Solar energy is a good solution for energy-deficiency problems, especially in regions such as rural areas in the Middle East that have not been electrified yet or are under electrification. In this paper, with the aid of a Computational Fluid Dynamics simulation, we propose a system that comprises a trough solar concentrator and a pipe-with flowing water-that is set in the concentrator focus. The aim of this work is to investigate the feasibility of generating steam from such a system as well as analyzing the generated steam quantitatively and qualitatively. Effects of variation of solar radiation intensity, ambient temperature, water flow rate and pipe diameter on the quantity and quality of the generated steam have been investigated. The results show that a quantity of about 130 kg of steam could be generated per day with a 0.01 m diameter with 0.0042 kg/s flowing water, although qualitatively, a narrower pipe achieves better performance than a wider one. About 74 kg of daily accumulated steam mass with a temperature >423 K could be achieved for a 0.005 m diameter tube compared to about 50 kg for the 0.01 m diameter tube. Steam quality factor is higher at all flow rates for the 0.005 m diameter tube compared to that of 0.01 m.

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“…Generally, the heat loss coefficient and the heat transfer coefficient cannot be predicted effectively because they relate to environment and quality of production, and the parameters, such as T p , T g , and T sky were not easy to be tested. In some reference, the values were given as a constant value [8], [9]. In consequence, it was a simplified and feasible way to calculate the real heat loss coefficient of solar collector according to heat balance equations, which was described in the following.…”

Section: A Physical Model and Heat Transfer Modelmentioning

confidence: 99%

Testing on the Transient Heat Loss Coefficient of All-Glass Evacuated Tube Collectors in Severe Cold Areas

Liu¹,

Jiang²,

Yang³

2015

JOCET

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Abstract-The insulation features and the heat dissipation was important factors that influence the utilization of all-glass evacuated tube collector, especially in severe cold areas. The heat loss coefficient of evacuated tube collector was usually tested in given conditions, which was inapplicable for actual conditions. In this paper, further study was conducted base on the previous research of anti-freezing strategies of solar collecting loop in sever cold areas.

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Thermal performance analysis of the glass evacuated tube solar collector with U-tube

Cited by 207 publications

References 10 publications

Absorber Tube with Internal Pin-Fins for Solar Parabolic Trough Collector

Absorber Tube with Internal Pin-Fins for Solar Parabolic Trough Collector

Simulation of a Standalone, Portable Steam Generator Driven by a Solar Concentrator

Testing on the Transient Heat Loss Coefficient of All-Glass Evacuated Tube Collectors in Severe Cold Areas

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