On the measurement of bond conductance in solar collector absorber plate

Badran, Ali A.; Mustafa, Mohammed F.; Dawood, Walid K.; Ghazzawi, Zaid K.

doi:10.1016/j.enconman.2008.01.041

Cited by 21 publications

(9 citation statements)

References 2 publications

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“…5 gives the efficiency profiles of the glass evacuated tube solar collector for the solar radiation intensity, I 0 ¼ 950 W/m 2 . It is observed that the present results are in accordance well with the references [11,13], indicating the one-dimensional analysis investigation is reasonable and can be used to analyze the thermal performance of the glass evacuated Experimental value [13] Computational value [10] In present study (T f -T a ) /I 0 Efficiency, …”

Section: Validation Of the Numerical Modelsupporting

confidence: 93%

“…In these studies, the bond conductance between the absorber plate and the U-tube was not considered, but for the realistic performance estimation, the thermal contact between the absorber plate and the U-tube is of paramount importance to conduct most of the heat collected by the absorber plate to the flowing fluid inside the U-tube. The bond conductance in solar collector absorber plate was investigated experimentally by Badran et al [10]. The temperature gradient in the air gap between the pipe and the plate is very large (The temperature difference between the pipe and the plate exceeds 50 C).…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

et al. 2010

Building and Environment

212

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Section: Validation Of the Numerical Modelsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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

Zhang

et al. 2010

Building and Environment

212

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“…There is air gap between the absorber tube and the copper fin, the thermal contact between the absorber plate and the U-tube is of paramount importance to conduct most of the heat collected by the copper fin to the working fluid inside the U-tube. The bond conductance between the absorber plate and the tube in solar collector was investigated experimentally by Badran et al [16]. The results show that the bond conductance of five samples used in the experiment ranged from 6.3 to 1.8 W/m K. The influence of air gap between the absorber tube and copper tube on thermal performance of U-tube evacuated tube solar collector was studied by Ma et al [13].…”

Section: Introductionmentioning

confidence: 97%

“…Two copper tubes (U-tube) are welded or wedged on both sides of the circular copper fin. At present, some researches on the thermal performance of evacuated tube solar collector with U-tube are reported [3,[14][15][16]. Sawhney et al [3] established the thermal performance model of evacuated tube solar collector with U-shaped fluid channel embedded in a flat absorber.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on thermal performance of filled-type evacuated tube with U-tube

Liang

Zhang

et al. 2011

Heat Mass Transfer

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The filled-type evacuated tube with U-tube, in which the filled layer is used to transfer energy absorbed by working fluid in the U-tube, is proposed to eliminate the effect of thermal resistance between the absorber tube and copper fin of the conventional solar collector. In this paper, the thermal performance of the filled-type evacuated tube was researched by means of experimental study. In order to avoid the effect of some uncertain factors, the single collector tube was considered as investigated objective. The test setup of the thermal performance of the filled-type evacuated tube with U-tube was established. The results show that the filled-type evacuated tube with U-tube has a favorable thermal performance compared with the evacuated tube with copper fin. The heat efficiency of filled-type evacuated tube is higher than that of copper fin evacuated tube by 12%. The useful energy gain of filled-type evacuated tube is 22% higher than that of copper fin evacuated tube at the practical irradiance received I T = 800 W/m 2 and flow rate M f = 0.005 L/s. In addition, the exergy efficiency of the filled-type evacuated tube is higher than that of copper fin evacuated tube.

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“…In [18], a new experimental method for the measurement of the bond conductance between the absorber plate and the tube of a solar collector was developed. The bond conductance is estimated based on the comparison between the energy generated and the energy absorbed.…”

Section: Solar Collector Parametersmentioning

confidence: 99%

Optimal flow control of a forced circulation solar water heating system with energy storage units and connecting pipes

2016

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Degree:Master of Engineering (Electrical Engineering)Keywords: Flat plate solar collector, flow rate optimization, maximum energy extraction, system thermal losses, thermal comfort.Solar water heating systems (SWHS) have fast become a suitable alternative to conventional water heating systems due to growing energy demands. A SWHS generally consists of a solar collector (which is used to convert solar radiation to heat), a water storage tank, and a flow control device such as a pump in the case of forced circulation SWHS. Extensive research and analysis on the operation and performance of these systems has been conducted, and results show that optimal flow control is an important factor that can be used to improve the performance and efficiency of SWHS.This study focuses on pump flow rate optimization for forced circulation SWHS with pipes.The system analyzed consists of an array of flat plate solar collectors, two storage tanks (one for the circulation fluid and one for the water), a heat exchanger, two pumps, and connecting pipes which are considered as one of the components of the SWHS so as to account for their thermal effects. The proposed model is developed using mainly the first and second laws of thermodynamics. The model is used to maximize the difference between the energy extracted from the solar collector and the combined sum of the energy extracted by the heat exchanger and corresponding energies used by the pumps in the primary and secondary loops. The objective function maximizes the overall system energy gain whilst minimizing the sum of the energy extracted by the heat exchanger and energy used by the corresponding pumps in the secondary loop to conserve the stored energy and meet the user requirement of water tank temperatures.The model is solved using the fmincon solver in MATLAB's optimization toolbox. When compared to other flow control techniques, in particular the most suitable energy efficient control strategy, the results of this study show a significant increase in the system's overall energy gain. The results also illustrate the effects of system pipe thermal losses for the different control strategies, hence highlighting the importance of developing a model that takes such losses into account so as to improve the overall accuracy of the model. Sonenergie-waterverwarmingstelsels (SWV) het vinnig 'n geskikte alternatief vir konvensionele waterverwarmingstelsels geword, weens die groeiende vraag na energie. 'n SWV bestaan gewoonlik uit 'n sonkollektor wat gebruik word om sonstraling om te skakel na hitte, 'n opgaartenk vir water, en 'n vloeibeheertoestel soos 'n pomp, in die geval van geforseerde sirkulasie SWV. Uitgebreide navorsing en ontleding op die werking en prestasie van hierdie stelsels is uitgevoer en die resultate toon dat die optimale vloeibeheer 'n belangrike faktor is wat gebruik kan word om die prestasie en doeltreffendheid van SWV verbeter. OPSOMMINGHierdie studie fokus op die optimering van die vloeitempo van 'n pomp vir geforseerde sirkulasie sonenergie-waterverwarmingste...

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On the measurement of bond conductance in solar collector absorber plate

Cited by 21 publications

References 2 publications

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

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

Experimental study on thermal performance of filled-type evacuated tube with U-tube

Optimal flow control of a forced circulation solar water heating system with energy storage units and connecting pipes

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