Performance of a collector/storage solar water heater

Sodha, M. S.; Nayak, J.K.; Kaushik, S.C.; Sabberwal, S.P.; Malik, M. Afzaal

doi:10.1016/0013-7480(79)90015-9

Cited by 34 publications

(4 citation statements)

References 3 publications

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“…It was also observed that, with a wide range of working fluids, the system performs better with loading conditions than without loading condition. Comparatively high storage water temperature rises were attained corresponding to 60 • C to 85 • C attained by other systems incorporating heat pipe arrays of more than 20 heat pipes [1,3,24,25], and other conventional evacuated tube solar hot water systems not incorporating heat pipes [26][27][28][29].…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Archives of Thermodynamics

Al-Joboory¹

2020

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The present work involved an extensive outdoor performance testing program of a solar water heating system that consists of four evacuated tube solar collectors incorporating four wickless heat pipes integrated to a storage tank. Tests were conducted under the weather conditions of Baghdad, Iraq. The heat pipes were of 22 mm diameter, 1800 mm evaporator length and 200 mm condenser length. Three heat pipe working fluids were employed, ethanol, methanol, and acetone at an inventory of 50% by volume of the heat pipe evaporator sections. The system was tested outdoors with various load conditions. Results showed that the system performance was not sensitive to the type of heat pipe working fluid employed here. Improved overall efficiency of the solar system was obtained with hot water withdrawal (load conditions) by 14%. A theoretical analysis was formulated for the solar system performance using an energy balance based iterative electrical analogy formulation to compare the experimental temperature behavior and energy output with theoretical predictions. Good agreement of 8% was obtained between theoretical and experimental values.

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Section: Discussion Of Resultsmentioning

confidence: 99%

Archives of Thermodynamics

Al-Joboory¹

2020

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“…The change in m, say from 8 to 7, affects the gasdynamic voltage drop estimation by about 26 per cent which is practically the same for different values of Po in the range studied. In order to understand the above dependence of gasdynamic voltage drop on m physically, we look at various velocity profiles generated by choosing different values of m. As studied by various workers (Lengyel, 1969;Jayakumar et al, 1978;Sodha et al, 1979), one interprets the exponent l / m used to describe the velocity profile as a direct measure of boundary layer thickness. If l / m increases (m decreases), the velocity profile becomes less steep giving rise to a thicker boundary layer and vice versa.…”

Section: Resultsmentioning

confidence: 99%

Effect of velocity profile models on the gasdynamic voltage drop in open-cycle mhd generators

Gupta

Joshi

Rohatgi

1982

Int. J. Energy Res.

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In MHD generator channels, the actual gas flow is often approximated by a certain hydraulic flow model which requires an appropriate empirical velocity profile model. The existence of a general 1/m‐power law for the velocity profile with m varying from 6 to 8 in small‐scale MHD generator channels has been discussed. The effect of change in m giving rise to various velocity profiles on the gasdynamic voltage drop has been studied. It is found that the gasdynamic voltage drop is affected considerably by changing the power law for the velocity profile, demanding an appropriate velocity profile model for the analysis of data.

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“…The optimum distance between the lower and upper plate of the heater was found to be 10 cm. Sodha et al, [13] presented an improved analysis of a collector and storage solar water heater arrangement which consisted of an insulated rectangular tank measuring (1.22*0.9*0.2) m with its top surface suitably blackened and covered with glass. In this system the collector acted as a storage tank.…”

Section: Introductionmentioning

confidence: 99%

Improve the Performance of Integrated Collector Storage-Solar Water Heater by using Glazing Confined Air Space: A Numerical Simulation Approach

Angham Fadil Abed,

Noora A. Hashim,

Muna Hameed Alturaihi

2024

ARFMTS

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A numerical study is presented by double-glazed the conventional rectangular integrated collector storage-solar water heater with internal obstacle in the storage container which improving the performance and making them convenience for household uses. A three-dimensional, laminar and unsteady numerical simulation with the aiding of COMSOL 5.5 software is used to investigate three shapes of integrated collector storage-solar water heaters (single glazed, double glazed, and double glaze-obstacle). The governing equations which represented of conservation equations of mass, momentum and energy. The performance of these systems was tested along two days in February and July during different atmospheric conditions at Kufa-Iraq. In these days, the water temperature reached a maximum value of 61.02 ℃ for no-load condition when the tap temperature was 39.3℃. Obstacle and glazed integrated collector storage –solar water heater shows the higher performance as compared with the two other heaters with a maximum value of instantaneous efficiency of 59.95 % in February.Also, the average Nusselt number and heat transfer between the absorber plate and confined air decreases and this increase a storage water temperature. In general, the total efficiency under no-load conditions is lower than on load case. The results were compared to previous theoretical and experimental work and show a good agreement with a maximum error that not exceeds to (4.24 %).

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Performance of a collector/storage solar water heater

Cited by 34 publications

References 3 publications

Archives of Thermodynamics

Archives of Thermodynamics

Effect of velocity profile models on the gasdynamic voltage drop in open-cycle mhd generators

Improve the Performance of Integrated Collector Storage-Solar Water Heater by using Glazing Confined Air Space: A Numerical Simulation Approach

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