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Research Papers

Effect of the Water Storage Tank Coverage With an Outer Glass Tube on the Thermal Performance of an Integrated Collector Storage Solar Water Heater

[+] Author and Article Information
Monia Chaabane

Unité de Thermique et Thermodynamique
des Procédés Industriels,
Ecole Nationale d'Ingénieurs de Monastir,
Route de Ouardanine,
Monastir 5000, Tunisie
e-mail: monia.chaabane@yahoo.fr

Hatem Mhiri

Unité de Thermique et Thermodynamique
des Procédés Industriels,
Ecole Nationale d'Ingénieurs de Monastir,
Route de Ouardanine,
Monastir 5000, Tunisie
e-mail: hatem.mhiri@enim.rnu.tn

Philippe Bournot

IUSTI,
UMR CNRS 6595,
5 Rue Enrico Fermi,
Technopôle de Château-Gombert,
Marseille 13013, France
e-mail: philippebournot@yahoo.fr

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: Including Wind Energy and Building Energy Conservation. Manuscript received September 2, 2013; final manuscript received June 2, 2014; published online August 25, 2014. Assoc. Editor: Werner Platzer.

J. Sol. Energy Eng 137(1), 011009 (Aug 25, 2014) (10 pages) Paper No: SOL-13-1246; doi: 10.1115/1.4028143 History: Received September 02, 2013; Revised June 02, 2014

The thermal performance of an integrated collector storage solar water heater (ICSSWH) is numerically examined using the numerical software Fluent 6.3. As this solar system presents the disadvantage of its high night thermal losses, a new strategy helping to reduce these losses is proposed. A particular system in which the storage tank is covered with an outer glass tube is studied and a parametric study is conducted in order to evaluate the optimal air spacing gap between the water tank and the covering glass tube which minimizes this system's heat losses. A 3D computational fluid dynamics (CFD) model interpreting this modified system is so developed and its thermal performance is compared to that of the noncovered tank based ICSSWH. The analysis of these solar systems daily performance shows that the modified ICSSWH is able to generate more thermal output and presents the advantage of its lower thermal losses. Regarding the night operating, this covered tank based ICSSWH is shown more effective in retaining higher temperatures for longer period, resulting so in lower night thermal losses. Results also suggest that the best performance corresponds to the lowest air gap spacing (L = 0.005 m).

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References

Figures

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Fig. 1

(a) Description of the ICS1 design of SWH and (b) description of the ICS2 design of SWH

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Fig. 2

(a) Cross section of the generated mesh for the ICS1 design of SWH and (b) cross section of the generated mesh for the ICS2 design of SWH

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Fig. 3

Variation of solar radiation and ambient air temperature experimentally measured by Chaouachi and Gabsi [1]

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Fig. 4

Validation of numerical results with experiments

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Fig. 5

Daily variation of the solar irradiance estimated by the Fluent solar calculator

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Fig. 6

Effect of the storage tank coverage with a glass tube on the ICSSWH thermal performance

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Fig. 7

Daily temporal evolution of the glass tube temperature

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Fig. 15

Comparison of the thermal losses coefficient during the night of the ICS systems with and without storage tank coverage with a glass tube

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Fig. 14

Night temporal evolution of the glass tube temperature

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Fig. 13

Effect of the tank coverage with a glass tube on the night evolution of the water temperature

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Fig. 12

Temperature contours at 12 h for a cross section at the plane z = 1 of the ICS2 designs of SWH of air spaces L = 0.005 m and L = 0.015 m

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Fig. 11

Streamlines and temperature contours at 18 h for a cross section at the plane z = 1 of the ICS1 and ICS2 designs of SWH

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Fig. 10

Streamlines and temperature contours at 14 h for a cross section at the plane z = 1 of the ICS1 and ICS2 designs of SWH

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Fig. 9

Streamlines and temperature contours at 7 h for a cross section at the plane z = 1 of the ICS1 and ICS2 designs of SWH

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Fig. 8

Effect of storage tank coverage with a glass tube on the ICSSWH daily averaged thermal efficiency

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