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Technical Brief

Numerical Simulation, Design, and Construction of a Double Glazed Compound Parabolic Concentrators-Type Integrated Collector Storage Water Heater

[+] Author and Article Information
Hamdi Kessentini

Laboratoire de Matériaux,
Optimisation et Energie pour la Durabilité (MOED),
Ecole Nationale d'Ingénieurs de Tunis (ENIT),
Université de Tunis El Manar,
Tunis 1002, Tunisia
e-mail: hamdi.kessentini@gmail.com

Chiheb Bouden

Professor
Laboratoire de Matériaux,
Optimisation et Energie pour la Durabilité (MOED),
Ecole Nationale d'Ingénieurs de Tunis (ENIT),
Université de Tunis El Manar,
Tunis 1002, Tunisia
e-mail: chiheb.bouden@enit.rnu.tn

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 27, 2013; final manuscript received October 26, 2015; published online December 18, 2015. Assoc. Editor: Werner Platzer.

J. Sol. Energy Eng 138(1), 014501 (Dec 18, 2015) (7 pages) Paper No: SOL-13-1282; doi: 10.1115/1.4032141 History: Received September 27, 2013; Revised October 26, 2015

The numerical simulation, design, and construction of a double glazed integrated collector storage (ICS) with compound parabolic concentrators (CPC) reflectors are presented. The design of the double glazing is optimized by means of numerical simulations under Tunisian climatic conditions. The numerical program used for the simulation consists on the transient resolution of the balance energy equations of each component of the solar water heater. Different proposed models of a double glazing are studied and compared with a reference case of a single glass ICS model. The simulation results have shown that the use of double glazing with argon layer and low-e coated lower glass instead of one glass cover significantly improves the thermal behavior of the ICS heater and visibly reduces its thermal losses during night. Taking into account these numerical results, a double-glazing ICS prototype-collector is constructed. The details of the construction, geometry, optical properties, and dimensions of the prototype are presented.

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References

Figures

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Fig. 1

Heat fluxes in a cross section of the ICS solar heater

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Fig. 2

Flow chart of the simulation program for ICS systems

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Fig. 3

Measured versus predicted average water temperatures in the storage tanks for a sequence of five days without water drain (mean ambient temperature is about 30 °C and a peak solar radiation of 1000 W/m2). Top: lower placed tank, Bottom: upper placed tank.

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Fig. 4

Variation diagrams of the predicted mean daily, diurnal efficiency, and heat losses of the double glazed ICS system. (a) Diurnal efficiency, (b) daily efficiency, and (c) heat losses.

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Fig. 5

Theoretical variation of storage tanks water average temperature for a sequence of five days

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Fig. 6

The constructed double glazed ICS solar heater: (a) cross-sectional view and (b) photo of the ICS heater

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