Convection suppression in horizontal solar collectors using density stratification

Article Abstract:

A simple laboratory experiment demonstrated a new method for convection suppression in flat solar collectors. The new technique applies density stratification to the space between the absorber and the cover of a solar collector through the input of highly-concentrated vapour near the absorber and low-concentrated vapour near the cover. The gradient is controlled by saturation vapour pressures at set temperatures whose guidelines were formulated during the study.

Measurement, Heat, Vapor pressure, Convection (Fluid dynamics)

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Calculation procedure for collectors with a honeycomb cover of rectangular cross section

Article Abstract:

Important parameters such as material choice, geometric dimensions and cell wall thickness should be taken into account in designing a highly efficient solar collector with honeycomb cover. The optical and thermal properties of the thermal absorber and the transparent cover, the two basic elements of a thermal solar energy component, are determined by observing the impact of parameter variations such as film thickness and aspect ratios on real material.

Design and construction

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Performance simulation of solar collectors made of concrete with embedded conduit lattice

Article Abstract:

A solar collector made of glass-reinforced concrete and embedded with a lattice of conduits paves the way to a low-cost solar energy collection. This type of collector differs from the conventional flat-plate thin-fin collector in its geometric and characteristic parameters. The low overall efficiency of this concrete collector is compensated by its low cost, making it possible to construct a collector of relatively larger surface area.

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