Design And Fabrication Of Solar Air Hea

Topics: Orders of magnitude, Glass, Sun Pages: 8 (400 words) Published: January 10, 2015

Schematic view of
experimental set-up


Experimental set up

Two solar air heaters (s1 and s2) of same
specific dimensions
have been designed and fabricated to
supply hot air for drying
and space heating. Both air heaters were
experimentally tested
individually for their thermal performance
on different configurations.
Plywood of 1 cm thickness was used for
the fabrication of both solar air heaters

The specific area of absorber tray was
151 53 cm2 which has been made of by using a
0.5 mm thick
22 SWG Al sheet. The absorber tray was painted
dull black to store
the maximum amount of solar energy for s1. To
reduce the heat
losses, a 2 cm thick layer of glass-wool was
placed between the absorber
tray and outer cabinet. A single pane transparent
float glass
of 0.3 cm thickness and 151 70 cm2 was used for
glazing to allow
the solar radiation inside the SAH. The single
glazing has been considered

effecting elements of the system like as halogen lights, inside wall of ducts for good reflection, and mainly the absorber tray are required
to be very clean while performing (a float glass, beneath
which the granular carbon is spread of heat storing for long hours) and for efficient working in good and poor ambient conditions. Dusty transparent glass over storage media and dusty reflective walls will be resulted in lower efficiency of the system. Double glazing makes the system a little bit complicated in comparison of discussing system and more maintenance and attention will be required

The distance between glazing and absorber tray was 10 cm for

both heaters. A layer of granular powder of 1 mm was spread on

the absorber tray and sealed by 2 mm float glass for s2 (Fig. 2).

The side walls of SAH were tilted at 115o angle because of receiving

good amount of solar radiation through its exposed area. For air

supply two similar high velocity table fans (40 W) of ‘‘CINNI-20

CR’’ trademark were used to supply the air inside the SAH. The

speed of air supplying was set at 2 m/s for forced convection. The

speed of the fan can be controlled by a knob (provided with fan)

which was fixed on 3 inbuilt control voice; low speed –

1750 RPM, mid speed – 1980 RPM, and high speed – 2200 RPM.

Even this speed can also be varied up to 2500 RPM by supplying

a high voltage of current supply, through an external stabilizer

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