The is not directly exposed to solar radiation to minimize discolouration and cracking on
the surface of the . Goyal and Tiwari (1999) have proposed and analyzed reverse absorber
cabinet dryer (RACD). The schematic view of RACD is shown in Fig. 4. The drying chamber
is used for keeping the in wire mesh tray. A downward facing absorber is fixed below the
drying chamber at a sufficient distance from the bottom of the drying chamber. A
cylindrical reflector is placed under the absorber fitted with the glass cover on its aperture to
minimize convective heat losses from the absorber. The absorber can be selectively coated.
The inclination of the glass cover is taken as 45o from horizontal to receive maximum
radiation. The area of absorber and glass cover are taken equal to the area of bottom of
drying chamber. Solar radiation after passing through the glass cover is reflected by
cylindrical reflector toward a absorber. After absorber, a part of this is lost to ambient
through a glass cover and remaining is transferred to the flowing air above it by convection.
The flowing air is thus heated and passes through the placed in the drying chamber. The is
heated and moisture is removed through a vent provided at the top of drying chamber
(Sharma et al., 2009).