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A numerical investigation of a solar greenhouse tunnel drier (SGTD) has beenperformed. In the present study, the geometry of the tunnel roof is assumedsemi-circular which is covered with a UV (200\mu) stabilized polyethylene film.The simulated SGTD reduces moisture of copra from 52.2% to 8% in 55 h underfull load conditions. A system of partial differential equations describingheat and moisture transfer during drying copra in the solar greenhouse dryerwas developed and this system of non-linear partial differential equations wassolved numerically using the finite difference method (FDM). The numericalsolution was programmed in Compaq Visual FORTRAN version 6.5. The simulatedresults reasonably agreed with the experimental data for solar drying copra.This model can be used to provide the design data and is also essential foroptimal design of the dryer. For instance the user is able to change theradiation properties of the roof cover for different materials of roof cover.

Numerical investigation of a solar greenhouse tunnel drier for drying of copra