Case Study


Overview :

Status: experimental Heating Mode: direct

Type: chamber dryer Air circulation: natural convection

A specific example of the performance obtainable with a solar cabinet dryer is given in this case study. The model was built and tested for the particular climatic conditions of Kanpur, India. Comparison ia made of the drying rates and final product quality with those obtained by drying in the open sun. The experimental work deals with the drying of several fruits and vegetables in common use throughout India.


This solar cabinet dryer was designed for Indian climatological and economic conditions« using materials readily available at the local market. The optimum tilt of the dryer was found to be 13°15' in summer and 40° in the winter at Kanpur location. The principles of operation are described in the preceeding case study.

Dimensions: see plans on figure 1

Materials of Construction: Drying Chamber

Transparent Cover: glass Frames: Indian chir wood

Insulation: locally available wood-wool

Trays: wire mesh on wooden frame

Location: campus of the Indian institute of Technology Kanpur, India

Longitude: 80°22'E

Latitude: 26°26,N

Climatological Data:

Maximum temperature in sunnier 4S°C

Minimum temperature in winter 10°C

Hours of sunshine per year 4000 Days of no sunshine per year 30

Practical Operation:

Number of units used in the past; two Number of units currently in use; none

Periods of Operation:

The dryer was used on experimental basis only from July 1971 to July 1972.

Figure 1 Plan of the Cabinet Dryer
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