Abstract: . . .  substantial annual savings of about 50 tons of fire wood amounting to Rs. 1.25 lakhs per annum. The capital investment of this system was about Rs 14.0 lakhs. After depreciation benefits, the pay back period for this project works out to about 3 years. III Solar concentrating cooking: A concentrating type solar cooker will have sun rays focused into a focal point where heat is concentrated and used for cooking. The system has aluminium as reflecting material with reflectivity over 80%, which helps in concentrating the heat at the focal point. The maximum temperature achieved at the bottom of vessel would . . .
. . .  for various process heating requirements. One such example is that of tea drying. For tea drying, conventional drier is normally used with fuels such as firewood, coal, furnace oil and briquette etc. This can be replaced with solar air heating system. Case study: In one of the tea factories, a solar air heating system of 383 m 2 area has been installed to provide hot air for tea drying. The temperature required for drying is about 105 o C. The installed capacity of the system is 35,000 kg/hr air at 20 o C above ambient temperature. This system operates for about 3500 hours in a year. It has resulted in . . .
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