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Solar Air Drying is one of the oldest method of food preservation. For several thousand years people have been preserving grapes, herbs, Potato’s, corn, milk, fruits, vegetables, spices, meat and fish by drying. Until canning was developed at the end of the 18th century, drying was virtually the only method of food preservation. It is still the most widely used method. Solar Drying is an excellent way to preserve food and solar food dryers are an appropriate food preservation technology for a sustainable world. This technology makes it possible to dehydrate and preserve food professionally without compromising on quality, color, texture, enzymes, vitamins, taste and nutritional values of foods in the process. Food scientists have found that by reducing the moisture content of food to between 10 and 20%, bacteria, yeast, mold and enzymes are all prevented from spoiling it. India is blessed with an abundance of sunlight, water and biomass. Vigorous efforts during the past two decades are now bearing fruit as people in all walks of life are more aware of the benefits of renewable energy, especially solar energy in villages and in urban or semi-urban centers of India. Industries that can benefit from application of solar energy to heat air are Food, Textiles, Dairies, Pharma and Chemical. This paper reviews the present scenario of Solar Air Dryer and strategies for future developments in India.

The aim of present study is to investigate and analyzed the thermal properties of TiO2 composite material, by using the comparison method of pin fin heat exchanger. The thermal properties of TiO2 composite material can easily been find out by pin fin heat exchanger.Here it is used the plane copper material to coat the TiO2 composite material because of the good thermal conductivity of the copper. In the present paper we are going to compare the plane iron rod for pin fin heat exchanger with the extended surface of the TiO2 composite material in pin fin heat exchasnger. By analyzing and evaluating the thermal properties of TiO2 composite material it is developed the material of good thermal conductivity and higher thermo mechanical properties of material for the manufacturing the pin fin heat exchanger.