Experimental Investigation of Drying Cabinet of a Solar Dryer
摘要
Renewable energy is transforming the energy landscape by significantly reducing the cost of fuel, enhancing affordability, and improving emission control. Solar energy, as a renewable energy source, can be used in different fields of application. Drying of agricultural products is essential for preserving their quality and improving the shelf life by inhibiting the growth of bacteria. Drying methods vary from traditional open sun drying to energy-intensive industrial processes. Solar energy is one of the alternative ways of conventional energy sources for the solar drying technique to reduce drying time, cost, and fuel consumption. The technological challenge is to enhance the drying cabinet temperature of the solar dryer for an effective and efficient way of drying the products. In this research domain, incorporating a solar dryer that comprises of two Double Pass Solar Air Heaters connected in series, a blower, a heat exchanger for energy storage with PCM-based storage material and a forced-convection mixed-mode drying cabinet which combines both direct solar irradiation and preheated air by mechanical means of airflow to increase the drying cabinet temperature. The drying cabinet temperature inside the chamber varies from 37 to 53 °C with an average of 47.17 °C. The drying cabinet temperature is observed to be highest for 0.02 kg/s mass flow rate. The relative humidity inside the drying cabinet lie between 18 and 55%. Sliced ginger (5 kg) was taken for the drying experiment inside the drying cabinet. The moisture content gets reduced from 83.62% (w.b.) to 6.6% (w.b.) in 3 consecutive days.