Development And Experimental Study Of Solar And Heat Pump Equipment Combined Drying Of Agricultural Products

Solar drying is more energy-saving methods in agricultural drying method, but because of the solar energy discontinuity and instability, the single use of solar energy drying would significantly reduce drying efficiency; And because of the complexity of th e diversity and properties of agricultural materials, a single solar drying it is difficult to meet the quality requirements of dry goods, the approach is often used in combination with other energy sources, new energy development and utilization of this paper and energy conservation perspective, often used in combination with other energy sources. In this paper, based on the new energy development and energy saving and emission reduction, this paper is from the perspective of new energy development and utilization and energy saving and emission reduction, which is based on the demand of farmers in Zhanjiang, using the device to drying experiments of white radish, verify the drying effect of the device, the results show that the drying device of the economic and reliable operation, and has good drying effect of agricultural products. The main conclusions of this paper are as follows:?The designing of solar energy-heat pump drying system, and the heat capacity of 15 kg was calculated, in order to match the design of the solar collector system and heat pump hot water system, identifying components and set drying system heat the area, the design of the structure of the system and the selection of the standard parts are determined. Calculation results show that the disposable dry 15 kg of bai luobo need solar panels area of 2.7 m2, gree, heat pump water heater is used in the heat pump system, the host model KFRS- 3.1 J/A3, with a tank about 150 L can meet the requirements of drying.?Set the solar energy-heat pump drying test bench, and with the performance of the experiment station experiments and analysis, draw the conclusion: The white radish cut into strips with the same size of the quality and the same treatment was dried to a moisture content of 8%, solar drying unit energy consumption than heat pump drying, energy-saving rate of about 51%, a significant reduction in operating costs; comparative results after dry material qualityIt can be drawn when the solar drying dehumidifiers do not need to work, either to dry quality requirements, and energy conservation. After comparing the results of the dry-quality materials, It can be concluded that the solar drying process does not need to work in the wet machine, which can meet the requirements of the dry quality and save energy. And heat pump dry hot and humid air circulation space is only dry room, do not have to pump the work will reduce the drying rate, and the material in the high temperature and humidity, easy to decay, the quality of dry.?White radish as raw material, the use of this device were carried out experimental study alone solar drying and dry heat alone, solar energy + heat pump combined drying experiments, temperature curves obtained and dried under the curve corresponding to dry conditions, white radish and dried to obtain critical a moisture content of about 14. Study also showed that: ?using solar drying alone, material moisture content at 22 h around a turn, began to slow down stage of drying, the drying time is about 26 hours can reach the safety of the green radish dry moisture content; ? using heat pump drying alone, material moisture content in 17 hours turning point, after enters the falling rate drying stages, the drying time is about 21 hours can reach the safety of the green radish dry moisture content; ?solar energy + heat pump drying, material moisture content in the 21 hours turning point, after enters the falling rate drying stages, drying time is about 25 hours can achieve green radish dry safe moisture content.