Study On Dry Walnut Of Air Source Heat Pump Combined With Solar Energy System

The main economic crops in Dali Yangbi county is walnut. Due to rapid oxidation of its surface will be picking fresh walnut peeling, and placed a few days later the nuts will mildew. So usually need for fresh walnuts drying and then with storage, processing and sale. Most of the way in the local used for natural drying and coal flue curing barn. Not only the long drying time, drying quality in general and serious pollution of the environment. In this thesis, in view of the above problems, the following contents:1. Material drying process of the 2 theories, in order to understand the nature of walnut drying, effect of drying medium at different temperature, humidity of walnuts drying was studied, the results show that the drying temperature, drying process and the walnut color quality greatly, The humidity had certain influence on the early stage of the drying, later effect weakened.And select three thin layer drying model using Origin software to fit the drying process, the comparison that page model is more consistent with the.2.According to the climate characteristics of Dali local, for environmental protection, energy saving point of view, take the solar air heat collector and heat pump combined drying, and the drying conditions and work selected mode of solar energy heat pump combined drying system is designed and calculated, according to the collector area determine the thermal load needed in the condenser, heat pump system; the evaporator area; the heat pump compressor power etc.3.Through the analysis on the 3 day, using three factors and three levels orthogonal method, comparison of drying time and drying quality two factors are the best drying technical scheme. Two groups of real bunker experiment using the best drying technical scheme with the insolation experiment to compare. Analysis of the experimental results, the best drying technical scheme in a short time, the drying effect is good, the final state of moisture content conforms to the standard.4.The solar heat pump combined drying system was analyzed and its performance was tested. Solar air collector temperature to ensure efficiency and collector instantaneous high thermal efficiency, which belongs to a high-efficiency collector. Heat pump system COP is greater than 2. Combined drying system can provide character drying requirements of the hot dry air to the drying box continuous stable.5. From the energy consumption, economic, social benefits point of feasibility analysis of using solar energy combined heat pump drying system of walnut.