Optimization Research Of Solar Energy Thermally Coupled Heat Pump Drying System Operation

Drying technology is an industry that consumes a lot of energy. In the developedcountries, about10%～20%of the fuel was used in drying process.With the shortage ofresources and the deterioration of the environment, Heat Pump Drying technology was widelyused today because of its high-efficiency of the energy-saving,non-pollution of theenvironment，and the low cost. In addition, because the solar energy is pollution-free and canbe gained easily, so the coupling drying system which couples Heat Pump Drying technologywith the solar energy heating technology can largely reduce electricity energy consumption.So，it has profound significance to optimize the operation of solar energy heating couplingwith Heat Pump Drying system.The paper uses CFD software to design the shape of the Heat Pump drying chamber andthe position of the guide wind panel. The numerical calculating was done in order to imitateand analyze the temperature field and the velocity field of the air. The result shows that whenthe guide wind panels left expand and incline at an angle of10o to the horizontal，thedistribution of the temperature field and the velocity field in drying chamber was mostreasonable，as the same time，the material can be heated evenly.The study of the heat conduction and mass transfer model as the basis, the large-scalemushroom drying production system as the prototype, this paper that manufactures a couplingdrying system of heat collecting area of16.8m2solar energy heat collector and an air sourceheat pump with rated power of22kW, tests the performance of the solar energy-heat pumpequipment, experiments on the mushroom drying by five different drying patterns：independent drying, combined drying, intermittent drying and so on. And then analyzes andevaluates the factors such as color, fragrance, overall drying time, and energy consumption indifferent drying patterns, and finally gets the most optimal mushroom drying technology.The experiment shows that under the different experimental conditions, the thermalefficiency of solar energy heat collector can be closed to56%averagely, and the average COPof the Heat Pump system can reach5.0. The solar energy independent drying technology cansave more than84%of the energy and shorten about22%of the overall drying time；theintermittent drying technology can save more than66%of the energy and shorten about27%of the overall drying time, besides, the mushroom quality can be maintained well.