Study On Air Distribution And Temperature And Humidity Control During Heat Pump Drying Morchella

In recent years,the market demand for Morchella is increasing,and the drying and preservation of Morchella has become a problem to be solved.The existing baking room still has some problems,such as large range of temperature and humidity changes,serious energy waste,unstable product quality and so on.Air energy heat pump drying is an advanced drying technology,which not only protects the environment and saves energy,but also can more conveniently adjust its temperature and humidity.However,how to effectively control the temperature and humidity in the drying process of air energy heat pump to obtain high-quality and stable dried Morel products is a problem worth studying.Taking the air energy heat pump type Morchella baking room as the research object,this paper carries out theoretical analysis and Numerical Simulation Research on the air distribution of the heat pump type Morchella baking room,uses the professional HVAC system modeling software Phoenix to build a numerical model,sets different porosity and grid spacing between Morchella,divides and solves the area in the baking room,and analyzes and selects the air distribution simulation in the constant speed drying stage;The temperature and humidity in the Morchella drying room were analyzed by finite element analysis.The airflow organization of 6 different sections of Morchella in the constant speed drying stage was simulated,and the parameters such as the spacing between adjacent grids,the porosity of Morchella,temperature and humidity were determined to improve the drying effect of Morchella.The main conclusions are as follows:(1)In the constant speed drying stage,take z=0.5m,0.7m,0.9m,1.1m,1.3 m.The study on the 6sections of 2.0m shows that the airflow distribution of Morchella on the vertical section becomes more and more uneven with the decrease of the stacking height of Morchella.(2)The influence of the grid spacing of Morchella drying room on the total average wind speed and velocity non-uniformity coefficient in the drying room was simulated and analyzed.It is found that when the grid spacing is 9cm,the air distribution in the drying room is the best,and the velocity non-uniformity coefficient is the minimum.The average velocity decreases with the decrease of Morchella accumulation height,and the change of grid spacing has little effect on it.(3)Based on ANSYS,the temperature,humidity and the coupling relationship of temperature and humidity in the initial stage,constant speed and shaping stages of Morchella drying room are analyzed.The results show that the temperature and humidity distribution in the air inlet side of the drying room is relatively uniform(except the top),and the temperature meets the requirements of the drying process.On the side of the air outlet,there will be an area with great temperature and humidity changes on the left side of the air outlet because the wind will spread around when hitting the wall.Therefore,to change this situation,it is necessary to install a fan on the left side of the air outlet to drive the air flow on the left side of the air outlet and homogenize the temperature and humidity on the left side of the air outlet.For the coupled analysis of temperature and humidity,the change of humidity with constant temperature has little effect on the air distribution.The drying time of 22 h is more conducive to the storage of Morchella.