Applications Of Computational Fluid Dynamics In Mechanically Ventilated Multispan Plastic Greenhouse Research In North China

The cooling effects of mechanical ventilation of Huaber-type multispan plastic greenhouse without plant are experimentally studied in summer. Under the experimental conditions,A three dimensional CFD model for mechanically ventilated Huaber-type multispan plastic greenhouse is established. And the 3-D CFD model is used to forecast the velocity and temperature distributions in a mechanically ventilated Huaber-type multispan plastic greenhouse, the predictions were checked against the measurements inside the experimental glasshouse and CFD was considered practicable. The 3-D CFD model is developed to simulate the cooling effects of mechanically ventilated Huaber-type multispan plastic greenhouse in Huabei area. Subsequently, CFD was used to investigate the influence of the length of the greenhouse, exit air velocity and cooling pad position on the internal airflow pattern in the same house.Under the experimental conditions, the average indoor air temperature is 5.62# lower than that of without mechanical ventilation, the largest air temperature difference is 10-12#.The result show the decreasing of entry air velocity and the increasing of cooling pad position have a advantage in the greenhouse cooling.Under the experimental conditions,A three dimensional CFD model for mechanically ventilated Huaber-type multispan plastic greenhouse is established.The model was steady state,the standard k- model was used to simulate turbulence.Then use the 3-D CFD model to forecast the the internal airflow pattern with different sizes and position of the cooling pad. the predictions were checked against the measurements inside the experimental glasshouse and CFD was considered practicable.The Applications of computational fluid dynamics in mechanically ventilated glasshouse research are studied with the checked CFD model. Different greenhouse length, cooling pad sizes and position are taken in account. The controllable distance of the Huaber-type multispan plastic greenhouse in Huabei area is presented.