外文翻譯---果蔬太陽能干燥脫水裝置設(shè)計(jì)-資料下載頁
2025-01-16 12:07本頁面
【正文】 auses the higher solar energy utilization efficiency. Based on BrinkmanForchheimer Extended Darcy model and energy twoequation model with internal heat source for saturated porous medium kE turbulent model, the flow and heat transfer characteristics of solar greenhouse system are simulated. Additionally, the influence of the porous wall with layered porosity on the characteristics of the greenhouse is also analyzed by numerical simulation further. The results show that the inlet parameters of the greenhouse and the structure of the porous wall have great effect on the temperature field, the flow field and the pressure field. So, for a certain structure of the greenhouse, the porous wall should be designed and the fan operation should be also conditioned reasonably according to the admired thermal environment in the greenhouse.Two kinds of new solar heating systems with a new porous heat storage wall are designed, which have different ventilation patterns. Based on kE turbulent model, BrinkmanForchheimer Extended Darcy model and energy twoequation model for saturated porous medium, the coupled heat transfer and flow characteristics in the new solar heating system are simulated, analyzed and pared. The results show that ventilation pattern has great effect on temperature field and flow field, which also has important influence on the insulation of the heating system and the thermal efficiency of the porous heat storage wall. Thus in real applications, the solar heating system with porous heat storage wall should be designed properly in order to increase the thermal efficiency of porous solar wall and decrease the heating price for porous simulating wall. The flow field and temperature field are available by the flow and heat transfer in two kinds of porous solar wall heating system with partial and slope under floor distribution system, respectively. The effect of the structure and air supply vent dimension of the under floor distribution system on flow field and temperature field are analyzed. The effect of the south wall on the temperature in the heating room also is studied. The results show that uniform temperature field and flow field in the heating room can be ensured by using the under floor distribution system, while the slope under floor distribution is good to obtain uniform mass flow rate for every supply air vent. In real applications, the south main wall of building should be insulated to prevent the phenomenon of heaterode.Based on the mathematical model used to describe the structure filled with uniform and equal diameter porous balls, the structure characteristics of porous solar wall are investigated further. The results show that the flow resistance will decrease with an increase in particle diameter and porosity. The results also provide parameters for an optimization of the porous wall.The porous solar wall experiment system is also designed, which can be used to investigate such performance parameters as the flow resistance of the porous solar wall system, the absorptivity and volume convection heat transfer coefficient of the porous wall etc. But simulation of solar radiation is so difficult that the porous solar wall experiment system should be developed further to test the thermal performance of the porous wall accurately.KEY WORDS： Solar drying， Forced convection， Greenhouse drying
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