Studies On Optimizing And Combining Of Effect Factories About Dehumidifying And Cooling Temperature To Greenhouse

With rapidly developing of vegetable, flower, basin-scenery and sapling industry, the greenhouse produce and cultivate model has been generally popularized and used. As a semi-closed system, greenhouse's temperature adjust function is very limited, especially when it is summer in a high temperature and high humidity area, the strong " greenhouse effect" will influence seriously crop's normal growing. At present, many experts from home and abroad have done much research on it, and acquired some research outcome. Aim for climate peculiarity and production practice in high temperature and high humidity area, combing with the current greenhouse cooling situation at home and the basic situation of my country, this paper brings forward a new project ?liquid spray dehumidification system on the base of research of former people so as to obtain marked cooling effect.The liquid spray dehumidification system improves the former wet curtain-ventilation system. Which first let air be sprayed and dehumidified with CaCh solution when the outdoor air enters the greenhouse in order to lower the relative humidity, then let the air that has been dehumidified run through wet curtain to evaporate and cool down.On the base of a theoretical analysis about the theory of liquid dehumidification cooling and the mechanism of conduction between the surface of the air and the dehumidification liquid, the paper designs the liquid dehumidification cooling system, and arranges prominence verification experiment to the factors which influence the effect of dehumidification and cooling temperature.According to theoretical analysis and transact result to test data analysis, the outlet air's relative humidity is significantly influenced by the four factors that are the entrance air's temperature, entrance air's relative humidity, solution's temperature and solution's concentration. When solution's flow is 3.478 X lO'W/s, entrance air's flow is 1.764m3/s, the best proportion of air and solution is 5.072 X 103, and a math model about above the significant factors that influence dehumidification and cooling effect can be established: 4= - 202.45 + 6.325ta+ 2.8125ha + 0.375ts+ 1.8125cs- 0.0625taha- 0.0625tacshQ is outlet air's temperature, ta is entrance air's temperature, ha is entrance's air relative humidity, ts is solution's temperature, cs is solution's concentration.Experiment manifests, when entrance air's temperature is above 33 癈, is above 70%, solution's temperature is between 25~34 and solution's concentration is between 40 ~ 46%, dehumidification effect will be best.