| With the rapid development of the greenhouse, modern greenhouse and modernfacilities horticulture has gradually been specialized, intensive and large-scaled.Therefore, how to reduce energy consuming and improve efficiency maximally is themain problem by the greenhouse plantation.The essay provides theoretical guidance for optimization design of thegreenhouse based on Heating Technology, Heat Transfer and Thermodynamics. Itintroduces an overview of the greenhouse heating system, analyzes the interactionsamong the various indoor parameters and the impact factor, creates mathematicalmodeling, studies the effects of each factor on greenhouse microclimatecomprehensively by consulting experiments.It shows the latest status of national and international research of greenhouseheating technology and microclimate. And it elaborates the indoor and outdoor designtemperature, heat load of the system, hourly heat load, heating method, systemcomponents etc. by referring to heating design theory of general constructions andconsidering of the feature and plantation requirement of the green house.The research of greenhouse heating system is inseparable from the study ofgreenhouse microclimate. It analyzes the heat balance of greenhouse’s overlay, airlayer, crop canopy and earth’s surface based on existing theories and modeling. Thenan equation was created in order to introduce Solar Energy and radiation heat transferinto the study of greenhouse radiation heat transfer. Indoor energy flow and relevantfactors were described individually.Luminousness and thermal insulation are the two main parameters of greenhouseoverall performance. Dynamic models were created to provide further theoreticalbasis for lighting and heating designs. The model has continuously simulate ofgreenhouse microclimate, quantitatively research on the PC transmission property andthe heat load at night, analyze the results of heat load in different interior and exteriordesign conditions and combine with experimental data for comparison. |
