A quasi-steady state model for predicting the heating requirements of conventional greenhouses in cold regions
作者机构：Division of Environmental EngineeringUniversity of SaskatchewanCanada Department of Mechanical EngineeringUniversity of SaskatchewanCanada Department of Plant SciencesUniversity of SaskatchewanCanada
出 版 物：《Information Processing in Agriculture》 (农业信息处理（英文）)
年 卷 期：2018年第5卷第1期
页 面：33-46页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：University of Saskatchewan, U of S College of Graduate Studies, Kuwait University
主 题：Heating model Solar radiation Supplemental lighting Evapotranspiration
摘 要：A time-dependent,quasi-steady state thermal model(GREENHEAT)based on the lumped estimation of heat transfer parameters of greenhouses has been developed to predict the hourly heating requirements of conventional *** model was designed to predict the hourly heating requirements based on the input of greenhouse indoor environmental control parameters,physical and thermal properties of crops and construction materials,and hourly weather data including temperature,relative humidity,wind speed,and cloud *** model includes all of the heat transfer parameters in greenhouses including the heat loss for plant evapotranspiration,and the heat gain from environmental control *** show that the predicted solar radiation data from the solar radiation sub-model are a reasonable fit with the data from the National Solar Radiation Database(NSRDB).Thermal analysis indicates environmental control systems could reduce 13–56%of the total heating requirements over the course of a year in the study *** the winter season,the highest amount of greenhouse heat is lost due to conduction and convection,and the heat used for evapotranspiration is dominant in the ***,the model was validated with actual heating data collected from a commercial greenhouse located in Saskatoon,and the results show that the model satisfactorily predicts the greenhouse heating requirements.
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