The solar greenhouse is a typical greenhouse type in northern China.It provides a favorable environment for the growth of various plants and extends cultivation periods for almost a whole year to achieve a high yield....The solar greenhouse is a typical greenhouse type in northern China.It provides a favorable environment for the growth of various plants and extends cultivation periods for almost a whole year to achieve a high yield.However,indoor environmental control is primarily based on growers'experience,and the objective test data required for the complex climate control and management of greenhouses are lacking.The present study used three greenhouses in northwest China as research objects:one greenhouse with mature plants(GH-M),one greenhouse with young plants(GH-Y)and one greenhouse without plants(GH-E).Field tests were performed to investigate microclimate characteristics,such as indoor air temperature,relative humidity,and solar radiation under natural ventilation.The results showed that the maximum temperature difference reached approximately 8.2℃in the vertical direction,and semiempirical equations for the normalized temperature distribution were obtained.The soil temperature remained constant at a certain depth(0.4 m).The distribution of the relative humidity and solar radiation was analyzed.The current study is helpful for growers to develop better greenhouse climate control strategies for management practices.展开更多
In practical engineering,inclined building walls are often presented due to their functional and aesthetic needs.A reasonable air distribution design is essential for creating a satisfactory indoor environment in such...In practical engineering,inclined building walls are often presented due to their functional and aesthetic needs.A reasonable air distribution design is essential for creating a satisfactory indoor environment in such buildings.In the present study,inclined walls with a variable inclination angle β were used as the research object to explore a novel air supply mode.Visualization experiments and numerical simulations were conducted to investigate the induced airflow,such as the airflow pattern,the airflow characteristics(maximum jet velocity decay and jet spreading rate)and the ventilation effect(vertical air temperature difference,draft rate,air diffusion performance index).The results show that the"air lake"phenomena occurred over the floor,which resembles the displacement ventilation to some extent.The proposed air supply mode has a good ventilation effect and could be applied to building spaces with inclined walls.The current study can be used as a reference for ventilation design in buildings with inclined walls.展开更多
基金This paper was supported by the National Natural Science Foundation of China(No.50778145,No.51478377).
文摘The solar greenhouse is a typical greenhouse type in northern China.It provides a favorable environment for the growth of various plants and extends cultivation periods for almost a whole year to achieve a high yield.However,indoor environmental control is primarily based on growers'experience,and the objective test data required for the complex climate control and management of greenhouses are lacking.The present study used three greenhouses in northwest China as research objects:one greenhouse with mature plants(GH-M),one greenhouse with young plants(GH-Y)and one greenhouse without plants(GH-E).Field tests were performed to investigate microclimate characteristics,such as indoor air temperature,relative humidity,and solar radiation under natural ventilation.The results showed that the maximum temperature difference reached approximately 8.2℃in the vertical direction,and semiempirical equations for the normalized temperature distribution were obtained.The soil temperature remained constant at a certain depth(0.4 m).The distribution of the relative humidity and solar radiation was analyzed.The current study is helpful for growers to develop better greenhouse climate control strategies for management practices.
基金supported by the National Natural Science Foundation of China(No.50778145,No.51478377).
文摘In practical engineering,inclined building walls are often presented due to their functional and aesthetic needs.A reasonable air distribution design is essential for creating a satisfactory indoor environment in such buildings.In the present study,inclined walls with a variable inclination angle β were used as the research object to explore a novel air supply mode.Visualization experiments and numerical simulations were conducted to investigate the induced airflow,such as the airflow pattern,the airflow characteristics(maximum jet velocity decay and jet spreading rate)and the ventilation effect(vertical air temperature difference,draft rate,air diffusion performance index).The results show that the"air lake"phenomena occurred over the floor,which resembles the displacement ventilation to some extent.The proposed air supply mode has a good ventilation effect and could be applied to building spaces with inclined walls.The current study can be used as a reference for ventilation design in buildings with inclined walls.
