На английском языке. Статья опубликована в ж. Agricultural and
Forest Meteorology. – 2002. – V.
112. – P. 1–22.
Abstract
The paper begins with a brief review of earlier work. The 1990s saw limited extensions to the theory, computer modeling and practices relating to light transmission, apart from an interesting, but unproven new design to improve transmission. Studies concentrated on improving the performance of greenhouse elements (e.g. cladding), including methods of measurement. Thermal studies show significant progress. Computer modeling was extended to include the time dimension and finite element techniques were used to improve resolution of detail. As with light transmission, studies intended to improve the quality of greenhouse elements were also carried out. Understanding and modelling the performance of a thermal screen has also been improved, both as such and as an integral part of the greenhouse. Much effort was directed towards understanding ventilation. Analysis has shown that different sources exist (thermal-, wind-induced), and these have been analysed. The existence of inteal circulating air pattes has also been established. The optimisation of carbon dioxide concentrations in greenhouses has now reached the point where the gain to a grower can be readily predicted.
Further computer modeling of light transmission to include the effects of scattering and modelling of skylight to predict leaf irradiance are proposed. Extension of finite element techniques to further improve resolution in thermal studies is recommended. A comprehensive investigation of the physical and engineering aspects of ventilation and inteal air flows is also needed, to support the extended thermal studies of the greenhouse. Finally, a pilot study, anticipating the design of a computer-controlled greenhouse is envisaged.
112. – P. 1–22.
Abstract
The paper begins with a brief review of earlier work. The 1990s saw limited extensions to the theory, computer modeling and practices relating to light transmission, apart from an interesting, but unproven new design to improve transmission. Studies concentrated on improving the performance of greenhouse elements (e.g. cladding), including methods of measurement. Thermal studies show significant progress. Computer modeling was extended to include the time dimension and finite element techniques were used to improve resolution of detail. As with light transmission, studies intended to improve the quality of greenhouse elements were also carried out. Understanding and modelling the performance of a thermal screen has also been improved, both as such and as an integral part of the greenhouse. Much effort was directed towards understanding ventilation. Analysis has shown that different sources exist (thermal-, wind-induced), and these have been analysed. The existence of inteal circulating air pattes has also been established. The optimisation of carbon dioxide concentrations in greenhouses has now reached the point where the gain to a grower can be readily predicted.
Further computer modeling of light transmission to include the effects of scattering and modelling of skylight to predict leaf irradiance are proposed. Extension of finite element techniques to further improve resolution in thermal studies is recommended. A comprehensive investigation of the physical and engineering aspects of ventilation and inteal air flows is also needed, to support the extended thermal studies of the greenhouse. Finally, a pilot study, anticipating the design of a computer-controlled greenhouse is envisaged.