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首页> 外文期刊>Acta Horticulturae >Decision support for greenhouse climate control using a computerised mollier diagram.
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Decision support for greenhouse climate control using a computerised mollier diagram.

机译：使用计算机化的莫利尔图为温室气候控制提供决策支持。

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摘要

At present, there are only a few aids available for estimating the momentary quality of the greenhouse climate, which concerns the set-up of optimal air temperature and humidity conditions. The combined effects of temperature and air humidity can only be illustrated inaccurately from measuring diagrams and, for production processes in commercial greenhouses, no information about the mass and energy fluxes of the plants is available. By using a digitized mollier-h,x-diagram calculations and representations can be carried out to aid air-conditioning technology. With the help of a thermodynamic model and a computer program, the diagram was digitized. The use of the equations for the thermal properties of wet air, make it possible to use the flexible plot of the diagram in the areas of temperature, absolute air humidity and air pressure. A special routine of the program allows the calculation and representation of the air condition point. An additional value can be imported into the database, which can be plotted by a colour scale. In a commercial production greenhouse for tomatoes, measurements were obtained with a phytomonitoring system that selected microclimate and plant data. With the help of leaf chambers and a gas exchange system, transpiration mass flow and net photosynthesis were measured at eight places every five minutes during the whole culture (nine months). Leaf temperature and vapour concentration difference (VCD) were calculated. From net photosynthesis and measured global radiation, light use efficiency (LUE) was calculated. The data were represented monthly in the Mollier diagram. As a result, the sectors of the highest LUE could be shown. In areas with high VCD, low LUE values were obtained, possibly due to closing stomata or photoinhibition. As an indication for stomatal closure low stomatal conductivity was measured at higher VCD.
机译：目前，只有很少的辅助手段可用于估算温室气候的瞬时质量，这涉及最佳空气温度和湿度条件的设置。温度和空气湿度的综合影响只能从测量图中不准确地说明，并且对于商业温室中的生产过程，没有关于植物的质量和能量通量的信息。通过使用数字化的mollier-h，x线图，可以进行计算和表示，以辅助空调技术。借助热力学模型和计算机程序，该图被数字化。通过将方程式用于湿空气的热特性，可以在温度，绝对空气湿度和气压区域中使用图表的灵活图。该程序的特殊例程允许计算和表示空调点。可以将其他值导入数据库，该值可以通过色标进行绘制。在用于西红柿的商业化生产温室中，使用选择了小气候和植物数据的植物监测系统进行了测量。借助叶室和气体交换系统，在整个培养过程（九个月）中，每五分钟在八个位置测量蒸腾质量流量和净光合作用。计算叶片温度和蒸气浓度差（VCD）。根据净光合作用和测得的总辐射，计算光利用效率（LUE）。数据每月在莫里尔图中表示。结果，可以显示最高LUE的扇区。在VCD高的区域，可能由于封闭的气孔或光抑制而导致LUE值较低。作为气孔闭合的指示，在较高的VCD处测得的气孔传导率较低。

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