This sensor is a cosine value that we turn into an angle value with the built-in function Then we will use the built-in function to convert from radians to degrees. EnergyPlus has a report variable called “Surface Ext Solar Beam Cosine Of Incidence Angle,” for which we will use a sensor in our EnergyManagementSystem:Sensor input object. When the direct solar incidence angle is less than 45 degrees, we want to draw the blind. We assume that a model for the direct sun control is based on incidence angle, where the angle is defined as zero for normal incidence relative to the plane of the window. Leave the blind open whenever the first two constraints have not triggered. This file has an interior blind that can be either “on” or “off.” The control scheme has three parts:ĭeploy the blind whenever too much direct sun would enter the zone and cause discomfort for the occupants.ĭeploy the blind whenever there is a significant cooling load. We will take the example file PurchAirWindowBlind.idf and use EMS to add a new control scheme. We need to ask, Can we use the EMS to override the shading controls? EMS Design Discussion Window Shade Control Problem Statement ĮnergyPlus offers a wide range of control options in the WindowShadingControl object, but it is easy to imagine custom schemes for controlling shades or blinds that are not available.
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