In smaller sized greenhouses, a manual system opened and closed by hand could possibly be installed. These work simplest when the screen material is backed by a monitor system.
Start time – when each morning will the display system start operation
Stop time – when in the afternoon will the display screen system stop operation
Light level – in what light intensity will the screen end up being activated either to open up or close
Maximum/minimum temperature – what are the limits of temperature desired
Maximum/minimum humidity – What are the limitations of humidity desired
Gap positions – this models the percent open up or close position under different conditions such as in early stages a winter morning to lessen thermal shock or during the summer to supply better shading. The gap techniques and speed of movement can be controlled in some systems.
Time delay – under changeable climate this avoids frequent rack drive for greenhouse china starting and closing
Wind speed – To lessen temperature loss, the screen could be closed early below high wind speed conditions
Snow detection – this can open the display and turn on the heat when it begins to snow.
The standard system uses nylon monofilament or stainless cables to aid the screen materials. The screen material can possibly rest on top of the network of cables or become suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that moves the industry leading of the screen materials. Control can be either with a manual switch or electronic controller.
Based on the over, the grower must enter the next parameters into the controller:
A weather station is required to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.