In smaller greenhouses, a manual system opened and rack drive for greenhouse china closed by hand could possibly be installed. These work easiest when the screen material is supported by a monitor system.
Start time – when in the morning will the display system start operation
Stop period – when in the afternoon will the display screen system stop operation
Light level – at what light intensity will the screen be activated either to open or close
Maximum/minimum temperature – what exactly are the limitations of temperature desired
Maximum/minimum humidity – What exactly are the limits of humidity desired
Gap positions – this sets the percent open or close placement under different conditions such as early on a winter morning to reduce thermal shock or during the summer to provide better shading. The gap guidelines and speed of motion can be controlled in some systems.
Time delay – below changeable climate this avoids frequent opening and closing
Wind speed – To lessen warmth loss, the screen could be closed early under high wind speed conditions
Snow detection – this may open the screen and turn on the heat when it starts to snow.
The typical system uses nylon monofilament or stainless steel cables to aid the screen material. The screen material can possibly rest along with the network of cables or become suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that movements the leading edge of the screen material. Control is definitely either with a manual change or electronic controller.
Based on the above, the grower must enter the next parameters into the controller:
A climate station is required to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.