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Two types of greenhouse glass

  • horticultural float glass
  • diffuse glass.

The typical glass that is used for glass greenhouses is the horticultural float glass. It is a transparent glass with a high light admittance to ensure sufficient light in the greenhouse.

The iron contents of greenhouse glass also have impact on the overall light translucency. The so-called “low-iron” glass is more transparent than regular glass. Applying AR-coatings are permanent anti-reflection coatings that reduce the reflection levels of sunlight on the glass, which results in more light in the greenhouse.

In many cases the greenhouse glass is tempered for safety reasons. This makes the glass 4 to 7 times stronger than the default form of float glass.

The size of the glass panes with which the greenhouse is glazed are dependent of the aluminum system, the trellis-span and the post-distance.


  • Pad & Fan Cooling
  • High Pressure Fogging

The Pad & Fan cooling method is a widely applicable cooling system due to it’s simplicity. As the name indicates, it uses a combination of wet-pads and ventilators. A set of large fans blow air out of the greenhouse, causing a suction-draught through the greenhouse. On the opposite sides of the fans, pad-walls are installed which are kept wet. The suction-movement caused by the fans, forces hot outside air to be pulled into the greenhouse through the wet pads. Water from the pads evaporates into the hot air, increasing its humidity whilst lowering the temperature.

High Pressure Fogging

Similar to the Pad and Fan system, High Pressure Fogging works on the principal of evaporative cooling. Under a high pressure, water is introduced to a nozzle with a miniscule opening. In essence, water is divided into tiny particles, creating fog. When the temperature and humidity-levels in the greenhouse allow it, these water particles are absorbed into the surrounding air before they hit the leave of the crop. Just like Pad & Fan, the humidity is increased and the greenhouse air is

Pi Sensors

Sensors list

  • DHT22 — Temperature and Humidity.
  • TSL2561 — Lux Sensor (I2C Bus)
  • AtlasPH — Atlas Scientific PH Sensor (I2C Bus)
  • AtlasEC — Atlas Scientific EC Sensor (I2C Bus)
  • YoctoCO2 — Yoctopuce CO2 Sensor
  • WaterlevelSimple — A simple Input for monitoring a waterlevel (GPIO)


You can connect simple relay boards to your raspberry pi and connect them to the GPIO ports. Using this simple technique you can switch on or off any type of actuator, no matter if 5V, 12V or 230V. But please be aware that working with electricity always carries risks, so if you don’t know exactly what you’re doing, you better don’t do it.

We’ve also added support for the Yoctopuce MaxiPowerRelais, which is a lot simpler to setup and doesn’t require soldering. We can definitely recommend Yoctopuce’s products.

This gives you control over lights, water pumps, dosage pumps for PH down, nutrient feeders or fans.

A source/catalog of sensors


Pix4Dmapper Swiss based drone mapping, automatically processes terrestrial and aerial imagery acquired by light-weight UAV or aircraft using its innovative technology based purely on image content. This software converts your images into highly precise, customizable and timely results for a wide range of GIS and CAD applications.

Dutch Commercial Companies

  • Arie Noordam and Ron van der Burg. Both men had vast experience in the greenhouse construction industry




AgTech Data

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US Companies


London centered



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agtech.txt · Last modified: 2019/06/03 04:34 by root
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