The sun, a source of light and warmth, is every grower’s best friend. But when radiation is too high, air and crop temperatures rise to extreme levels – so it’s vital to control how much light is entering your greenhouse.
How to reduce radiation – and the temperature
Movable Svensson® screens are designed to reduce radiation, resulting in considerably lower crop and air temperatures. What’s special is that our screens don’t absorb radiation, but reflect it upwards. Svensson Harmony screens not only provide shade but also light diffusion, leading to a quicker growth and better quality.
The correct light level
Let the morning light in, provide shade during the hottest part of the day, and then open the screen to let in the late afternoon sun. Remember to close the screen at night to get the right temperature.
The appropriate shade level is based on two factors: what crop you’re growing and the maximum sun radiation at your location. Svensson® screens are available in different shade percentages, from 15% to 85%, which means we’ve got you covered.
Not too moist, not too dry
There will be times when you need to increase humidity in the greenhouse, especially when the crop is going through a dry spell. But don’t worry about splashing out on water – the beauty of our screens is that they counteract condensation, dew formation and fungal diseases on the crop.
The underside of the screen absorbs the heat coming from below, preventing condensation and dew formation. At the same time, the leaf temperature is increased through a so-called reduced radiation exchange between leaf and ceiling. Naturally, the design of the screen is also key in this context, allowing water vapor to easily pass through. Our open screens provide a different type of humidity control. The design allows warm, humid greenhouse air to pass through the openings in the screen. Once this air reaches the cold greenhouse glass roof, condensation takes place and consequently humidity level lowers. The dew formed on the glass runs down along the sides and diverts through drainage, while any drops that fall from the roof are caught and gradually dried out by the screen.
How to cool down your heating costs
It’s one of the smallest investments in a greenhouse. And yet, the right climate screen not only has the biggest impact on the quantity and quality of your crop, but also your bottom line. In fact, with energy bills on the rise, it’s reassuring to know that our screens can help you cut back dramatically on heating expenses. Our screens use films and foils, which block outgoing radiation. Basically, this means the aluminium laminate strips take up heat without giving it away. So when closed at night, the screens trap the heat. The result? A 43% to 75% cost reduction compared to a greenhouse without a screen. And remember, the more aluminium the higher the savings.
Keeping the temperature up – or down
In unheated greenhouses, our screens trap as much heat as in heated greenhouses, which means a nighttime temperature that’s 3 to 5°C higher. This stimulates plant growth and protects against frost.
We know our screens are helpful in keeping the temperature up. The opposite is also true. A pad and fan cooling system will, in addition to creating a better growing climate, save you precious energy. Here’s how it works: As the screen lowers the heat input from outside to inside, the system has to run for fewer hours to achieve the same drop in temperature.