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Energy screen's quality

 

The most important parameters that define quality of energy screens are:

 

STABILIZATION

 

This parameter defines quantity and quality of PE stabilizing agents against UV radiation degradation.
Our energy screens are stabilized in a way that ensures 12 months warranty. 

 

LIGHT TRANSMISSION

It defines total amount of transmitted light in the whole range. 
Our energy screens have this parameter equal to 89%. To compare - glass has it equal to 91-92%

  

LIGHT DISPERSION

 

If we create a slightly milky white material in a controlled and planned manner, in a way that will not block transmission of light too much, the total amount of light available for a plant will increase.
Light will reach the plant from different angles, will light the whole plant up more evenly, the intensity will be lower on upper leaves while bottom ones, which are usually in shade, will receive more energy.

Our energy screens disperse around 25% of light reaching the facility.

 

 

ANTI-CONDENSING EFFECT

 

Condensation in the facility is the effect of outdropping of steam on colder surface of glass, film or mulching film.

 

Condensation can lead to 3 issues:

1. water dripping on plants soaks them, making damage and increasing susceptibility to many diseases
2. droplets hanging on film can cause focus of light and local damage to plants
3. droplets hanging on film can cause that light, which has already passed through film and could be used totally by a plant, is partially reflected back.

It is estimated that light loss for cultivation can reach in this case even 15%.

Anti-condensing layer changes the condensation characteristics: condensed water vapour doesn't hang from film in a form of droplets but creates a thin layer that flows towards sides of facility, where it is not such a big issue any more.

 


THERMAL EFFECT

 

There are three ways the heat is being lost:
1. by interface of warm air from the facility's inside area and cool air from the outside by means of greenhouse's glass or tunnel,
2. by intentional and non intentional (facilities' leaks) degassing
3. by pumping out the heat with infrared

 

EVA additive, that is responsible for thermal effect, reduces heat losses caused by radiation.

Advantages of film with thermal effect can be observed especially in the morning.

It is estimated that temperature difference oscillates - depending on object's size - around 1-2°C.
It gives even a few percent of savings on fuel.

 

 

 

NOTE

 

There are no parameters of energy screen that depend on its thickness.

On the contrary, energy screen should be as light and thin as possible, in order to allow easy mounting, removal and the best light conditions possible.

 

This can bring us to the conclusion that energy screen's quality is determined by: technology that allows prodicing films of small thickness, quality of raw materials and additives.
The way these elements are being used during production, depends mainly on technical possibilities and experience of manufacturer.