Thermal Screens

Thermal Screens for Greenhouses

thermal ScreensThe thermal screens help to create the ideal climatic conditions for the growing of the plants inside the greenhouses reduce energy costs thanks to the thermal power .

Specifications of thermal screens

All the thermal screens for greenhouses supplied by Europrogress, have a common base structure, formed by 4 mm wide strips, held together by a texture of polyester wires.
The strips can be completely transparent to the light or an aluminum coating reflecting the light and the heat.
They are held together in order to obtain a particular shading effect.

Coloured thermal screens are used In the garden centers according to the demand.
The thermal screens are, doubtless one of the most effective methods to save on the strong energy costs required by nursery.

The energy saving essential factors through thermal screens inside the greenhouses, are :

  • the screen thermal power;
  • its air permeability.

The combination of polyester and aluminum, materials, which are used for Europrogress thermal screens, reduces the heat losses remarkably..
The polyester has a high absorbing power of the infrared radiations compared with polyethylene.
In addition, thanks to a special aluminum layer, the thermal screens are an effective barrier for long wave IR radiation and reduce the heat losses even more.

Air permeability in thermal screens

The Europrogress thermal screens are realized in such a way to minimize air permeability without resulting in condensation development. Therefore, weaving plays an important role.
Our efforts to reduce the losses of radiant and convective heating have led to the realization of an energy saving product.

This energy saving is only possible after a precise calculation and a proper installation. Obviously, these data change according to the project and the external climate, to the greenhouse structure and its general conditions.

 

Humidity and Condensation Control

In addition to the energy saving and regulation of light transmission, the thermal screens are also used for the humidity control, especially during the productive cycle, when plant transpiration is insufficient to generate ideal humidity conditions.
In these cases, the greenhouse humidity is increased by closing the thermal cover.

Functioning of thermal screens

The installation consisting in two structures, a fixed one and a mobile one, will allow the adjustment of the thermal screens in any wanted position.
The movements realized by the rack coupling or nylon wires and motoreducers, will be crosswide from roof pitch to roof pitch.
The system will control, through a series of tubes and steel translating profiles, the movement of a series of film sections equivalent to the centre to centre distance..
Each of them will be fixed by a side over its own truss in order to create a fixed frame or overlapping matching area of the thermal screens such to minimize dispersion when the cover sheet is in insulating position.
Suitable pickers and conveyors ensure that the frame be not overleapt at the recollection stage. During opening and closing, a set of guidewires will ensure that the sliding be carried out in the said position.
The delimitation of the cover sliding will be fixed by relative electro-mechanical ends of stroke, controlled by the electric panel provided with control unit, which can be assisted by a computer and data registration.

Light and temperature installation time automations

Exactly under the roof of the greenhouse, temperature can reach very high values, if the installation is not provided with roof ventilation or if the greenhouse is completely closed to sterilize the growing surface. Temperature can be so high to corrupt the elastic polymers.
Consequently, we have chosen materials able to resist to thermal oxidation up to 130° C.
No condensation accumulates on the thermal screens. Therefore, there is no filth and weed growing. Since they are made of extremely light and flexible material, the thermal screens, once they are closed, they take up very little room, to let the light pass nearly completely.
Also external shading installations are available. They can be placed under the structure.