Thermal Screen Offcuts

Description

A greenhouses basic principle is to allow light/heat in through a clear cover that absorbs the contents. Light & heat change from short wave radiation to long wave, reflected back off the inside of the clear cladding.

Thermal screens alter this effect and:

• Shade the greenhouse contents and make growing possible.
• Reflect a large proportion of the incoming light/heat before it becomes long wave radiation. Closed at night will contain heat and reduce condensation.
• Closed at night will greatly reduce heating load in winter.
• Closed during the day will reduce cooling loads and maintain good growing conditions.
• Blackout screens block the sun.

Thermal screen types:

There are vast number of screens available from various manufacturers, divided into 6 main categories:

• Internal open weave shade screens of various shade values that allow the passage of ventilation air but have the disadvantage of a lower energy conservation.
• Internal closed screens that do not allow air passage but have much higher energy conservation.
• Energy screens that are basically clear and reduce the heating and cooling volume of the greenhouse and conserve energy.
• Black out screens block natural light helping to maintain artificial environments.
• External open screens of various shade factors that will sit on top of the greenhouse glass or plastic – for fixed, rolling or concertina shade covers.
• External closed screens – for specialised shaded rain cover.

Thermal screen system types:

• External tarpaulin type covers for seasonal shading and heat reflection.
• Internal or external manual systems used seasonally is moved in a matter of minutes.
• Internal or external motorised systems that can be opened and closed automatically according to light level, temperature or time.
• Because there is so much information on thermal screens we would suggest that we can design your system and provide drawings and instructions, as part of an order for materials.