Greenhouse Management

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Presentation transcript:

Greenhouse Management Greenhouse Glazings Greenhouse Management

Greenhouse Glazings The greenhouse glazing is the “skin” or covering of the greenhouse. There are 4 basic types of glazings: Glass Rigid Plastics Semi-rigid Plastics Plastic Films

Light Transmittance Light transmittance is the most important property of a glazing. No glazing material transmits 100% of the light that strikes it.

An Even-span Greenhouse Light Transmittance Light striking a greenhouse glazing has 3 fates: Some of it will be reflected by the glazing. Some of it will be absorbed by the glazing The rest of it will be transmitted through the glazing. An Even-span Greenhouse

Glass Prior to the 1950’s, all greenhouses were glazed with glass. Longevity: 25+ years. Advantages: Best light transmittance; approximately 90%. Not affected by UV radiation from the sun. Because of this glass is long-lived. Not subject to temperature related expansion and contraction.

Glass Disadvantages: Moderately expensive. Breaks easily. Because of it’s weight it requires more support. The additional framing materials add to the cost of the greenhouse and create shade. Low heat retention.

Glass Additional comments: Available as a thermopane, although most new construction is single pane.

Cross-sectional view of a rigid plastic Rigid Plastics Most of the rigid plastics used on greenhouses today are multi-walled. The 2 most common rigid plastics are acrylic and polycarbonate. 2 layers ribs Cross-sectional view of a rigid plastic

Acrylic

Polycarbonate

Rigid Plastics Longevity: 20 – 30 years. Advantages: Good light transmittance; approximately 80-83%. Do not break easily. Lightweight compared to glass. High heat retention. Uses 50-60% less fuel for heating than a glass greenhouse.

Rigid Plastics Disadvantages: Most expensive. Subject to temperature related expansion and contraction. While polycarbonate glazings are flame resistant, acrylic glazings are flammable.

Semi-rigid Plastics FRP, fiberglass reinforced plastic, consists of glass fibers embedded in acrylics. It is available in flat sheets or corrugated sheets. Corrugated sheets are stronger. Corrugated Sheet

Corrugated FRP

Semi-rigid Plastics Longevity: 10 – 15 years. Advantages: Suitable for even-span and quonset greenhouses. Good light transmittance in the first 3-5 years; approximately 88%. Does not break easily. Moderately expensive. Lightweight compared to glass.

Semi-rigid Plastics Disadvantages: Requires a surface treatment/cleaning every 5 years to increase longevity. Medium heat retention.

Quonset style house glazed with plastic film Plastic Films Most of the plastic films used today are made from polyethylene. Two sheets are used. An inflation motor blows air between the sheets and “inflates” them. Quonset style house glazed with plastic film

Plastic (polyethylene) Film

Inflated Double-Polyethylene Film

Plastic Films Plastic films are slowly permeable to oxygen and carbon dioxide. Not permeable to water. Thickness of the sheets is measured in “mils”; one mil is one thousandth of an inch. Standard sizes are readily available, or custom sizes can be ordered.

Plastic Films Longevity: 3 – 4 years. Advantages: Very lightweight compared to glass. Conforms to trusses and bows of all sizes. Inexpensive and easy to install. Double-poly has high heat retention.

Plastic Films Disadvantages: Damaged by UV radiation and consequently needs to be replaced on a regular basis. Reduced light transmittance, especially through double-poly; approximately 84%.

The End