Greenhouse Glazing For Improved Efficiency
by Michael Kovalycsik, National Sales & Marketing Director, Delta T Solutions
With winter fast approaching, you want to make sure your heating system is up to par, but it’s also a good time to think about greenhouse glazings. The right glazing can help ensure the heat you’re paying for is actually staying inside the greenhouse and reaching your plants.
CHOOSING THE RIGHT MATERIAL
Plastic films are most commonly used for commercial greenhouse glazing, according to the National Greenhouse Manufacturers Association (NGMA), and that includes polycarbonate, ethylene vinyl acetate, polyethylene and acrylic films, among others.
Acrylic is the most weatherable, and it also has the highest light transmission of the clear multi-wall panels, allowing for greater energy efficiency. In addition, it’s shatter resistant and not affected by UV rays.
For greater durability, impact modified acrylic is an option to consider. The clear, multi-wall panels allow for 85% light transmission and improved energy efficiency. Like regular acrylic, impact modified acrylic is not affected by UV rays, but it has 10 times the impact strength of acrylic, making it a good choice in areas affected by hail.
Polycarbonate offers the highest impact strength and good long-term performance, according to the NGMA and, of all the plastic glazing materials, it’s the most fire resistant. It is available in single pane corrugated panels, which transmit about 90% light, and multi-wall panels, which transmit about 80% light.
The most affordable glazing available is polyethylene film. These films are flexible and often include UV absorbers (chemical compounds that can selectively absorb UV radiation to reduce damage from UV light), allowing for multi-year use. High-density polyethylene film is stiffer and stronger, while low-density polyethylene film is more flexible.
THE LATEST FILM TECHNOLOGY
For more information on greenhouse glazing, including frequently asked questions, click here for a fact sheet from NGMA. Additional information is available in a fact sheet from The University of Arizona Department of Agriculture & Biosystems Engineering by clicking here.
Delta T Solutions has designed and manufactured customized heating solutions for greenhouse growers using hydronic (hot water radiant) heat for 30 years. To learn more about cost-effective in-ground bench and perimeter heating systems; high-efficiency boiler systems; and other systems that improve crop health, contact Delta T at 800-552-5058 or email firstname.lastname@example.org.
27711 Diaz Rd, Suite B, Temecula, CA 92590 • 800.552.5058 • 760.682.0428 (fax) • www.deltatsolutions.com