Announcements

Job offersmore »



Tweeting Growers

Top 5 - yesterday

  • No news has been published yesterday.

Top 5 - last week

Top 5 - last month

Exchange ratesmore »




System can make greenhouse energy self sufficient for 90%:

Solar system uses Fresnel lenses to heat greenhouse

Using a special lens to magnify the light in order to harness the sun's energy, Sika Energy's system has the potential to cover up to 90 percent of a greenhouse's heating needs. The Fresnel lenses, which concentrate energy from the sun into a focal point, heat water inside a pipe to a high temperature. The heated water is then transferred to a reservoir tank that growers can use to heat the greenhouse during the day and throughout the night.



 

“The system can heat water up to 90 degrees Celsius,” said Sika Energy's Cees Kattenberg. That temperature can be achieved because of the type of lenses Sika uses. In early trials, Kattenberg explained, more typical lenses were used, but they were bulky, expensive and couldn't generate enough heat to justify their drawbacks. They turned to Fresnel lenses, which are lighter and generate more power because they concentrate the sun's rays into a single point.



“The lenses we use are basically magnifying glasses,” said Kattenberg. “They burn in a line.” Further boosting the energy captured from the sun, the lenses rotate from East to West, following the path of the sun, and the pipes full of water on which the lenses are mounted rise and fall with the position of the sun in the sky. Kattenberg noted that they continue to run trials with the system, and an upcoming project has given them the opportunity to experiment with new features.

“We're working on a project that will have a bay that's over 100 meters long, and it will have nine lenses,” said Kattenberg. It will be Sika's first commercial project, and it will be installed in a bedding plant nursery. Future trials will include lenses that are twice as large that have the potential to heat the water in the system up to 180 degrees Celsius.


Cees Kattenberg at the 2013 OFA Short Course in Columbus, OH.

Kattenberg touted the cost-efficient nature of the system, noting that the cost to set up the system is a fraction of that of other solar energy systems. The lower investment for a big energy payoff is what makes the system so attractive. “The good thing about the system is that it works anywhere there's sun, even when it's cold out,” said Kattenberg. “As long as the sun shines, we can get energy.”

For more information:
Sika Energy USA
Cees Kattenberg
Dutch American Greenhouse Builders LLC
4653 North County Road 45
Owatonna, MN 55060 USA
dutcham@dutch-am.com
http://www.sika-energy.com/gb/index.html

 

Publication date: 7/26/2013
Author: Boy de Nijs
Copyright: www.hortidaily.com

 


 

Other news in this sector:

1/20/2017 "Ditch your farm’s whiteboard for planning"
1/19/2017 Tomatoes from seed to harvest without daylight
1/19/2017 "LED lighting profitable in strawberry cultivation"
1/17/2017 Lumileds launches Horticulture Lighting Calculator
1/9/2017 Kitchen garden plays music for plants
1/9/2017 The future of agriculture: IoT, big data & smart farming
1/9/2017 US (CA): Berkeley Lab awarded $4.6M for ag tech research
1/5/2017 Unifan now exclusively available at Anima Trading
1/5/2017 AHDB and STC are lighting the way for LEDs
1/4/2017 Semi-closed technique also usable in conventional greenhouses
12/23/2016 Plesssey unveils Hyperion at IPM 2017
12/23/2016 Bosch foresees future with robot farmers
12/23/2016 TTA launches new “Trayscan” app
12/22/2016 Paskal introduces new wireless weighing gutter
12/20/2016 FoodTechHolland the aftermovie
12/20/2016 Bumblebees no longer lost when the lights are on
12/19/2016 Practical testing of far-red light has begun
12/19/2016 Do you have enough light inside your greenhouse or indoor grow?
12/16/2016 Five reasons to use radiant heating
12/16/2016 "LED grow lights can drastically speed up flowering"