Job offersmore »
- IPM & Pollination Specialist (ornamentals) - Western Europe
- Sales and Marketing Representative - Canada (British Columbia)
- Werken op een groene productie locatie in Afrika?
- Site Manager - UK
- Avocado Industry Data Analyst - Australia
- Assistant farm manager
- Plant breeder or molecular biologist (Denmark)
- Post-Harvest Senior Manager Required- Kenya
- Growing specialist Helda Beans & Peppers - Africa or Mediterranean area
- Product Development and R&D Engineer (Greenhouse and Equipment) - Canada
Top 5 - yesterday
Top 5 - last week
- "Horticulture production in India has exploded"
- Young entrepreneur serves Iranian niche market with DIY hydroponics
- Soilless technology takes root in blueberry cultivation
- What are the start-up costs of a greenhouse business?
- US(AZ): Civic Farms to break ground on 20,000 sq. ft. vertical farm at Biosphere 2
Top 5 - last month
Exchange ratesmore »
How essential are thermal screens for an energy efficient greenhouse?It is now well proven that retractable thermal screens can save energy without having a detrimental effect on plant growth or quality; and you might even argue that a screen is now also an essential tool for both energy saving and greenhouse environment optimisation.
Several projects have shown the huge advantages of having a screen. So why are some growers still overlooking the technology?
Obviously, if you are growing a low energy crop, or if your greenhouse does not lend itself to having a screen installed, the payback on an installation may make it uneconomic. However, paybacks on most installations are between 18 months and three years.
For example, if you are growing a crop throughout the winter months at greenhouse temperatures of 18 degrees C or more, you can expect to get savings of at least 90 kilowatt-hour per square meter (kWh/m2).
Obviously installation costs depend on the complexity of the site, but they are typically in the range of £50,000 to £90,000/Ha. This means that even with an old greenhouse with a difficult installation procedure the payback should still be no more than three years.
With this level of payback, installing a thermal screen is still more attractive than facing the difficult task of managing the installation and operation of a greenhouse with a temporary polythene screen.
Source: GrowSave / Holland Scherming
Publication date: 4/21/2017
Other news in this sector: