Film and glass
2SaveEnergy is a greenhouse roof consisting of an outer layer of bright glass covered with a double anti-reflection coating and an under layer of extremely durable, diffuseF-CLEAN film. In between there is a cavity that can be ventilated. In 2015 and 2016 a cultivation trial of tomatoes and cucumbers has proven that this design creates a higher production with 50% less energy consumption.
Lighter and more profitable
"This combination isolates almost as efficient as multiple coated double glass, but is much lighter and less expensive in realisation. Moreover, it lets as much light pass through as a standard roof of single glass which cannot disperse sunlight", according to the consortium. The consortium consists of VDH Plastic Greenhouses, Van der Valk Horti Systems, BOAL Systems, AGC Chemicals Europe. They are developing the roof in collaboration with WUR Glastuinbouw.
Transmission.
Calculations done by WUR Glastuinbouw show that it is possible to achieve hemispherical transmission of 80.7%and vertical transmission of more than 90.6% for a glass/film combination, which is comparable witha standard covering", "Tests have confirmed that the theoretical values can also easily be achieved in practice"
Tomatoes with 10m3/m2
Meanwhile the limits of growing are further expanded with the new greenhouse covering at WUR Glastuinbouw. This year it is attempted to achieve a energy end-use of 10m3/m2 for the cultivation of Cappricia (65% saving) in the demonstration greenhouse. For this purpose a number of extra saving measures have been added to the investigation 'A strong crop with little gas'. These include the replacement of two bright screens by two aluminated screens for nightly use only.
In addition a new bright screen is placed at the bottom of the lattice-work for use during the day. Latent heat is also recovered by using a heat pump and the front will be isolated. Cultivation is adapted using the strategy of more screens, less heat venting and increasing use of solar heat.
2SaveEnergy
2SaveEnergy® has been developed by a consortium of expert suppliers incollaboration with WUR Glastuinbouw. The partners involved are: VDH Plastic Greenhouses, Van der Valk Horti Systems, BOAL Systems, AGC Chemicals Europe Ltd. The Project has been realised with support, coming from the program ´Greenhouse as Energy Source´, the innovation and action program by LTO Glaskracht Nederland and the Ministry of Economic Affairs.
2SaveEnergy
2SaveEnergy® has been developed by a consortium of expert suppliers incollaboration with WUR Glastuinbouw. The partners involved are: VDH Plastic Greenhouses, Van der Valk Horti Systems, BOAL Systems, AGC Chemicals Europe Ltd. The Project has been realised with support, coming from the program ´Greenhouse as Energy Source´, the innovation and action program by LTO Glaskracht Nederland and the Ministry of Economic Affairs.
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