water as key element for sustainable greenhouses
2 content About TNO SIOM approach for sustainable greenhouse design Aquatop greenhouse Flowdeck greenhouse Opportunity for Spanish situation
3 About TNO Dutch R&D organisation, 2800 employees, mostly scientists Mission: creating a better world by helping (SME) companies with innovation Added value: TNO makes (technological) knowledge applicable for companies Structural design Energy and CO2 Water treatment Smart Industry
4 About TNO (2)
5 System Integration an Optimization Model (SIOM) TNO develops structural greenhouse design tool CASTA/Greenhouse since 1990,present day 50 users, World wide demand for high tech greenhouses is increasing Greenhouse concept has to be optimized for local circumstances Together with supplying industry TNO developed a decision support system SIOM to help greenhouse builders to design the optimal solution End 2014 first beta version shipped to key users
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7 Aquatop greenhouse Thin water film on top of greenhouse used for Greenhouse cooling in summer Less energy losses in winter Optimize light transmittance of greenhouse by adding additives like chalk or iron sulphate Can be used on regular greenhouse or on flat roofed greenhouses Technical system: Buffer tank Piping system in greenhouse ridge Seasonal heat/cold storage in soil Optional: heat pump / flat roof
8 Aquatop greenhouse (2) Proof of principle tests at TNO No uptake of this technology because of: Aquatop combines not well with airing windows Risk of water leakage and pollution In Dutch situation limited experience finding advantages for crop
9 Flowdeck greenhouse Similar to aquatop, but water now in closed system using water filled double wall polycarbonate sheets Developed as net energy producing greenhouse in the Netherlands Concept developed by Maurice kassenbouw and Climeco Tests performed at experimental greenhouse Wageningen University, problems with water leakage of polycarbonate sheets New improved sealing developed, but not tested at Wageningen
10 Flowdeck greenhouse (2) Advantages Additional light transmission Better growing conditions (radiation cooling / heating) Closed system, able to use additives Disadvantages Investment costs in relation to energy saving Product development needed wrt polycarbonate sheets
11 Opportunity Spanish situation Flowdeck can be used to realize sustainable greenhouses in Spanish highland area. First analysis using SIOM results in: Daytime: Condensation of humidity to cold flowdeck Better growing climate (active cooling) Good light transmittance, can be diffused Nighttime: Heating using flowdeck, preventing condensation in crop (disease) Regenerating cold buffer tank
12 Opportunity Spanish situation (2) TNO is looking for Spanish partners to develop this concept Current consortium: Maurice Kassenbouw (greenhouse builder) Climeco (climate advisor) TNO (product development, system design) Local end user, research institute and supplier needed Possibility to use H2020 SME Instrument Who wants to Join??