Uae watergy 09_15

1. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Dr.-Ing. Martin Buchholz TU-Berlin, Building Technology and Design
CEO Watergy GmbH, Berlin
New Generation Greenhouse Systems -
The Al Dhaid Prototype and Beyond

2. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

3. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Watergy, a closed greenhouse with internal gravity driven air circulation

4. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

5. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

6. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

7. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Big success…
+ High water recovery (85%), total water need 0,5 l/m²
+ Increased yield by CO2 accumulation (1200 ppm CO2)
+ Enclosure keeps insects out (no pesticides´)
…with remaining constraints
- High costs for heat exchanger, tower construction
- Abundancy to (cold) night time temperatures
- Limitation according to high day time temperatures
- Limitied performance of air de-humidification, results to low
evaporation rates

8. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Exotherm Exotherm
Endotherm Endotherm

9. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

10. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

11. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

12. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

13. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

14. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Methods for improved temperature differences between
hot/huimid air and available sources of cool
 Heat pumps ???
 Deep ocean water ???
 Evaporative cooling
 Passive cooling, Storing cooler temperatures
from night to day !!! Rejecting peak heat through night
 Evaporative cooling + air desiccation
 Cultivation of thermophile organisms, breeding
towards heat acceptance, algae
 CO2 enrichment
 Temperature difference between air layers

15. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Methods of heat transfer between hot/humid
air and available sources of cool
 Air to air heat exchangers, use of greenhouse cover
 Increase of Surface
 Increase of heat conductivity
 Air to liquid heat exchangers
 Direct contact air to water heat exchangers
 Direct contact air to liquid desiccant heat exchangers

16. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Methods of storing heat and cool between
day and night
 Water
 Soil
 Gravel, Sand + Water
 Substrate + Soil
 Liquid desiccants
 PCM
 Solar pond

17. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Transport of air and storage medium
Air Ventilation:
Buoyancy driven
Wind driven (open greenhouse)
Pumping
Corrosion problem (moving parts of pumps)
Fluodyne pumps
Moving absorbers

18. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Open Greenhouses
Fan and Pad with condenser
Fan and Pad with evaporator, external evaporator
and condenser
Fan and Pad with triple evaporator and condenser
Fan and Pad with 2 internal humidifiers and condenser
Fan and Pad with de-humidifier, humidifier and condenser
Slope greenhouse
Integration of different climatic zones

19. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Closed Greenhouses
Fan and cooling coil
Decentralized cooler
Day/night storage integration
Additional humidifier integration
Desiccant greenhouse
Zoning of greenhouse

20. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

21. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

22. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Water Recycling Applications

23. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Water Recycling Applications

24. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Condensed Water
Brackish water
Sea water
( > 90%)
Applications including desalination

25. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Condensed water
Sea water
( > 90%)
Applications including desalination

26. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin
Elimination of calcium minerals
Concentration of the brine
Na Cl
Mg Cl
Ka Cl
Applications including desalination

27. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

28. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

29. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

30. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

31. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

32. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin

33. Dr. - Ing. Martin Buchholz, Technische Universität Berlin, Watergy GmbH Berlin