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