The GROUND-MED Project - Advanced GROUND source heat pump systems for heating and cooling in MEDiterranean climate

1. The GROUND-MED Project - Advanced
GROUND source heat pump systems for heating
and cooling in MEDiterranean climate
C. Karytsas and D. Mendrinos
Centre for Renewable Energy Sources and Saving
5 December 2014

2. Project summary
• Technology development,
demonstration & monitoring of a new
generation of ground source heat
pump systems for heating & cooling,
with the objective to maximize energy
efficiency (measured annual SPF >5,0)
• 6-year project: 2009-2014
• Co-financed by FP7
• Budget 7,250,000 €
• EU support 4,300,000 €
• http://www.groundmed.eu/
• The technology is demonstrated at
8 buildings in South Europe:

3. Heat pumps – 3 manufacturers CIAT/OSCHNER/HIREF
• Tandem compressors: 4 prototypes
• Inverter compressor: 1 prototype
• Single on-off compressor: 3 prototypes
• External reversion of cooling/heating mode
• Heat rejection at the sanitary water loop
Cold storage
• Phase change material at 8°C
• Ice-cubes with additives
Energy efficient technologies
developed or tested (1)

4. Fan coil units (FCU)
• Low temperature heating: 35°C
• Light weight impeller
• Permanent magnet brushless motor
Air handling unit (AHU)
• Utilizing condensing heat for dehumidification
Indoor heating/cooling system
• Wall heating with wall embedded pipes
Energy efficient technologies
developed or tested (2)

5. Water loop pumps
• Smart, variable speed, energy class Α
Borehole heat exchangers
• Oversized for enhanced performance
• Water without antifreeze as heat transfer fluid
• Grouting with fine gravel or coarse sand in the water table and
bentonite above
• Free cooling provision directly from the earth
Energy efficient technologies
developed or tested (3)

6. Operation control for improved efficiency
• Peak heating with max 40°C water supply to the FCU
• Peak cooling with min 15°C water supply to the FCU
• Temperature compensation depending on thermal load
• Synchronizing compressors with external pump and where feasible
with internal pump(s) and air handling unit
• Frequency control of inverter driven compressor, pumps and fans
based on experimentally derived functions
Energy efficient technologies
developed or tested (4)

7. Project objectives based on SPF
1. Electricity consumption at the compressors
2. + electricity consumption at the external pump
3. + electricity consumption at the internal pumps
4. + electricity consumption at the fans (FCU & AHU)
Electrical energy consumed in the same period
______________________________________SPF =
Useful energy delivered in a given time period
Electrical power used
___________________COP =
Useful instant power
Use of 4 COP, SPF values

8. Monitoring system
Measuring equipment
• Thermal energy meters Brunata or Landis & Gyr
• Electrical energy analyzers Carlo Gavazzi
Data logging
• Collecting data measurements in local PC
• Measurements taken every 15 sec, averaged every minute and stored in a
local .txt file
• Data transmission to the central project server through ftp every 10 min
– Hewlett Packard DL120 G7 Rack Data Server
• Available for download through the world wide web as .csv files
– Detailed measurements in daily or user defined time frame files
– Summary of daily average values for user defined periods

9. SPF levels: heating

10. SPF levels: cooling

11. Coimbra Regional Authority building
Thermal needs:
 34 kW heating
 48 kW cooling
BHE: 7 x 125m,
• Double-U
16°C in winter
20°C in summer

12. Technology demonstrated
Heat Pump
• CIAT prototype with
tandem compressors
FAN COIL UNITS
• CIAT prototypes
• Low electricity
consumption
• Low temperature
heating

13. Roof fan coil units for heating & cooling

14. System Flow Chart

15. Seasonal performance factors
16.6

16. Heating season
19 November 2013 - 21 April 2014
Heat delivered: 31.43 MWhth

17. Seasonal temperature levels, C

18. COP levels

19. Free cooling
9-22 May 2014
Cooling delivered: 0.56 MWhth

20. Space temperature levels, C

21. COP levels

22. Active cooling
27 June – 5 October 2014
Cooling delivered: 10.88 MWhth

23. Seasonal temperature levels, C

24. Daily temperature levels, C

25. COP levels

26. “The Kimolos Geothermal
Desalination Project”
Dr. C. Karytsas and J. Choropanitis
5 December 2014
Athens

27. The area under investigation and its position within the Active Aegean
sea volcanic Arc

28. Multi Stage Distillation - MED

29. Technical specifications of the Prassa-1 and Prassa-2
boreholes

30. Pumping Tests at Borehole Prassa-1

31. Map of the Desalination Unit at Prassa Kimolos

32. The Kimolos Geothermal Desalination unit

33. The Desalination Unit at Prassa Kimolos

34. The Desalination Unit at Prassa Kimolos

35. Well head and Geothermal pump at Prassa 1

36. The Geothermal water pump inverter

37. Conclusions

38. Thank you for your attention