a performance case study of energy pile foundation at ... · rosborg gymnasium: performance case...
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A performance case study
of energy pile foundation
at Rosborg Gymnasium (Denmark)
12th REHVA World Congress Clima 2016, Aalborg, May 2016
Maria Alberdi -Pagola, Aalborg University (mapa@civi l .aau.dk)
Rasmus Lund Jensen, Aalborg Univers i ty
Søren Erbs Poulsen, VIA Univers i ty Col lege
The ground below the building is used as a heating/cooling source.
Solar energy
99%
Geothermal flux
1%
Energy piles Description of the site Results & Discussion Conclusions
South extension
4000 m2 area
200 kW heat pump
200 energy piles, heating demand
Fully monitored
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Energy piles Description of the site Results & Discussion Conclusions
House loop
Indoor temp.
Installation scheme & sensor network
Ground loop
Energy piles Description of the site Results & Discussion Conclusions
0 m
Heating & free cooling supply, 345-day period
Heat extraction = 70 MWhTotal heating = 100 MWhMax extraction rate = 50 W/m (1.2h) Average extraction rate = 13 W/m (3400h)
Heat injection = 8.5 MWhMax. injection rate = 50 W/m (0.15h) Average injection rate = 1 W/m (800h)
Energy piles Description of the site Results & Discussion Conclusions
Performance factors: improvement after summer due to adjustments in circulation pumps
Energy piles Description of the site Results & Discussion Conclusions
Hourly performance
Energy piles Description of the site Results & Discussion Conclusions
Ground loop temperatures: return brine temperature does not go below 5.5oC
Energy piles Description of the site Results & Discussion Conclusions
Thanks
?Maria Alberdi-Pagola ([email protected])
Energy piles Description of the site Results & Discussion Conclusions
The heat extraction from the ground can be further increased
The installation is over-sized in terms of thermal performance and capacity
Storage tank too small + heat pump too big Reason for heat pump running cycles
Building and soil interaction aim to more optimised systems
New strategies
- Supply the ventilation by GSHP
- Use more free cooling to balance ground use
- Better adjust circulation pumps