Precast pile heat exchangers in
Denmark: case study and on-going projects
VIA University College, Horsens
Vejle
Fjernvarme
Maria Alberdi-Pagola, Søren Erbs Poulsen & Theis Raaschou Andersen
ECSMGE-2019
DISCUSSION SESSION D3-7 TC307 – SUSTAINABILITY 13:50-15:40
Ground heat exchangers
Horizontal loops Vertical loops Energy piles
High COP
Passive cooling
Seasonal heat storage
Improved efficiency when used for both heating and cooling
The future energy supply in Denmark
DK cooling demand 2016:
9.500 GWh (6,8 GW)
~50% comfort cooling District cooling in DK:
Societal- og consumer economic
benefit of 10 and 13 bio. DKR (1.3 and 1.7 bio. €)
Cooling demand worldwide:
300 til 4.000 TWh from 2000 to 2050.
25% of the increase due to global warming
The Danish Energy Board, 2018 & Køleplan Denmark 2016
Heating Cooling
Ny Rosborg, Vejle
Lokalt produceret energi Energieffektivisering
Forsyningssikkerhed
Rosborg Gymnasiu m
3.000 domestic units,
institutions, super markets and business
”Design and performance of energy pile foundations”, industrial PhD-project, 2015-2018
VIA University College
• Temperature models and experimental validation
• Dimensioning tool
Optimal number of energy piles and positions
Ådalsholm en
Rosborg Gymnasiu m
”Sustainable, building-integrated heating and cooling for future resilient cities”, government funded project, 2017-2019
Vejle District Heating
VIA University College
• Temperature models and experimental validation
• Dimensioning tool
• Geothermal screening for Cold District Heating
• Passive/free cooling
• CDH computational model
Soil thermal conductivity s (W/m/K)
Volumetric heat capacity s (MJ/m3/K)
Room temperatures Cooling power normalized by electricity consumption
Darcy-Weisbach pipe flow model:
;
Pipe heat transport model:
Soil: Pipe fluid:
;
Energy pile heat transport model:
