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COWI NORTH AMERICA ENERGY
Cooling Copenhagen
JENS O. HANSEN
President/Managing Director
E-mail: jha@cowi.com
www.cowi-na-energy.com
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2012
COWI NORTH AMERICA ENERGY
AGENDA
1. The Copenhagen Cooling plan
2. Project Kongens Nytorv – the first system
3. Project City Hall Square - the new extension
4. The network
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COWI NORTH AMERICA ENERGY
COWI is the world largest full service district energy/CHP consultant
150
DISTRICT
2,000
City of Seattle
Stanford University
DISTRICT
ENERGY
PROJECTS
ENERGY
STAFF
Hartford State of CT
Bridgeport, Nupower
Baltimore Veolia
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2012
40 YEARS OF EXPERIENCE
COWI NORTH AMERICA ENERGY
Copenhagen
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22013
COWI NORTH AMERICA ENERGY
Copenhagen – the capital of district energy
Population:
1.1 mill
District Heating consumers :
0.5 mill
Pipe length – Hot water(trace): 900 miles
Pipe length – Steam (trace):
90 miles
First steam district heating build in 1925
98% connection rate
Decided in 2008 to build a commercial district
cooling system
Transmission
Distribution
- Steam
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Distribution - Water
COWI NORTH AMERICA ENERGY
The feasibility study
› A feasibility study / master plan
investigation several areas of
Copenhagen was completed in 2009
› The study showed several areas
with a sound economic
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COWI NORTH AMERICA ENERGY
Current plan
• Identified 8 obvious DC areas
• Estimated total demand - 150 MW
• Power savings - 60 GWh/yr (-80%)*
• CO2-Reduktion 25.000 tons/yr (-65%)*
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Source: HOFOR
COWI NORTH AMERICA ENERGY
Project Kongens Nytorv – the clients
› Historic downtown of Copenhagen
› Key Anchor Clients:
› Danske Bank (Bank)
› d'Angleterre Hotel
› Magasin (shopping mall)
› Illum (shopping mall)
› Berlingske Tidende (Media company)
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2012
COWI NORTH AMERICA ENERGY
Project Kongens Nytorv – Adelgade Cooling Plant
› Total capacity 15 MW –
extension potential up to 25 MW
› Sea water used for free cooling
and condenser cooling
› Free cooling capacity – 3 MW
› One heat-driven absorption
chiller - 3.2 MW
› Three electric-driven screw
chillers 3.4 MW (two installed)
› One electric VFD-driven Piston
chiller - 1.2 MW
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COWI NORTH AMERICA ENERGY
Project Kongens Nytorv – The Production
› The plant operates in three modes
› Free cooling, sea water
› Steam driven absorption
› Electric chillers
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2012
COWI NORTH AMERICA ENERGY
Adelgade Plant
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COWI NORTH AMERICA ENERGY
Project City Hall Square
› Examples of Clients
› City Hall
› Tivoli
› Confederation of Danish
Industry
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Source: HOFOR
COWI NORTH AMERICA ENERGY
Project City Square - Sea Water Intake
› 300 m2 sea water intake
› Two Ø1500 intake pipes at 7 m
depth
› Two intake reservoirs with selfcleaning 10 mm filtration screens
› Four pump lines with sea water
pump and 300 micron selfcleaning fine filters
› Capacity 3,700 m3/h with one
redundant pump line as stand-by.
› One 10 m3 surge vessel to
mitigate transients at pump trip
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COWI NORTH AMERICA ENERGY
Project City Hall Square - The Tietgensgade plant
› Total capacity, 17.6 MW –
extendable to 25 MW
› Sea water used for free cooling
and condenser cooling
› Free cooling capacity 3 MW
› All chillers are electric VFD-driven
based on ammonia
› 1st floor: Two twin screw chillers
– 3.5 MW
› Ground floor: Two screw chillers
– 4.7 MW + one piston
compressor – 1.2 MW
› Basement: Chilled water pump
stations and free coolers (PHEs)
in basement
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COWI NORTH AMERICA ENERGY
Our 3D
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COWI NORTH AMERICA ENERGY
Some key points
› The two systems are interconnected to increase power efficiency and resilience
for the entire network.
› All electric-driven chillers are ammonia chillers – synthetic refrigerants (green
house gasses and ozone depleting gasses) are not allowed in DK for this
application.
› In Tietgensgade Plant all chillers are operated by variable frequency drives to
optimize plant efficiency.
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COWI NORTH AMERICA ENERGY
Hydraulics and transient analysis
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COWI NORTH AMERICA ENERGY
Questions?
JENS O. HANSEN
President/Managing Director
35 Corporate Drive, Suite 1040
Trumbull CT 06611
Cell: 203-520-0481
E-mail: jha@cowi.com
www.cowi-na-energy.com
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