Datacenter Dynamics ZETTASTRUCTURE, NOV 1 - NOV 2 2016 Nov 02 12:40 Keynote: Full scale energy reuse from a data center: An implementation guide (technical walk-through) Mattias Ganslandt, CBD, Open District Heating

1. www.dcdconverged.com
Open District Heating and District Cooling:
Enabling and Incentivizing Large Scale Heat
Recovery in Stockholm
Mattias Ganslandt, Chief Business Developer, Fortum Värme
London, November 2, 2016

2. www.dcdconverged.com
Renewable Electricity as a Foundation for Efficient and Sustainable Computing
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Pence/kWh
Eurocent/kWh
* Calculated with proposed new tax for 0,5 MW+ data centers from January 1, 2017
Data Center Electricity Cost in Stockholm
2017-2026*
Electricity and
electricity distribution
Average
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TWh / year
Longrun Additional Supply of Wind Power in
Sweden

3. www.dcdconverged.com3
Heat
Pumps
CHP
District
Heating
Data
Center
Cooling
Machine
Cond.
Power
Data
Center
Heat
Rejection
Heat
Rejection
Heat
Recovery
Heat
Recovery
Fossil
fuels
Renewable
fuels
The Way ForwardThe Old Ways
Open District Heating enables data centers to recover heat and turn waste
heat into revenue. Complements include renewable electricity, connectivity and reliable power distribution.

4. www.dcdconverged.com
A quick look at cost
Stockholm EUR/kW, mo GBP/kW, mo c€/kWh p/kWh
Electricity* incl. distribution 31,6 28,5 4,3 3,9
Open district heating revenue -14,5 -13,1 -2,0 -1,8
Co-lo service excl power 161,0 145,3 22,1 19,9
Cost to compute** 183,2 165,3 25,1 22,7
* Calculated with proposed data center tax on electricity from January 1, 2017
** Calculated with PUE=1,3 and 1 MW IT load
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5. www.dcdconverged.com
Urban Heat Recovery and Sustainable Energy – Illustration 1
Example: KVV8
• New Biofueled CHP plant operational in 2016
• Biofuel 400 MW (forest residue, wood chips)
• Thermal boiler capacity 330 MW
– Electric power generation 130 MW
– District heating output 200 MW
• Flue gas condensation 80 MW
• Energy efficiency 102%
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6. www.dcdconverged.com
Urban Heat Recovery with District Cooling – Illustration 2
• Kista Heat Recovery plant is built to serve all the district
cooling customers in Kista – both process cooling customers
(such as data centers) and other cooling customers (such as
offices, shops, hotels and restaurants). In the Summer, we
meet peak load demand using cooling machines with
evaporative cooling towers. In the Winter, we recover heat
from the district cooling network with heat pumps.
• Quick facts:
1. Kista Heat Recovery Plant was built in 2000
2. There are 6 cooling machines in the plant. The peak load cooling
capacity in the summer is approximately 48 MW. The largest,
machine no 6, has a cooling capacity of 13 MW.
3. Three of the machines (HP1, HP2, HP3) can operate as heat
pumps and produce district heating with a combined heat
recovery capacity of 18 MW and a district heating capacity of 27
MW
4. COP (the Coefficient of Performance) is approximately 3 when
district heating is produced
5. Machine no 3 has two compressors that can work in parallel
during the Summer (cooling capacity 10,8 MW) and in series in
the Winter (6 MW cooling), which allows for a leaving condensor
temperature up to 78 °C
6

7. www.dcdconverged.com
Urban Heat Recovery with Open District Heating
®
– Illustration 3
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• Cool the data center with a heat
pump
• Sell excess heat to the district
heating network
• (Option) Sell surplus cooling capacity
to the district cooling network
• Long term and transparent
contracts,10 + 5 years
• The data center invests in the heat
pump
• Fortum Värme invests in the
connection to the distribution system

8. www.dcdconverged.com
Pilots since 2014 – Learning by Doing
The technical setup – an example
Note that there are some specific hydro-technical solutions not visible on this page required for stable operations, so this is not the “blue print”

9. www.dcdconverged.com
Optimizing the Data Center for Sustainability and Efficiency
18 m 2 m
2 m
n
0.6n m
2
1
Cooling Plant with 10 heat
pumps
6 m
Cooling Unit 1 Cooling Unit 1 Cooling Unit N
6,6 meters x N
1. A Higher Evaporator Leaving Water Temp Yields
Larger Cooling Capacity of the Cooling Plant
2. A Higher Evaporator Leaving Water Temp Yields
Smaller Cooling Capacity of the Cooling Coils
3. A Higher Evaporator Leaving Water Temp Yields
Shorter Rows in the Data Room
4. A Higher Evaporator Leaving Water Temp Yields
Higher Air Inlet Temp to the Servers

10. www.dcdconverged.com
Cost Minimizing Temperature (17°C)
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Investmentcost,SEK/kW
cooling
Evaporator leaving water temperature (°C)
Investment Cost per kW of Cooling Capacity
Total investment
Building & land
Cooling
production
Cooling
distribution
Minimum
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compute
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Investment cost per kW of Computing Capacity
Total investment
Building & land
Cooling production
Cooling distribution
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Cost,SEK/kWcooling,
year
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Total cost per kW of Cooling Capacity
Total cost
Variable cost
Fixed cost
Minimum
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Cost,SEK/kWcompute,
year
Evaporator leaving water temperature (°C)
Total cost per kW of Computing Capacity
Total cost
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Fixed cost
Minimum

11. www.dcdconverged.com
Making District Heating More Heat Recovery Friendly
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Smooth the
heating
load
Reduce the
district heating
temperature
Improve the
cooling of district
heating water
Increase the
seasonal thermal
storage capacity
Find new markets
for low temperature
heating

12. www.dcdconverged.com
Conclusions
Advice to C-level:
1. Let access to abundant and reliable supply of renewable electricity influence your global strategy
2. Make potential for large scale heat recovery a site selection criteria
3. Optimize the design for efficient and sustainable operations
4. Look for synergies and trade opportunities with your neighbours
5. Prepare for the competition from the north
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13. www.dcdconverged.com
Don’t Waste Your Energy!
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Mattias Ganslandt, Ph D
Chief Business Developer
Mobile: +46 705 194 524
E-mail: mattias.ganslandt@celec.eu
LinkedIn: www.linkedin.com/in/mattiasganslandt