The document describes the design of Telehouse North Two, a new multi-story indirect air cooled data center in London. Some key points: - It uses an innovative indirect air cooling system with cooling units stacked on an external plant gantry to minimize the footprint. - Sophisticated control strategies and a newly developed emergency water saving mode were developed to achieve industry-leading efficient water and energy consumption with a PUE less than 1.16. - Extensive modeling was done to optimize the building form, cooling system layout, and air flow to ensure adequate cooling distribution throughout the data halls.

1. TELEHOUSE NORTH TWO
A WORLD FIRST IN DATA CENTRE COOLING

2. Smallest footprint and weight per kW.
Speakers
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
Mark Collins
Director
Andrew Dewing
Technical Services Director
Malcolm Howe
Partner Critical Systems

3. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
Contents
Highly developed , tested and independently
verified control strategies.
INDIRECT COOLING – Technology Overview
TELEHOUSE NORTH 2 – The Design Challenge
TELEHOUSE NORTH 2 – The Design Solution

4. Smallest footprint and weight per kW.
Contents
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
INDIRECT COOLING – Technology Overview

5. INDIRECT
Leverage natural cooling properties of outdoor air but keep contamination out.
Outdoor air cools indoor air without direct contact.
ADIABTIC & EVAPORATIVE
Decrease temperature of summer outdoor air by increasing moisture content.
INDIRECT adiabatic & evaporative

6. What's in the box?
H X
Room air
Outdoor air
ECDC Plug Fans
DX cooling coil
DX condenser coil
Adiabatic misting system

7. UK design ambient condition
Heat exchanger entering condition
35°C
25% RH
21°C
SECONDARY air at summer peak

8. 0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
Jan Feb Mar Apr May June Jul Aug Sep Oct Nov Dec
Dry Bulb
Wet Bulb
Free cooling threshold to maintain 27°C supply Temp
OPERATIONAL thresholds
ASHRAE WDView50 London
Heathrow Temperature Data

9. The largest energy consuming element apart from the IT load is the Compressor!!
SOLUTION – reduce or completely remove dependency on mechanical cooling
Where does the power go?
Traditional Systems
Excool
100%
50%
25%
75%
IT Load Cooling Electrical Losses
DATACENTRE asset efficiency

10. City % Free Cooling Mech Cooling Hours pPUE
Recommended Allowable Recommended Allowable
London 100 100 0 0 1.030
Paris 99.95 100 4 0 1.031
Amsterdam 99.99 100 1 0 1.030
Madrid 99.95 100 4 0 1.032
Moscow 100 100 0 0 1.027
New York 97.91 100 183 0 1.039
Riyadh 99.95 100 4 0 1.071
• ‘Recommended’ and ‘Allowable’ refer to the environmental control envelopes recommended by ASHRAE TC 2011 Thermal Guidelines for Data Processing Environments
• Based upon 1MW IT load running at an annualised average of 75%
• Data Source ASHRAE weather data viewer 4.0
• Supply temp 24°C, return 36°C. Supply temp allowed to rise to 27°C (recommended) and 32°C (allowable).
• Aisle containment in place maintaining a 12K ΔT between supply and return.
• Resilience based on N+1 and pPUE calculated with all units running.
• pPUE = (Cooling input power + IT power ) ÷ IT power
Key observation – PUE of ≤ 1.15 achievable in many locations
EXCOOL global efficiency

11. Compact design
Highly efficient
Controls
Water storage
Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
SIX years of R&D
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%

12. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
Contents
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
TELEHOUSE NORTH 2 – The Design Challenge

13. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
Introduction to the Telehouse Campus
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
Site Context
• Telehouse has operated at East India
Dock since 1990, close to Canary Wharf
and the City of London.
• Major connectivity hub for the UK
• Significant power available via our own
132kV substation and the 11kV local
utility.
• Adjacent vacant site offers opportunity
for further development of the
Telehouse campus
Opportunity for Expansion was too Good to Miss!

14. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
Introduction to Telehouse North 2 Project
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
How Best to Exploit this Opportunity?
DC Design has moved on since our last
project - Telehouse West. Customer
demands now along the lines of:
• High efficiency/low PUE
• Flexible and scalable power requirements
based on base design power density of
2kW/m2 up to bespoke High Density
requirements.
• Flexible and scalable connectivity
Requirement for high resilience, high
availability.

15. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
TN2 - High Level Requirements
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
Telehouse Requirements
• High rise solution required – because of plot
size.
• Best in Class PUE < 1.2 (better than any CW
solution and making best use of available
power on site)
• Ability to serve HD requirements on all floors
• BREEAM Excellent rating
• Redundancy in components and systems
• No single points of failure
• Concurrently maintainable

16. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
TN2 – Cooling Solution
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
Considerations:
PUE Target necessitates Outside Air based
cooling solution. Direct or Indirect?
• Urban location, with lots of traffic pollution -
Extent of filtration needed with Direct Air
• Need for full cooling back-up with Direct Air
• Roof allocated to ancillary plant for plant
room cooling and specific High Density
Cooling
Indirect does not have outside air issues and no
need for back-up cooling system
Telehouse Preference for Indirect Air Cooling
Solution!

17. Smallest footprint and weight per kW.
TN2 – Project Brief
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
The Challenge:
To develop a multi-storey, indirect air cooled
data centre, providing sufficient capacity to
deliver 2kW/m2 average load
To provide ancillary cooling system to deliver
maximum possible High Density capacity
Best in Class PUE < 1.2
BREEAM Excellent Rating
Concurrently maintainable - Redundancy in
components and systems, with no single points
of failure.
Challenge to the Cundall Team was to provide
the Solution!

18. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
Contents
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
TELEHOUSE NORTH 2 – The Design Solution

19. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
TN2 – Project Overview
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
Design Overview:
• 6no IAC-Cooled Technical Halls of 1,200m2 per floor,
providing total IT Load of 13.68MW
• 528 Racks per floor @ 4.32kW per Rack, providing
2.281MW of IT Load per Floor
• Indirect air cooling system (IAC) to Technical floors. Units
located on external gantry
• Annualised PUE <= 1.16
• Space provision to add cooling plant to support
additional 2.4MW of High Density IT Cooling
• Chilled water / Free Cooling to plant areas
• Development designed to meet BREEAM Excellent

20. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
TN2 – Drivers and Challenges
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
Design Drivers and Challenges:
• Deliver sufficient Technical Space on a confined site:
• Multi-Storey Data Centre
• Limited Roof Plant Area, relative to Technical Area
• Provide Next Generation Data Centre:
• Low Energy Operation / Low PUE
• Flexibility to suit Tenant Fit-out Requirements
• ASHRAE TC 9.9 Class A1 Environment
• Obtain LPA & GLA Planning Approval:
• Gateway Building to Tower Hamlets
• Meet Energy Targets of BREEAM Excellent
Indirect Air Cooling (IAC) solution in Multi-Storey
setting. IAC Units stacked on external plant gantry.

21. Independently verified efficient water and
energy consumption.
TN2 – Building Form
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
Ground Floor
Typical Technical
Floor
Building Form follows function – Driven
by IAC Cooling Solution
• Data Halls are 57m wide by 19.5m deep,
to suit single-sided supply of cooling air.
• Technical Halls occupy floors 2 to 7
• IAC units mounted on gantry on Western
face of building from floors 2 to 7
• Chillers and air handling plant on raised
gantry above roof level
• Generator rooms and Meet-me rooms
provided at Ground Floor level
• East façade looks out over arterial route –
Signature Circuit Board Motif

22. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
TN2 – CFD Study of Plant Gantry
Highly developed , tested and independently
verified control strategies.
Key Challenge – Operation of
Evaporative cooling system:
• Localised increase in wet bulb
temperature caused by rising
plume of moist air.
• Risk of De-Rating IAC units
serving Upper Floors.
• CFD analysis to study air
movement patterns under ‘still
air’ conditions.
• Optimal solution to completely
segregate intake and discharge
airstreams.

23. TN2 – Building Form
Key Challenge – Retro-Fitting
of IAC Units onto External
Gantry:
• At Day 1, IAC Units will only
be Installed on Floors 6 and 7.
• Robust strategy needed for
installation of future IAC units,
as progressive floors are
fitted-out.
• Optimal Solution to hoist IAC
Units up inside Gantry from
temporary platforms
constructed at each end of
the building

24. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
TN2 – ‘Flooded Room’ Cooling Arrangement
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%

25. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
TN2 – Overview of ‘Flooded Room’ Cooling Arrangement
Highly developed , tested and independently
verified control strategies.
Key Challenge - Proving adequate
distribution of Cooling Air within
Data Halls:
• Single-sided supply of cooling
air dictated by Building Form.
• Risk of ‘Hot Spots’ caused by
Server Cages
• CFD analysis to study air
movement patterns within Data
Halls, under ‘Normal’ and
‘Failure’ conditions.
• Optimal solution developed for
layout of tenant racks and
return air path through ceiling.

26. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
TN2 – Typical Floor Layouts
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
Wholesale
Floor
Shared Floor

27. Smallest footprint and weight per kW.
Independently verified efficient water and
energy consumption.
TN2 – ‘Flooded Room’ Cooling Arrangement
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
FM Cages
Hot aisle
containment
Wholesale
Hall
Shared Hall

28. Smallest footprint and weight per kW.
TN2 – Process Water System
Highly developed , tested and independently
verified control strategies.
Newly developed emergency water save mode
reduces stored water requirement by a further 30%
Connections to IAC Units
Level 07: 10 No. IAC 300 kW
Level 06: 8 No. IAC 300 kW
Future Stages
Level 02-05Process Water Plant Room A
• Pumps (N+1)
• Multistage filtration + UV
Disinfection
• Break tank
• Water meters
Process Water Plant Room B
• Pumps (N+1)
• Multistage filtration + UV
Disinfection
• Break tank
• Water meters
Mains water supply to
plant room A
Mains water supply to
the plant room B
Mains water supply
to the buried tanks
Water
Tank
160m3
Water
Tank
160m3
Connections to IAC Units

29. Thank You for Your Attention.
Questions