Additional Information1：Validity of PUE as indicator for Energy efficiency
DPPE (Data center Performance Per Energy) is the index for energy efficiency of data center and consists of thefour sub- indices shown in the following table.
DPPE has been developed by Green IT Promotion Council, which is a part of JEITA (Japan Electronics andInformation Technology Industries Association). JEITA has been promoting standardization of DPPE in ISO.
Since facilities for data center, air conditionings and power supply equipment, will realize saving energy in thisproject, PUE which represents the facility energy efficiency should be selected from the four sub- indices shown in
the following table.

Sub-metrics
description

Equation

Corresponding action

ITEU（IT EquipmentUtilization）= Total energy consumption of IT
equipment (actual) /Total rated energy
consumption of IT equipment (rated)

Efficient operation of IT equipment:
Approaches to improve utilization ratio
through consolidation and virtualization andby reducing the number of equipment inoperation.

ITEE（IT Equipment
EnergyEfficiency）= Total rated capacity of IT equipment(rated) /Total rated power of IT
equipment (rated)

Approaches to introduce IT equipment withhigher energy saving performance.

PUE（Power UsageEffectiveness）= Total energy consumption of data
center (actual) /Total energy
consumption of IT equipment (actual)

Approaches to reduce energy consumption
caused by facilities such as efficiency
improvement for air conditioning system andpower transformer system as well as theprograms to use natural environment
effectively

GEC（Green EnergyCoefficient）= Energy level generated by green
energies (natural energies such as
photovoltaic power / wind power)(actual) /Total energy consumption ofdata center (actual)

Approaches to install and use equipment togenerate green energies such as photovoltaic
power, wind power and hydraulic power etc.

GEC was renamed as REF(Renewable Energy Factor) in ISO.
Source：http://home.jeita.or.jp/greenit-pc/topics/release/pdf/dppe_e_20120824.pdf

1【Reference: Status of PUE standardization in ISO】
As of 15 April 2016, International Standard (ISO/IEC 30134-2:2016) for PUE has been published as follows:

Source: http://www.iso.org/iso/catalogue_detail.htm?csnumber=634512

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Additional Information 2:
Validity of “reference PUE value=2.0”
Selection of measured original PUE value
Since there is no data center and measured PUE values in Lao, the measured PUE values in other countries areadapted. The following table shows the PUE surveillance reports which were conducted in various area. Since
Singapore and Lao PDR are relatively similar in climate, we decided to select the measured PUE value =2.07 in
Singapore National Environmental Agency’s report as the original PUE and adjust conservatively it as thereference PUE.
Upon an analysis based on adjustment taking into account the difference in temperature condition between Lao
PDR and Singapore, equivalent PUE value for Lao PDR is estimated as 2.003. The details of the analysis are asshown in the following section. For the sake of the conservativeness, it is concluded that the reference PUE valueof this methodology is 2.0.
Report Name

Surveillance Owner
PeriodData Centre Energy
Efficiency Benchmarking

June 2010September
2012

Report to Congress on Server April 2007
and Data Center Energy
Efficiency Public Law 109431

Number of Annual
dataaveragecenterPUERegion

adjusted
PUE＊Singapore NEA(NationalEnvironmentalAgency)

23

2.07 Singapore

2.003

The United States
EPA(EnvironmentalProtection Agency)

22

2.0 North
America

2.45

N. America Campos Survey
ResultsJanuary 2013 Campos(Privateresearch farm)

300

2.9

FY2010 Green IT Promotion
Council Investigation andanalysis committee
Report(Only Japanese)

June 2010 –January
2011Green IT Promotion
Council(a part of
JEITA:JapanElectronics andInformation
Technology IndustriesAssociation)

25

1.77～ Japan
1.93(notannualaverage.)

FY2014 The Project ofApril 2014supporting energy efficient
March 2015
cloud utilization by small andmedium enterprises(OnlyJapanese)

Japan Ministry ofEconomic, Trade andIndustry

103

1.91

＊Adjusted PUE value is conservatively calculated based on difference of climate conditions between Laos andareas where the original PUE values were measured.

42.003

[Supplementary Information] Analysis on the PUE value based on adjustment
Since the monthly average temperature from March to October in Singapore and Vientiane is equivalent, it isappropriate to use same PUE value = 2.07 in Singapore as PUE value in Vientiane. However, there are thefollowing differences from November to February and it is cooler in Vientiane than Singapore. It is necessary toadjust the average PUE2.07 in Singapore.

Nov
Dec
JanFebVientiane Singapore difference
26.9
27.9
1.0
23.5
27.6
4.1
21.1
26.5
5.4
25.4
27.8
2.4℃
32

30

28
Vientiane

26

Singapore
24

22

20
JanFebMar

AprMayJunJulAug

Sep

Oct

Nov

Dec

2014
Based on Green IT Promotion Council Investigation which was conducted in 2010, PUE is increasing when theaverage outside temperature rises and the difference of PUE in the case of 20 degrees and 30 degrees is themaximum 0.2.
Since March to October temperature in Vientiane exceeds in Singapore, the adjusted PUE value should be higher(worse) value. We took equivalent PUE value =2.07 in this period from the conservative point of view.
On the other hand, November to February temperature in Vientiane falls below in Singapore, the adjusted PUE
value should be lower (better) value. We conservatively adjusted the original PUE value=2.07 assuming that there
is difference 10℃, which greatly exceeds the difference between the actual average temperature.
The adjusted annual PUE in Vientiane is 2.003 as the following formula.
(2.07×8monthes +1.87×4 months)÷12months=2.003
We concluded that the reference PUE value is 2.0 which is lower (worse) than the adjusted PUE value=2.003
form the conservative point of view.
For reference, the adjusted PUE value of the other measured PUE in North America and Japan is also higher(worse) than 2.0.

5Annual average

0.210℃

Data center A
Data center B
Data center C
Data center D
Data center E
Data center F
Monthly Average temperature
Monthly Average temperature and PUE value per Data center

Source: FY2010 Green IT Promotion Council Investigation and analysis committee Report(Only Japanese) P119

Source of Reference Report
Name of Report

URL

Data Centre Energy Efficiency
Benchmarking

http://www.e2singapore.gov.sg/DATA/0/docs/Resources/NEA%20
DC%20Energy%20Benchmarking%20Summary%20Final%20Report%20(3).pdf

Report to Congress on Server and Data
Center Energy Efficiency Public Law
109-431https://www.energystar.gov/ia/partners/prod_development/download
s/EPA_Datacenter_Report_Congress_Final1.pdf

N. America Campos Survey Results

https://www.digitalrealty.com/information-library/

FY2010 Green IT Promotion CouncilInvestigation and analysis committee
Report(Only Japanese)

http://home.jeita.or.jp/greenitpc/activity/reporting/110628/pdf/survey04.pdf

FY2014 The Project of supporting
energy efficient cloud utilization bysmall and medium enterprises(OnlyJapanese)

http://www.meti.go.jp/policy/it_policy/green-cloud/report_.pdf

6Additional Information 3:
Airtightness indicator
We selected the IP code as airtightness indicator. The IP Code, International Protection Marking, IEC standard
60529 classifies and rates the degree of protection provided against intrusion (body parts such as hands andfingers), dust, accidental contact, and water by mechanical casings and electrical enclosures. It is published by
the International Electrotechnical Commission (IEC).
The IP code consists of 4word including IP as following.
IPxx
The first and the second digit indicate the level of protection. The methodology requests IP54 and better .
[Solid particle protection]
The first digit indicates the level of protection that the enclosure provides against access to hazardous parts (e.g.,
electrical conductors, moving parts) and the ingress of solid foreign objects
level Object size protectedagainstEffective against0 —No protection against contact and ingress of objects

1 >50 mm

Any large surface of the body, such as the back of a hand, but no protection
against deliberate contact with a body part2 >12.5 mm

Fingers or similar objects

3 >2.5 mm

Tools, thick wires, etc.

4 >1 mmMost wires, slender screws, ants etc.

5 Dust protected

Ingress of dust is not entirely prevented, but it must not enter in sufficient quantity
to interfere with the satisfactory operation of the equipment.

6 Dust tight

No ingress of dust; complete protection against contact (dust tight)[Liquid ingress protection]
The second digit indicates the level of protection that the enclosure provides against harmful ingress of waterlevel Protected against

Effective against

Details

0 Not protected——

1 Dripping water

Dripping water (vertically falling drops) shallhave no harmful effect.

Test duration: 10 minutes
Water equivalent to 1 mm rainfall per
minuteDripping water
2 when tilted up to15°

Vertically dripping water shall have no harmful
effect when the enclosure is tilted at an angle up
to 15° from its normal position.

Test duration: 10 minutes
Water equivalent to 3 mm rainfall per
minute3 Spraying water

Water falling as a spray at any angle up to 60°
from the vertical shall have no harmful effect.

Test duration: 5 minutes
Water volume: 0.7 litres per minutePressure: 50–150 kPa

7

Water splashing against the enclosure from any
direction shall have no harmful effect.

Test duration: 5 minutes
Water volume: 10 litres per minutePressure: 50–150 kPa

Water projected by a nozzle (6.3 mm) against
enclosure from any direction shall have noharmful effects.

Test duration: at least 3 minutes
Water volume: 12.5 litres per minutePressure: 30 kPa at distance of 3 m

Powerful waterjets

Water projected in powerful jets (12.5 mm nozzle)
against the enclosure from any direction shallhave no harmful effects.

Test duration: at least 3 minutes
Water volume: 100 litres per minutePressure: 100 kPa at distance of 3 m

Powerful water
6K jets with increased
pressure

Water projected in powerful jets (6.3 mm nozzle)
against the enclosure from any direction, underelevated pressure, shall have no harmful effects.

Test duration: at least 3 minutes
Water volume: 75 litres per minutePressure: 1000 kPa at distance of 3 m

Immersion up to1m

Ingress of water in harmful quantity shall not be
possible when the enclosure is immersed in water
under defined conditions of pressure and time (upto 1 m of submersion).

Test duration: 30 minutes
Tested with the lowest point of theenclosure 1000 mm below thesurface of the water, or the highest
point 150 mm below the surface,whichever is deeper.

The equipment is suitable for continuous
immersion in water under conditions which shallbe specified by the manufacturer. However, withcertain types of equipment, it can mean that watercan enter but only in such a manner that it
produces no harmful effects.

Test duration: continuous immersion
in water
Depth specified by manufacturer,
generally up to 3 m

Protected against close-range high pressure, hightemperature spray downs.

Test duration: Water volume: 14–16 litres per
minutePressure: [8000–10000 kPa / 80–100Bar] at distance of 0.1–0.15 m
Water temperature: 80 °C

4Splashing ofwater

5 Water jets

67Immersion
8
beyond 1 m

Powerful high
9K temperature waterjets8