JCM_TH_AM006_ver01.0
Sectoral scopes: 03 and 04
Joint Crediting Mechanism Approved Methodology TH_AM006“Installation of Displacement Ventilation Air Conditioning Unit in the Cleanroom ofSemiconductor Manufacturing Factory”
A. Title of the methodology
Installation of Displacement Ventilation Air Conditioning Unit in the Cleanroom ofSemiconductor Manufacturing Factory, Version 01.0

B. Terms and definitions
Terms
Displacement ventilation

Definitions
Air distribution technology that introduces conditioned air
into a zone at a low velocity (less than 1.0 m/s) via diffusers
located either at near floor level or middle space of a roomand spreads the supply air over the floor to displace thewarmer air from the occupied zone toward the ceiling forventilation.

Displacement ventilation airconditioning unit

A supplying unit of conditioned air with application ofdisplacement ventilation technology. The unit doesn’t include
outdoor-air processing units.

Mixing ventilation

A traditional air distribution technology that uses turbulent orlaminar flow of fresh air supplied from the ceiling level sothat mix and dilute any existing warmer air with suppliedclean and conditioned air.

Mixing ventilation air
conditioning unit

A supplying unit of conditioned air with application of
mixing ventilation technology.

Airborne particulate cleanliness

The level of cleanliness specified by the maximum allowable

class

number of particles per cubic meter of air (per cubic foot ofair).

Outdoor-air processing unit

The unit for processing the outdoor fresh air that is taken infor ventilation and/or for keeping the pressure inside a clean
room a predetermined positive value. The unit also
constituted of air filters and heating or cooling coils so thatthe outside air is brought to a required state of temperature,1

JCM_TH_AM006_ver01.0
Sectoral scopes: 03 and 04
humidity, and cleanliness before letting the outside air in.

C. Summary of the methodology
Items
GHG

emission

Summary
reduction Installation of displacement ventilation air conditioning unit tomeasures

improve energy efficiency of supplying conditioned air to thecleanroom of semiconductor plant leads to reduction of power
consumption for ventilation.

Calculationofreference Reference emissions are calculated by multiplying power

emissionsconsumption of mixing ventilation air conditioning unit, theproportion of motive power of reference mixing ventilation airconditioning unit and project displacement ventilation air
conditioning unit, and CO2 emission factor for electricityconsumed.

Calculationofproject Project emissions are calculated by multiplying total power

emissionsconsumption of displacement ventilation air conditioning unit
and CO2 emission factor for electricity consumed.

Monitoring parameters

The amount of power consumption by project displacement
ventilation air conditioning unitThe amount of fuel consumption and the amount ofelectricity generated by captive power, where applicableD. Eligibility criteria
This methodology is applicable to projects that satisfy all of the following criteria.
Criterion 1

Displacement ventilation air conditioning unit, whose specification of velocity ofthe discharged air is designed to be more than 0.5 m/s and equals to or less than
1.0 m/s, is installed in the cleanroom of semiconductor plant.

Criterion 2

The project displacement ventilation air conditioning unit is constituted of atleast cooling coil, HEPA (high efficiency particular air) or ULPA (ultra lowpenetration air) filter and air supply fan in one unit.

Criterion 3

The project displacement ventilation air conditioning unit is designed to meet the2

JCM_TH_AM006_ver01.0
Sectoral scopes: 03 and 04
threshold values of Class 6 or class 7 of airborne particulate cleanliness class setby ISO 14644-1:20151.
Criterion 4

The project displacement ventilation air conditioning unit only supplies cooledair.

E. Emission Sources and GHG types
Reference emissions
Emission sources

GHG types

Power consumption by mixing ventilation air conditioning unit

CO2

Power consumption by reference outdoor-air processing unit (excluded CO2
from calculation of reference emissions)Power consumption by reference chiller (excluded from calculation of CO2
reference emissions)Power consumption by reference exhaust fan (excluded from calculation CO2of reference emissions)
Project emissions
Emission sources

GHG types

Power consumption by displacement ventilation air conditioning unit

CO2

Power consumption by project outdoor-air processing unit (excluded CO2
from calculation of project emissions)Power consumption by project chiller (excluded from calculation of CO2
project emissions)Power consumption by project exhaust fan (excluded from calculation CO2of project emissions)

F. Establishment and calculation of reference emissions
F.1. Establishment of reference emissions
Reference emissions are consisted of emissions from mixing ventilation air conditioning unit,
outdoor-air processing unit and chillers supplying chilled water to cooling coil.
The temperature of outlet chilled water of the chiller is set higher (e.g. 14 degrees Celsius) with
1

Cleanrooms and associated controlled environments -- Part 1: Classification of air cleanlinessby particle concentration3

JCM_TH_AM006_ver01.0
Sectoral scopes: 03 and 04
displacement ventilation air conditioning unit compared to that with mixing ventilation airconditioning unit (e.g. 7 degrees Celsius). It is because displacement ventilation airconditioning unit diffuses conditioned air at floor level or middle space of a room while mixing
ventilation air conditioning unit does from air supply ports located on the ceiling. Therefore, theheat load handled by the chillers in the case of displacement ventilation gets lower, and it leads
to reduction of power consumption by the chillers.
In this methodology, GHG emissions reductions of chillers caused by the difference of heat load
are not included in the calculation of total GHG emission reductions to ensure the net emission
reductions.

F.2. Calculation of reference emissionsܴ‫ܧ‬௣ = ෍ ෍ ෍ ቆ‫ܥܧ‬௉௃,஽௏,௜,௝,௞,௣ ×
௜

with௝

௞

‫ܮ‬ோா,௝,௞ =‫ܮ‬௉௃,௝,௞ =‫ܮ‬ோா,௝,௞
× ‫ܨܧ‬௘௟௘௖,௞ ቇ‫ܮ‬௉௃,௝,௞

ܲௗ,ோா,௝,௞ × ‫ܴܨܣ‬ோா,௝,௞
1,000 × ߟோா,௝,௞
ܲௗ,௉௃,௝,௞ × ‫ܴܨܣ‬௉௃,௝,௞
1,000 × ߟ௉௃,௝,௞‫ܴܨܣ‬ோா,௝,௞ =ܸ௖௥,௝,௞ × ܶ௩௘௡௧,௝,௞
3,600‫ܴܨܣ‬௉௃,௝,௞ = ෍ ‫ܴܨܣ‬௉௃,௜,௝,௞௜ߟோா,௝,௞ = ߟ௉௃,௝,௞

* Since the fans with similar type and specification are installed both in displacement
ventilation air conditioning unit and mixing ventilation air conditioning unit, energy efficiencyof the fans are considered to be equal.
Thereforeܴ‫ܧ‬௣ = ෍ ෍ ෍ ቆ‫ܥܧ‬௉௃,஽௏,௜,௝,௞,௣ ×௜௝௞‫ܮ‬ோா,௝,௞
× ‫ܨܧ‬௘௟௘௖,௞ ቇ‫ܮ‬௉௃,௝,௞= ෍ ෍ ෍ ቆ‫ܥܧ‬௉௃,஽௏,௜,௝,௞,௣ ×௜௝௞Where4ܲௗ,ோா,௝,௞ × ‫ܴܨܣ‬ோா,௝,௞
× ‫ܨܧ‬௘௟௘௖,௞ ቇܲௗ,௉௃,௝,௞ × ‫ܴܨܣ‬௉௃,௝,௞

JCM_TH_AM006_ver01.0
Sectoral scopes: 03 and 04ܴ‫ܧ‬௣‫ܥܧ‬௉௃,஽௏,௜,௝,௞,௣Reference emissions during the period p [tCO2/p]
The amount of power consumption by the project displacement ventilation airconditioning unit i in cleanroom j of the project factory k during the period p[MWh/p]‫ܮ‬ோா,௝,௞‫ܮ‬௉௃,௝,௞‫ܨܧ‬௘௟௘௖,௞

ܲௗ,ோா,௝,௞

ܲௗ,௉௃,௝,௞‫ܴܨܣ‬ோா,௝,௞‫ܴܨܣ‬௉௃,௝,௞
ߟோா,௝,௞

Motive power of reference mixing ventilation air conditioning unit(s)supplying air to cleanroom j in the project factory k [kW]Motive power of project displacement ventilation air conditioning unit(s)supplying air to cleanroom j in the project factory k [kW]CO2 emission factor for consumed electricity in the project factory k[tCO2/MWh]
Discharge pressure of reference mixing ventilation air conditioning unit(s)supplying air to cleanroom j in the project factory k [Pa]
Discharge pressure of project displacement ventilation air conditioning
unit(s) supplying air to cleanroom j in the project factory k [Pa]Airflow rate of reference mixing ventilation air conditioning unit(s)supplying air to cleanroom j in the project factory k [m3/s]
Airflow rate of project displacement ventilation air conditioning unit(s)supplying air to cleanroom j in the project factory k [m3/s]
Fan efficiency of reference mixing ventilation air conditioning unit(s)supplying air to cleanroom j in the project factory k [-]ߟ௉௃,௝,௞

Fan efficiency of project displacement ventilation air conditioning unit(s)ܶ௩௘௡௧,௝,௞

Number of times of ventilation required for the cleanroom j in the projectܸ௖௥,௝,௞

supplying air to cleanroom j in the project factory k [-]Volume of the cleanroom j in the project factory k [m3]factory k [times/h]‫ܴܨܣ‬௉௃,௜,௝,௞

Airflow rate of project displacement ventilation air conditioning unit ii

Identification number of the displacement ventilation air conditioning unitjIdentification number of the cleanroomkIdentification number of the factory

supplying air to cleanroom j in the project factory k [m3/s]

Emissions from power consumption by reference outdoor-air processing unit(s) and project
outdoor-air processing unit(s) are considered to be equal. Emissions from power consumption
by reference exhaust fan(s) and project exhaust fan(s) are also considered to be equal.
Therefore, both of them are not included in calculation of reference emissions and projectemissions.
Emissions from power consumption by reference chiller(s) are not included in calculation of5

JCM_TH_AM006_ver01.0
Sectoral scopes: 03 and 04
reference emissions as explained in F.1 of this methodology.

G. Calculation of project emissionsܲ‫ܧ‬௣ = ෍ ෍ ෍൫‫ܥܧ‬௉௃,஽௏,௜,௝,௞,௣ × ‫ܨܧ‬௘௟௘௖,௞ ൯௜

Whereܲ‫ܧ‬௣௝௞

Project emissions during the period p [tCO2/p]‫ܥܧ‬௉௃,஽௏,௜,௝,௞,௣

The amount of power consumption by the displacement ventilation air
conditioning unit i in cleanroom j of the project factory k during the period p[MWh/p]‫ܨܧ‬௘௟௘௖,௞

CO2 emission factor for consumed electricity in the project factory k[tCO2/MWh]i

Identification number of the displacement ventilation air conditioning unitjIdentification number of the cleanroomk

Identification number of the factory

Emissions from power consumption by reference outdoor-air processing unit(s) and project
outdoor-air processing unit(s) are considered to be equal. Emissions from power consumption
by reference exhaust fan(s) and project exhaust fan(s) are also considered to be equal.
Therefore, both of them are not included in calculation of reference emissions and projectemissions.
Emissions from power consumption by project chiller(s) are not included in calculation ofproject emissions as explained in F.1 of this methodology.

H. Calculation of emissions reductions

Where‫ܴܧ‬௣ܴ‫ܧ‬௣‫ܴܧ‬௣ = ܴ‫ܧ‬௣ − ܲ‫ܧ‬௣Emission reductions during the period p [tCO2/p]
Reference emissions during the period p [tCO2/p]6

JCM_TH_AM006_ver01.0
Sectoral scopes: 03 and 04
ܲ‫ܧ‬௣

Project emissions during the period p [tCO2/p]

I. Data and parameters fixed ex ante
The source of each data and parameter fixed ex ante is listed as below.
Parameter

Description of data‫ܴܨܣ‬ோா,௝,௞

Airflow rate of reference mixing ventilation

SourceCalculated

air conditioning unit(s) supplying air tocleanroom j in the project factory k
Calculated with the following equation:‫ܴܨܣ‬௉௃,௝,௞‫ܴܨܣ‬ோா,௝,௞ =ܸ௖௥,௝,௞ × ܶ௩௘௡௧,௝,௞
3,600

Airflow rate of project displacement

Design document orventilation air conditioning unit(s) supplying

specification document of the

air to cleanroom j in the project factory kdisplacement ventilation airconditioning unit.

One value is determined ex ante for eachproject cleanroom. Where outdoor-air
processing units are supplying air to one
cleanroom, the total value is applied.
ܲௗ,ோா,௝,௞

Discharge pressure of reference mixing

Hearing survey withventilation air conditioning unit(s) supplying

manufacturer of mixing

air to cleanroom j in the project factory k [Pa]ventilation air conditioningunit.

The default value of [1,200] is applied.
ܲௗ,௉௃,௝,௞

Discharge pressure of project displacement

Design document orventilation air conditioning unit(s) supplying

specification document of the

air to cleanroom j in the project factory kdisplacement ventilation airconditioning unit.

One value is determined ex ante for eachproject cleanroom.
ܸ௖௥,௝,௞

Volume of the cleanroom j in the project

Design document of thefactory kcleanroom.

7

JCM_TH_AM006_ver01.0
Sectoral scopes: 03 and 04
The value is determined by the actual volumeof the cleanroom where the project inimplemented.
ܶ௩௘௡௧,௝,௞

Number of times of ventilation required for

Published documents on thethe cleanroom j in the project factory kweb.

The default value from the following table isapplied corresponding to the airborne
particulate cleanliness class required for thecleanroom j.
cleanliness class‫ܨܧ‬௘௟௘௖,௞

ISO

FED-14644-1:2015

STD-209E

ܶ௩௘௡௧,௝,௞

Class 61,00080

Class 7

10,00040

CO2 emission factor for consumed electricity.

[Grid electricity]

When project chiller consumes only grid The most recent value available
electricity or captive electricity, the project at the time of validation isparticipant applies the CO2 emission factor applied and fixed for therespectively.

monitoring period thereafter.
The data is sourced from “GridWhen project chiller may consume both grid EmissionFactor(GEF)

ofelectricity and captive electricity, the project Thailand”,endorsedbyparticipant applies the CO2 emission factor Thailand

Greenhouse

Gaswith lower value.

Management

Organization

unless otherwise instructed by[CO2 emission factor]

the Joint Committee.

For grid electricity: The most recent value
available from the source stated in this table at [Captive electricity]
the time of validation

For the option a)Specification of the captive

For captive electricity, it is determined based

power

generationon the following options:provided by the manufacturer(ηelec [%]).
8systemJCM_TH_AM006_ver01.0
Sectoral scopes: 03 and 04a) Calculated from its power generation

CO2 emission factor of theefficiency (ηelec [%]) obtained fromfossil fuel type used in the

manufacturer’s specification

captive

The power generation efficiency based onsystem (EFfuel [tCO2/GJ])

power

generation

lower heating value (LHV) of the captive
power generation system from theFor the option b)

manufacturer’s specification is applied;

Generated‫ܨܧ‬௘௟௘௖ = 3.6 ×100× ‫ܨܧ‬௙௨௘௟ߟ௘௟௘௖andsupplied

electricity by the captive power
generation

system(EGPJ,p[MWh/p]).

b) Calculated from measured data

Fuel amount consumed by theThe power generation efficiency calculated

captive

powergenerationfrom monitored data of the amount of fuelsystem(FCPJ,p[massinput for power generation (‫ܥܨ‬௉௃,௣ ) and theweight/p]).

during the monitoring period p is applied. The[GJ/mass or weight]) and CO2amount of electricity generated (‫ܩܧ‬௉௃,௣ )orNet calorific value (NCVfuelmeasurement is conducted with the monitoring emission factor of the fuelequipment to which calibration certificate is(EFfuel [tCO2/GJ]) in order ofissued by an entity accredited under

preference:national/international standards;

1) values provided by the fuel‫ܨܧ‬௘௟௘௖ = ‫ܥܨ‬௉௃,௣ × ܰ‫ܸܥ‬௙௨௘௟ × ‫ܨܧ‬௙௨௘௟ ×Where:1‫ܩܧ‬௉௃,௣

supplier;2) measurement by the project
participants;ܰ‫ܸܥ‬௙௨௘௟ : Net calorific value of consumed 3) regional or national default

fuel [GJ/mass or weight]

values;4)

IPCC

default

valuesNote:provided in tables 1.2 and 1.4

In case the captive electricity generationof Ch.1 Vol.2 of 2006 IPCC

system meets all of the following conditions,Guidelines on National GHG

the value in the following table may be

Inventories. Lower value isapplied to ‫ܨܧ‬௘௟௘௖ depending on the consumedapplied.

・ The system is non-renewable generation

fuel]fuel type.

[Captive electricity with diesel
CDM approved small scale

system・ Electricity generation capacity of thesystem is less than or equal to 15 MW
9methodology: AMS-I.A.

JCM_TH_AM006_ver01.0
Sectoral scopes: 03 and 04[Captive electricity with natural
fuel type‫ܨܧ‬௘௟௘௖Diesel
fuel

Natural gas

0.8 *10.46 *2gas]
2006 IPCC Guidelines on
National GHG Inventories forthe source of EF of natural gas.

*1 The most recent value at the time of

CDM Methodological tool

validation is applied.

"Determining the baseline*2 The value is calculated with the equation in

efficiency of thermal or electric

the option a) above. The lower value of default

energy generation systems

effective CO2 emission factor for natural gas

version02.0" for the default(0.0543tCO2/GJ), and the most efficient value

efficiency for off-grid powerof default efficiency for off-grid gas turbine

plants.

systems (42%) are applied.

History of the document
Version01.0

Date
21 August 2017

Contents revised
JC3, Annex 8
Initial approval.

10