JCM_TH_AM002_ver021.0
Sectoral scope: 03
Joint Crediting Mechanism Approved Methodology TH_AM002“Energy Saving by Introduction of Multi-stage Oil-Free Air Compressor”
A. Title of the methodology
Energy Saving by Introduction of Multi-stage Oil-Free Air Compressor, Version 21.0

B. Terms and definitions
Terms

Definitions

Multi-stage oil-free air

A device with more than one compression stage withoutcompressor

using lubricating oil to compress air, nitrogen or inert gases
to make the pressure of gas higher than that of the inlet.

Specific conditions

The specific conditions for this methodology are defined asbelow, following ISO 1217:2009.
Ambient temperature = 20 degrees Celsius,
Ambient pressure = 0 MPa (Gauge pressure),
Relative humidity = 0%,
Cooling water/air = 20 degrees Celsius,
Effective working pressure at discharge valve = 0.7 MPa(Gauge pressure).

Free air delivery (FAD)

The actual quantity of compressed air converted to the inlet
conditions of the compressor. The unit is m3/min.

Periodical check

A periodical investigation of air compressor conducted bymanufacturer or agent who is authorized by the manufacturer,
in order to maintain air compressor performance.

Specific power (SP)An indicator of efficiency of air compressor, calculated withelectric motor power (nominal output power) [kW] and freeair delivery [m3/min]‫= ۾܁‬

C. Summary of the methodology

1‫]܅ܓ[ ܚ܍ܟܗܘ ܚܗܜܗۻ‬۴‫ۯ‬۲ [‫ܕ‬૜ /‫]ܖܑܕ‬JCM_TH_AM002_ver021.0
Sectoral scope: 03
Items
GHG

emission

Summaryreduction This methodology applies to the project that aims at saving

measuresenergy by introducing multi-stage oil-free air compressor in
manufacturing process of semiconductors.

Calculation

ofreference Reference emissions are GHG emissions from using referenceemissions

air compressor, calculated with power consumption of project
air compressor, specific power (SP) of reference/project air
compressors and CO2 emission factor for electricity consumed.

Calculationofproject Project emissions are GHG emissions from using project airemissions

compressor, calculated with power consumption of project air
compressor and CO2 emission factor for electricity consumed.

Monitoring parametersPower consumption of project air compressorThe amount of fuel consumed and the amount of electricity
generated by captive power, where applicable.

D. Eligibility criteria
This methodology is applicable to projects that satisfy all of the following criteria.
Criterion 1

Project air compressor is a non-inverter type multi-stage oil-free air compressor
with an electric motor power of 55kW, 75kW, 110kW, 132kW, 145kW, 160kW,
or 200kW installed in manufacturing process of semiconductors.

Criterion 2

Periodical check is planned more than one (1) time annually.

E. Emission Sources and GHG types
Reference emissions
Emission sources

GHG types

Electricity consumption by air compressor

CO2

Project emissions
Emission sources

GHG types

Electricity consumption by air compressor

CO2

F. Establishment and calculation of reference emissions
F.1. Establishment of reference emissions
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Sectoral scope: 03

Reference emissions are calculated by multiplying power consumption of project aircompressor, specific power (SP) for reference/project air compressors, and CO2 emission factor
for electricity consumed.
SP of reference air compressor is conservatively set as a default value in the following manner
to ensure the net emission reductions.
1. The most efficient value is selected for each motor power of air compressors from thecollected SP values available in Thai market and determined as the reference SP.

2. The value of SP is defined as SPRE,sc,i described in Section I.

F.2. Calculation of reference emissionsRE୮‫܀‬۳‫ = ܘ‬෍൛۳۱‫۾‬۸,ܑ,‫ × ܘ‬൫‫܀۾܁‬۳,ୱୡ,ܑ ÷ ‫۾۾܁‬۸,‫܋ܛ‬,ܑ ൯ × ۳۴‫ ܋܍ܔ܍‬ൟܑ: Reference emissions during the period p [tCO2/p]EC୔୎,୧,୮ : Power consumption of project air compressor i during the period p [MWh/p]SP୔୎,ୱୡ,୧ : SP of project air compressor i calculated under the specific conditions [kW·min/m3]
SPୖ୉,ୱୡ,୧ : SP of reference air compressor i under the specific conditions [kW·min/m3]EFୣ୪ୣୡ : CO2 emission factor for consumed electricity [tCO2/MWh]

G. Calculation of project emissionsPE୮‫۾‬۳‫ = ܘ‬෍൫۳۱‫۾‬۸,ܑ,‫ × ܘ‬۳۴‫ ܋܍ܔ܍‬൯ܑ: Project emissions during the period p [tCO2/p]EC୔୎,୧,୮ : Power consumption of project air compressor i during the period p [MWh/p]EFୣ୪ୣୡ : CO2 emission factor for consumed electricity [tCO2/MWh]

H. Calculation of emissions reductions

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JCM_TH_AM002_ver021.0
Sectoral scope: 03ER ୮RE୮PE୮۳‫܀ = ܘ ܀‬۳‫ ܘ‬− ‫۾‬۳‫ܘ‬: Emission reductions during the period p [tCO2/p]: Reference emissions during the period p [tCO2/p]: 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 dataEFୣ୪ୣୡCO2 emission factor for consumed electricity.

Source[Grid electricity]

When project air compressor consumes only The most recent value available
grid electricity or captive electricity, the at the time of validation isproject participant applies the CO2 emission applied and fixed for thefactor respectively.

monitoring period thereafter.
The data is sourced from “GridWhen project air compressor may consume Emission

Factor(GEF)ofboth grid electricity and captive electricity, the Thailand”,endorsedbyproject participant applies the CO2 emission Thailand

GreenhouseGas

factor with lower value.

ManagementOrganization

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)
CDM approved small scale

For captive electricity, it is determined based

methodology: AMS-I.A

on the following options:
For the option b)a) 0.8*Specification of the captive*The most recent value available from CDM

power

approved small scale methodology AMS-I.A

provided by the manufacturer

at the time of validation is applied.

(ηelec [%]).

generation

systemCO2 emission factor of theab) Calculated from its power generation

fossil fuel type used in theefficiency (ηelec [%]) obtained fromcaptive

manufacturer’s specification

system (EFfuel [tCO2/GJ])
4

power

generation

JCM_TH_AM002_ver021.0
Sectoral scope: 03
The power generation efficiency based onlower heating value (LHV) of the captive

For the option bc)

power generation system from theGenerated

manufacturer’s specification is applied;electricity by the captive powerEFୣ୪ୣୡ = 3.6 ×

100× EF୤୳ୣ୪ηୣ୪ୣୡandgeneration

suppliedsystem(EGPJ,p[MWh/p]).
Fuel amount consumed by thebc) Calculated from measured data

captive

powergeneration

The power generation efficiency calculatedsystem(FCPJ,p[massfrom monitored data of the amount of fuelweight/p]).

input for power generation (FC୔୎,୮) and theNet calorific value (NCVfuelthe monitoring period p is applied. The

emission factor of the fuelmeasurement is conducted with the monitoring(EFfuel [tCO2/GJ]) in order of

equipment to which calibration certificate ispreference:

issued by an entity accredited under

1) values provided by the fuelnational/international standards;

supplier;

oramount of electricity generated (EG୔୎,୮ ) during [GJ/mass or weight]) and CO2

EFୣ୪ୣୡ = FC୔୎,୮ × NCV୤୳ୣ୪ × EF୤୳ୣ୪ ×Where:

1EG୔୎,୮

2) measurement by the project
participants;
3) regional or national default

NCV୤୳ୣ୪ : Net calorific value of consumed fuel values;[GJ/mass or weight]

4) IPCC default values
provided in tables 1.2 and 1.4

Note:of Ch.1 Vol.2 of 2006 IPCC

In case the captive electricity generation

Guidelines on National GHG

system meets all of the following conditions,Inventories. Lower value isthe value in the following table may beapplied.

applied to EFelec depending on the consumed
fuel type.

[Captive electricity with dieselfuel]The system is non-renewable generation

CDM approved small scale

systemmethodology: AMS-I.A.

Electricity generation capacity of thesystem is less than or equal to 15 MW[Captive electricity with naturalgas]

fuel type

DieselfuelNatural gas

2006 IPCC Guidelines on
National GHG Inventories for5

JCM_TH_AM002_ver021.0
Sectoral scope: 03EFୣ୪ୣୡ

0.8 *10.46 *2

the source of EF of natural gas.
CDM Methodological tool
"Determining the baseline*1 The most recent value at the time ofefficiency of thermal or electric

validation is applied.
*2 The value is calculated with the equation inthe option a) above. The lower value of default
effective CO2 emission factor for natural gas(0.0543 tCO2/GJ), and the most efficient valueenergy generation systems
version02.0" for the default
efficiency for off-grid power
plants.

of default efficiency for off-grid gas turbine
systems (42%) are applied.
SPୖ୉,ୱୡ,୧

The SP of the reference air compressor i for Specifications of project air
each motor power is set as a default value in compressor i prepared for thethis methodology as shown in the table below.

quotation or factory acceptancetest data by manufacturer.

Motor Power [kW]Reference SP55

5.73

The default SP value is derived

75

6.00

from the result of survey on SP110

5.67

of132

5.84

compressors

145

6.14

manufacturers that have high

160

5.65

market share in Thailand.

200

5.49

non-inverter oil-free air
fromThe SPRE,sc,i is revised if
It is noted that the SP value is calculated undernecessary from survey result

the specific conditions

which is conducted by JC or
project participants every threeyears.

SP୔୎,୧SP of project air compressor i under theSpecifications of project air

project specific conditions.

compressor i prepared for thequotation or factory acceptancetest data by manufacturer.

SP୔୎,ୱୡ,୧

SP of project air compressor i under theSpecifications of project airspecific conditions is calculated by thecompressor i prepared for thefollowing equation:

quotation or factory acceptancetest data by manufacturer.

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JCM_TH_AM002_ver021.0
Sectoral scope: 03௞ିଵܶ௦,௉௃,௦௖,௜
ܲௗ,௉௃,௦௖,௜ ௠೔௞ܵܲ௉௃,௦ୡ,௜ = SP௉௃,௜ ×× ቎ቆቇ− 1቏
ܶ௦,௉௃,௜
ܲ௦,௉௃,௦௖,௜௞ିଵܲௗ,௉௃,௜ + 0.101 ௠೔ ௞÷ ቎ቆቇ− 1቏ܲ௦,௉௃,௜

݇: Heat capacity ratio (Dried Air) = 1.4

݉௜ : Number of compression stages of project aircompressor iܲ௦,௉௃,௜ : Suction pressure of project air compressor i under

the project specific conditions [MPa(abs)] (Default value
is set at atmospheric pressure = 0.101[MPa(abs)])
ܲ௦,௉௃,௦ୡ,௜ : Suction pressure of project air compressor iunder the specific conditions [MPa(abs)] (Default value

is set at atmospheric pressure = 0.101[MPa(abs)])
ܶ௦,௉௃,௜ : Suction temperature of project air compressor iunder the project specific conditions [K] (Value from theproduct catalogue or manufacturer’s specification)
ܶ௦,௉௃,௦௖,௜ : Suction temperature of project air compressor iunder the specific conditions [K] (Default value is set at293.0[K])ܲௗ,௉௃,௜ : Discharge pressure of project air compressor iunder the project specific conditions [MPa(Gaugepressure)] (Value from the product catalogue or
manufacturer’s specification)

ܲௗ,௉௃,௦ୡ,௜ : Discharge pressure of project air compressor iunder the specific conditions [MPa(abs)] (=0.101[MPa(abs)] + 0.7 [MPa(Gauge pressure)] =0.801[MPa(abs)])

History of the document
Version
1.0Date23 August 2016

2.0

1 August 2017

Contents revised
Decision by the Joint Committee.
Initial approval.
•Modifications to add conditions to apply 0.8 or 0.47 as a
CO2 emission factor for captive electricity

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