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Joint Crediting Mechanism Approved Methodology VN_AM002“Introduction of room air conditioners equipped with inverters”
A. Title of the methodology
Introduction of room air conditioners equipped with inverters, Version 01.10

B. Terms and definitions
Terms

Definitions

Room air conditioner (RAC)

A single split type air conditioner.

InverterA device included in RACs and other motor-operated
appliances, whose function is to vary the speed of thecompressor motor in line with different load demand, forexample to enable variable refrigerant flow to optimally regulate
the temperature.

Public sector buildings

Buildings owned or administered by national or local
government.

Energy efficiency ratio

The ratio of total cooling capacity to rated input power in(EER)

specified conditions.

Cooling seasonal

Energy efficiency of RACs factoring into the seasonal

performance factor (CSPF)

temperature variation. Ratio of the total annual amount of heatthat the RAC can remove from the indoor air when operated forcooling active mode to the total annual amount of energy
consumed by the equipment during the same period.

C. Summary of the methodology
Items
GHGemission

measuresCalculation
emissions

Summaryreduction Energy saving achieved by introduction of RACs equipped withinverters.

ofreference GHG emissions associated with electricity consumption ofreference RACs are calculated based on the monitored
electricity consumption of project RACs, the ratio of the energy1JCM_VN_AM002_ver01.10
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efficiency of reference and project RACs, and the CO2 emission
factor of the electricity consumed by project RACs.
Calculationofproject GHG emissions associated with electricity consumption ofemissions

project RACs are calculated based on the monitored electricity
consumption of project RACs and the CO2 emission factor ofthe electricity consumed by project RACs.

Monitoring parameters

Electricity consumption of project RACs
Project energy efficiency (CSPF of project RACs)
Reference energy efficiency (CSPF of reference RACs)

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

The methodology is applicable to the following types of projects:
Installation of inverter RACs to public sector buildings.

Replacement of existing non-inverter RACs by inverter RACs in all types ofbuildings.

Criterion 2

Rated cooling capacity of a project RAC is within the applicable range of theVietnamese national standard TCVN7831:2012.

Criterion 3

Ozone Depletion Potential (ODP) of the refrigerant used for project RAC is zero.

Criterion 4

Plans to prevent release of refrigerants into the atmosphere at the time of RAC
removal are prepared for both project RACs and the existing RACs replaced bythe project. In the case of replacing existing RACs by project RACs, executionof the prevention plan is checked at the time of verification, in order to confirm
that refrigerant used for the existing RACs removed by the project is not released
to the air.

E. Emission Sources and GHG types
Reference emissions
Emission sources

GHG types

Electricity consumption by reference RACs

CO2

Project emissions
Emission sources

GHG types

Electricity consumption by project RACs

CO22

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F. Establishment and calculation of reference emissions
F.1. Establishment of reference emissions
Reference emissions are established as the product of monitored electricity consumption ofproject RACs, the ratio of the energy efficiency of reference and project RACs, and the CO2emission factor of the electricity consumed by project RACs.
The methodology provides following stepwise procedures to set energy efficiency values of thereference and project RACs, ex-post. In the procedures, reference RACs are conservatively set
to results in a net reduction of emissions.
Step 1: Determine reference RACs that lead to net emission reduction
Select a reference RAC for each model of project RAC which meets the following conditions:Not equipped with inverters.

Categorized as Grade 4 of the energy efficiency grades by EER as outlined in Table 3 ofVietnamese national standard TCVN7830:2012.

Cooling capacity of the reference RAC selected for the purpose of calculating reference
emissions belongs to the same rated capacity class as the project RAC, based on the three
rated capacity classes in Table 3 of TCVN7830:2012.

Reference RAC is previously unused and is currently available in the market at the time ofCSPF determination.

Step 2: Determine CSPF of reference RACs
CSPF values of selected reference RACs by step 1 are determined at a third party testing facility
which is equipped with a calorimeter capable of determining CSPF in line with ISO5151,
following the testing procedures and conditions outlined in the latest version of Vietnamese
National Standard TCVN 7831 at the time of CSPF determination.
Step 3: Determine CSPF of project RACs
CSPF values of each model type of project RACs are determined at a third party testing facility
which is equipped with a calorimeter capable of determining CSPF in line with ISO5151,
following the testing procedures and conditions outlined in the latest version of Vietnamese
National Standard TCVN 7831 at the time of CSPF determination.
Step 4: Select the reference and project energy efficiency (CSPF) values for the project3

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Among the CSPF values calculated in Step 2 and 3, select the highest value of CSPF determinedaccording to step 2 and the lowest value of CSPF determined according to step 3 to yield theefficiency ratio (hPJ / ηREF in equation 1). These values are used as the reference and project
CSPF values during the project lifetime. This step ensures that ratio of CSPF values used for thepurpose of calculating reference emissions is conservatively derived for the project.
F.2. Calculation of reference emissionsnæh ö
REp = å ECPJ ,i , p ´çç PJ ÷÷ ´ EFeleci =1
è hREF ø(1)WhereREp= Reference emissions during the period p [tCO2/p]

ECPJ,i,p= Electricity consumption by project RACs group i during the period p[MWh/p]n= Number of RACs groups whose aggregate electricity consumption aremeasured by one electricity meter [dimensionless]

12i= An index variable that is used to count the number of RACs groups

hREF= Highest energy efficiency (CSPF) of reference RACs1 [dimensionless]

hPJ= Lowest energy efficiency (CSPF) of project RACs2 [dimensionless]EFelec= CO2 emission factor of electricity consumed [tCO2/MWh]

CSPF of the reference RAC selected using steps as stipulated in Section F.1.
CSPF of the project RAC selected using steps as stipulated in Section F.1.

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G. Calculation of project emissions

nPEp = å ECPJ ,i , p ´ EFeleci =1(2)

Where
PEp

=

Project emissions during the period p [tCO2/p]

ECPJ,i,p=Electricity consumption by project RACs group i during the period p[MWh/p]

EFelec=CO2 emission factor of electricity consumed [tCO2/MWh]

H. Calculation of emissions reductions

ER p = RE p - PE p

(3)

Where
ERp

=Emission reductions during the period p [tCO2/p]

REp=

Reference emissions during the period p [tCO2/p]

PEp=

Project emissions during the period p [tCO2/p]5

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I. Data and parameters fixed ex ante
Parameter
EFelecDescription of data

SourceCO2 emission factor of electricity consumed.

[Grid electricityEFgrid]
Ministry of Natural Resources

When project RACs consume only grid and Environment of Vietnam
electricity or captive electricity, the project (MONRE), Vietnamese DNA for
participant applies the CO2 emission factor CDM
respectively.

unlessinstructed

otherwisebytheJoint

thecaptiveCommittee.
When project RACs may consume both gridelectricity and captive electricity, the project [Captive electricity]
participant applies the CO2 emission factor with For the option a)lower value.

Specification
power[CO2 emission factor]

ofgeneration

systemprovided by the manufacturer

For grid electricity: The most recent value (ηelec,CG [%]).
available from the source stated in this table at CO2 emission factor of the fossil
the time of validationfuel type used in the captivepower

For captive electricity, it is determined based ongeneration

system(EFfuel,CG [tCO2/GJ])

the following options:
For the option b)a) Calculated from its power generation

Generated

efficiency (ηelec,CG [%]) obtained fromelectricity by the captive power

manufacturer’s specification

generation

The power generation efficiency based on[MWh/p]).

lower heating value (LHV) of the captive

Fuel amount consumed by thepower generation system from thecaptive power generation systemmanufacturer’s specification is applied;(FCPJ,CG,p [mass or volume/p]).

EFୣ୪ୣୡ = 3.6 ×100

ηୣ୪ୣୡ,େୋ

× EF୤୳ୣ୪,େୋ

andsystem

supplied(EGPJ,CG,pNet calorific value (NCVfuel,CG[GJ/mass or volume]) and CO2
emissionfactor(EFfuel,CGb) Calculated from measured data[tCO2/GJ]) of the fuel consumedThe power generation efficiency calculatedby the captive power generationfrom monitored data of the amount of fuel input

system in order of preference:for power generation (FCPJ,CG,p) and the amount

1) values provided by the fuel6

JCM_VN_AM002_ver01.10
Sectoral scope: 03of electricity generated (EGPJ,CG,p) during thesupplier;monitoring period p is applied. The2) measurement by the projectmeasurement is conducted with the monitoring

participants;

equipment to which calibration certificate is3) regional or national default

issued by an entity accredited undervalues;

national/international standards;

4) IPCC default values provided

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

×1EG୔୎,େୋ,୮

in tables 1.2 and 1.4 of Ch.1
Vol.2 of 2006 IPCC Guidelines
on National GHG Inventories.
Lower value is applied.

NCVfuel,CG: Net calorific value of fuelconsumed by the captive power generation[Captive electricity with diesel

system [GJ/mass or volume]

fuel]
CDM approved small scaleNote:methodology: AMS-I.A.

In case the captive electricity generation systemmeets all of the following conditions, the value[Captive electricity with naturalin the following table may be applied to EFelecgas]

depending on the consumed fuel type.

2006 IPCC Guidelines on
National GHG Inventories for

The system is non-renewable generation

the source of EF of natural gas.

system

CDM

Electricity generation capacity of the"Determining

system is less than or equal to 15 MW

efficiency of thermal or electricenergyfuel typeEFୣ୪ୣୡ

Dieselfuel
0.8 *1Natural gas
0.46 *2

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 valueof default efficiency for off-grid gas turbine

7

thegeneration

version02.0"

fortoolbaselinesystemsthedefault

efficiency for off-grid power
plants.[EFcaptive]
CDM*1 The most recent value at the time ofMethodologicalapproved

small

methodology: AMS-I.A

scale

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systems (42%) are applied.When captive power
generation is not available at the project site,then the most recent Vietnamese national gridemission factor [EFgrid] available at the time ofvalidation is applied as [EFelec] and fixed for themonitoring period thereafter.
When captive power generation is available atthe project site, then [EFelec] is conservatively
selected as below and fixed for the monitoring
period thereafter:
EFelec = min(EFgrid, EFcaptive)
EFcaptive = 0.8 tCO2/MWh**The most recent emission factor available
from CDM approved small scale methodology
AMS-I.A at the time of validation is applied.
nNumber of RACs groups whose aggregate The project proponent selects anelectricity consumption are measured by one integer between 1 and 25 in line
electricity meter [dimensionless]with the number of RACs groups
included in the project.

History of the document
Version
01.1

Date
10 October 201701.0

14 January 2015

Contents revised
JC6
 Revision of methods to determine CO2 emission factor
for consumed electricity in section I
JC3, Annex 3
Initial approval.

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