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Joint Crediting Mechanism Approved Methodology VN_AM015“Installation of compressor control system(s) for split type air conditioner(s)”A. Title of the methodology
Installation of compressor control system(s) for split type air conditioner(s), Version 01.0

B. Terms and definitions
Terms

Definitions

Compressor control system(s)A system that improves operation efficiency of split type air
conditioners by preventing excessive cooling through theutilization of pre-programmed switching on/off schedules ofcompressors. The pre-programmed switching on/off
schedules of compressors constantly monitors operation
status of the compressor equipped in the air conditioner
outdoor unit by measuring an electric current at theoptimum programmed timing.

Split type air conditioner(s)A type of air conditioner(s) allows one outdoor unit to beconnected with a wide variety of indoor units, including
wall mounted, consoles, cassette, and ducted units.

Energy saving factor

Energy saving rate realized through pre-programmed
switching on/off schedules by installing compressor control
system for split type air conditioner(s)C. Summary of the methodology
Items

Summary

GHG emission reduction Energy saving achieved by compressor control system(s) formeasures
Calculation
emissionssplit type air conditioner(s).
ofreference Reference emissions are calculated based on the monitored
electricity consumption of compressor of outdoor unit in project
split type air conditioner(s) with compressor control system(s),the project energy saving factor, and the CO2 emission factor of1

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the electricity consumed by project split type air conditioner(s).
Calculationofproject Project emissions are calculated based on the monitoredemissions

electricity consumption of compressor of outdoor unit in project
split type air conditioner(s) with compressor control system(s)and the CO2 emission factor of the electricity consumed byproject split type air conditioner(s).

Monitoring parameters

Electricity consumption of compressor of outdoor unit in project
split type air conditioner(s) with installation of compressor
control system(s)D. Eligibility criteria
This methodology is applicable to projects that satisfy all of the following criteria.
Criterion 1

The project installs compressor control system(s) for new and/or existing noninverter split type air conditioners utilizing electric heat pump.

Criterion 2

The compressor control system(s) has a function to measure electric current ofcompressor(s) at the sampling rate of 0.01 seconds or below and to estimate
the amount of electricity consumption of compressor(s) in non-inverter split
type air conditioner system(s).

E. Emission Sources and GHG types
Reference emissions
Emission sources

GHG types

Electricity consumption by compressor of outdoor unit in new and/or CO2
existing non-inverter split type air conditioner(s) without compressor
control system
Project emissions
Emission sources

GHG types

Electricity consumption of compressor of outdoor unit in project split
type air conditioner(s) with compressor control system(s)F. Establishment and calculation of reference emissions
F.1. Establishment of reference emissions

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Reference emissions are established based on the monitored electricity consumption ofcompressor of outdoor unit in project split type air conditioners, the project energy saving
factor, and the CO2 emission factor of the electricity consumed by project split type airconditioners.
The project energy saving factor by installation of the compressor control system(s) isdetermined by the following procedures to ensure net emission reductions.
Step 1: Once after the installation of the compressor control system(s) in the project activity,
switch the compressor control system(s) on(activate) and off(inactivate) consecutively at the30-minute interval at pre-programmed switching on/off schedules before starting monitoring
period. Secondly take continuous measurements on electricity consumption of compressors in
the air conditioners for both on and off cases at an interval of at least 0.01 second by internalfunctions of compressor control system(s) for at least one operating day.
Step 2: Collect measured electricity consumption data by all installed compressor controlsystem(s) during period examined. All the data is aggregated to total electricity consumption
for both on and off cases, respectively per installed compressor control system(s).
Note:
In case the number of the installed compressor control system(s) exceeds 10 units, random
sampling may be conducted. The sample size can be determined in line with the latest version
of “Guideline Sampling and surveys for CDM project activities and programmes of activities”
and “Standard Sampling and surveys for CDM project activities and programmes of activities”
applicable at the time of conducting the sampling. Simple random sampling can be utilized if
areas where the compressor control systems are installed belong to the same region describedin explanatory note 1, and if the same pre-programmed on/off switching schedules are applied
to all compressor control systems installed.
Step 3: Compare electricity consumption data of all collected or sampled compressor control
systems(s) for on and off cases and calculate the percentage of electricity consumption saved
expressed as calculated energy saving factor of each data or sample. Calculate the energy
saving factor as follows.
ߟ௝,௣௘ = ൫‫ܥܧ‬௉௃,௦௬௦,௢௙௙,௝,௣௘ − ‫ܥܧ‬௉௃,௦௬௦,௢௡,௝,௣௘ ൯ ÷ ‫ܥܧ‬௉௃,௦௬௦,௢௙௙,௝,௣௘
3

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j:An index variable that is used to count the number of all or sampled
compressor control system(s) which is installed to split type air
conditioner(s) for determination of calculated energy saving factor.

ηj,pe:

Calculated energy saving factor determined by the compressor controlsystem j which is installed to the split type air conditioner during theperiod examined pe [-]ECPJ,sys,on,j,pe:Electricity consumption of compressor measured by the compressor
control system j which is installed to the project split type air conditioner
with activating compressor energy saving control during the period
examined pe [MWh/pe]

ECPJ,sys,off,j,pe:Electricity consumption of compressor measured by the compressor
control system j which is installed to the project split type air conditioner
with inactivating compressor energy saving control system during theperiod examined pe [MWh/pe]

Step 4: Determine the project energy saving factor with (1) averaged energy saving factor(defined as have) which is derived by averaging the calculated energy saving factor(s) and (2)standard deviation (defined as σ) by every energy saving factor of split type air conditioner j.
Project energy saving factor h is set as follows by subtracting standard deviation (σ) fromaveraged energy saving factor (have) to ensure net emission reductions.

h = h ave − σWhere,

have =1
åηj , pej j

In case of using all data,s =1
å (ηj , pe -h ave ) 2
j j

s =1å (ηj, pe -h ave )2j -1 j

In case of using sampled data,have:

Averaged energy saving factor of compressor in split type airconditioner(s) [-]σ:Standard deviation of energy saving factor of compressor in split type air
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conditioner(s) [-]h:

Project energy saving factor [-]F.2. Calculation of reference emissions

REp = å ECPJ ,i , p ¸ (1 -η) ´ EFeleci =1

WhereREp:

Reference emissions during the period p [tCO2/p]

ECPJ,i,p:Electricity consumption of compressor of outdoor unit in project split
type air conditioner(s) i which is installed compressor control system(s)during the period p [MWh/p]i:

An index variable that is used to count the number of all project split typeair conditioner(s) which is installed compressor control system(s)h:Project energy saving factor [-]EFelec:CO2 emission factor of consumed electricity [tCO2/MWh]

G. Calculation of project emissions

ࡼࡱ࢖ = ෍ ࡱ࡯ࡼࡶ,࢏,࢖ × ࡱࡲࢋ࢒ࢋࢉ࢏ୀ૚

WherePEp:

Project emissions during the period p [tCO2/p]

ECPJ,i,p:Electricity consumption of compressor of outdoor unit in project split
type air conditioner(s) i which is installed compressor control system(s)during the period p [MWh/p]

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

H. Calculation of emissions reductions

ER p = RE p - PE p5

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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]

I. Data and parameters fixed ex ante
The source of each data and parameter fixed ex ante is listed as below.
Parameter
EFelecDescription of data
CO2 emission factor of consumed electricity.

Source[Grid electricity]
Ministry

When project compressor of outdoor unitof

NaturalResources and Environment

consume only grid electricity or captive ofVietnam(MONRE),

electricity, the project participant applies the Vietnamese DNA for CDM
CO2 emission factor respectively.

unless otherwise instructedby the Joint Committee.

When project compressor of outdoor unit may
consume both grid electricity and captive [Captive electricity]
electricity, the project participant applies the For the option a)
CO2 emission factor with lower value.

Specification of the captivepower[CO2 emission factor]

generation

systembytheprovided

For grid electricity: The most recent value manufacturer (ηelec,CG [%]).
available from the source stated in this table at CO2 emission factor of thethe time of validation

fossil fuel type used in thecaptive power

For captive electricity, it is determined based

generation

system (EFfuel,CG [tCO2/GJ])

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

Generated

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

manufacturer’s specification

power

The power generation efficiency based on(EGPJ,CG,p [MWh/p]).

lower heating value (LHV) of the captive

Fuel amount consumed bypower generation system from thethe captive power generation

manufacturer’s specification is applied;

system (FCPJ,CG,p [mass orsuppliedgeneration

volume/p]).
6andsystem

JCM_VN_AM015_ver01.0
Sectoral scope: 03EFୣ୪ୣୡ = 3.6 ×100

ηୣ୪ୣୡ,େୋ× EF୤୳ୣ୪,େୋ

Net

calorific(NCVfuel,CGvalue[GJ/massorvolume]) and CO2 emissionb) Calculated from measured data

factor (EFfuel,CG [tCO2/GJ])The power generation efficiency calculatedof the fuel consumed by thefrom monitored data of the amount of fuelcaptive powergeneration

input for power generation (FCPJ,CG,p) and thesystem

orderamount of electricity generated (EGPJ,CG,p)preference:

during the monitoring period p is applied. The

1) values provided by themeasurement is conducted with the monitoring

fuel supplier;

equipment to which calibration certificate is2) measurement by theissued by an entity accredited underproject participants;

national/international standards;

3) regional or nationalEFୣ୪ୣୡ = FC୔୎,େୋ,୮ × NCV୤୳ୣ୪,େୋ × EF୤୳ୣ୪,େୋ

default values;

Where:

×1EG୔୎,େୋ,୮

inof

4) IPCC default values
provided in tables 1.2 and1.4 of Ch.1 Vol.2 of 2006

NCVfuel,CG: Net calorific value of fuel

IPCC Guidelines on

consumed by the captive power generation

National GHG Inventories.

system [GJ/mass or volume]

Lower value is applied.

Note:[Captive electricity withIn case the captive electricity generation

diesel fuel]system meets all of the following conditions,CDM approved small scale

the value in the following table may be

methodology: AMS-I.A.

applied to EFelec depending on the consumed
fuel type.

[Captive electricity withnatural gas]The system is non-renewable generation

2006 IPCC Guidelines onsystem

National GHG Inventories

Electricity generation capacity of thefor the source of EF ofsystem is less than or equal to 15 MW

natural gas.
CDM Methodological tool

fuel typeEFୣ୪ୣୡDiesel
fuel

Natural gas

0.8 *10.46 *2"Determining the baseline
efficiency of thermal orelectric energy generation
systems version02.0" for the7

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default efficiency for off*1 The most recent value at the time ofgrid power plants

validation is applied.
*2 The value is calculated with the equation in
the 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
systems (42%) are applied.

hProject energy saving factor [-]Determined as per theprocedure described inSection F.1

History of the document
Version01.0

Date28 May 2019

Contents revised
JC8, Annex 1
Initial approval.

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JCM_VN_AM015_ver01.0
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The region of Viet Nam is divided into 6 administrative units, Red river delta, Northern
midland mountain area, North central and central coastal area, Central highlands, South east,and Mekong river delta, according to General statistics office of Viet Nam.
http://www.gso.gov.vn/default_en.aspx?tabid=515&idmid=5&ItemID=18533

Source: Map of Viet Nam, Ministry of Land, Infrastructure, Transport and Tourism, JAPANhttp://www.mlit.go.jp/kokudokeikaku/international/spw/general/vietnam/index_e.html

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