JCM_KH_AM005_ver01.0
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Joint Crediting Mechanism Approved Methodology KH_AM005“Installation of inverters to distribution pumps in water treatment plant”

A. Title of the methodology
Installation of inverters to distribution pumps in water treatment plant, Version 01.0

B. Terms and definitions
Terms

Definitions

inverter

An apparatus to control the motor speed in line withdifferent load demand

electricity consumption ratio(hereinafter referred to as “ECR”)
operational load

The ratio of actual electricity consumption to rated
electricity consumption
The ratio of actual water flow to rated water flow capacityof pump

C. Summary of the methodology
Items
GHG

emission

Summary
reduction Introduction of inverter to constant-speed pumps for watermeasures

distribution in water treatment plant leads to a reduction ofelectricity consumption by pumps and GHG emissions
accordingly.

Calculationofreference Reference emissions are calculated with the monitored

emissionselectricity consumption of project pumps, the ratio of ECR ofreference and project pumps, and the CO2 emission factor forconsumed electricity.

Calculationofproject Project emissions are calculated with the monitored electricity

emissionsconsumption of project pumps and the CO2 emission factor for
consumed electricity.

Monitoring parameters

Electricity consumption of project pumps

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D. Eligibility criteria

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

Inverter(s) is installed to the existing constant-speed pump(s) for water
distribution in water treatment plant.

Criterion 2

The value of ECR of project pump is always smaller than that of reference pumpat the same operational load except when the operational load is equal to one (1),which is demonstrated by equations fixed ex ante or may be demonstrated byequations ex post at the time of the first verification.

E. Emission Sources and GHG types
Reference emissions
Emission sources

GHG types

Electricity consumption by reference pumps

CO2

Project emissions
Emission sources

GHG types

Electricity consumption by project pumps

CO2

F. Establishment and calculation of reference emissions
F.1. Establishment of reference emissions
Reference emissions are calculated with the monitored electricity consumption of projectpumps, the ratio of ECR of reference and project pumps, and the CO2 emission factor forconsumed electricity.
Net emission reductions are ensured by setting an equation to calculate ECR of reference pumpin a conservative manner in this methodology.
1) Electricity consumption and water flow of existing constant-speed pumps are actually
measured at major water treatment plants in Cambodia.
2) Monitored data shows that relatively new pumps consume less electricity than old ones atthe same operational load.
3) Data of new pumps are selected to determine an approximation formula for ECR ofreference pump.

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F.2. Calculation of reference emissions

Whereܴ‫ܧ‬௣‫ܥܧ‬௉௃,௜,௣‫ܴܥܧ‬ோா,௜,௣‫ܴܥܧ‬௉௃,௜,௣‫ܨܧ‬௘௟௘௖iܴ‫ܧ‬௣ = ෍ ቆ‫ܥܧ‬௉௃,௜,௣ ×௜‫ܴܥܧ‬ோா,௜,௣ቇ × ‫ܨܧ‬௘௟௘௖‫ܴܥܧ‬௉௃,௜,௣

Reference emissions during the period p [t-CO2/p]
Electricity consumption by project pump i during the period p [MWh/p]
ECR of reference pump i during the period p [dimensionless]
ECR of project pump i during the period p [dimensionless]
CO2 emission factor for consumed electricity [tCO2/MWh]
Identification number of pumps [dimensionless]‫ܴܥܧ‬ோா,௜,௣ and ‫ܴܥܧ‬௉௃,௜,௣ are determined by the following processes.

Step 1: A cubic equation to calculate ‫ܴܥܧ‬௉௃,௜,௣ for each project pump is fixed ex ante or ex postwith monitored data of the project pump.

Coefficient of determination (R2) of the equation exceeds 0.95.

Monitored data is adjusted so that the value of ECR is one (1) when the operation load factor isone (1) in the cubic equation.
Step 2: ECR of project pump i for the monitoring period (‫ܴܥܧ‬௉௃,௜,௣ ) is calculated frommonitored electricity consumption divided by a rated electricity consumption of the pumpwhich is derived by multiplying a rated input power by monitored hours.
When project pump is stopped due to maintenance, breakdown and so on, those hours are
excluded from the monitored hours.
Step 3: An average operational load of project pump for the monitoring period (x) is derived byapplying the value of ECR calculated in Step 2 to the equation fixed in Step 1.

Step 4: ‫ܴܥܧ‬ோா,௜,௣ is calculated by applying the average operational load of project pumpderived in Step 3 to the following equation.

Wherex‫ܴܥܧ‬ோா,௜,௣ = −0.6703‫ ݔ‬ଷ + 0.8734‫ ݔ‬ଶ + 0.3442‫ ݔ‬+ 0.4484

Operational load of project pump [dimensionless]3

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G. Calculation of project emissions

Whereܲ‫ܧ‬௣‫ܥܧ‬௉௃,௜,௣‫ܨܧ‬௘௟௘௖

iܲ‫ܧ‬௣ = ෍൫‫ܥܧ‬௉௃,௜,௣ × ‫ܨܧ‬௘௟௘௖ ൯௜

Project emissions during the period p [t-CO2/p]
Electricity consumption by project pump i during the period p [MWh/p]
CO2 emission factor for consumed electricity [tCO2/MWh]
Identification number of pumps [dimensionless]

H. Calculation of emissions reductions‫ܴܧ‬௣ = ܴ‫ܧ‬௣ − ܲ‫ܧ‬௣Whereܲ‫ܧ‬௣ܴ‫ܧ‬௣ܲ‫ܧ‬௣Emission reductions during the period p [t-CO2/p]
Reference emissions during the period p [t-CO2/p]
Project emissions during the period p [t-CO2/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 dataSource‫ܴܥܧ‬௉௃,௜,௣

Electricity consumption ratio of project pump

Monitored data or test data ofi during the period ppump manufacturer

A cubic equation to calculate ‫ܴܥܧ‬௉௃,௜,௣ foreach project pump is fixed ex ante with
monitored data of the project pump.
Coefficient of determination (R2) of theequation exceeds 0.95.
A cubic equation is adjusted so that the4

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electricity consumption ratio is one (1) when
the operation load factor is one (1).

‫ܨܧ‬௘௟௘௖* ‫ܴܥܧ‬௉௃,௜,௣ may be fixed ex post.

CO2 emission factor for consumed electricity[Grid electricity]
The most recent published

When project pump consumes only grid value

bytheMinistry ofelectricity or captive electricity, the project Environment of Cambodia atparticipant applies the CO2 emission factor the time of validation.
respectively.
[Captive electricity]
When project pump may consume both grid For the option (a)and captive electricity, the project participant Specification of the captive
applies the CO2 emission factor with lower power
value.

generation

systemprovided by the manufacturer(ηelec,CG [%]).

In case the captive electricity is generated by CO2 emission factor of therenewable energy source(s) and the amount of fossil fuel type used in thethe captive electricity generated by the captive
renewable

source(s)estimated

frompower

generation

its system (EFfuel,CG [tCO2/GJ])

generation capacities is equal to or less thanhalf of the total electricity consumption at the For the option (b)project site, the portion of electricity generated Generated

andsuppliedby the renewable source(s) may be neglected electricity by the captive powerin the calculation of the captive CO2 emission generation system (EGPJ,CG,pfactor. If the amount of captive electricity [MWh/p]).
generated by renewable source(s) is more than Fuel amount consumed by thehalf, the captive CO2 emission factor is captivepower

generation

determined by the following option (b) of “(2) system(FCPJ,CG,p[massorFor captive electricity” using the total amount volume/p]).
of captive electricity generated by both fossil Net calorific value (NCVfuel,CGfuel and renewable sources for EGPJ,CG,p..

[GJ/mass or volume]) and CO2emissionfactor(EFfuel,CG[CO2 emission factor][tCO2/GJ])of(1) For grid electricity

consumed by the captive power

thefuelThe most recent value available from the generation system in order ofsource stated in this table at the time of preference:5

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validation is applied.

1) values provided by the fuelsupplier;(2) For captive electricity2) measurement by the project

Option (a) Calculated from its power

participants;

generation efficiency (ηelec,CG [%]) obtained3) regional or national default

from manufacturer’s specification

values;

The power generation efficiency based on4) IPCC default values

lower heating value (LHV) of the captive

provided in tables 1.2 and 1.4power generation system from theof Ch.1 Vol.2 of 2006 IPCC

manufacturer’s specification is applied;

Guidelines on National GHG

EFୣ୪ୣୡ = 3.6 ×100

ηୣ୪ୣୡ,େୋ

× EF୤୳ୣ୪,େୋInventories. Lower value isapplied.

Option (b) Calculated from measured data

[Captive electricity with diesel

The power generation efficiency calculated

fuel]from monitored data of the amount of fuelCDM approved small scale

input for power generation (FCPJ,CG,p) and themethodology: AMS-I.A.

amount of electricity generated (EGPJ,CG,p)during the monitoring period p is applied.

[Captive electricity withThe measurement is conducted with thenatural gas]monitoring equipment to which calibration

2006 IPCC Guidelines oncertificate is issued by an entity accredited

National GHG Inventories forunder national/international standards;

the source of EF of natural gas.

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

CDM

Where:

×1

EG୔୎,େୋ,୮

Methodological"Determining

thetoolbaseline

efficiency of thermal or electricenergygeneration

systems

NCVfuel,CG: Net calorific value of fuelversion02.0" for the default

consumed by the captive power generation

efficiency for off-grid powersystem [GJ/mass or volume]

plants.

Note:
In case the captive electricity generation
system meets all of the following conditions,the value in the following table may be
applied to EFelec depending on the consumed
fuel type.
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The system is non-renewable generation
systemElectricity generation capacity of thesystem is less than or equal to 15 MW

fuel typeEFୣ୪ୣୡ

Dieselfuel

Natural gas

0.8*1

0.46*2*1 The most recent value at the time ofvalidation is applied.
*2 The value is calculated with the equation in
the option (a) above. The lower value ofdefault effective CO2 emission factor fornatural gas (0.0543 tCO2/GJ), and the mostefficient value of default efficiency foroff-grid gas turbine systems (42%) areapplied.

History of the document
Version01.0

Date
21 February 2020

Contents revised
JC5, Annex 6
Initial approval.

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