Appendix 1

Additional information to the proposed JCM methodology“Introduction of energy efficient wire stranding machines to automotive wire production factory” onsetting default value for ECR

1. Market of wire stranding machines in Vietnam
Hearing survey with the local user, it is found that Company A and Company B have high market share of wire
stranding machines with the flange diameter of bobbin 560 mm in Vietnam. Company B produces an energy
efficient type wire stranding machine which meets the eligibility criteria in this proposed methodology.
Two types of wire stranding machines from Company A are identified, one with normal type bows1 and anotherone with energy efficient type bows. Since initial cost (purchase cost) of wire stranding machine with normal typebows is lower than that of energy efficient type bows, the normal type has higher market share in Vietnam.
Therefore, wire stranding machine with energy efficient type bows is determined as reference machine in thismethodology in a conservative manner.

Table1: Different types of wire stranding machines available in Vietnamese marketCompany ACompany ACompany BCategoryBaUReferenceProjectType of bowNormal

Energy efficient

Energy efficient

Motor capacity[kW]Maximum twisting speed[rpm]2222

113,200

3,200

3,500

2. Determination of the default value for electricity consumption ratio per production unit (ECR)
Electricity consumption ratio per production unit (hereinafter referred to as “ECR”) is a parameter to be used in anequation to calculate reference emissions. By fixing a default value for ECR in a conservative manner ensures net
emission reductions in the proposed methodology.
ECR is a ratio of electricity consumption per production unit of reference wire stranding machine (𝐸𝑃𝑈𝑅𝐸 ) to thatof project machine (𝐸𝑃𝑈𝑃𝐽 ).

𝐸𝐶𝑅 = 𝐸𝑃𝑈𝑅𝐸 ⁄𝐸𝑃𝑈𝑃𝐽
EPUs for three different types of wire stranding machines in Table 1 have been measured multiple times andcollected. Since twisting speed of wire stranding machine has an effect on EPU, EPUs have been measured indifferent twisting speed for the same wire stranding machine type. Data measured multiple times are averaged foreach wire stranding machine type and plotted as shown in Figure 1.

1

Parts of wire stranding machine which twists multiple metal wires together into a stranded wire.
1

3.5
EPU
[kWh/km]BaU

3.0EPU RE

EPU PJ

2.5
2.0
1.5
1.0
0.5

0.00500

1000

1500

2000

2500

3000

3500

twisting speed (rpm)Figure1: Relation between twisting speed (rpm) and EPU
Fourth-order curves have been obtained to approximate the plotted data of EPURE and EPUPJ (see Figure2),respectively. Both curves show very high coefficient of determination (R2=0.9793 for EPURE and R2=0.9684 forEPUPJ), which also shows clear correlation between EPU and twisting speed.
2.0EPU[KWh/km]

EPU REEPU PJ

1.5y = 2E-13x4 - 2E-09x3 + 5E-06x2 - 0.0059x + 3.0625
R² = 0.9793

1.00.5y = 9E-14x4 - 7E-10x3 + 2E-06x2 - 0.0024x + 1.2784
R² = 0.9684
rotation per minute[ｒｐｍ]0.00500

1000

1500

2000

2500

rpm=2800

3000

3500

twisting speed (rpm)Figure2: Approximation of measured data
Table 2 shows ECR values calculated from measured data of EPURE and EPUPJ. The value varies depending on thetwisting speed, and twisting speed may also vary depending on operational conditions.
Therefore, setting the default value of ECR at the minimum value ensures conservativeness and net emission
reductions, which is determined as “1.51” as shown in Table 2.

2

Table2: ECR values
Twisting

500

1000

1500

2000

2500

2700

2750

2800

2850

2900

3000

3200

1.18730.68830.71200.77680.77150.79560.80940.82750.85050.87910.95631.21220.51770.32220.35730.42990.48730.5211

0.53240.54530.56010.57690.61770.7369

2.293

2.136

1.992

1.806

1.583

1.5261.520

1.517

1.518

1.523

1.547

1.645

speed[rpm]EPURE[kW/km]EPUPJ[kWk/m]ECR

Minimum value
for ECR

3