L 290/414
EN
Official Journal of the European Union
10.11.2022
If the ethane conversion efficiency of the NMC is 0.98 or above, EE shall be set to 1 for any subsequent calculation.
3.2.1.1.3.4.
If the methane FID is calibrated through the cutter, EM shall be 0.
The equation to calculate CCH4 in paragraph 3.2.1.1.3.2. (case (b)) in this annex becomes: CCH4 = CHC(w/NMC) The equation to calculate CNMHC in paragraph 3.2.1.1.3.2. (case (b)) in this annex becomes: CNMHC = CHC(w/oNMC) – CHC(w/NMC) × rh The density used for NMHC mass calculations shall be equal to that of total hydrocarbons at 273.15 K (0 °C) and 101.325 kPa and is fuel-dependent.
3.2.1.1.4.
Flow-weighted arithmetic average concentration calculation The following calculation method shall be applied for CVS systems that are not equipped with a heat exchanger or for CVS systems with a heat exchanger that does not comply with paragraph 3.3.5.1. of Annex B5.
This flow weighted arithmetic average concentration calculation shall be used for all continuous diluted measurements including PN.
It may be optionally applied for CVS systems with a heat exchanger that complies with paragraph 3.3.5.1 of Annex B5.
Ce ¼
Pn
i¼1
qvcvs ðiÞ Ü Δt Ü CðiÞ V
where:
3.2.1.2.
Ce
is the flow-weighted arithmetic average concentration;
qVCVS(i)
is the CVS flow rate at time t = i × Δt, m3/sec;
C(i)
is the concentration at time t = i × Δt, ppm;
Δt
sampling interval, s;
V
total CVS volume, m3;
n
is the test time, s.
Calculation of the NOx humidity correction factor In order to correct the influence of humidity on the results of oxides of nitrogen, the following calculations apply:
KH ¼
1 1 Ä 0:0329 Ü ðH Ä 10:71Þ
where:
H¼
6:211 Ü Ra Ü Pd PB Ä Pd Ü Ra Ü 10Ä2
and: H
is the specific humidity, grams of water vapour per kilogram dry air;
R2
is the relative humidity of the ambient air, per cent;
Pd
is the saturation vapour pressure at ambient temperature, kPa;
PB
is the atmospheric pressure in the room, kPa.