KPI021 | NOx efficiency V2.6

Key Performance Indicator

This KPI expresses the amount of NOx emitted relative to the transport work performed. As the PI Value ’Emitted Mass NOx' is to be given in Kg, the figure is multiplied by 1 thousand to get the KPI value in g/transport work (ton mile, passenger mile, TEU mile, etc). Only the main engine should be accounted for, unless running on diesel (as the diesel engine's powers are distributed where needed and not directly related to the main engine only). In such a case also other machinery should be reported and should consider the NCT reference below.

Unit	g/[Cargo Unit] mile
Scope
Calculation period

Formula

[formula]KPI_{Value} = \frac {PI008} {PI064} \times 10^3[/formula]

PI008	Emitted mass of NOx
PI064	Transport work

Example

A	Emitted mass of NOx:	= 4700000 kg
B	Transport work:	= 20,710,647,000 ton mile
KPI Value	NOx efficiency	[formula]= \frac {A} {B} \times 10^3 = \frac {4700000} {20,710,647,000} \times 10^3 \approx 0.193[/formula]

Rating Formula

[formula] \begin{align} \displaylines { KPI_{Value}\\ KPI_{MinReq} = 2.2\\ KPI_{Target} = 0.9 } \end{align} [/formula] [formula] KPI_{Rating} = 100 \times \frac {KPI_{Value} - KPI_{MinReq}} {KPI_{Target}-KPI_{MinReq}} [/formula]

Rating Example

KPI Value	= 0,193
KPI MinReq	= 2,2
KPI Target	= 0,9
KPI Rating	[formula]=KPI_{Rating} = 100 \times \frac {KPI_{Value} - KPI_{MinReq}} {KPI_{Target}-KPI_{MinReq}} = 100 \times \frac {0,193 - 2,2} {0,9-2,2} = 100[/formula]