KPI021 | NOx efficiency V3.0

Key Performance Indicator

This KPI expresses the amount of NOx emitted relative to the transport work performed.

Interpretation	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). Consumption of fuel in 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).
Notes	The issue of NOx efficiency is complicated by the fact that there are several influencing factors driving the fuel consumption. The commercial operator is responsible for utilization of the ship’s capacity hereby affecting the transport work. The other main factor regarding transport work is the market itself. Ship’s attributes such as hull design, engine type (and to some extent age) as well as the load factor for each voyage are all influencing the NOx efficiency through the amount of fuel burned.
Unit	g/[Cargo Unit] mile
Scope	Ship level
Calculation period	Quarterly

Formula

[formula]KPI021 = \frac {PI008} {PI064} \times 10^3[/formula]

PI008	Emitted mass of NOx
PI064	Transport work

Example

PI008	Emitted mass of NOx	= 4700000 kg
PI064	Transport work	= 20,710,647,000 ton mile
KPI Value	NOx efficiency	= 0.193

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]