2 Carbon balance method, 1-step calculation procedure
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Statutory Documents - IMO Publications and Documents - International Codes - NOx Technical Code (2008) - Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines - Appendix 6 - Calculation of exhaust gas mass flow (carbon-balance method) - 2 Carbon balance method, 1-step calculation procedure

2 Carbon balance method, 1-step calculation procedure

  2.1 This method involves exhaust mass calculation from fuel consumption, fuel composition and exhaust gas concentrations.

  2.2 Exhaust gas mass flow rate on wet basis:

 with:

  • f fd according to equation (2), f c according to equation (3).

  • H a is the absolute humidity of intake air, in gram water per kg dry air. However if

  • H a ≥ H SC, then H SC shall be used in place of H a in formula (1).

  Note: Ha may be derived from relative humidity measurement, dewpoint measurement, vapour pressure measurement or dry/wet bulb measurement using the generally accepted formulae.

  2.3 The fuel-specific constant f fd for the dry exhaust shall be calculated by adding up the additional volumes of the combustion of the fuel elements:

  2.4 Carbon factor f c according to equation (3):

 with

  • c CO2d = dry CO2 concentration in the raw exhaust, %

  • c CO2ad = dry CO2 concentration in the ambient air, % = 0.03%

  • c COd = dry CO concentration in the raw exhaust, ppm

  • c HCw = wet HC concentration in the raw exhaust, ppm

  2.5 qmf, wALF, wBET, wDEL, wEPS, ffd parameters, in formula (1) shall be calculated as follows:

Factors in formula (1)   Formula of factors
qmf = qmf_G+qmf_L
wALF =
wBET =
wDEL =
wEPS =
Parent topic: Appendix 6 - Calculation of exhaust gas mass flow (carbon-balance method)
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