7 Determination of power set point stability
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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 8 – Implementation of the direct measurement and monitoring method(Refer to 6.4 of the NOx Technical Code 2008) - 7 Determination of power set point stability

7 Determination of power set point stability

  7.1 To determine set point stability, the power coefficient of variance shall be calculated over a 10-minute interval, and the sampling rate shall be at least 1-Hz. The result shall be less than or equal to five per cent (5%).

  7.2 The formulae for calculating the coefficient of variance are as follows:

Where:

  • %C.O.V. power coefficient of variance in %
  • S.D. standard deviation
  • Ave average
  • N total number of data points sampled
  • xi, xj ith, jth value of power data point in kW
  • i index variable in standard deviation formula
  • j index variable in average formula.
Parent topic: Appendix 8 – Implementation of the direct measurement and monitoring method (Refer to 6.4 of the NOx Technical Code 2008)
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