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Division 2.2.4.1 PDP-CVS system

United Kingdom

Original text. Later amendments are not shown.

The mass of the diluted exhaust gas [kg/test] over the cycle shall be calculated by means of equation (7-35), if the temperature of the diluted exhaust gas m ed is kept within ± 6 K over the cycle by using a heat exchanger:

m ed = 1,293 × V 0 × n P × P p 101,325 × 273,15 T (7-35)

where:

V 0

  • volume of gas pumped per revolution under test conditions [m3/rev]

    • n P

  • total revolutions of pump per test [rev/test]

    • p p

  • absolute pressure at pump inlet [kPa]

    • T –

  • average temperature of the diluted exhaust gas at pump inlet [K]

    • 1,293 kg/m3

  • air density at 273,15 K and 101,325 kPa

    • If a system with flow compensation is used (i.e. without heat exchanger), the mass of the diluted exhaust gas m ed, i [kg] during the time interval shall be calculated by means of equation (7-36):

    m ed, i = 1,293 × V 0 × n P, i × p p 101,325 × 273,15 T (7-36)

    where:

    V 0

  • volume of gas pumped per revolution under test conditions [m3/rev]

    • p p

  • absolute pressure at pump inlet [kPa]

    • n P, i

  • total revolutions of pump per time interval i [rev/Δt]

    • T –

  • average temperature of the diluted exhaust gas at pump inlet [K]

    • 1,293 kg/m3

  • air density at 273,15 K and 101,325 kPa