Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p22
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 22/56)
Character Range: 356494–359357

for standard conditions,
                  pp is the absolute pressure at venturi inlet, kPa
                  T is the absolute temperature at venturi inlet, K
 If a system with flow compensation is used (i.e. without heat exchanger), the instantaneous mass emissions shall be calculated and integrated over the cycle. In this case, the instantaneous mass of the diluted exhaust gas shall be calculated as follows:
med,i = 1.293 x ti x KV x pp / T 0.5 (52)
 Where:
                  ti is the time interval, s
8.5.1.4. SSV-CVS system
 The calculation of the mass flow over the cycle shall be as follows, if the temperature of the diluted exhaust is kept within ±11 K over the cycle by using a heat exchanger:
med = 1.293 x QSSV (53)
 With
                      (54)
 Where:
                  A0 is 0.005692 in SI units of

                  dV is the diameter of the SSV throat, mm

                  Cd is the discharge coefficient of the SSV
                  pp is the absolute pressure at venturi inlet, kPa
                  T is the temperature at the venturi inlet, K
                  rp is the ratio of the SSV throat to inlet absolute static pressure,
                  rD is the ratio of the SSV throat diameter, d, to the inlet pipe inner diameter D
 If a system with flow compensation is used (i.e. without heat exchanger), the instantaneous mass emissions shall be calculated and integrated over the cycle. In this case, the instantaneous mass of the diluted exhaust gas shall be calculated as follows:
med  =  1.293 x QSSV x ti (55)
 Where:
                  ti is the time interval, s
 The real time calculation shall be initialized with either a reasonable value for Cd, such as 0.98, or a reasonable value of Qssv. If the calculation is initialized with Qssv, the initial value of Qssv shall be used to evaluate the Reynolds number.
 During all emissions tests, the Reynolds number at the SSV throat shall be in the range of Reynolds numbers used to derive the calibration curve developed in paragraph 9.5.4.
8.5.2. Determination of the gaseous components
8.5.2.1. Introduction
 The gaseous components in the diluted exhaust gas emitted by the engine submitted for testing shall be measured by the methods described in Appendix 2 to this annex. Dilution of the exhaust shall be done with filtered ambient air, synthetic air or nitrogen. The flow capacity of the full flow system shall be large enough to completely eliminate water condensation in the dilution and sampling systems. Data evaluation and calculation procedures are described in paragraphs 8.5.2.2. and 8.5.2.3.
8.5.2.2. Data evaluation
 The emission relevant data shall be recorded and stored in accordance with paragraph 7.6.6.
8.5.2.3. Calculation of mass emission
8.5.2.3.1. Systems with constant mass flow
 For systems with heat exchanger, the mass of the pollutants shall