Traduction de «chaleur massique à pression constante » (Français → Anglais) :

specific heat capacity at constant pressure

specific heat capacity at constant volume

enthalpy [ H | heat content | total heat ]

continuous-pressure operation power elevator

evaporator pressure regulator [ back pressure regulator | constant pressure valve | back pressure valve | two-temperature valve ]

constant pressure surface | isobaric surface

constant pressure cycle

2.2.1. Determination of the Diluted Exhaust Gas Flow PDP-CVS system The calculation of the mass flow over the cycle, if the temperature of the diluted exhaust is kept within ± 6 K over the cycle by using a heat exchanger, is as follows: M TOTW = 1,293 x V0 x NP x (pB - p1 ) x273 / (101,3 x T) where M TOTW = mass of the diluted exhaust gas on wet basis over the cycle V0 = volume of gas pumped per revolution under test conditions (m³/rev) NP = total revolutions of pump per test pB = atmospheric pressure in the test cell (kPa) p1 = press ...[+++]ure drop below atmospheric at the pump inlet (kPa) T = average temperature of the diluted exhaust gas at pump inlet over the cycle (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: M TOTW ,i = 1,293 x V0 x NP,i x (pB - p1 ) x 273 / (101,3 x T) where NP,i = total revolutions of pump per time interval CFV-CVS system The calculation of the mass flow over the cycle, if the temperature of the diluted exhaust gas is kept within ± 11K over the cycle by using a heat exchanger, is as follows: M TOTW = 1,293 x t x Kv x pA / T where M TOTW = mass of the diluted exhaust gas on wet basis over the cycle t = cycle time (s) KV = calibration coefficient of the critical flow venturi for standard conditions, pA = absolute ...[+++]pressure at venturi inlet (kPa) T = 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.

A0 = collection of constants and units conversions d = diameter of the SSV throat (m) Cd = discharge coefficient of the SSV PA = absolute pressure at venturi inlet (kPa) T = temperature at the 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.

Systems with Constant Mass Flow For systems with heat exchanger, the mass of the pollutants MGAS (g/test) shall be determined from the following equation: MGAS = u x conc x MTOTW where u = ratio between density of the exhaust component and density of diluted exhaust gas, as reported in Table 4, point 2.1.2.1 conc = average background corrected concentrations over the cycle from integration (mandatory for NOx and HC) or bag measurement (ppm) MTOTW = total mass of diluted exhaust gas over the cycle as determined in section 2.2.1 (kg) As the NOx emission depends o ...[+++]n ambient air conditions, the NOx concentration shall be corrected for ambient air humidity with the factor k H , as described in section 2.2.2.