| 摘要 |
A method for determining mass flow of a gas by means of a mass flow meter, which has a first and a second temperature sensor, which can be flowed around by the gas. The first temperature sensor is heated with a heating power Q, wherein the mass flow of the medium is determined by means of a power coefficient PC=Q/&Dgr;T as a function of a heating power Q and a temperature difference &Dgr;Tm=T1−T2 between the measured values of the temperature sensor. A corrected power coefficient PCcorr is determined, wherein at least one correction occurs by means of at least one recovery correction term Ki, wherein the recovery correction term Ki has the form Ki=&Dgr;x·u2/(2·cp), wherein u is the flow velocity and cp the heat capacity of the medium, &Dgr;x is an element of the set {&Dgr;1; &Dgr;2; &Dgr;12}, &Dgr;1:=e1−cr, &Dgr;2:=e2−cr and &Dgr;12:=e1−e2=&Dgr;1−&Dgr;2, e1 and e2 are the recovery factors of the first, respectively second, temperature sensors, and wherein cr is a constant reference value, for which holds cr≦̸1, especially cr=1. |
