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How is the m3/h air flow meter calculated?
1. Nm3/h refers to standard cubic meters per hour. N represents the nominal condition, where the air conditions are: one standard atmosphere, 0 ° C temperature, and 0% relative humidity.
(1) Nm3/h is usually called He Lu standard cubic meter, which is the displacement under standard conditions.
(2) m3/h is the flow rate at working temperature and working pressure. Secondly, based on the ideal gas state equation, calculate the ratio of a certain amount of gas under operating conditions and standard conditions to obtain the ratio of Nm3 to m3. Assuming a certain quality, according to PV/T=constant C, P1V1/T1=P2V2/T2, label 1 is the standard condition, and 2 is the operating condition, V1/V2 can be calculated. This ratio is the ratio of Nm3 to m3. In the case of a constant ideal gas quantity (mass or number of moles), PV/T=nR=C, where P is the pressure, V is the volume, T is the thermodynamic temperature (Kelvin), n is the number of moles, R is the ideal gas constant, and C represents the constant. It can be calculated based on the working hours PV/T=nR=C. Additional information: The standard cubic meter is a unit of measurement for gas flow meters, often referred to as a pseudo mass unit because it appears to be a volume unit but is actually a mass unit. It has no relationship with the pressure or temperature at the location of use, so it is generally used in the chemical industry to calculate the molar or mass of gases involved in chemical reactions. In the standard state, the pressure is the standard atmospheric pressure, which is 101.325 kPa, both domestically and internationally. However, the temperature of the liquid is not the same. In China,
2. What are the symptoms of a broken air flow meter?
The signal of the air flow meter is the core data of the engine electronic control system. Once the sensor malfunctions, it will have a significant impact on the normal operation of the engine. The fault indicator light of the car will light up, and the engine will experience idle shaking, poor acceleration, stall after starting, and other situations. Due to the development of industry in China, there have been many changes in the types of air flow meters for various working conditions. According to the development of the times, air flow meters can be divided into four types: L-type, D-type, hot wire type, and hot film type. The first generation L-type air flow meter has the simplest structure. Of course, there are no models currently in use. The second type is the D-type air flow meter, which is an upgraded version of the first generation air flow meter and can improve the performance of the air flow meter. The third type is the widely used hot wire air flow meter. The biggest feature is the use of the characteristics of thermistors to maintain a constant temperature of the hot wire, thereby ensuring stable accuracy in measuring intake air. The structure and working principle of the hot film air flow meter are similar to those of the hot wire flow meter, mainly to improve the disadvantage of the hot wire becoming dirty (causing inaccurate measure
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