Using a pitot tube at stp plus#
Using a pitot tube at stp download#

Measuring the compressed air flow rate in industrial facilities can help determine when and where compressed air is used, identify wastage, and thus improve operational efficiency. For more information on combustion efficiency, see the Sage white paper, вЂњ Combustion Efficiency and Thermal Mass Flow Meters.вЂќ Compressed Air Flow Meters Alternatively, too much airflow means that the excess heated air releases into the atmosphere.

Using a pitot tube at stp plus#

If there is too little air, incomplete combustion occurs, which results in lower combustion efficiency plus emitting unburnt fuel into the atmosphere. The air-fuel ratio is the mass ratio of air to fuel present. The most efficient combustion occurs with an optimum amount of each. Combustion Air FlowД¬ombustion is the burning of air and fuel. More often, the flow rate over a specific time is desired, such as SCFM (standard cubic feet per minute) or pounds per hour. In this case, the measurements can be in units of SCF (standard cubic feet), pounds, kilograms, or regular cubic meters. In one case, the flow is indicated by the total flow since the previous reading. There are two ways of measuring and reporting airflow.

Flow measurements at STP conditions are mass flow since they refer to specific operating conditions.

While most mass flow meters measure the flow rate at the actual conditions where the measurement is taking place, the general practice relates the flow rate to STP conditions, requiring knowing the airвЂ™s pressure and temperature at the measurement point. Dry air consists of nitrogen (78%), oxygen (21%), argon (>1%), and trace amounts of carbon dioxide, methane, hydrogen, helium, and neon. One may calculate the density of air at different pressures and temperatures by using the ideal gas law. However, compressing the air to 100 PSIG at 70В° increases the density to 0.58 lb./ft3. For example, at 90вЏ and an elevation of 5000 feet, with a pressure of 12.2 PSIG, air density is 0.060 lb./ft3. The density will vary based on the temperature and pressure. The dry air density at standard conditions for temperature and pressure (STP) (70В° F and 14.7 psi) is 0.0749 lb./ft3. The water content of air will vary depending on the region ranging from 1% to 4% in hot and high humidity areas. Additional gases that are considered pollutants may also be present in the parts per million range, such as sulfur dioxide, nitric oxide, and carbon monoxide.

Using a pitot tube at stp download#

Download this Application Brief All About AirДЄir is the most common gas on Earth and supports life.