![]() ![]() For −41 ☌ and −20 ☌ they were compatible only up to 3 MPa. ![]() For +5 ☌ the differences between the measured and literature values were compatible with the respective uncertainties. The measurements used for the validation at −41 ☌ and −20 ☌ with nitrogen and at +5 ☌ with air were also used to calculate the enhancement factor at pressures up to 6 MPa. In fact, the model reproduces the experimental dew-point temperature data within average absolute deviation (AAD) between 0.1 and 2.1 K. The validation results showed that the new generator, over the tested temperature and pressure range, can be used with a standard uncertainty of 0.02 ☌ frost/dew point. This method has been chosen because can be used to adequately predict the dew points of the all mixtures of our interest in the dew temperature and pressure ranges. For the validation the flow through the dew-point generator was varied up to 10 l min −1 (at 23 ☌ and 1013 hPa) and the dew point of the gas entering the generator was varied up to 15 ☌ above the dew point exiting the generator. It is mainly found in the atmosphere, where it accounts for 78 by volume of the air we breath. Nitrogen is an inert gas with many industrial applications. In this paper, we report the validation of the new primary dew-point generator in the temperature range −41 ☌ to +5 ☌ and the pressure range 0.1 MPa to 6 MPa using nitrogen and air. In standard conditions (1.013 bar, 15☌) m³ (Volume) kg. Saturation vapor density 51 g/m (from the chart). The Eng-Tips staff will check this out and take appropriate action. The temperature of compressed air is 40☌ (104☏). Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The temperature range of the standard is from −80 ☌ to +20 ☌. Intake air temperature is 20☌ (68☏) with RH of 60, for absolute humidity (actual vapor density) of 10.3 g/mNOAA calculator. The Liquid Nitrogen Chiller allows much faster dew point determination but there is an. Molecular masses and mole fractions for dry air currently used (2010) for flow calibrations. A new primary humidity standard was developed at VSL that, in addition to ordinary operation with air and nitrogen at atmospheric pressure, can be operated with other carrier gases such as natural gas at pressures up to 6 MPa and SF 6 at pressures up to 1 MPa. for mixtures with xH2O < 0.02 (dew point temperature < 291 K). ![]()
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