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ASHRAE - 4704

Analysis and Validation of a Psychrometric Apparatus

active, Most Current
Organization: ASHRAE
Publication Date: 1 January 2004
Status: active
Page Count: 8
scope:

This article uses the analysis ofvariance as a tool to validate a calibration apparatus for temperature and relative humidity sensors. The validation procedure establishes the operational ranges for measurement of the dry-bulb (tdb) and wet-bdb (twb) temperatures andofthe relative humidity of air (RH) for this particular apparatus. Analyses are carried out testing twb as afunction of air speed ranging from I . 25 to 5.00 m/s and twb as afunction of RHand also compares two environments to calibrate tdb: either in thermostatic bath or in the airjlow of a test section. The results show that air speed on wet covered semors within the tested range of I . 25 io 5. O m/s does not change the measured twb, thus widening the range suggested in ASHRAEStandard41.1-1974.H owevecfor relative humidity of air within the studied range, significant differences are found, and these are close to the 2-3% indicated range. The use of different calibrated sensorsfor tdb result in different calculated RHc values in a controlled environment.

Document History

4704
January 1, 2004
Analysis and Validation of a Psychrometric Apparatus
This article uses the analysis ofvariance as a tool to validate a calibration apparatus for temperature and relative humidity sensors. The validation procedure establishes the operational ranges for...

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