Standard and ANSI/ASHRAE Standard 51, except as modified by Units shall be tested in accordance with ANSI/AMCA Standard /ANSI/ASHRAE. Standard — Laboratory Methods of Testing Fans for Aerodynamic Performance Rating (ANSI/AMCA Standard ) (ANSI/ASHRAE Approved). and Air-Conditioning Engineers (ASHRAE) approved ANSI/AMCA Standard ANSI/ASHRAE Standard , Laboratory Methods of Testing Fans for.
|Published (Last):||27 November 2016|
|PDF File Size:||15.28 Mb|
|ePub File Size:||17.96 Mb|
|Price:||Free* [*Free Regsitration Required]|
When a cell straightener is used: Multi-point or continuous-record averaging can be accomplished with instruments or analyzers designed for this purpose. A piezometer ring is specified for pressure ashrze at upstream and downstream nozzle taps and for outlet duct or chamber measurement, unless a Pitot traverse is specified.
The results of a fan test are the various fan performance variables listed in Sections 3. This is easily obtained by using the specified calibration procedures.
However, three or four screens with decreasing percent of open area in the direction of airflow are suggested. In a chamber, the use awhrae either of the nozzle types shown above is permitted.
Smoothing means such as screens, perforated plates, or other media may be used. The pressure exerted by the atmosphere. The larger size is helpful in preventing blockage due to dust, water, ice, etc. See Note in Section 4. The flow meter will give a direct reading of the leakage rate. The static pressure at a point shall be measured on an indicator such as a manometer with one leg connected to atmosphere and the other leg connected to a static pressure sensor, such as a static pressure tap or the static tap of a Pitot-static tube.
Any combination of screens or perforated sheets may be used. When the mean of these readings is less than or equal to Pa 4 in. Individual pressure readings for each pressure tap of the piezometer ring are to be measured. When the mean of these readings is greater than Pa 4 in.
amca 210 07 airflow nozzle
An inlet duct used to provide a measurement station shall not be more than A fan shall be tested under this standard according to one of the four general Installation Types that exist in actual applications.
Alexa Actionable Analytics for aashrae Web. The point of operation where the fan static pressure is zero. Uncertainties Analysis  Informative F.
Typical fan performance curves are shown in Figure The combined uncertainty for each of the fan performance variables is given below.
Since the velocity determination depends on Reynolds Number, an approximation must be employed. A transducer type barometer ashdae be calibrated for each test. Dotted lines on fan inlet indicate an inlet bell and one equivalent duct diameter which may be used for inlet duct simulation.
A stroboscopic device triggered by the line frequency of a public utility is considered a primary instrument and need not be calibrated if it is maintained in good condition. For the test, positions around the periphery of the jets and slightly upstream of the settling means shall be scanned for reverse velocities. The user is cautioned that this latter type of ashrar may yield unreliable readings for a fan operating in an unstable region of its performance curve.
Hg, shall be used only for barometric pressure measurements. Withoutabox Submit to Asbrae Festivals. The tests are described in Sections A. If any of the criteria are not met, the design of the settling means must be altered, and all testing restarted. This standard applies to a fan or other air moving device when air is used as the test gas with the following exceptions: It zshrae always positive.
WOLTER PTE LTD.
A pressure tap is sensitive only to the pressure in the immediate vicinity of the opening. There is some evidence that efficiency improves with an increase in Reynolds number. This expression is exact for round duct straighteners and sufficiently accurate for 551-07 duct straighteners. The static pressure at a point may be sensed with a pressure tap of the proportions shown in Figure 2A.
The directions and points of application of all corresponding vectors must be the same.