BS EN IEC 60879:2019 pdf download
BS EN IEC 60879:2019 pdf download.Comfort fans and regulators for household and similar purposes – Methods for measuring performance (IEC 60879:2019).
5.2.1.3 Arrangement of apparatus
The plane of the fan blades lies In the plane of the top edge of the clapboard containing the top opening In the roof of the test chamber.
A flat plate is installed above the ceiling fan, the size of which shall be between 1.1 and 1,2 times the blade diameter- The distance between the plate and the plane Qf the fn blades is determined by the distance between the plane of the Ian blades and the ceiling after the ceiling fan has been installed in accordance with the instructions for use.
The plane of the anemometer’s vane is parallel to the plane of the fan blades, The anemometers shall be moved in either direction along both diagonals of the test chamber in a test plane 1 500 mm ± 10 mm below the plane of the fan blades. The anemometers shall be supported In such a manner as to cause as little obstruction as possible to the air flow.
5.2.1.4 Procedure for test
The measurements shall be carried out with the fan running at full speed at the test voltage.
Air velocity measurements in each of four directions shall commence at a point 40 mm from the axis of the fan blades and shall progress honzontally to the fan blade axis In increments of 80 mm along the semi.diagonals of the test chamber (3 to A. 3 to B. 3 to AA and 3 to BB In Figure 2). The measurements shall be contInued in the 80-mm Increments until the air velocity in each of the four directions falls below 9 mimin.
The air velocity shall be averaged over a period of 60 s using an update rate of not less than 2 Hz.
The average air velocity through each annulus is taken as the mean of the 8 air velocities obtained at each anemometer position on the inner and outer radii of the annulus. The mean radius of each anrtulus is equal to the mean of the inner and outer radii of the annulus. Average air velocities below 9 m!min are discarded.
5.2.1.5 Calculation of flow rate
For each annulus having an average air velocity equal to or greater than 9 mlmin. the product of the area of the annulus and the average air velocity through that annulus. shall be taken as the air delivery through that annulus.
The sum of the air deliveries through all such annuli shall be taken as the measured flow rate of the fan for the purposes of this document.
No correction is made for relative humidity or air pressure.
5.2.2 Comfort fans other than ceiling fans
5.2.2.1 Test chamber
The fan shall be tested in a test chamber having the following dimensions: length: 4 500 mm for the sweep size or the equivalent sweep size (for bladeless fans) not larger than 400 mm, and 6 000 mm fOr the sweep size or the equivalent sweep size (for bladeless fans) larger than 400 mm. width: 4 500 mm. height: 3 000 mm. The chamber shall be suitably protected from extraneous draughts.
The te5t chamber shall be free from obstructions other than the stand on which the fan is kept. Any table or shelf for electrical instruments shall be on the opposite side of the fan to the test plane, beyond a distance of 900 mm from the plane of fan blades for the fans other than tower fans and bladeless fans, or the plane of the air outlet for tower fans and bladeless fans.
NOTE For beer fans, the plane of me an outlet ref en to the logItudinaI c,oss-seciional plane. vertical to the cnfri 1in, For bi.d.4.s f.n,. lb. plane of lb. air ouhet rfqns to th oullet ptane closer to the an.molnet.r,.
Any air conditioning apparatus used in the test room shall have no influence on the movement of the air in the test chamber while the test is in progress.
5.2.2.2 Arrangement of apparatus
The fan shall be located in the test chamber and arranged as follows.
