Robert J Blanchard, P.Eng; 415 Kerrybrook Dr, Richmond Hill, ON, L4C 5M5; 905-8833947 Electronic Meter 0-5# certified gauge 0-60" w.g. magnehelic water column 4.823 ft.w.g. 2.09# 58.9 “ w.g. 58.33" 4.753 ft w.g. 2.04# 58.7 “ w.g. 57.35" 4.684 ft. w.g. 2.005# 58.2" w.g. 56.75" Threshold of motion 4.961 ft.w.g. 2.12# 59.95" w.g. 60.0" Increase to 61" 5.030 ft.w.g. 2.19# 60.5" w.g. 61.0" Note: The reading at the electronic meter increased slightly when the air supply pressure was held constant and the valve to the water column was closed, then returned to the previous reading when the valve was opened. We repeated this observation three times with consistent results. We did not investigate the correlation of individual meters or gauges with respect to two or more connected in parallel. There is reason to believe that each device reads a force and thus consumes some small portion of the energy applied. While there is merit in applying three or four devices to establish calibration, the data used for calculations should be collected from a single gauge to negate the effect of the energy consumed by the other devices. (6) What is the volume of the diamond shaped actuator at the equilibrium point for 60" w.g? Do not allow for the volume of the diaphragm, but qualify that it reduced the fluid volume by some amount. The calculated gross area contained by four 9.0" long sides of a rhombus with the short diameter of 1.0" is 8.9861in2. Thus the volume contained by the rhombus with a depth of 2.625" is 23.589in3 Although the force of about 60" w.g. is exerted equally and perpendicular over the entire inside surface of the diaphragm, the force does not appear to be transferred equally over the entire interior surface of the rhombus because of the wrinkles in the diaphragm and spaces. . The diaphragm within the rhombus that contains the force exerted on the walls of the rhombus occupies a considerable portion of the volume. The interior of the clear sides of the test rig are smeared with grease to address the friction of the moving sides of the rhombus. Precise measurement of the length of the interior walls of the rhombus, the short diameter, or the percentage of space occupied by the diaphragm is difficult because of the grease. (5) What is the travel to the equilibrium point at 62" w.g. from completely collapsed? The short diameter of the rhombus increased by 0.0858" from about 1" at 60" w.g. (4) What is the volume of the diamond shaped actuator at the equilibrium point for 62" w.g? Do not allow for the volume of the diaphragm, but qualify that it reduced the fluid volume by some amount. When the air pressure exerted upon the diaphragm was increased from 60" w.g. to 62" w.g. the short diameter increased by 2.18mm (0.0858in).(Lifted the weight 0.0858). Using the previous data as a base, the new volume increases to 25.605in3 a difference of 2.016in3 13.281
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