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Example 14-1 - Operating Point of a Fan in a Ventilation...

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Operating Point of a Fan in a Ventilation System
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Operating Point of a Fan in a Ventilation System A local ventilation system is used to remove contaminants by a dry-cleaning operation. The equivalent roughness height of this round duct is 0.15 mm. The ID is 9.06 in. and the length is 44.0 ft. There are five elbows along the duct with a minor loss coefficient Co = 0.21. To ensure adequate ventilation, the minimum volume flow rate is 600 cfm at 25 °C. The hood entry loss coefficient is 1.3. When the damper is fully open, its loss coefficient is 1.8. A centrifugal fan with inlet and outlet diameter of 9 inches is available. Its performance data is shown in Table 14.1. Predict the operating point of this system, and draw a plot of required and available fan pressure rise as function of volume flow rate. Is the chosen fan adequate?
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Givens D pipe = 9.06 inches L = 44.0 feet E = 0.15 mm N = 5 (numer of elbows) Co = Ko = 0.21 for elbows Q min = 600 cfm K L, entry = 1.3 K L, damper = 1.8 D fan = 9.0 inches
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Assumptions 1.Flow is steady.
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