Automatic Control of Air, Handling System HVAC

A fan delivers air Co a ventilating system at total pressure difference 500 Pa, The fan is running at 10 rev s, and the shaft power needed in these conditions is 7.46 kW. Determine the volume flow, total pressure difference, and shaft power if the fan speed is increased to 12.5 rev 

The new operating point is on the affinity paratnala through 7, = 1.55 m s , and = 500 Pa. From Fx. (9.136) we have for corresponding points on the affinity parabola 

-Saarela, M., Puhaltimet. Tekmikan k dsiknja, osa6p, pp. 123-155, Jyvaskyla K. ]. Caimmcrus, 1960. 

Turbines, compressors and fans. New York McGraw-Hill, 1.9.90. 

Douglas, J. E, Gasiorek, J. M., Swaffield, J. A. Fluid mechanics. London Longman, 1985. 

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