6. (a) A 0.9 m diameter backward curved centrifugal fan is supplying 4 m3/s at 325...

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6. (a) A 0.9 m diameter backward curved centrifugal fan is supplying 4 m3/s at 325 Pa, 1000 rpm and 1750 W. A fan geometrically similar to this fan must operate at 425 Pa and 1 m³/s. Determine the wheel diameter, speed and power required. [0.42 m, 2446 rpm, 567 W] (b) The fan in (a) supplies 3 m³/s at 1000 rpm. The system is altered so that the resistance is less and delivers 4 m³/s. Determine the speed at which the fan must operate to supply exactly 3 m³/s and the static pressure of that fan. [750 rpm, 182.81 kPa] 6. (a) A 0.9 m diameter backward curved centrifugal fan is supplying 4 m3/s at 325 Pa, 1000 rpm and 1750 W. A fan geometrically similar to this fan must operate at 425 Pa and 1 m³/s. Determine the wheel diameter, speed and power required. [0.42 m, 2446 rpm, 567 W] (b) The fan in (a) supplies 3 m³/s at 1000 rpm. The system is altered so that the resistance is less and delivers 4 m³/s. Determine the speed at which the fan must operate to supply exactly 3 m³/s and the static pressure of that fan. [750 rpm, 182.81 kPa]