Donefan example.pdf2 of 2be increased to maintain the balance between fan and duct systemsd) When the damper installed in the duct is opened more, to maintain thebalance, the speed of the fan should be increased11. A fan is designed to operate at a rotative speed of 20 rps. At the designconditions the airflow rate is 20 m³/s, the static pressure rise is 30 Pa and the airtemperature is 20°C. At these conditions the fan requires a power input of 1.5kW. Keeping the speed constant at 20 rps, if the air temperature changes to10°C, what will be the airflow rate, static pressure and power input?= 20 rps= 20°C = 293 K= 20 m/sAns: At design condition 1,Rotative speed, 01Air temperature, T1Airflow rate,Q1Static pressure rise, Aps.1 = 30 PaPower input, W,%3D= 1.5 kWAt off-design condition 2, the rotative speed is same as 1, but temperaturechanges to 10°C (283 K), which changes the density of air. To find the othervariables, the fan law 2 has to be applied as density varies; i.e.,i) Airflow rate Q, = Q2 = 20 m'/sii) Static pressure rise at 2,Aps.2 = APs.1(P2/p1) = Aps.1(T1/T2) = 30(293/283) = 31.06 Pa(Ans.)%3Diii) Power input at 2,W2 = W;(p2/P1) = W;(T,/T2) = 1.5(293/283) = 1.553 kW(Ans.)%D%3D 12:28 AM Fri 9 Apr@ 77%Donefan example.pdf1- State which of the following statements are TRUE?a) Compared to forward curved blades, backward curved blades are moreEfficientb) Airfoil type blades are used in small capacity systemsc) Fan laws are applicable to all types of fansd) Fan laws are applicable to fans that are geometrically and dynamicallysimilar2- State which of the following statements are TRUE?a) For a given fan operating at a constant temperature, the power input tofanincreases by 4 times when the fan speed becomes doubleb) For a given fan operating at a constant temperature, the power input tofanincreases by 8 times when the fan speed becomes doublec) For a given fan operating at a constant flow rate, the power inputincreases asthe air temperature increasesd) For a given fan operating at a constant static pressure rise, the flow ratereduces as the air temperature increases3- State which of the following statements are TRUE?a) For a backward curved blade, the fan total pressure (FTP) increases asflowrate increasesb) For a backward curved blade, the fan total pressure (FTP) reaches amaximum at a particular flow ratec) When the air filter in the air conditioning duct becomes dirty, the speedhas to

GivenRelative speed ω1=20rpsAir temp T1=20°C =293KAir flow rate Q1=20m3/sStatic pressure rise…

11. A fan is designed to operate at a rotative speed of 20 rps. At the design conditions the airflow rate is 20 m³/s, the static pressure rise is 30 Pa and the air temperature is 20°C. At these conditions the fan requires a power input of 1.5 kW. Keeping the speed constant at 20 rps, if the air temperature changes to 10°C, what will be the airflow rate, static pressure and power input?

11. A fan is designed to operate at a rotative speed of 20 rps. At the design conditions the airflow rate is 20 m³/s, the static pressure rise is 30 Pa and the air temperature is 20°C. At these conditions the fan requires a power input of 1.5 kW. Keeping the speed constant at 20 rps, if the air temperature changes to 10°C, what will be the airflow rate, static pressure and power input?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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