As shown in the figure, air with a volumetric flow rate of 14,000 ft?/min enters an air-handling unit at 80°F, 1 atm. The air-handlingunit delivers air at 45°F, 1 atm to a duct system with three branches consisting of two 26-in.-diameter ducts and one 50-in. duct. Thevelocity in each 26-in. duct is 19 ft/s. Assume steady state operation and ideal gas behavior for the air.D- 50 in.DuctT- - 1- 45°FD, - D,- 26 in.V = V3systemAir-handling unit1+ A = P2 = P = P4 = 1 atmT= B0°F(AV)Determine the mass flow rate of air entering the air-handling unit, in Ib/s, the volumetric flow rate in each 26-in. duct, in ft/min, andthe velocity in the 50-in. duct, in ft/s.

The standard value of the density of air at 80oF and 1 atm is 0.0735 lb/ft3. Write the given data.…

Answered: As shown in the figure, air with a…

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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Assuming the clearance is negligible for a single stage compressor with the following data : Atmospheric pressure = 90 kPa, Atmospheric temperature = 17 degrees, Delivery pressure = 7 bar, Free air delivery flow rate = 0,2 m³/min. Take n= 1,3, Cp=1,005 KJ/Kg K, Cv=0,718 KJ/Kg K Determine the following : A) Which formula is used to evaluate the delivery temperature for an isentropic? B) the delivery temperature of air for a polytropic compression process with n=1,25 in Kelvin to 1 decimal place? C) the mass flow rate of air inside the compressor operating isentropically in kg/min to 3 decimal places? D) the power input to the compressor in kW to 2 decimal places if the compression is polytropic compression process with n=1,25? E) the power input to the compressor in kW to 3 decimal places if the compression reversible isothermal? F) the power input to the compressor if the compression is isentropic in kW to 3 decimal places? G) the delivery temperature of air for an isentropic…
State 1 for a dual combustion engine is p1 = 1 atm and T1 = 60.3 degrees Celcius; rk = 18; at the end of the constant volume combusion process the pressure is 7695 kPa, Re = 1.5 Base on 1 kg/cycle of a hot-air standard with k = 1.31, determine a) the percentage clearance, b) p, V and T at each corner point on the cycle c) W, d) e and e) Pm
The following data were obtained from a performance test of a 10 x 9-cm single acting, water jacketed two-stage air compressor: Pressures: Atmospheric, 102 kPaa; leaving first-stage, 634 kPaa; leaving second-stage, 4.20 MPa. Temperatures: Atmospheric, 240C; leaving first-stage, 1080C; entering 2nd stage, 250C; leaving 2nd stage, 1270C Compressor speed, 648 rpm Power input to motor, 5.65 kW Motor and belt efficiency, 81.5% The following are calculated from test data: Air flow rate, 0.387 ??⁄??? Compression exponents: 1st stage 1.15; 2nd Stage, 1.2 Calculate: a) Approximate indicated power b) Power for isothermal compression c) Shaft power d) 1st stage piston displacement e) Actual volumetric efficiency f) Isothermal compression efficiency g) Mechanical efficiency based on the approximate indicated power h) Over-all efficiency of the compressor
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Steam at 80 bar, 440 °C, enters aturbine operating at steady state with avolumetric flow rate of 236 m 3 /min.Twenty percent of the entering massflow exits through a diameter of 0.25m at 60 bar, 400 °C. The rest exitsthrough a diameter of 1.5 m with apressure of 0.7 bar and a quality of 90%. Determine the velocity at each exitduct, in m/s.
Air enters the compressor of an ideal air-standard Brayton cycle at 80 kPa, 299 K, with a volumetric flow rate of 6.1 m3/s. The compressor pressure ratio is 7. The turbine inlet temperature is 1886 K. Adopting the cold air-standard assumption, calculate: the mass flow rate of air to 3 d.p. in SI unit and privide unit symbol. Take the gas constant as 289 J/kg.K
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OTTO CYCLE At the start of an air-standard Otto cycle's compression process, P1 = 1 bar, T1 = 300 K, V1 = 380cm3. The maximum temperature in the cycle is 2400 K and the compression ratio is 9. Determine the: (d) the mean effective pressure, in bar. Show complete solution.
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hi At the beginning of the compression process of an air standard Otto cycle, p1 = 1 bar, T1 = 300 K. The maximum temperature in the cycle is 2250 K and the compression ratio is 9.8. The engine has 4 cylinders and an engine displacement of Vd = 2.6 L. Determine per cylinder: Only letters d,e, and f needed a) the volume at state 1.b) the air mass per cycle.c) the heat addition per cycle, in kJ.d) the heat rejection per cycle, in kJ. - <e) the net work per cycle, in kJ. - <f) the thermal efficiency. - <
State 1 for a dual combustion engine is P1 = 1 atm and T1 = 60.3°C; rk = 18; at the end of the constant volume combustion process the pressure is 7695 kPa, rc = 1.5. Base on 1 kgm/cycle of a hot-air standard with k = 1.31, determine (a) the percentage clearance, (b)p, V, and T at each corner point on the cycle, (c) WNET, (d) e, and (e) Pm. Ans. (a) 5.88%; (b) 0.9443 m, 0.05246 m3, 4468 kPa, 816.5 K, 1406.2 K, 0.07869 m3, 2109.3 K, 296.8 kPa, 976.3 K; (c)803.5 kJ; (d)57.43%; (e) 900 kPa

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