As shown in Figure (right), air enters a pipe at 25°C, 100 kPa with a volumetric flow rate of 23 m³/h. On the outer pipe surface is an electrical resistor covered with insulation. With a voltage of 120 V, the resistor draws a current of 4 amps. Assuming the ideal gas model with cp = 1.005 kJ/kg . K for air and ignoring kinetic and potential energy effects, determine (a) the mass flow rate of the air, in kg/h, and (b) the temperature of the air at the exit, in °C. Insulation- Air T₁=25°C P₁ = 100 kPa (AV)₁=2 = 23 m²/h -Electrical resistor

As shown in Figure (right), air enters a pipe at 25°C, 100 kPa with a volumetric flow rate of 23 m³/h. On the outer pipe surface is an electrical resistor covered with insulation. With a voltage of 120 V, the resistor draws a current of 4 amps. Assuming the ideal gas model with cp = 1.005 kJ/kg . K for air and ignoring kinetic and potential energy effects, determine (a) the mass flow rate of the air, in kg/h, and (b) the temperature of the air at the exit, in °C. Insulation- Air T₁=25°C P₁ = 100 kPa (AV)₁=2 = 23 m²/h -Electrical resistor

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

See similar textbooks

Similar questions

Steam at 1 MPa, 250 °C is contained in a rigid vessel. It is now cooled to 25 ° C. The final quality (If applicable) of the vessel contents is:
Steam, initially at 5 MPa, 280°C undergoes a polytropic process in a piston–cylinder assembly to a final pressure of 20 MPa. If the polytropic constant, n = 1.4, calculate the non-flow work in kJ/kg.
Calculate the energy requirement to raise the temperature of 1 kg of water from 60 ° C of water to 90 ° C using the following approach; a. Average specific heat usage (Tab A Singh's Book. 4.1) = kJ b. The enthalpy change in the water - vapor saturation table (Tab A Singh's Book. 4.2) = kJ
Refrigerant 134a at p1 = 30 lbş/in?, T1 = 40°F enters a compressor operating at steady state with a mass flow rate of 250 lb/h and exits as saturated vapor at p2 = 160 lbę/in?. Heat transfer occurs from the compressor to its surroundings, which are at To = 40°F. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 2.5 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr-°R.
Air exits a turbine at 150 kPa and 150°C with a volumetric flow rate of 4,000 liters/s. Modeling air as an ideal gas, determine the mass flow rate, in kg/s. n = i kg/s
B5
Q3: In a steam jacket cylinder, steam expands from 5 bar to 0.12 MPa according to a law pv1.05 = constant. Assuming that initial dryness fraction is 90%, calculate the work done and heat supplied for 0.5 kg of steam during the expansion.
A well-insulated 4 × 4 × 5 m³ room, initially at 10 °C, is heated by the radiator of a steam heating system. The radiator has a fixed volume of 150 L and is initially filled with superheated water vapor at 200 kPa and 200 °C. After 30 minutes, the pressure of the steam is observed to drop to 100 kPa as a result of heat transfer to the room. Assume constant specific heats for air. (a) (b) (d) Sketch a thermodynamic diagram for the process of the steam. Determine the final temperature of the steam. Based on the final state you found, make any corrections needed to your diagram in (a). neglected. the air. Write the First Law for the air and steam, and indicate which terms can be Assuming the air has a uniform temperature, find the final temperature of