6.72 WP Figure P6.72 shows data for a portion of the ducting in a ventilation system operating at steady state. The ducts are well in- sulated and the pressure is very nearly 1 atm throughout. Assuming the ideal gas model for air with c, = 0.24 Btu/lb · °R, and ignoring kinetic and potential energy effects, determine (a) the temperature of the air at the exit, in °F, (b) the exit diameter, in ft, and (c) the rate of entropy production within the duct, in Btu/min· °R. %3D D = 4 ft V = 400 f/min T = 80°F page2 3 V= 400 ft/min T3 = ? 2 Insulation

6.72 WP Figure P6.72 shows data for a portion of the ducting in a ventilation system operating at steady state. The ducts are well in- sulated and the pressure is very nearly 1 atm throughout. Assuming the ideal gas model for air with c, = 0.24 Btu/lb · °R, and ignoring kinetic and potential energy effects, determine (a) the temperature of the air at the exit, in °F, (b) the exit diameter, in ft, and (c) the rate of entropy production within the duct, in Btu/min· °R. %3D D = 4 ft V = 400 f/min T = 80°F page2 3 V= 400 ft/min T3 = ? 2 Insulation

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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Refrigerant 134a enters a well-insulated nozzle at 200 lbf/in.2, 170°F, with a velocity of 120 ft/s and exits at 50 lbf/in.² with a velocity of 1500 ft/s. For steady-state operation, and neglecting potential energy effects, determine the temperature, in °F, and the quality of the refrigerant at the exit. T₂= x2 = i i °F %
An oil pump operating at steady state delivers oil at a rate of 13 lb/s through a 1-in.-diameter exit pipe. The oil, which can be modeled as incompressible, has a density of 85 lb/ft3 and experiences a pressure rise from inlet to exit of 40 lb/in². There is no significant elevation difference between inlet and exit, and the inlet kinetic energy is negligible. Heat transfer between the pump and its surroundings is negligible, and there is no significant change in temperature as the oil passes through the pump. Determine the velocity of the oil at the exit of the pump, in ft/s, and the power required for the pump, in hp. Step 1 Your answer is correct. Determine the velocity of the oil at the exit of the pump, in ft/s. V₂ = 28.064 Hint Step 2 * Your answer is incorrect. ft/s Determine the power required for the pump, in hp. Win = 1.60155105 eTextbook and Media hp Attempts: 1 of 4 used
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The figure shows data for a portion of the ducting in a ventilation system operating at steady state. The ducts are well insulated and the pressure is very nearly 1 atm throughout. The volumetric flow rate entering at state 2 is AV₂ = 3600 ft3/min. Assume the ideal gas model for air with cp = 0.24 Btu/lb-ºR and ignore kinetic and potential energy effects. (AV)₁ = 5000 ft³/min Air, Cp=0.24 Btu/lb R T₁ = 80°F p=1 atm 2 (AV)₂ T₂ = 40°F ft³/min 3 V3 = 400 ft/min T3 = ? -Insulation Determine the temperature of the air at the exit, in °F, and the rate of entropy production within the ducts, in Btu/min.°R.
Refrigerant 134a enters a well-insulated nozzle at 200 Ibf/in.?, 170°F, with a velocity of 120 ft/s and exits at 50 Ibf/in.2 with a velocity of 1500 ft/s. For steady-state operation, and neglecting potential energy effects, determine the temperature, in °F, and the quality of the refrigerant at the exit. T2 = i °F i % X2 =
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