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 = 2800 ft³/min. Assume the ideal gas model for air with c, = 0.24 Btu/lb-°R and ignore kinetic and potential energy effects.

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 = 2800 ft³/min. Assume the ideal gas model for air with c, = 0.24 Btu/lb-°R and ignore kinetic and potential energy effects.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

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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 = 2800 ft³/min. Assume the ideal gas
model for air with c, = 0.24 Btu/lb•°R and ignore kinetic and potential energy effects.
1 (AV)1 = 5000 ft /min Air, Co = 0.24 Btu/lb°R
T, = 80°F
p=1 atm
3 V3 = 400 ft/min
T3 = ?
2
(AV)2
Tz = 40°F
-Insulation
ft/min
Determine the temperature of the air at the exit, in °F, and the rate of entropy production within the ducts, in Btu/min-°R.

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