A compressor takes in air at a pressure of 67 kN/m2 . The pressure of the air at exit from the compressor is 167 kN/m2 . The mass flow rate and increase in specific enthalpy of the air are 0.25 kg/s and 80 J/g respectively. The intake and exit ducts are designed so that the velocities of the air equal in both. Calculate the power required to operate the compressor and the ratio of the duct areas inlet to exit. Assume that the compressor casing is adiabatic, gravity terms in the steady flow energy equation are negligible and the quantity Pv1.3 has the same value at inlet and exit.

A compressor takes in air at a pressure of 67 kN/m2 . The pressure of the air at exit from the compressor is 167 kN/m2 . The mass flow rate and increase in specific enthalpy of the air are 0.25 kg/s and 80 J/g respectively. The intake and exit ducts are designed so that the velocities of the air equal in both. Calculate the power required to operate the compressor and the ratio of the duct areas inlet to exit. Assume that the compressor casing is adiabatic, gravity terms in the steady flow energy equation are negligible and the quantity Pv1.3 has the same value at inlet and exit.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 10RQ: The seasonal energy efficiency ratio (SEER) includes the energy used in the _____and _____cycles.

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Question

Q2
A compressor takes in air at a pressure of 67 kN/m2
. The pressure of the air at exit from the
compressor is 167 kN/m2
. The mass flow rate and increase in specific enthalpy of the air are
0.25 kg/s and 80 J/g respectively. The intake and exit ducts are designed so that the velocities
of the air equal in both. Calculate the power required to operate the compressor and the ratio
of the duct areas inlet to exit. Assume that the compressor casing is adiabatic, gravity terms in
the steady flow energy equation are negligible and the quantity Pv1.3 has the same value at
inlet and exit.

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