In this problem, an adiabatic air compressor will be analyzed.
Assume that the inlet air conditions are 25 [°C] and 1.0 [atm] with
a flow rate of 190 [m³/min]. The design calls for an outlet
temperature of 190 [°C]. The compressor has been streamlined and
therefore its efficiency is virtually 100%. The heat-capacity
constants for air is given by equation (4.4) with the following
constants from Appendix C, Table C.1: A = 3.509; 1000·K×B = 0.575;
C = 0; D/(100,000·K²) = 0 Since D is so small (the smallest one in
Table C.1), you may safely assume that D = 0 in this problem.
calculate and report the following:
The molar flow rate of air: ____ [mol/s]
The outlet air pressure: ______ [kPa]
The change in molar enthalpy: _____ [kPa]
The required power: ______[kW] and _______[hp]
The change of entropy in the compression:
_____ [J/mol·K]
- In This Problem An Adiabatic Air Compressor Will Be Analyzed Assume That The Inlet Air Conditions Are 25 C And 1 0 1 (184.7 KiB) Viewed 101 times
a In this problem, an adiabatic air compressor will be analyzed. Assume that the inlet air conditions are 25 [°C] and 1.0 [atm] with a flow rate of 190 [m3/min]. The design calls for an outlet temperature of 190 [°C]. The compressor has been streamlined and therefore its efficiency is virtually 100%. The heat-capacity constants for air is given by equation (4.4) with the following constants from Appendix C, Table C.1: A = 3-509; 1000-KxB = 0.575; C = 0; D/(100,000-K2) = 0 Since D is so small (the smallest one in Table C.1), you may safely assume that D = o in this problem. Requirements: Please, calculate and report the following: 1. The molar flow rate of air: [mol/s] (4 pts.) 2. The outlet air pressure: [kPa] (3 pts.) 3. The change in molar enthalpy: [kPa] (5 pts.) 4. The required power: [kW] (4 pts.) ...or: [hp](3 pts.) 5. The change of entropy in the compression: [J/mol.K] (4 pts.) 6. Assume now that the compressor is not fully reversible and has a 95% efficiency instead and it is operated so that the outlet pressure is the same as before. The required power now is: [hp] (3 pts.) ... and the new outlet temperature is: [°C]