Converted from "108201_Default.txt"

Creation Date: 21-May-2002

 

Description

This AspenTech technical documentation for the COMPR model was created in 2002. Newer features are not covered, but the basic model equations are fundamental and unchanged. The current information for this unit operation can be found in the help in the Using the Simulation Environment -> Unit Operation Models Reference Manual -> Pressure Changers -> Compr Reference.


Single Stage Compressor/Turbine  
Model Name: COMPR-TURBINE (COMPR)  

 

Purpose

COMPR computes the work required for compression or the work yield by expansion in a single stage compressor/turbine. COMPR may also be used to calculate the outlet pressure, given the work input, or head or power performance curves for the compressor. 
 

Principles

COMPR computes the work required for compression or the work yield by expansion, and the outlet stream temperature, phase condition, and enthalpy. COMPR may also compute the outlet pressure if the work input is given. Eight types of calculations may be performed: 

• Isentropic compressor/turbine. 
• Isentropic centrifugal compressor using the GPSA method. 
• Isentropic centrifugal compressor using the ASME method. 
• Polytropic centrifugal compressor using the GPSA method. 
• Polytropic centrifugal compressor using the ASME method. 
• Polytropic centrifugal compressor using piecewise integration. 
• Polytropic positive displacement compressor using the GPSA method. 
• Polytropic positive displacement compressor using integration method. 

 For each type of calculation, given the appropriate efficiency, all outlet stream conditions and shaft work are computed. For polytropic compressors the outlet temperature, if known, may be entered as a second parameter. In this case the polytropic efficiency will be calculated. 

For isentropic compressors and turbines, COMPR can handle one-, two-, and three-phase mixtures. For polytropic compressors, COMPR is designed to handle a single, compressible phase. However, for special cases, two- or three-phase calculations are performed to determine the outlet stream conditions and to calculate the properties used in the compressor equations. The accuracy of the results depends on a number of factors such as the relative amounts of the phases present and the efficiency specified. The rigorous polytropic compressor uses real fluid properties calculated from the property option set. It does not assume ideal gas behavior. 
 

Model Description

In this section, the model types, calculation methods, and performance curves will be discussed. See the attached document for more information


KeyWords

compr
compressor