Improving the Accuracy and Scope of Control-Oriented Vapor Compression Cycle System Models

Eldredge, B.D.; Alleyne, Andrew G.

Permalink

https://hdl.handle.net/2142/12357 Copy

Description

Title

Improving the Accuracy and Scope of Control-Oriented Vapor Compression Cycle System Models

Author(s)

• Eldredge, B.D.
• Alleyne, Andrew G.

Issue Date

2006-08

Keyword(s)

vapor compression cycle systems

Abstract

The benefits of applying advanced control techniques to vapor compression cycle systems are well know. The main advantages are improved performance and efficiency, the achievement of which brings both economic and environmental gains. One of the most significant hurdles to the practical application of advanced control techniques is the development of a dynamic system level model that is both accurate and mathematically tractable. Previous efforts in control-oriented modeling have produced a class of heat exchanger models known as moving-boundary models. When combined with mass flow device models, these moving-boundary models provide an excellent framework for both dynamic analysis and control design. This thesis contains the results of research carried out to increase both the accuracy and scope of these system level models. The improvements to the existing vapor compression cycle models are carried out through the application of various modeling techniques, some static and some dynamic, some data-based and some physics-based. Semiempirical static modeling techniques are used to increase the accuracy of both heat exchangers and mass flow devices over a wide range of operating conditions. Dynamic modeling techniques are used both to derive new component models that are essential to the simulation of very common vapor compression cycle systems and to improve the accuracy of the existing compressor model. A new heat exchanger model that accounts for the effects of moisture in the air is presented. All of these model improvements and additions are unified to create a simple but accurate system level model with a wide range of application. Extensive model validation results are presented, providing both qualitative and quantitative evaluation of the new models and model improvements.

Publisher

Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.

Series/Report Name or Number

Air Conditioning and Refrigeration Center TR-246

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/12357

Sponsor(s)/Grant Number(s)

Air Conditioning and Refrigeration Project 175

Owning Collections