|Title:||Improving the Accuracy and Scope of Control-Oriented Vapor Compression Cycle System Models
|Author(s):||Eldredge, B.D.; Alleyne, Andrew G.
|Subject(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:||Air Conditioning and Refrigeration Center TR-246
|Sponsor:||Air Conditioning and Refrigeration Project 175
|Date Available in IDEALS:||2009-06-22