Wednesday, January 27, 2016: 11:00 AM-12:30 PM
Systems and Equipment
Chair:
Georgi Kazachki, Ph.D., Dayton Phoenix Group, Inc.
Technical Committee: 08.01 Positive Displacement Compressors
Sponsor: Refrigeration Committee
Advanced methods for modeling the compression process with low-GWP refrigerants and the associated challenges are discussed and illustrated on existing and new compressor designs.
1 Design Improvements of the Spool Compressor Using Comprehensive Modeling Techniques
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Craig Bradshaw, Ph.D., Torad Engineering |
The development of spool compressors for various applications is investigated. Using comprehensive modeling techniques it is shown how the various trade-offs in compressor design can be mitigated prior to extensive design and prototyping effort being expended. The study focuses on air-conditioning applications and the practical limitations associated with the comprehensive modeling approach.
2 Design Improvements of the Spool Compressor for Various Working Fluids Using Comprehensive Modeling Techniques
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Margaret Mathison, Ph.D., Iowa State University |
An in-depth analysis of the comprehensive model results of a spool compressor on various low-GWP refrigerants is presented. The heat transfer, leakage, and frictional components are explored independently. This analysis aims at demonstrating how the comprehensive modeling tools can be used to make more informed design decisions when comparing performance with various working fluids.
3 Modeling of an Oil-Free Carbon Dioxide Compressor Using Sanderson-Rocker Arm Motion (S-RAM) Mechanism
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Eckhard Groll, Dr.Ing., Purdue University |
A simulation model to predict the performance of a prototype CO2 compressor is presented. This prototype compressor employs the Sanderson-Rocker Arm Motion (S-RAM) mechanism, which converts the rotary motion of the shaft into a linear reciprocating motion of the cylinders. The piston stroke can be variable by changing the incline angle between the connecting rod and compressor main shaft centerline. The compressor model is mainly composed of two main sub-models simulating the kinematics of the drive mechanism and the compression process. A valve sub-model is included in the compression process model.