Experimental Techniques to Measure Compressor Performance and Reliability
Sunday, July 13, 2014 from 8:00a.m. to 5:00p.m.
Rawls Hall, Room 1086
West Lafayette, Indiana 47907
Main Organizers and Presenters:
Harry Clendenin, Emerson Climate Technologies
Craig R. Bradshaw, Torad Engineering
Joseph Karnaz, CPI Fluid Engineering
Derek Kultgen, CPI Fluid Engineering
Orkan Kurtulus, Purdue University
Kirill Ignatiev, Emerson Climate Technologies
Ian H. Bell, University of Liege
Eckhard A. Groll, Purdue University
Christian K. Bach, Purdue University
Sponsored and Organized by the Ray W. Herrick Laboratories
The short course focuses on presenting different experimental techniques that are used to measure compressor performance parameters and compressor reliability. In particular, the following topics will be part of the short course: compressor performance testing using calorimeters and hot gas bypass load stands, steady-state and dynamic instrumentation and data acquisition systems, experimental techniques to measure lubricant/refrigerant performance and reliability, performance testing of liquid flooded compression and compression with vapor injection. The short course consists of eight 45-minute lectures and will provide ample time for discussion.
08:00 – 08:10 am Introductions [Orkan Kurtulus]
08:10 – 09:00 am Compressor Performance Measurements Using Compressor Calorimeters [Harry Clendenin]
Introduction to a commonly used refrigeration cycle that measures heat transfer to characterize the capacity of a compressor, along with other performance attributes.
09:00 – 09:50 am Compressor Performance Measurements Using Hot-Gas Bypass Load Stands [Craig Bradshaw]
Principal of operation, physical design considerations, advantages/disadvantages compared to calorimeter, uncertainty analysis, and best practices using hot-gas bypass load stands.
09:50 – 10:10 am Coffee Break
10:10 – 11:00 am Experimental Techniques to Measure Lubricant/Refrigerant Performance and Reliability [Joe Karnaz and Derek Kultgen]
This presentation describes how the various lubricant and refrigerant interactions, such as miscibility, solubility, and stability, and changes to the lubricant and refrigerant chemistry affect reliability, performance, etc.
11:00 – 11:50 am Steady-State Compressor Test Stand Sensors and DAQ Systems [Orkan Kurtulus]
Brief introduction to steady state compressor testing. Determining minimum measurement points. Choosing right DAQ system for compressor tests. Importance to choose right measurement devices, pressure sensor, power meter, etc. What to consider for pressure, temperature, speed, torque, power, and other measurements. Trouble shooting your DAQ system.
12:00 – 01:00 pm Lunch Provided
01:00 – 01:50 pm Dynamic Sensors and DAQ Systems and Post Processing [Kirill Ignatiev]
Brief introduction to dynamic measurement of working process in a compressor. Sensor selection and placement in the compressor. Shaft synchronization. Data acquisition. Post processing principles: timing synchronization, bias and gain dynamic calibration, pressure diagram synthesis based on multiple transducer signals.
01:50 – 02:40 pm Liquid Flooded Compressor Performance Testing [Ian Bell]
Summary of results obtained from testing several positive displacement machines with oil flooding - here investigated as a means of achieving quasi-isothermal working process. Discussion of some of the experimental challenges associated with measurement of two-phase temperature measurements. Evaluation of fluid properties and mixtures.
02:40 – 03:00 am Coffee Break
03:00 – 03:50 pm Compressor Performance Testing with Vapor Injection [Eckhard Groll]
This presentation describes how to conduct compressor performance measurements when the compressor receives economized vapor that is directly injected during the compression process. The definition of volumetric and isentropic efficiencies based on the available measurements will be discussed in detail. Then investigation of the compressor into a system setup will be presented as well.
03:50 – 04:40 pm “In-System” Compressor Testing [Christian Bach]
Compressor testing is typically done in compressor calorimeters or in compressor test stands. This leads to different operating conditions than in actual applications, especially if the compressor is used in heat pump applications. In system testing leads to operating conditions as given in the actual application. This presentation shows the difference between compressor test stand testing and in system testing in terms of resulting compressor efficiency as well as in terms of limitations for the two approaches.
04:50 – 05:00 pm Open Discussion and Wrap-Up [All]
05:00 – 06:00 pm Optional Tour of the New Herrick Labs
The sessions will be be held in RAWLS HALL on the Purdue University Campus.