Measurement of the Relationship Between Oil Circulation and Compressor Lubrication in a Mobile AlC System: Part Two
Author(s)
Chappell, J.D.
Drozdek, J.C.
Cusano, C.
Hrnjak, P.S.
Miller, N.R.
Newell, T.A.
Issue Date
2000-07
Keyword(s)
mobile air conditioning systems
Abstract
This study used previously developed instrumentation to determine the state of
compressor lubrication in an automotive NC system during three transient tests. The
primary technique used in the study was measurement of the electrical contact resistance
at the shoe and swashplate interface. The secondary technique was dynamic
measurement of the swashplate cavity pressure.
Modifications were made to the existing test stand to allow the transient testing. The
first test was an oil run down test. This test was conducted until compressor failure
occurred. The second test was a liquid refrigerant slugging test, and the third test was a
dry start test. These tests demonstrated that the instrumentation techniques were able to
detect poor compressor lubrication conditions.
This work outlines the modifications made to the test loop and presents the results of
these transient tests. A conjecture is put forth to explain test results and possible future
work is discuss.
Publisher
Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
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