|Title:||Design and Construction of a Mobile Air Conditioning Test Facility for Transient Studies
|Contributor(s):||Dunn, W.E.; Miller, N.R.
|Subject(s):||mobile air conditioning systems
|Abstract:||Compared to other air-conditioning and refrigeration systems, mobile air-conditioning
systems are unique in the respect that they operate almost entirely under transient conditions.
The major operating transients include: (i) changes in compressor speed due to variations in
vehicle engine speed, (ii) changes in condenser air flow due to ram-air effects at the front of the
vehicle, (iii) changes in the passenger compartment air temperature during a pulldown mode, and
(iv) cycling of the compressor clutch to prevent evaporator frosting. A versatile experimental
facility has been developed to permit testing of mobile alc systems under a wide variety of both
transient and steady-state operating conditions. The facility serves as a flexible test bed for the
development and validation of transient system models, advanced mobile alc control techniques,
and on-board diagnostic tools for mobile applications. The air- and refrigerant-side loops of the
facility are thoroughly instrumented and can accommodate the stock or prototype components of
nearly any mobile alc system. The facility makes extensive use of controlled system-input
devices which allow the researcher to simulate the majority of the transient operating conditions
encountered by mobile alc systems in field usage. Transient demonstration tests show that the
facility is an excellent tool for conducting modeling, control, and diagnostic studies. Steadystate
validation tests show that the evaporator- and condenser-side energy balances are in need of
improvement. Sources of error have been identified, and an appropriate plan of corrective action
has been established.
|Publisher:||Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
|Series/Report:||Air Conditioning and Refrigeration Center TR-97
|Sponsor:||Air Conditioning and Refrigeration Project 51
|Date Available in IDEALS:||2009-04-22