Thursday, February 7, 2019

Experimental Study of Mobile Air Conditioning System Transient Behavior

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An experimental study of the the transient behavior of an automobile air conditioning system was performed. The experiments were conducted on an original equipment air conditioning system modified for laboratory investigation. Qualitative results showing a clear relationship between refrigerant charge and mean clutch cycling period, and between refrigerant charge and the transient behavior of the evaporator outlet refrigerant temperature, were obtained.

A five-factor, two-level, designed experiment was performed to determine the sensitivity of the clutch cycling period of the air conditioning refrigeration system to small (8%-15%) changes in: condenser air flow rate, condenser air inlet temperature, evaporator air inlet temperature, compressor speed, and refrigerant mass. The values chosen for each factor were based on a nominal operating condition which assumed a vehicle speed of 60 mph, and an air conditioning system operating on maximum cold setting, full recirculation, and maximum evaporator speed. The test facility permitted the control of condenser and evaporator air flow rates and inlet air temperatures, compressor speed, and refrigerant charge. Evaporator fan speed was set at the same value for all tests, and all tests were run dry coil.

List of Tables
List of Figures
1. Introduction
2. Literature Review
3. Experimental Facility Description
4. Refrigerant Charge Loss Experiments
5. Conclusions
Appendix A. Pressure Transducer  Calibration
Appendix B. Zone Box Diagrams
Appendix C. Programmable Logic Controller System
Appendix D. Charge Optimization Test Plans
Appendix E. Experimental Facility Energy Balance Validation
Appendix F. Clutch Cycling Data

Author Details
"C. D. Collins"

"N. R. Miller"

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