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Reduction of MAC Power Requirement in a Small Car
Technical Paper
2010-01-0803
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In recent times, Mobile Air Conditioning (MAC) power consumption reduction has become an area of interest for OEMs worldwide due its significant impact on the fuel efficiency. On small cars with rear mounted and small capacity engines, MAC power consumption presents a formidable challenge to the climate control development engineers due to the spread layout of the system aggregates. Critical parameters which contribute significantly towards the higher MAC power consumption are mechanical, electrical and thermal loads.
The present work describes various ways towards the reduction of MAC power consumption through simulation and experimentation without compromising on the cooling performance and passenger comfort.
Using 1D KULI simulation, refrigerant circuit has been analyzed for proper selection (piston or vane type compressors), right sizing and location of system components. Front and rear mounted HVAC unit layouts are also analyzed to study the effects of refrigerant pipe dimensions and bends on power consumption. Front-end airflow over condenser is improved through 3D CFD analysis by optimizing bumper openings, air escape route and avoiding hot air recirculation along with analyzing the effect of gravity flaps on condenser fan shroud. IP ducts are designed through 3D air flow analysis for minimum airflow resistance which reduces blower motor wattage. Simulation results are validated through system bench calorimeter and vehicle level tests. A close correlation is observed between test and simulation results. The heat ingress inside the cabin is minimized by experimentally evaluating various options of cabin insulation material for roof, firewall, floor panels and tinting of glasses. Present study discusses the significance of various parameters and identifies the potential areas for the reduction of overall MAC power consumption.
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Authors
Topic
Citation
Shendge, S., Tilekar, P., Dahiya, S., and Kapoor, S., "Reduction of MAC Power Requirement in a Small Car," SAE Technical Paper 2010-01-0803, 2010, https://doi.org/10.4271/2010-01-0803.Also In
References
- Farrington R. Rugh J. “Impact of Vehicle Air-Conditioning on Fuel Economy, Tailpipe Emissions, and Electric Vehicle Range” Earth Technologies Forum 2000 Washington, D.C.
- Welstand, J.S. Haskew, H.H. Gunst, R.F. Bevilacqua, O.M. “Evaluation of the Effects of Air Conditioning Operation and Associated Environmental Conditions on Vehicle Emissions and Fuel Economy,” SAE Technical Paper 2003-01-2247 2003
- Kemle, A. Manski, R. Riegel, H. Weinbrenner, M. “Reduction of Fuel Consumption in Air Conditioning Systems,” SAE Technical Paper 2008-28-0025 2008
- Bharatan D. Chaney L. Farrington R.B. Lustbader J. Keyser K. Rugh J. “An Overview of Vehicle Test and Analysis form NREL's A/C Fuel Use Reduction Research” VTMS Nottingham, England May 07
- Marzy Roland Hager Josef Doppelbauer Clemens “Optimization of Vehicle Warm-up Using Simulation Tools” VTMS5 Conference 2001 Nashville, Tennessee, USA
- Hager Josef “Optimized Management of Auxiliaries for Passenger Cars with Respect to Comfort and Fuel Consumption Using Numerical Simulation” FISITA 2004 World Automotive
- Duleep K.G. “Worldwide perspective of mobile air conditioning and other car components” IEA Car Cooling Workshop Paris 23-24 October 2006
- KULI 7.1-0.03 User Manual