This content is not included in your SAE MOBILUS subscription, or you are not logged in.
A Thermal Energy Operated Heating/Cooling System for Buses
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 12, 2010 by SAE International in United States
Annotation ability available
The passenger cabin heating and cooling has a considerable impact on the fuel economy for buses, especially during the waiting period. This problem becomes more significant for the hybrid buses for which the impact of the auxiliary load on the fuel economy is almost twice that on the conventional buses. A second-law analysis conducted in this study indicates that a heat-driven AC system has higher energy utilization efficiency than the conventional AC system. On the basis of this analysis, a concept waste-heat-driven absorptive aqua-ammonia heat pump system is proposed and analyzed. Results of the analysis show that the heat-driven system can reduce the engine auxiliary load significantly because it eliminates the conventional AC compressor. In the AC mode, its energy utilization efficiency can be up to 50%. In the heating mode, the effective efficiency for heating can be up to 100%. In cases where the engine waste heat is insufficient or unavailable (e.g., when the engine is shut down), the required heat for operating the system can be provided by a directly-fired backup fuel burner. This heat-driven system can separate the passenger cabin heating and cooling from the engine propulsion system. This system is very appropriate for hybrid buses. Although the absorptive heat pump system proposed in this study targets on buses, it can also be applied to any type vehicles for which the system can be packaged.
CitationTeng, H., "A Thermal Energy Operated Heating/Cooling System for Buses," SAE Technical Paper 2010-01-0804, 2010, https://doi.org/10.4271/2010-01-0804.
- ASHRAE Handbook - Applications Chapter 9, “Automobiles and Mass Transit,” 1997
- Rugh, J. Farrington, R. “Vehicle Ancillary Load Reduction Project Close-out Report,” NREL Technical Report, No.NREL/TP-540-42454 2008
- Farrington, R. Rugh, J. “Impact of Vehicle Air-Conditioning on Fuel Economy, Tailpipe Emissions, and Electric Vehicle Range,” NREL Technical Report, No.NREL/CP-540-28960 2000
- Baehr, H.D. Thermodynamik Springer 2005
- Ahern, J.H. The Exergy Method of Energy Systems Analysis John Wiley & Sons 1980
- Keenan, J.H. “A System Chart for Second Law Analysis,” ASME Mechanical Engineering 54 195 204 1932
- Gaggioli, R.A. “Principles of Thermodynamics,” Thermodynamics: Second Law Analysis Gaggioli R.A. 3 13 American Chemical Society 1980
- Bejan, R.B. Advanced Engineering Thermodynamics John Wiley & Sons 1988
- Aya, K. Yanagimoto, K. Kadio, M. Murozono, J. “Development of Energy-Saving Air-Conditioning System for New COLT,” Mitsubishi Motors, New Technology Review 16 65 71 2004
- Rosso, J.A. Bazzo, E. “Thermodynamic Modeling of an Ammonia-Water Absorption System Associated with a Microturbine,” Int. J. Thermodynamics 12 38 43 2009
- Patek, J. Klomfar, J. “Simple Functions for Fast Calculations of Selected Thermodynamic Properties of the Ammonia-Water System,” Int. J. Refrig. 18 228 234 1995
- McQuiston, F. C Parker, J.D. Spitler, J.D. Heating, Ventilating and Air Conditioning Analysis and Design John Wiley and Sons, Inc. 2005
- Stodolsky, F. Linda Gaines, L. Vyas, A. Analysis of Technology Options to Reduce the Fuel Consumption of Idling Trucks Argonne National Laboratory Report No. ANL/ESD-43 2000