Article | Proceedings of The American Modelica Conference 2018, October 9-10, Somberg Conference Center, Cambridge MA, USA | Investigation of fuel reduction potential of a capacity controlled HVAC system for buses using virtual test drives Linköping University Electronic Press Conference Proceedings
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Title:
Investigation of fuel reduction potential of a capacity controlled HVAC system for buses using virtual test drives
Author:
Christian Kaiser: TLK-Thermo GmbH, Germany Sebastian Sebastian: Institut für Thermodynamik, TU-Braunschweig, Germany Wilhelm Tegethoff: TLK-Thermo GmbH, Germany Jürgen Köhler: Institut für Thermodynamik, TU-Braunschweig, Germany
DOI:
10.3384/ecp181547
Download:
Full text (pdf)
Year:
2018
Conference:
Proceedings of The American Modelica Conference 2018, October 9-10, Somberg Conference Center, Cambridge MA, USA
Issue:
154
Article no.:
001
Pages:
7-16
No. of pages:
10
Publication type:
Abstract and Fulltext
Published:
2019-02-26
ISBN:
978-91-7685-148-7
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press, Linköpings universitet


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The refrigerant cycle in conventional omnibus HVAC systems has a significant influence on fuel consumption and, as a result, on vehicle emissions. The additional emissions resulting from the use of the air conditioning system are called indirect emissions. In addition, there are so-called direct emissions from the air conditioning system caused by unintended leakage of refrigerant. A reduction in indirect emissions can be achieved, for instance, by adjusting the capacity of the refrigerant compressor. A reduction in direct emissions can be achieved by so-called alternative or natural refrigerants. To investigate approaches to reducing direct and indirect emissions, a total vehicle simulation model of a coach with detailed HVAC systems was developed with full implementation in Modelica. For this total vehicle simulation of a coach with a detailed HVAC system, a refrigerant cycle based on the natural refrigerant CO2 (R-744) was modeled and validated. In addition, an efficient control strategy was developed by adjusting the capacity of the refrigerant compressor to cover the actual cooling capacity demand and save fuel. Based on virtual driving test scenarios, the fuel saving potential of the developed compressor capacity control strategy is investigated to determine average annual fuel savings.

Keywords: HVAC, MAC, Energy efficiency, Omnibus, Total vehicle simulation, Virtual test drive, R-744, Fuel saving, Compressor capacity control, Cooling capacity control, Thermal systems

Proceedings of The American Modelica Conference 2018, October 9-10, Somberg Conference Center, Cambridge MA, USA

Author:
Christian Kaiser, Sebastian Sebastian, Wilhelm Tegethoff, Jürgen Köhler
Title:
Investigation of fuel reduction potential of a capacity controlled HVAC system for buses using virtual test drives
DOI:
http://dx.doi.org/10.3384/ecp181547
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Proceedings of The American Modelica Conference 2018, October 9-10, Somberg Conference Center, Cambridge MA, USA

Author:
Christian Kaiser, Sebastian Sebastian, Wilhelm Tegethoff, Jürgen Köhler
Title:
Investigation of fuel reduction potential of a capacity controlled HVAC system for buses using virtual test drives
DOI:
https://doi.org10.3384/ecp181547
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