Summary
The increased usage of hybrid and electric vehicles where waste heat availability is limited has spurred research and development of mobile heat pump systems. Many options exist for heat pump system architectures and refrigerants to be used. Currently R134a use is prevalent in vehicle air conditioning systems but offers poor heat pump performance at low ambient temperatures. Two refrigerants will be explored in this paper, R744 and R445A. Both of these refrigerants are getting attention in vehicle A/C systems because of their relatively low GWP but each offers benefits over R134a in heat pump systems as well. Both refrigerants operate at higher pressures which improves the performance at low ambient temperatures in part due to higher compressor inlet refrigerant densities. R134a (and R445A to a lesser extent) also suffer from the drawback of going into sub-atmospheric pressure operation at temperatures commonly seen in vehicles. Data will be shown for multiple system architectures comparing these refrigerants to R134a. Advantages and disadvantages of each refrigerant will be shown. System control and optimization is important to get the maximum performance from each refrigerant and system. Control exploration will be presented for each alternative refrigerant.
Available documents
Format PDF
Pages: 10 p.
Available
Public price
20 €
Member price*
15 €
* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).
Details
- Original title: Mobile heat pump exploration using R445A and R744.
- Record ID : 30013341
- Languages: English
- Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
- Publication date: 2014/07/14
Links
See other articles from the proceedings (203)
See the conference proceedings
Indexing
-
Themes:
Heat pumps techniques;
HFCs;
CO2;
Mobile air conditioning;
Blends - Keywords: R134a; Comparison; Car; R744; Heat pump; Performance; Expérimentation; Refrigerant; Air conditioning; CO2
-
Performance evaluation of an R134a automotive h...
- Author(s) : HOSOZ M., DIREK M., YIGIT K. S., et al.
- Date : 2015/03
- Languages : English
- Source: Applied Thermal Engineering - vol. 78
View record
-
Comparison of automotive air-conditioning syste...
- Author(s) : PREISSNER M., CUTLER B., SINGANAMALLA S., et al.
- Date : 2000/07/25
- Languages : English
- Source: Final proceedings of the 4th IIR-Gustav Lorentzen Conference on Natural Working Fluids at Purdue.
- Formats : PDF
View record
-
R-744 two-evaporator system for US army high mo...
- Author(s) : PEUKER S., HRNJAK P.
- Date : 2006/07/17
- Languages : English
- Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
- Formats : PDF
View record
-
An experimental study on performance of automot...
- Author(s) : LEE D. W., YOO S. Y.
- Date : 2006/05/21
- Languages : English
- Source: ACRA-2006. Proceedings of the 3rd Asian conference on refrigeration and air conditioning.
View record
-
Investigation on additional fuel consumption fo...
- Author(s) : GRAZ M.
- Date : 2009/02/11
- Languages : English
View record