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Variation in System Performance while Sorting DEF Heating Hardware Options
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 10, 2018 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
The desire to reduce NOx at low ambient temperatures drives the use of heating methods to make DEF available by thawing the solution in the tank. Methods to validate modelling used to design hardware options require testing to gauge the accuracy of the prediction. Using a climatic chassis dynamometer (CCD) to demonstrate the guidance procedure set by the Environmental Protection Agency (EPA) is expensive and time consuming. A method of utilizing a flow controlled cooling supply combined with a standard cold chamber is described as a precursor to running the demonstration in the CCD. Testing multiple quantities of design iterations produced unexpected variation in the results. The sources of the variation and modifications taken to minimize them are discussed and presented. Test to test control of coolant flow, coolant temperature, and specific chamber temperature inconsistencies were found to be critically important to a successful effort. Several design iterations were compared with varying degrees of success. The method was modified as variation between tanks of the same design was noted. System description details as well as modifications to the process are discussed. A design that maximizes heat transfer to the DEF pick up area while providing enough heat to melt the remainder of the volume was found to clearly out-perform the others. Test apparatus details are described. The DEF heating loop system is exposed to varying temperatures and flows in the truck. Selection of a representative coolant flow and temperature is discussed. The EPA certification test method options are referenced. Control parameters are defined with the intent of demonstrating a test practice that minimizes CCD time and ultimately accurately predicts hardware performance on the certification test.
CitationVermiglio, E., Gilliam, K., Chin, A., Leonard, T. et al., "Variation in System Performance while Sorting DEF Heating Hardware Options," SAE Technical Paper 2018-01-1813, 2018, https://doi.org/10.4271/2018-01-1813.
Data Sets - Support Documents
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- “Revised Guidance for Certification of Heavy-Duty Diesel Engines Using Selective Catalyst Reduction (SCR) Technologies,” United States Environmental Protection Agency National Vehicle and Fuel Economy Laboratory Guidance Letter dated 12/09/2009 CISD-09-04 REVISED (HDDE).
- Hirata, K., Masaki, N., Ueno, H., and Akagawa, H., “Development of Urea-SCR System for Heavy-Duty Commercial Vehicles,” SAE Technical Paper 2005-01-1860, 2005, doi:10.4271/2005-01-1860.
- Thompson, J., Op De Beeck, J., Joubert, E., and Wilhelm, T., “Case Studies of Urea SCR Integration on Passenger Cars Monitoring of Urea inside the Tank during Hot and Cold Environment Test Missions,” SAE Technical Paper 2008-01-1181, 2008, doi:10.4271/2008-01-1181.
- El-Sharkawy, A., Kalantzis, P., Syed, M., and Snyder, D., “Thermal Analysis of Urea Tank Solution Warm up for Selective Catalyst Reduction SCR,” SAE Technical Paper 2009-01-0971, 2009, doi:10.4271/2009-01-0971.
- Op De Beeck, J., Slusser, K., and Booth, N., “DEF Storage and Delivery System for Operation in Extreme Winter Conditions,” SAE Technical Paper 2014-01-1530, 2014, doi:10.4271/2014-01-1530.
- De Cesare, M., Osbat, G., Sgatti, S., and Battistoni, M., “Development of a Urea Supply System for the SCR Catalyst,” SAE Technical Paper 2013-26-0047, 2013, doi:10.4271/2013-26-0047.
- Pizzi, M., Zorzetto, M., Barbano, A., Merlano, P. et al., “A Novel Tank Heater Based on PTC (Positive Temperature Coefficient) Plastic Nanomaterial,” SAE Technical Paper 2017-01-0125, 2017, doi:10.4271/2017-01-0125.
- Choi, B., Kim, Y., Jhung, W., Lee, C. et al., “Experimental Investigation on Melting Characteristics of Frozen Urea-Water Solutions for a Diesel SCR de-NOx System,” Applied Thermal Engineering Journal, 2012, doi:10.1016.j.applthermaleng.2012.08.008.
- Choi, B. and Woo, S., “Numerical Analysis of the Optimum Heating Pipe to Melt Frozen Urea-Water Solution of a Diesel Urea-SCR System,” Applied Thermal Engineering Journal, 2015, doi:10.1016. j.applthermaleng.2015.05.055.
- Wiesche, S., “Numerical Heat Transfer and Thermal Engineering of Ad Blue (SCR) Tanks for Combustion Engine Reduction,” Applied Thermal Engineering Journal, 2007, doi:10.1016.j.applthermaleng.2007.01.008.
- Heywood, J., Internal Combustion Engine Fundamentals (McGraw-Hill Book Company, 2005), 586-642.