Application of phase change materials to enable the cold weather operability of B100 in diesel trucks
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Date
2017
Authors
Nnaemeka, Obiajulu
Journal Title
Journal ISSN
Volume Title
Publisher
The Canadian Society for Bioengineering
Abstract
The use of B100 biodiesel for compression ignition engines during the winter poses a challenge due to gelling and plugging of engine filters and fuel lines. The most common method to prevent this issue is blending it with petroleum diesel and many engine manufacturers limit the biodiesel in blends to 20% or less for warrantee purposes; as low as 5% may be set for winter months. In this research, an experimental analysis is performed using a scaled model of the fuel tank with canola oil as a test fluid in the tank. The tank is subjected to an ambient temperature of −20℃ in an icing tunnel facility with air velocity at 10 m/s. The results show that the time for the oil to drop from 20℃ to 5℃ was increased from 18.6 hours to 22.5 and 33 hours respectively when 4 and 12 tubes containing phase change materials (PCM) were inserted in the tank containing 33 litres of canola oil. A numerical model was further formulated to predict the transient temperature of the oil and comparison with experimental results showed excellent agreement. ANSYS Fluent was then used to conduct a visualization study of the flow for a sample scenario of a commercial tank with PCM. Finally, the developed numerical model was used to simulated different cases to investigate the effect of tank filling level, overall heat transfer coefficient, number of PCM modules and diameter of PCM modules on the tank performance. Results show that B100 can be implemented in diesel engines in cold climates.
Description
Keywords
Biodiesel, phase change material, PCM, diesel trucks, cloud point, latent energy storage, thermal energy storage, heat transfer, storage tanks
Citation
Nnaemeka, O. and Bibeau, E. “Turning winter into summer: operating a truck with B100 biodiesel all year round in cold regions. CSBE/SCGAB Annual Conference. CSBE17-049: pp. 1-11. Winnipeg, MB. August 6-10, 2017.