Experimental study on heat transfer performance of heating pipeline of heavy-duty diesel engine’s lubricant tank under extreme cold condition

In order to investigate the heat transfer performance of heating pipeline of a heavy-duty diesel engine’s lubricant tank during the preheating stage under extremely cold conditions, a test platform for heat transfer performance of the heating pipeline of lubricant tank was constructed. The temperature variation law of the lubricant in the tank during the preheating process was studied, the working parameters such as coolant inlet temperature, volume flow rate and lubricant initial temperature were adjusted, and the effects of different working conditions on the lubricant temperature variation were analyzed. The test results showed that when the lubricant initial temperature was -50 ℃, its high viscosity led to a very uneven temperature distribution inside the tank during preheating with only a few temperature measuring points showing a significant increase. Increasing the inlet temperature and volume flow rate of the coolant both increased the average heat transfer power, especially the increase of coolant inlet temperature had a more significant effect on the increase of average heat transfer power. When the lubricant initial temperature to -40, -30 and -20 ° C respectively, the average heat transfer power increased first and then decreased, and when the lubricant initial temperature was -40 ℃, the average heat transfer power was maximum. The research results provide a reference for optimizing the lubricant preheating strategy and improving the structure of heating pipeline of the lubricant tank.