Research on Solar Thermal Energy Warming Diesel Engine Based on Reverse Heat Transfer of Coolant 2020-01-1343
In winter, the temperature of the coldest month is below -20℃.Low temperature makes it difficult to start a diesel engine, combust sufficiently, which increases fuel consumption and pollutes the environment. The use of electric power-driven auxiliary heating system increases the battery load and power consumption. Solar thermal energy has the advantages of easy access, clean and pollution-free. The coolant in the cylinder block of the diesel engine has a large contact area with the cylinder and is evenly distributed, which can be used as a heat transfer medium for warming up. A one-dimensional heat transfer model of the diesel engine block for the reverse heat transfer of the coolant is established, and the total heat required for the warming up is calculated by an iterative method in combination with the warming target. According to this, the matching calculation of the parameters and the establishment of the structural feature model of the heat storage device, the heat transfer element, and the solar collector are completed. The heat energy collected by the solar collector is stored in the heat storage device through the heat transfer element. Before the ignition of the engine, the heat energy in the heat storage device is released to heat the coolant. Then, the coolant is circulated between the cylinder block and the heat storage device to warm up the diesel engine. The results show that the temperature of the diesel engine can be more than 5℃ higher than the ambient temperature after the engine is warmed up. This scheme can improve the temperature of the diesel engine when starting and provide reference for solving the problem of diesel engine starting in cold areas with abundant sunshine.
Fangyu Zhou, Gangfeng Tan, Mi Zhou, ZhiQiang Liu, Philip Agyeman
Wuhan University of Technology, Suizhou-WUT Industry Research Institute