Research on performance of liquid drive fan cooling system for hydrogen fuel cell forklift

摘要

Due to the large energy consumption as well as poor controllability and other problems, the traditional cooling system has not been able to adapt to the development needs of construction machinery with the continuous upgrading of emission regulations. This paper introduces a hydraulic driven fan cooling system based on pilot operated electrohydraulic proportional valve. In order to make the whole machine quickly reach the temperature required in the best working condition when the construction machinery starts working, controlling the fan at a lower speed can reduce the heat dissipation and save energy. The electronic control system will adjust the motor speed in time when the temperature of the fluid rises, and control the temperature in the best temperature range required. A one-dimensional simulation model of this stepless speed control system is established to predict the parameter sensitivity of the electro-hydraulic proportional valve and the dynamic performance of the system. The simulation shows that the fan speed of the system can reach the required speed in only 5s at the extreme high temperature of 40 degrees C; the fan input power of the system accounts for 65 of the system input power at-30 degrees C and reaches 80 at 40 degrees C. Three-dimensional simulation shows that the fan-front temperature-controlled cooling system for forklift truck has high heat dissipation efficiency and can be applied to other heavy machinery products. (c) 2022 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.