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各种履带式车辆、推土机和拖拉铲运机的使用日益增多,而且作业条件常常是极为严酷,这些大型柴油设备的冷却系统的工作比以往更加困难。为了评价一台建筑机械所产生的热量,假设一台225马力的履带式拖拉机的柴油机以70％的最大负荷工作,一小时內发动机产生的热量足以给一间标准房屋供暖一天半。三分之一的热变成功率,另外的三分之一由废气排走,剩余的三分之一必须由冷却系统
The increasing use of various crawler vehicles, bulldozers and haulage tractors, and the often harsh operating conditions, make the cooling of these large diesel installations harder than ever before. To evaluate the heat generated by a construction machine, suppose that a 225 hp crawler diesel engine operates at a maximum load of 70% and the heat generated by the engine in one hour is enough to heat a standard house for a day and a half. One-third of the heat becomes power, the other one-third by exhaust emissions, the remaining one-third must be cooling system