关系结果说明随着煤价增加，最佳初始温差值减小，最小年总费用增大；
Graph shows: with the increase in coal prices, the best ITD value decreases, the minimum total annual cost increases;
影响其背压的主要因素有：大气环境温度、空冷初始温差、凝汽器的端差。
The major factors effecting on the backpressure include atmospheric environment temperature, primary temperature difference of air-cooling, end difference of condensers.
随着成本电价的增加，空冷系统年总费用增加，最佳初始温差值也随之变大；
With the increase in the cost of electricity, the total cost of air-cooling system increases, the best ITD value also increases;
初始换热温差ITD值的优化是直接空冷电站设计过程中较为关键的部分，关系到整个电站设计是否经济、合理。
The optimization of Initial Temperature Difference (ITD) is the relatively key part in the process of the design of the direct air cooling power station.
结果表明：初始时刻叶片表面和环境温差较大，温降较快，随着冷却过程进行，温降速度变缓；
The results show that the temperature reduces fast at first stage, because of the larger difference between blade and air. Then, the temperature reduction rate decreases slowerly, in cooling process.
结果表明：初始时刻叶片表面和环境温差较大，温降较快，随着冷却过程进行，温降速度变缓；
The results show that the temperature reduces fast at first stage, because of the larger difference between blade and air. Then, the temperature reduction rate decreases slowerly, in cooling process.
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