原油加热炉在变工况下运行会严重降低效率。
Operating under variable conditions will affect the efficiency of the crude oil heater seriously.
结果表明，由该方法所建立的模型能够准确地描述变工况下滚动转子式压缩机容积效率等性能参数。
The results compare well with previous experimental data and can describe accurately the performance of compressor under variable conditions.
同时对于变工况系统中掌握好经济器的投入时机可有效提高运行效率，达到经济运行的目的。
At the same time, the purpose to improve operational efficiency effectively and to achieve economical operation can be attained under grasping the input opportunity of the economy device in...
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