为提高燃气机热泵的火用效率，应选用效率高的燃气发动机。
The gas engine with higher efficiency should be selected to raise the exergy efficiency of gas engine-driven heat pump.
热效率和火用效率达不到设计值的原因，一是排烟温度超过设计值，二是空气系数偏高。
The low efficiency is caused by the rejection temperature exceeding the design value and the high air coefficient (oxygen content).
本文建立了喷流式换热器的火用效率计算模型，并通过实例计算，分析了各运行参数对喷流式换热器火用效率的影响。
The paper founded the efficiency computing model of jet heat exchanger and analyzed the effect of operating parameters on efficiency of jet heat exchanger by the calculation of examples.
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