结果表明，提高对流传热系数是提高膜蒸馏热效率和渗透通量的关键。
It appears that improvement of convective heat transfer is very important for enhancement of flux and heat efficiency.
分析了影响管式加热炉热效率的因素，主要包括过剩空气系数、不完全燃烧、排烟温度等。
Influencing factors on heat efficiency of tubular heaters are analyzed, which mainly include excess air factor, imperfect combustion and exhaust temperature.
维持过剩空气系数在最优值附近，能够有效提高常压加热炉的热效率。
It can improve thermal efficiency effectively by keeping excess air coefficient at optimal value.
通过实验，得出了发动机转速与热泵性能系数、发动机热效率的关系曲线，并进行了分析。
Through experiment, the relation figures of engine rotation speed, coefficient of performance of heat pump and engine thermal efficiency are presented and analyzed.
过剩空气系数、排烟温度、燃料用量是影响加热炉热效率的三个主要因素。
The excessive air coefficient, flue gas emission temperature and fuel consumption are three major factors affecting the heat efficiency of the furnace.
冷凝式锅炉的热效率提高潜力主要取决于燃料种类、锅炉本体的排烟温度、工艺流体的温度、所需的低品位热能的数量、过量空气系数等。
The potential for efficiency improvement depends mainly on the fuel type fired, the exit flue-gas temperature, the process fluid temperature, the low-level heat required, and the excess air etc.
配此型燃烧器的300MW机组锅炉的热效率达到93%以上，省煤器后过剩空气系数可降至1.15。
With this type of burner, the boiler efficiency of 300mw unit has reached over 93%, while the excess air ratio after economizer is reduced to 1. 15.
针对预热器级数、漏风系数对双系列热效率的影响展开研究，其规律对新型预热器系统的开发具有指导意义。
The effects of preheater stage and air-leakage coefficient on bi-series thermal efficiency are also researched, its regular patterns are of guide to the development of new type of preheater system.
通过改变集热管进口空气流量来获得尽可能高出口温度的热空气，从而降低热损系数，提高集热效率。
Through experiments of changing the inlet air flow rate, we can adjust the hot air outlet temperature as high as possible, which helps to reduce the heat loss and improve the collector efficiency.
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).
对多喷嘴引射混合式加热器的加热性能进行了试验研究，分析了工作流体压力和引射孔结构对引射混合式加热器的出口温度、引射系数以及加热效率的影响。
The influence of the working fluid pressure and the structure of ejecting nozzle on the outlet temperature, ejecting coefficient and heating efficiency of the ejecting-mixing heater were analyzed.
提高板式换热器传热效率的关键是提高传热系数和对数平均温差。
Improve the heat transfer efficiency of plate heat exchanger is to improve the heat transfer coefficient and key logarithmic mean temperature difference.
压缩比增加，发动机充量系数增加，燃烧速率加快，热效率提高。
When compression ratio is increased, the volumetric efficiency is increased, giving a fast burning rate and thus high thermal efficiency and power output.
压缩比增加，发动机充量系数增加，燃烧速率加快，热效率提高。
When compression ratio is increased, the volumetric efficiency is increased, giving a fast burning rate and thus high thermal efficiency and power output.
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