The influences of the internal irreversibility and the high-low temperature ratio in isobaric process on the optimal performance of the system are revealed.

同时揭示了内不可逆性及等压过程高低温比值对系统优化性能的影响。

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But total pressure loss increases with the increasing of the velocity difference accompanied with the increase of the density and the static temperature ratio.

但速度差随密度比、静温比增大而增大时总压损失亦随之增大。

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The system efficiency, cooling or heating efficiency, residual heat efficiency on CCHP in different seasons are analyzed through changing heat recover ratio, temperature ratio and pressure ratio.

通过改变微燃机回热度、温比、压比，分析了不同季节联供系统的系统效率、制冷或供热效率、微燃机发电效率、二次余热回收效率的变化；

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But until recently they have suffered from a low power-to-weight ratio, unlike the other sort of room-temperature fuel cell, the temperamental and costly proton-exchange-membrane device, which several firms hope soon to use in motor cars.

ECONOMIST: Clean living in Iceland