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## 效率

${\displaystyle \eta ={\frac {|W|}{|Q_{hot}|}}}$

${\displaystyle \eta ={\frac {|Q_{hot}|-|Q_{cold}|}{|Q_{hot}|}}}$

• ${\displaystyle \delta }$ 表示變化量

• ${\displaystyle \delta S=0}$

${\displaystyle {\frac {|Q_{hot}|}{T_{hot}}}={\frac {|Q_{cold}|}{T_{cold}}}}$
${\displaystyle \eta _{C}={\frac {|Q_{hot}|-|Q_{cold}|}{|Q_{hot}|}}=1-{\frac {|Q_{cold}|}{|Q_{hot}|}}}$

${\displaystyle \eta _{C}=1-{\frac {T_{cold}}{T_{hot}}}}$

${\displaystyle {\frac {Q_{hot}}{Q_{cold}}}\leq {\frac {T_{hot}}{T_{cold}}}}$

${\displaystyle \eta \leq {\frac {T_{hot}-T_{cold}}{T_{hot}}}}$ [1]

## 熱機的熱力過程

(壓縮)

(加熱)

(膨脹)

(冷卻)
Notes

Lenoir循环英语Lenoir cycle 等壓 等容 絕熱 脉冲喷气式发动机

## 参考文献

1. ^ 参考
• Robert A. Ristinen/ Jack J. Kranshaar Energy and the Environment:2nd Edition.（John Wiley & Sons, Inc; 2006）

## 參見

This article uses material from the Wikipedia article "热机", which is released under the Creative Commons Attribution-Share-Alike License 3.0. There is a list of all authors in Wikipedia