56-3水蒸气的定压发生过程 631P= constant(压力p是定值) t<t。t=tt=tt=tt>t s 未饱和水饱和水饱和湿蒸汽饱和干蒸汽过热蒸汽 p<p’y=p,pp<p”v=pv>y h<hh=h,hh<h”h=h”h>h s<s,s=g,s<s<s”s=s”s>s” 水预热 汽化 过热
§6-3 水蒸气的定压发生过程 t < ts t = ts t = ts t = ts t > ts v < v’ v = v’ v ’< v <v’’ v = v’’ v > v’’ 未饱和水 饱和水 饱和湿蒸汽 饱和干蒸汽 过热蒸汽 h < h’ h = h’ h ’< h <h’’ h = h’’ h > h’’ s < s’ s = s’ s ’< s <s’’ s = s’’ s > s’’ 水预热 汽化 过热 6.3.1 P=constant (压力 p 是定值)
Preheat Stage(预热阶段) Compressed liquid to saturated liquid (未饱和液体—饱和液体) Compressed liquid/ subcooled liquid is not about to vaporization (p) t<t=f( △过冷=1s-t It becomes Saturated iquig11 When t=ts As heat added t 1 slightly The liquid is about to vaporize. It is the state at which it is still a liquid, but any heat addition will cause some of he liquid to vaporize
Preheat Stage (预热阶段) Compressed liquid to Saturated liquid. (未饱和液体 饱和液体) Compressed liquid/subcooled liquid is not about to vaporization. As heat added, t slightly . When It becomes Saturated liquid. The liquid is about to vaporize. It is the state at which it is still a liquid, but any heat addition will cause some of the liquid to vaporize. t t f ( p) s = v v s t = t s = − t t t 过冷
Vaporization Stage(气化阶段) Saturated liquid to Saturated vapor (饱和液体 饱和蒸气 Saturated vapor is a vapor about to condense A substance at state between Saturated liquid and saturated vapor is called Saturated liquid-vapor mixture/wet Vapor. Latent heat of Vaporization(气化潜热)The amount of energy absorbed during vaporization
Vaporization Stage (气化阶段) Saturated liquid to Saturated vapor (饱和液体 饱和蒸气) Saturated vapor is a vapor about to condense. A substance at state between Saturated liquid and Saturated Vapor is called Saturated liquid-vapor mixture/wet vapor. Latent heat of Vaporization (气化潜热):The amount of energy absorbed during vaporization v s v t = t