Saturated steam and superheated steam
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When 10 kilograms of saturated steam is heated from 160 to 380 degrees, turning into superheated steam, does the pressure increase accordingly?
This post was last edited by ylb913 on 2015-6-13 10:09. 1. Saturated steam at 10 kg is not at 160 degrees. We often say that the saturation temperature of 10 kg of steam is 179 degrees; this applies to steam under an absolute pressure of 10 kg. The temperature of 10 kg of steam at gauge pressure is 184 degrees. 2. The pressure does not increase after overheating; without any pressure-raising equipment, the \"driving force\" for its backward flow is 10 kg. Due to pressure loss during flow, the pressure can only decrease, not increase.
The pressure of superheated steam seems to be lower than that of saturated steam
There is a corresponding relationship between the temperature and pressure of saturated steam; when the steam temperature is higher than the saturated steam temperature at that corresponding pressure, it is superheated steam. It’s superheated steam; the pressure won’t increase....
If the volume remains unchanged, the pressure must increase. If the volume changes, it’s not necessarily the case.
With all other conditions unchanged, the pressure should decrease, resulting in a pressure loss.
Is it still called superheated steam when the pressure increases? Of course, if it is artificially increased, as long as it does not exceed the saturation pressure at the corresponding temperature, it can be called superheated steam
If the volume changes according to the PV equation, it is still saturated steam, not superheated steam. Only when the pressure remains unchanged, or decreases, or increases by less than the amount corresponding to the saturated steam at that temperature, is it superheated steam