Basically the problem is like this. Steam is kept at around 12 bars or 1200 kPa

Question

Basically the problem is like this. Steam is kept at around 12 bars or 1200 kPa of pressure at atmospheric temperature (27°C or 300°K). The steam is saturated and we know the vapor pressure of saturated steam around that temperature is 4.242 kPa. Now that steam is gradually heated. Now I want to know whether the steam will be kept at the same pressure at 190°C. We assume that the volume of steam remain constant. We also know that vapor pressure of saturated steam at 190°C is 1254.9 kPa i.e. higher than the pressure at which the steam is initially contained.
In conventional thermal power plants, water is pressurized to very high level in liquid state before entering the Boiler and there at that very high pressure it is converted into steam by application of heat. in short, the whole process remained isobaric.
But what will happen if the vapor is kept at comparatively lower pressure and is heated in the Boiler gradually? Does in that case too its pressure will reach the level in conventional thermal power plants Boiler pressure or the pressure will remain the same, just change in temperature will occur?

Explanation / Answer

for constant entropy T1P1(1-k)/k=T2P2(1-k)/k

if Temperature was to rise pressure would rise

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