Steam

If steam tables are not available, gas law says:

specific volume= R*T/P*MW, where

R=0.0821 liters*atmospheres/mole*°K

MW=18 (molecular weight of steam)

Actual conditions: 8 absolutes atmospheres pressure, 573 °K temperature

then specific volume=0.326 cubic meters/kg

My Friend,

There must be a mistake. May be it is meant 300°F, and not 300°C.

For 300 °F, the pressure will be approximately 5 bar, and the steam specific volume will be approx. 0.39425 m³/kg.

While, at an elevated temperature of 300 °C, the pressure will be approx. 85 bar, and the steam specific volume will be 0.0216667 m³/kg.

On the other hand, if we consider the 7 atmo. pressure that you have given, which is approximately 7 bar, then the saturation temperature of steam at this pressure will be 170.513 °C, and its specific volume will be 0.239992 m³/kg

Please refer to this link http://www.spiraxsarco.com/resources/steam-tables/saturated-steam.asp

At 300degF and 7 barg, H₂O is water, then, and not steam. At 145degC, water has a volume of 0.001085m3/kg. At 150degC, water has a volume of 0.001091m3/kg.

Dear Friend.

How can it be??!. Water will turn steam at 300 degF(149 deg C). please refer to steam tables to find that at this temp. steam will have a pressure of approximately 4.7 bar, and specific volume as mentioned before.

Thanks.

<....How can it be....>

The boiling temperature at 7barg is 170.5degC. So it will be water at 7barg and 149degC. Look:

http://www.simetric.co.uk/si_steam.htm

YOU ARE RIGHT. AT 7 BAR SATURATED STEAM CANNOT BE 300C. IF IT IS 300C THEN IT CANNOT BE AT 7 BAR AND SATURATED.

I BELIEVE HIS APPLICATION IS A MAYBE A TEXTILE STEAMER NORMALLY KNOWN AS "AGER" MADE BY ARIOLI . HERE THE STEAM AT 7 BAR IS TAKEN INTO A COILED HORIZONTAL (SORT OF BOILER) ENCLOSER WITH A PACKAGED BURNER . THIS IS KNOWN AS SUPER-HEATER AND COMES AS A PART OF THE AGER. THE BURNER IS THEN FIRED AND HAS JUST I PASS & OUT THE CHIMNEY. THE STEAM IN THE COIL THEN RISES TO 300C INTO THE STEAM RADIATORS INSIDE THE CHAMBER OF THE AGER. BLOWERS THEN BLOW VIA THE RIADIATORS TO ATTAIN A CONSTANT TEMPERATURE OF 235C TO 250C. THE TEMPERATURE CONTROLLER MODULATES THE BURNER. THIS PROCESS OF STEAMING/AGER IS ONLY AFTER PRINTING WHERE THE CLOTH PASSES INTO THE STEAMER/AGER FOR THE DYES TO GET PERMANENT. THIS IS WHY THE COLORS IN YOUR BED SHEETS DON'T WASH OFF.

IN SOME PLACES THEY ORDER AGER WITH GAS-FIRED SUPER HEATER AND IN MOST PLACES THEY USE THERMO OIL HEATING WHERE THE 300C HOT OIL GOES TO THE SAME STEAM RAIDATOR AND RETURNS BACK TO THE OIL BOILER. THERE IS A 3-WAY CONTROL VALVES WHICH DIVERTS THE OIL AFTER ATTAINING TEMPERATURE.

I'm curious about that too.

I believe it's called steam table.

Water and steam energy (and other data) via an Excel plug-in;

http://www.cheresources.com/iapwsif97.shtml#addin

Its embedded in an article there, too.