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Q: Will superheated steam will of necessity contain a small amount of moisture?
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What is the difference between saturated steam and Superheated steam?

Saturated steam occurs when steam and water are in equilibrium. If you have a closed container of water and heat it, above 100 celsius the steam pressure will start to rise, and as the temperature continues to rise, the pressure will go on rising. What is happening is that steam is being evolved to match the temperature (steam tables will give this relation) and the steam conditions are said to be saturated because if the pressure is raised by external means, some of the steam will start to condense back to water.If the steam pressure is held at a lower level than that achieved at saturation, by taking steam off to feed a turbine or other steam usage, there is effectively an excess temperature for that pressure, and the steam is said to be superheated. It in fact then becomes dry, and behaves as a gas. The amount of superheat can be quantified as so many degrees of superheat (celsius or fahrenheit).Turbine designers want steam to be superheated before reaching the turbine, to avoid condensation causing blade erosion, and steam producing boilers in power plants are designed to produce superheated steam. In plants where no turbines are used, only satured steam is normally generated.In heating applications, saturated steam is preferable, because it has a better energy exchange capacity. Superheated steam must cool down, and become saturated steam, before condensing in a heat exchanger. Also, superheated steam is a thermal insulator, like air.That is why it is necessary to direct superheated steam through a desuperheater before using the steam in heating applications.


Why is heat trasnfer coefficient of saturated steam is higher than superheated steam?

when steam is at its saturation point for a given pressure, any heat removed will cause liquid water to form. So when saturated steam is used to heat something else, the heated object/substance receives the condensation heat of the steam. The latent heat of condensation/evaporation is 970 But/lb @ 0 psig. On the other, superheated steam only gives up about 10 BTU/lb if it is cooled 20 degrees F. That means that much more steam would be used to transfer the equivalent amount of heat. The liquid water interface also improves the heat transfer.


Why aluminum parts should not be in contact of concrete?

I believe that Concrete is naturally acidic so if any moisture of -any- amount gets in contact it will eat at the aluminum. It's not really a question of IF it will degrade it's just a matter of how fast it will degrade.


How do you dry N O-dimethylhydroxylamine hydrochloride?

The hydrochloride salts are very easy to absorb moisture, and they are generally sealed with parafilm. If large amount, you can dry the chemical N,O-dimethylhydroxylamine hydrochloridewith rotary evaporator, equipped with an oil pump. The chemical will will dry faster and evenly. If small amount, just use an oil pump at at room temperature.


What is warm rolling of steam turbine?

You don't start a large turbine cold. Typically, the lubrication system is started, the turning gear is engaged and warming steam (a small amount of steam, not enough to turn the turbine) is admitted to the turbine to warm and initially expand the shaft and casing. If this isn't done, thermal shock from the admission of high pressure superheated steam into the cold turbine could damage it.

Related questions

When cookies and bread are together why don't they suck an equal amount of moisture fro each other?

because they are dry products they dont contain alot of moisture


What does sling psychomotor measures?

A sling psychrometer can be used to find relative humidity, which is expressed as a percentage. It is computed by multiplying the amount of moisture in the air at a given temperature, dividing by the maximum amount of moisture the air could contain at that same temperature, and then multiplying the quotient by 100.


What term is used to measure the amount of moisture?

Humidity is the term used to measure the amount of moisture in the air.


Why are there planets?

Planet exist because the amount of matter is not large enough or not made of superheated hydrogen to become a star.


How does temperature influence the amount of moisture in the atmosphere?

the higher the temperature, the more moisture.


Amount of moisture in the air?

humidity.


What is the amount of the moisture in the air?

that is the humidity


What is is the variable in this study?

amount of moisture!


Which is the comparison of the amount of moisture in the air to the amount of moisture it can hold?

relative humidity


What is the meaning humidity?

The amount of moisture in the air.


Amount of moisture in the air is called?

humidity


As the dew point temperature of a sample air decrease the amount of moisture in that saple of air?

The moisture decreases.