What is meant by degree of superheat?

Answer 1

First of all, the term "superheated" generally refers to a vapor. This explanation refers to superheated vapor only.

Superheat is the difference (in degrees of temperature) between a liquid's boiling point and the superheated vapor's actual temperature.

For example; at sea level, the boiling point of water is 212ºF. As long as the temperature is 212ºF, you will have both liquid and vapor present. If you continue to add heat to the liquid/vapor mix, all the liquid will eventually become vapor. Additional heat added after no liquid remains will begin to increase the temperature above 212ºF. This resulting vapor is superheated.

If you measure the temperature of water vapor to be 220ºF at 1 ATM, the vapor is superheated by 8ºF.

The same analysis is true for any liquid/vapor, at any pressure and for any other temperature scale. i.e. R22 refrigerant is "saturated" (meaning both liquid and vapor are present) at 32ºF and 58PSIG. If you measure the pressure of R22 at 58PSIG but measure the temperature at 45ºF, you have measured 13 degrees of superheat.

I hope this answer is useful to you.

Bama Cracker

Degree of superheat is the difference between the superheated temperature and the saturated temperature of the steam .

Answer 2

Super heated generally refers to vapor. Super heated gas usually contains about 10 degrees of super heat in the gas.

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I'm afraid you've muddled heat and temperature, for a start. A fluid cannot "contain" a number of degrees, but may be at that number of them. This is because degrees measure temperature, the intensity of heat, which is a form of energy hence measured in Joules.

A superheated vapour is one whose temperature has been raised above the evaporation temperature at the pressure at which the liquid evaporated. The "usually" phrase is meaningless: superheating can raise the vapour's temperature by far more than a mere 10º - whether Celsius or Fahrenheit degrees!

Answer 3

For example : if you want to product high steam pressure with temperature 310 C. but the real temperature is 320 C, so must be decreas less than 310 C by a device which name superheater.

there are many ways to decreas the Temp. For example make the steam through water which it Temp. 120 C to make heat exchange with steam before the water go inside boilers.

I hope that a correct answer and simple.

zaid alruwaili