A boiler operates at 20 bar pressure and produces steam with a dryness fraction of 95%. Water enters the boiler at 40°C. Determine: i. The temperature of the steam exiting the boiler ii. The specific enthalpy of the water entering the boiler. iii. The specific enthalpy of steam exiting the boiler. marks) iv. The heat energy provided by the boiler. v. If 8000kg of steam is produced per hour, determine the power rating of the boiler. Put your answer in MW. vi. If the steam is then passed to a superheater, determine the heat needed per kg to heat the steam to 300°C. vii. The specific volume of the wet steam and of the superheated steam.
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Dry Steam: The Importance of the Steam Dryness Fraction | TLV - A Steam Specialist Company (Worldwide
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Calculating the Total Heat of Wet Steam
- X = Dryness (% / 100)
- νf = Specific Volume of Saturated Water.
- νg = Specific Volume of Saturated Steam.
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Dryness fraction of steam(x):
Ratio of mass of dry steam to the summation of the mass of dry steam and mass of water vapour in the mixture.
where mg = mass of dry steam, mf = mass of water vapour
Calculation:
Given:
mg = 50 kg, mf = 1.5 kg
= 0.97
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