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Old Aug 8th 2017, 07:56 AM   #1
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Join Date: Aug 2017
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Help for exercises?

Hi folks.

I need help for following questions, could you please help me. They are a part of exercises I must return by Sunday 13th August.

1) Pressure of steam is 60 bar and its temperature is 510 C and mass flow 50 kg/s. How much 180 C water must be used in order to reduce the steam temperature to 460 C?

2) The mass flow of water used for power plant boiler is 100 kg/s, its temperature is 100C and pressure 100 bar. How much is the P in order to heat the water into boiling point? How much additional P is needed in order to vaporize and further super heated into 530 C?

3) Saturated liquid water is transferred from pressure 20 bar to 2 bar. How many per cent of water will be vaporized? What is the water temperature before and after the pressure change? Enthalpy of water remains the same.

EDIT

Questions 1 and 3 done. Still help needed for Q2.

Thanks!

PS. Sorry for any grammatical or terminology mistakes, I haven't used this vocabulary in years. These exercises are a part of 8 in total, of which half is already done.

Last edited by Chemicalengineer; Aug 8th 2017 at 12:59 PM.
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