# Homework Help: Steam Generator problem

1. Feb 5, 2012

### sawhai

Thank you
1. The problem statement, all variables and given/known data

cold water enters a steam generator at 20°C, is vaporized at 165°C, and exits as a superheated vapor at 350°C. The steam generator, operates at constant pressure.
(a) the heat input to the generator (kJ per kg of steam product);
(b) the fraction of the input heat used to
(i) preheat the liquid feed water to the saturation temperature of 165C
(ii)evaporate the water
(iii)superheat the water vapor to its final exit temperature
2. Relevant equations
Ein=Eout

3. The attempt at a solution
I am not sure where to start. I was trying to set up the energy balance equation but since there is no pressure given I don't know how it looks like.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Feb 5, 2012

### Redbelly98

Staff Emeritus
The water becomes vapor at 165 C. At what pressure does that happen?

3. Feb 5, 2012

### sawhai

The equivalent pressure is 700kpa

4. Feb 6, 2012

### Redbelly98

Staff Emeritus
Sorry about the delay getting back to you.

Yes, the processes happen at 700 kPa. So can you use the water data tables to get the heat inputs for the 3 stages?

p.s. I'm moving this thread to the Engineering homework area, it seems like a question you would get in an engineering class rather than introductory physics.