- #1
maarjaaur
- 3
- 0
Hello,
Im new here, sorry for my english, but I am in desperate need of help regarding my own experiment which i need to finish. I need to calculate steam kg/kg (flash steam maybe in english?). Basically i have entering steam temperature and pressure and exiting steam temp. and pressure from evaporator? and i need to find ... S/W... kg/kg
I need to find basically 4 different answers all with different entering steam/water variables.
1) entering temp 100 Celsius,1atm. exiting 100C 2atm.
2)entering temp 15C, 1atm. exiting 100C 2 atm.
3)entering 0,8atm 100C. exiting 100C 2atm.
4) 15c 0,8 atm. exiting 100C 2atm.
I have tried according to these calculations but something doesn't add up.
I take info from a table where i get kJ for water at different pressure but i don't understand how does temperature change the calculations. And i get minus answer for the first variable...is it ok?
example at 1. variable
I take the formule given above and fill the blanks with steam table here: http://www.engineeringtoolbox.com/saturated-steam-properties-d_101.html
then i get minus answer and i think its false, i don't know where to calculate the temperature i have only taken the pressure and kJ-s from the table into account according to that formula. ( 417,5-504,7 / 2201,59 = - 0,0396 kg/kg )
Im new here, sorry for my english, but I am in desperate need of help regarding my own experiment which i need to finish. I need to calculate steam kg/kg (flash steam maybe in english?). Basically i have entering steam temperature and pressure and exiting steam temp. and pressure from evaporator? and i need to find ... S/W... kg/kg
Homework Statement
I need to find basically 4 different answers all with different entering steam/water variables.
1) entering temp 100 Celsius,1atm. exiting 100C 2atm.
2)entering temp 15C, 1atm. exiting 100C 2 atm.
3)entering 0,8atm 100C. exiting 100C 2atm.
4) 15c 0,8 atm. exiting 100C 2atm.
Homework Equations
I have tried according to these calculations but something doesn't add up.
I take info from a table where i get kJ for water at different pressure but i don't understand how does temperature change the calculations. And i get minus answer for the first variable...is it ok?
The Attempt at a Solution
example at 1. variable
I take the formule given above and fill the blanks with steam table here: http://www.engineeringtoolbox.com/saturated-steam-properties-d_101.html
then i get minus answer and i think its false, i don't know where to calculate the temperature i have only taken the pressure and kJ-s from the table into account according to that formula. ( 417,5-504,7 / 2201,59 = - 0,0396 kg/kg )