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JDK1.0.2 simulations (1996-2001) => Thermodynamics => Topic started by: vadik on December 11, 2007, 04:12:45 am



Title: Help needed !!!
Post by: vadik on December 11, 2007, 04:12:45 am
Hello! I am a new member on this forum..
I need help with Thermodynamics...
I have few problmes that for some reason i don't see how to solve..

Problem 1
 A closed constant volume container of air initially at 150 psia. and 200 F cools down to 60 F. Using the ideal gas model what is the final pressure?

Problem 2
An open feedwater heater takes in 1000 lb/hr of water at 250 psia and 80 F and uses mixing wit saturated steam at 250 psia to provide saturated liquid at 250 psia. What flow rate lb/hr of steam is needed. Assume no hear is lost to the invirement. Look up property values in the back of the text.


Could someone help me solving these two problems?
Thank you very much!
Vadim


Title: Re: Help needed !!!
Post by: Fu-Kwun Hwang on December 11, 2007, 09:36:01 pm
Problem 1 can be solved by ideal gas law: PV=nRT
n should be the same, R is a constant, You can find out P1, T1 and T2 from the question (with proper unit)

Problem2: Need more information from your textbook. You need to find out by yourself. ;)


Title: Re: Help needed !!!
Post by: vadik on December 12, 2007, 12:42:52 pm
In first problem V (Volume) is not given and i don't know how to find V


Title: Re: Help needed !!!
Post by: Fu-Kwun Hwang on December 12, 2007, 04:56:24 pm
Because the Volume V is the same. (n,R are also the same)
P1 V = nR T1
P2 V = nR T2

You should be able to find out P2 from the above equations.


Title: Re: Help needed !!!
Post by: vadik on December 13, 2007, 10:53:46 am
Yes, i was able to find P2

Thank you for your help!


Title: Help needed
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