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 Author Topic: Help needed !!!  (Read 12605 times) 0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
Newbie

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 « Embed this message 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!
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Fu-Kwun Hwang
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 « Embed this message Reply #1 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)

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 « Embed this message Reply #2 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
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Fu-Kwun Hwang
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 « Embed this message Reply #3 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.
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 « Embed this message Reply #4 on: December 13, 2007, 10:53:46 am »

Yes, i was able to find P2

 « Last Edit: December 13, 2007, 10:55:49 am by vadik » Logged
HUMSHAPHY
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 « Embed this message Reply #5 on: November 08, 2009, 11:44:23 am »

Thanks alot for your help I really appreciate it. I was confused by the name programmable shaders. Thanks too the readme and your answer I finally could configure Hellforces. I like the game very much.
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"Make priority, take action and start now." ...Wisdom