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Thread: Flash Gas
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12-12-2007, 02:58 AM #1
Flash Gas
How do I calculate the mass flow of vapor being produced by flashing NH3 from a HPR to a Flash Tank?
I know I need 1482 lbs/hr of 25°F liquid to send to the LPR so I need 1482 lbs/hr of 90°F liquid + flash gas to send to the Economizer from the HPR. The economizer suction will see 767 lbs/hr from the low temp. evaps + this flash gas. I'd like to be able to calculate it by hand.
Not worried about defrosting at this point.
Steve
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20-12-2007, 01:31 AM #2
Re: Flash Gas
By my calculations... 228.4 lbs/hr.
Always ask yourself, how much energy does it take to cool 1482 lbs/hr of liquid ammonia from 90 to 25?
Now that you know the ammount of energy you need. Then ask yourself, how much mass of ammonia would i need that would absorb this ammount of energy from a phase change from 90 degrees F liquid to 25 degrees F vapor.
Simple problem if you break it down.
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