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March 3, 2015

March 3, 2015

Posted by **Angel** on Sunday, September 18, 2011 at 11:42pm.

(a) Calculate the expected water temperature at 5-minute intervals for the first 60 minutes after the flow of cold water is established

( I have no idea how to solve this problem am completely lost on the equation use and everything please help)

- Excel Problem -
**DrBob222**, Monday, September 19, 2011 at 12:24amheat lost by hot water + heat gained by cold water = 0

initial volume = 3000 L

30 L/min x 5 min = 150L

[mass cold water x specific heat x (Tfinal-Tinitial)] + [mass warm water x specific heat x (Tfinal-Tinitial)] = 0

You know mass cold water (150L = 150kg

You know specific heat water

You know initial T of warm water = 46 C

You know initial T of cold water = 1.7 C.

The only unknown is Tfinal. You can calculate that at 0 min = 46 C

First 5 minutes given by above equation. The next 5 min interval is done the same way.

- Excel Problem -
**Angel**, Monday, September 19, 2011 at 12:55amthe formula giving was T= Tin. - (Tin. - Tint.)e (-v/v)

Where Tin = 1.7 degrees C

and Tin is the to the temperature of the cold water flowing into the tank

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