TFS problem evaporative colling

[nirvick]

Can anyone tell me what did I miss here?

 

[nirvick]

sorry it will be *cooling

 

[MikeGlass1969]

You forgot to divide by the 70%...  To get the water flow required.

I came up with (B) for the answer.  

I did my calculations differently than yours.  I have quick equations on my Psych chart here...  

 

[nirvick]

thank you

 

[Vel2018]

Ok so I have to bump this up. Have a question.

@Slay the P.E.

Can you please clarify this, because I was calculating the mass of water that was evaporated into the air, isn't it equal to mair (W4-W3)? 

Why would the mass of water evaporated be calculated like mair4W4 - mair3W3 , where mair4 was calculated at the density at point 4 which the air was already treated. 

I've check other equation and it appears that the mass of water should be equal to mair at initial state x (W2-W1)?

 

[Slay the P.E.]

Ok so I have to bump this up. Have a question.

@Slay the P.E.

Can you please clarify this, because I was calculating the mass of water that was evaporated into the air, isn't it equal to mair (W4-W3)? 

Why would the mass of water evaporated be calculated like mair4W4 - mair3W3 , where mair4 was calculated at the density at point 4 which the air was already treated. 

I've check other equation and it appears that the mass of water should be equal to mair at initial state x (W2-W1)?

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