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Anonymous Poster #1

Enthalpy Differences

03/01/2012 2:21 AM

How heat transfer occurs in cooling towers though enthalpy remains constant below 50 degree centigrade as in moiler diagram and unless untill enthalpy differences heat will not transfer.
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Tornado
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#1

Re: Enthalpy differences

03/01/2012 2:44 AM

You are not tracing the Mollier diagram correctly, or maybe you are using a Mollier diagram where a psychrometric chart is needed.

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dhayanandhan
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#2

Re: Enthalpy Differences

03/01/2012 11:54 AM

Dear Mr. Anonymous Poster #1

Your question is NOT clear.

What I understand from your question is - how much heat will be removed from the hot water of 50 Deg.C entering the Cooling Tower.? If you confirm my understanding your question is CORRECT, then you should do the following.

First measure the WET BULB Temp. of atmospheric air, 100 Metres away from the Cooling Tower.

Take the PSYCHROMETRIC CHART (NOT MOLLIER CHART) and find out how much water vapour will be absorbed by the air entering the Cooling Tower and this fraction of water multiplied by 540 KCal. will be the heat removed from the hot water - since Latent heat of steam is 540 KCal./Kg.

The heat from the hot water is transferred to the air passing through the cooling tower which will be saturated or near saturation.

DHAYANANDHAN.S
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Codemaster
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#3

Re: Enthalpy Differences

03/01/2012 1:15 PM

It's temperature difference that causes heat transfer.

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dhayanandhan
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#5
In reply to #3

Re: Enthalpy Differences

04/23/2013 4:46 AM

Dear Mr. Codemaster,

In the Cooling Tower, it is EVAPORATION of WATER that causes the COOLING of WATER and not by Temp.Difference. In this process, air entering the Cooling Tower, gets saturated or reaching near to Saturation.

DHAYANANDHAN.S
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Crabtree
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#4

Re: Enthalpy Differences

03/02/2012 5:25 PM

Apey One - you're speaking French almost as well as I do....

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