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SAN00
Active Contributor

Join Date: Feb 2008
Posts: 12

Cooling Tower Capacity Calculation

09/02/2011 6:31 AM

Dear Friends,

I am having much more old FRP cooling tower & not having any technical detail like, TR capacity,etc. I am using it with cooling fan having motor of 5 HP, Entering water temp- 35Deg C, Input water line dia- 6". Its shape is square type.

You are requested to help to calculate capacity of this Cooling tower. I searched on net but I cant. If you need any further information, pl tell.

Thanks in advance.
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PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: Cooling tower capacity calculation

09/02/2011 6:34 AM
  1. What is the dry-bulb temperature?
  2. What is the wet-bulb temperature?
  3. What is the flowrate?

The rest can be derived from them using a psychromatric chart.

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rajeswari
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Join Date: May 2011
Location: Chennai, TAMIL NADU, INDIA
Posts: 108
Good Answers: 1
#2

Re: Cooling Tower Capacity Calculation

09/03/2011 5:02 AM

Dear Mr. SAN00,

In addition to the data required by other CR4 Members, Pl. provide the fan dia, and speed, and if possible fan blade angle at the tip and current drawn by the motor.

What is the Temp. of water at out let of the tower.?

RAJESWARI.
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energygod
Guru

Join Date: Apr 2006
Location: Cincinnati, Ohio, USA
Posts: 662
Good Answers: 49
#3

Re: Cooling Tower Capacity Calculation

09/03/2011 9:50 AM

The simplest method of estimating capacity is comparison of fan HP.

A typical 500-Ton tower has 7,500,000 BTUH (2200 kW/hr) reject at 1500 GPM flow (~6000 LPM) with 95F (35C) EWT and 85F (48.8C) LWT with a 78F (25.5C) WB entering air. Such a tower will have a 40 HP motor.

Tower capacity is directly related to airflow, and airflow is directly related to HP.

SO- a quick estimate would yield a capacity of 5 / 40 X 500, or about 60 Tons (900,000 BTUH (265 kW/hr).

Another cross check- less accurate- is pump HP. The 1500 GPM pump would be around 30 HP, so the pump in your case should be around 5 HP with similar tower capacity.

Hope this helps.

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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
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#4

Re: Cooling Tower Capacity Calculation

09/03/2011 4:47 PM

Another way:K x (EWT - LWT) x Flow, where K is a constant depending on measurement units.

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SAN00
Active Contributor

Join Date: Feb 2008
Posts: 12
#5

Re: Cooling Tower Capacity Calculation

09/07/2011 8:10 AM

Hello friends,

Thanks for your reply.. Herewith sending more information

Dry bulb temp- 27 Deg C, Wet bulb temp.- 24 Deg C., Entering water temp.- 33 Deg C.
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coolingtowermaster
Participant

Join Date: Dec 2011
Posts: 1
#6

Re: Cooling Tower Capacity Calculation

12/19/2011 10:26 AM

i think i know answer for your question

try out ask your question here frp cooling towers (this man is truelly proffessional in this buisness) he just halped me with my case...
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coolingtowermaster (1); energygod (1); PWSlack (1); rajeswari (1); SAN00 (1); Tornado (1)

Previous in Forum: What Is the Equation that Governs the Pressure Wave Form of Trapezoidal Type?   Next in Forum: Designing Shear Bolted Joints in Fatigue Load?

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