14 replies to this topic

[norbert90]

Hello,

 

I am trying to design an induced draft cooling tower that is able to cool 1000 m³/h from 33°C to 29°C at 26°C wet bulb T.

In order to calculate the required area for this tower, I need to choose a water loading factor (m³/h.m²); anyone have an idea how to get this number and based on what ?

 

Thanks in advance.

[breizh]

norbert90,

 

Let you consider the resources attached.

Hope this helps

 

Breizh

[ADITYA.DUBEY]

Dear all

 

I had asked a vendor to supply a cooling tower to cool the water supply of 20 m3/hr(5283 gallons/hr)  from 60 Deg C (140 F) to 35 Deg C(95 F) . Wet bulb temp is 28 Deg C(82.4 F).

According to my calculation total heat transfer requirement will be 165 Ton of Refrigeration(TR).

But vendor is supplying only 55 TR capacity cooling tower and saying it is sufficient for the purpose  and giving below justification.

 

Heat rejection rate = 500000 Kcal/hr = 165 TR

However a coefficient of Range-Approach =0.3 will be applied thus requirement = 55 TR.

 

I am unable to find any coefficient like that anywhere.

Range= 25 Deg C (45 F)

Approach = 32 Deg C (57.6 F)

Have anyone come across like such problem??

 

 

Thanks

Aditya

 

[shantanuk100]

Dear Aditya,

 

Please post your calculation here too alongwith the final value.

Then we can compare the vendor's value and see where you or he might have been different.

 

Regards,

Shantanu

[breizh]

Hi aditya ,

Consider the resources attached to support your work.

Hope this helps

 

Breizh

[56200358]

Hello

how can i select the type of cooling tower make up? RO or pretreatment water or raw water(river-sea water)? what type of water is usually used?

(I know fundamentals of cooling tower such as COC,....)

[breizh]

Hi ,

The type of the water is defined based on  metallurgy of the equipment , the availability and the treatment in place . I would advise you to contact a reputable vendor of chemical treatment for cooling water .This guy will perform tests on different samples provided . Economics should be the driver ( water consumption (blow down) / chemical cost/ equipment ,,,,)

 

Hope this helps

Breizh

[Chemical.Engineer]

Hello

i want to redesign cooling system for a existing wet cooling tower with less flow than before.

 

1- for available cooling tower(the cooling tower has been constructed), how can i calculate L/G?

 

2- if i want to simulate a dry cooling tower, what are the minimum and optimum approach in dry cooling tower?

[breizh]

Hi ,

For point 1 , the only thing you need to consider is to work on the electrical power consumption , using a VSD for the fan(s) . For the pumps , probably better to redesign . 

Make sure that the water distribution is correct in the cooling tower to prevent scale formation and packing to collapse .

 

For L/G  calculation take a look at post #2

 

For point 2 , define your requirement and discuss with the vendor .

 

my view.

 

Breizh

Edited by breizh, 08 August 2016 - 01:26 AM.

[56200358]

Hello

i want know minimum velocity for line sizing in cooling towers loop. Shall we consider velocity critria for cooling water or suction and pump discharge?if we shall use cooling water critria, how much shall we consider?i have seen minimum velocity 1 m/s also 8 ft/s in another reference for cooling waters.which one is true(please introduce reference)?soft water is used for this loop.

Thanks

[breizh]

Hi ,

Let you try your best Friend Google or other engine , key words : Cooling water pipe velocity .

 

Good luck

 

Breizh

[Johns923]

Breizh,

 

the links in your file titled "Cooling Tower Thermal Design" do not work. Do you by any chance happen to have an updated link to the associated examples?

 

Thank you!

 

John

[breizh]

Hi John,

Just a PDF !

let you try Google or your favorite engine .

Breizh

Edited by breizh, 21 September 2017 - 11:26 AM.

[Takechi]

Dear Breizh or every one

 

Could you please share spreadsheet in Cooling tower thermal design.pdf to me.

 

I try to download these spreadsheet but I cannot.

 

Salapao

[breizh]

Good day all ,

I cannot offer better and you need to perform calculation using the examples attached .

 

another good resource with software is : APPLIED INDUSTRIAL ENERGY AND ENVIRONMENTAL MANAGEMENT from Z.K Morvay

 

Breizh

Edited by breizh, 30 September 2017 - 06:18 AM.