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Associate

Join Date: Jul 2009
Posts: 34

# Cooling Tower Capacity Calculation for Milk Evaporator

08/16/2009 3:44 AM

dear guru ji

we have one evaporator with 5 effect and water evaporation capacity of 18500kg/hr

this for milk concentration may i know the capacity cooling tower in referegeration tonnage for cooling tower

sps sawhney

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Member

Join Date: Jun 2007
Posts: 5
#1

### Re: Cooling Tower Capacity Calculation for Milk Evaporator

08/16/2009 11:17 PM

Dear Mr Sawhney

To calculate the cooling tower capacity, more information on the system in terms of evaporation per stage, evaporation conditions like vacuum in stages and type of preheater in use would be required.

Normally, for rough calculatins, at the maximum, its the heat load in the last calanderia generated in terms of vapour that you could consider as the equivalent refregration capacity

Sanjiv

Associate

Join Date: Jul 2009
Posts: 34
#2

### Re: Cooling Tower Capacity Calculation for Milk Evaporator

08/16/2009 11:32 PM

dear sir

thanx for your reply the vapours to condenser from last effect shall be 1600kg/hr

temp shall be around 50c

Guru

Join Date: Jun 2008
Location: Oman
Posts: 612
#3

### Re: Cooling Tower Capacity Calculation for Milk Evaporator

08/17/2009 6:00 AM

To decide the capacity of cooling tower you have to understand the concept of heat rejection ratio. ( HRR). The loading on the condenser per unit refrigeration is known as heat rejection ratio. Water cooled condensers are used in conjunction with cooling tower. As a thumb rule the heat rejection ration varies form 1.25 to 1.35. You can check your condenser capacity my multiplying the T.R with HRR and accordingly select the cooling tower capacity.

Member

Join Date: Jun 2007
Posts: 5
#4

### Re: Cooling Tower Capacity Calculation for Milk Evaporator

08/18/2009 2:56 AM

Dear Mr Sawhney

Normally milk fed to the evaporator is in refregerated condition i.e at low temperature. This is heated in the preheater The energy transfer will be from the 1600 kg/hr of vapour coming and latent heat released due to condensation of this vapour. Depending upon the design of the preheater, part condensation of vapours will occur and the balance will be the load on the condensor.

This would determine the size of cooling tower.

For more details you could communicate with me on acmefil@mtnl.net,in

Sanjiv

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