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Bare Tube Evaporator/Prime Surface Evaporator

Bare Tube Evaporator/Prime Surface Evaporator

Bare Tube Evaporator/Prime Surface Evaporator

Hi.... I am working on two projects but struck with Evaporator Length. Needed help to go through that ones.

1. I need to Cool 3,000 Liter of Water from 35'C to 15'C but immersing Cooper Coil into Water. R 134A will be used as refrigerant.
2. 2mm thickness,500L SS 304 Tank that contains milk and want to cool it to 4'C from 20'C. Copper tube has to wrapped around the tank for this purpose.

For both, want to calculate the length and size of bare copper tube evaporator.

RE: Bare Tube Evaporator/Prime Surface Evaporator

WOW. So much info still missing..

Is this a student question?

Do you need to cool this down over six months or 8 minutes?

Are these tanks insulated?

What is the ambient temperature.

The very first thing you need to do is figure out how much energy is in the liquids at the start of the cooling. That calc includes the liquid quantity, what liquid it is, and its starting temperature. This gives the energy content.

Then you need the time to cool it.

Only then can you assess what rate of cooling you have to have.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Bare Tube Evaporator/Prime Surface Evaporator

Thanks itsmoked!!! No it is not student question. That is I'm really going to make for a client.
Vertical Milk Cooling ( 500L of Milk from 20 to 4'C)

The time to cool milk in Milk Cooling Tank is 150 minutes.
Inner Shell Diameter = 250 mm ;
Thick of Shell = 1.5 mm;
Height of Tank = 1000 mm
Top End is Flat with Lid
Bottom End is Cone with 200 mm Height.
Insulation of PU Foam = 60 mm
SS 304 Cladding Thickness = 0.4 mm
Vertical Water Cooling ( 3000L of Water from 35'C to 15'C)

Time to Cool water is 240 minutes
1000 Gallon FRP (Fiber Reinforce Plastic) Tank with 50 mm of Flexi Rubber Insulation.
Bare tube evaporator is to immerse directly into water.

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