Question re: secondary refrigerant

[Ober]

Does the salinity level of a brine solution used as secondary refrigerant in an ice plant, affect the freezing time of H2O to ice? Anyone who can shed light on this? Thanks in advance!

[Ober]

Does the salinity level of a brine solution used as secondary refrigerant in an ice plant, affect the freezing time of H2O to ice? Anyone who can shed light on this? Thanks in advance!

I'm referring to the freezing time of the block ice.

[michaelm]

B"H
Ober,
Any salt dissolved in water will depreciate freezing point. The higher the concentration of the salt in the brine the lower is the freezing point of the brine. Of course to freeze the brine to a lower temperature more energy needed to be with drowned and it will take a longer time. At 0% salt freezing point 32F, 5%salt freezing point @ 26.8F, 8% salt freezing point @ 23F

[IceMan_4000]

Hi Ober

Let us consider the SP gravity of the secondary solution.
As the strength or salt level is increased within the secondary solution a couple major things happen. the Specific Gravity increases causing pump capacity to drop and horse power required to increase.

with this the solution also gains the ability to perform at a lower temperature.

As long as your system can handle the increased pumping capacity and your coils can handle the increased TD across them.

You should in theory be able to decrease you freezing time.

Things to be aware of.

Pump amperage will increase due to the increased SP.G

Be aware of your compression ratio as you lower the suction pressure this ration is going to increase dramatically. To much compression ratio kills compressors.


Here is a nice hand book on Calcium Chloride. which shows temp range by strength of brine.


http://www.dow.com/PublishedLiteratu...romPage=GetDoc