York Screw Chiller How low will it go?????

[US Iceman]

Nothing like a challenge thrown down to get a persons attention...

a salt brine solution

• Calcium or sodium chloride???
  • Has anyone checked the material compatibility charts?

  • The system will drain and flush the brine after each daily usage to alleviate damage to the copper chiller tubes.

I would be concerned about repeated exposure to air, can't say why but this bothers me.

other minor changes such as a slide valve modify??

• did this change the Vi?

with a flow rate of 450 gpm

in at -39 F (-39.4C) and out at -43 F (-41.6C) PD not a problem..

• Earlier you mentioned -40F (-40C), which is it?
• Is the tube velocity high enough to prevent laminar flow??
• Also, is the brine a liquid mix or flakes?

For some rough numbers:
A 163 short (open flash economizer) with R-22 will do about 30 Tons at -50F (-45.5C) suction and 100F (37.7C)condensing (no pressure losses allowed so this is already too low for capacity). Power = 111.3 BHP (~83 kW)

Without checking further...this looks like it could be trouble...