If you are talking about condenser water for water chillers, the appropriate doc would ARI Standard 550/590. The temps are selected based upon economics with respect to the cooling tower's approach temperature and typical weather data.
Dear SAK9
The appropriate material for a lab exhaust duct depends upon the stuff being used in the fume hood. 304 SS is good for a variety of chemicals and 316L is better, but if there will be HCL or Nitric Acids you should look at the Fiberglass ducts. There are fire code requirements...