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28 R INK MAGAZ INE MAy/June 2007 RINK PHOTO We have heard of quite a few chiller barrel replacements this year so we thought it was a good time to remind rink operators of the importance of regular and annual tests for your secondary refrigeration system (The brine-glycol system). Maintenance of Brine Calcium chloride brine as is used in curling and skating rinks is a solution of calcium chloride in water. Depending on its concentration, the point at which it freezes will vary over a wide range. The refrigerant temperature in the chiller is normally lower than the temperature of the brine circulating through the system. Thus, care must be taken at all times to ensure that the brine freezing point is maintained at a low enough point to prevent any problems or freeze up of the chiller. Generally, thermodynamic characteristics of calcium chloride solutions and water such as freeze point and boiling point vary among commercially manufactured calcium chloride solutions and deviate, somewhat, from those of pure calcium chloride because of impurities in the product. A reputable manufacturer will sell a product that has few impurities, and the freeze point values of their calcium chloride solution will approach those of pure calcium chaloride solutions. As calcium chloride is added to water, the freeze point is generally supressed. That is, increasing the percentage of calcium chloride within The Secondary Refrigeration System B R I N E M A I N T E N A N C E excerpted from O.R.F.A. REFRIGERATION MANUAL: ICE RINK APPLICATIONS B R I N E M A I N T E N A N C E