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tion. Scroll compressors are used in home refrigerators and are sealed, requiring no regular maintenance. However, when they do fail, they have to be completely replaced. Knowing the manufacturer, size of your compressors and the electric motors that drive them is essential for rink operators. And lastly, what type of chiller (evaporator) does your system use? For facilities with direct systems, this does not apply as direct systems use the rink floor as the chiller (evaporator) to remove the heat and turn the liquid pri- mary refrigerant into a vapor/gas. The chiller is a very important part of the indirect refrigeration system because it is in the chiller that the heat from the sec- ondary refrigerant (brine/glycol) is trans- ferred to the primary refrigerant (Ammonia/Freon). This heat transfer has to take place without the two substances mixing with each other. The main type of chiller used in ice rinks is the flooded chiller. This type of chiller floods the tubes full of secondary refrigerant inside of a shell with the pri- mary refrigerant. The second most common type of chiller used in ice rinks is the dry chiller (also called direct expansion chiller). This type of chiller floods the tubes full of pri- mary refrigerant inside of a shell with the secondary refrigerant. The use of plate and frame chillers in ice rink applications is becoming more prevalent. These chillers are much small- er in size and are more efficient for trans- ferring the heat from the primary to the secondary refrigerant. Plates are used instead of tubes and a shell for larger sur- face area, creating more heat transfer for the size of the unit. Any and all rink operators should know which of these systems and pieces of equipment are used in their rink. If they don't, the Basic Refrigeration course offered by STAR would be able to bring anyone up to speed on these systems. ★ may/june 2010 R IN K M A G AZ I N E 53 STARrinks.com CDIMS Controlled Dehumidification Solutions 5931 Ford Court Brighton, MI 48116 Fax: 810-229-7908 • sales@cdims.com www.cdims.com Don't Rob Your Refrigeration System to Dehumidify Your Rink. ARID-Ice ™ is the most effective and efficient gas fired desiccant system using reactivation recovery options and dew point controls to maximize performance and minimize total energy consumption. ARID-Ice units are equipped to reduce humidity levels, eliminate indoor condensation and fog, prevent mold, reduce refrigeration costs and improve indoor air quality, these systems utilize natural gas, steam or electric reacti- vation. CDIMS is the premier supplier of desiccant dehumidifiers. We have provided equipment for over 300 skating surfaces throughout North America from 500 to 45,000 SCFM. For ARID-Ice sales and equipment specifications, call 810-229-7900. Arid-Ice ™ Arid-Ice ™ Controlled Dehumidification Solutions