The stainless steel tube/aluminum fin evaporator construction replaces hot dip galvanized (zinc-coated) carbon steel coils in ammonia refrigeration systems. According to the company, stainless steel is highly corrosion resistant, which minimizes the potential for ammonia leaks in hostile environments and is easily repaired in the field by the welding process. The manufacturer says that the properties of aluminum make it an ideal metal to use as fin material in ammonia heat exchangers because aluminum has a low cost, is lightweight, is highly conductive, and is corrosion resistant. Aluminum is more efficient at heat transfer than galvanized steel and, in terms of speed and effectiveness, stainless tube/aluminum fin evaporators perform better than galvanized steel during defrost, the company claims.
Colmac Coil Mfg. Inc., P.O. Box 571, Colville, WA 99114-0571; 800-845-6778 or 509-684-2595; 509-684-8331 (fax); firstname.lastname@example.org; www.colmaccoil.com.