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Technical Information DuPont Suva refrigerants ART-6 Guidelines for Converting Nonaqueous Refrigeration Brine Systems to Use Applications In many industrial refrigeration applications the refrigeration equipment is located in a service facility separate from the industrial process. The process heat is transferred to the refrigeration equipment by means of a circulating heat transfer fluid known as a brine or secondary refrigerant.

This fluid will serve as the refrigerant in a conversion of a service facility to a large scale, commercial facility. However, if a major increase in the refrigerant temperatures is expected or anticipated as a result of a major shift in the refrigeration process, an alternative method must be chosen. A conversion from a service facility to a large scale industrial facility can be accomplished by using a brine-based system. Conventional brine systems require large water volumes to maintain high refrigerant temperatures. As the water evaporates it leaves behind a large residue of salt, often in the form of suspended particles. A very cold brine solution, called a “dry brine” can be used for refrigerant recovery. The following paragraphs describe conventional brine systems as well as several alternatives, more cost-effective methods for brining and recovering refrigerant from a service plant. The application for the traditional brine system is the recovery of refrigerant from a large commercial service plant before it has been exposed to the environment. The system will typically use brines with very high salt concentrations (i.e. more than 30 pounds per thousand gallons) in large volumes. The system is a series of tanks that can be refilled with fresh, non-refrigerated brine solution. In most brine systems there is a reservoir that holds the brine and cools the brine solution by conduction while the liquid-refrigerant mixture is maintained at a temperature of between 32 °F and 40 °F. The brine will be used as the cooling medium in process and/or finished refrigerated equipment for a period of a few weeks or months. The most expensive system currently available for recovery of refrigerant from a commercial facility is the Art-6 conversion process. The Art-6 process uses a conventional brine system in accordance with the standards established in the Code of Federal Regulations, Title 42, Chapter I, Section 3 (refrigerant regulation section 2). This method is a long term recovery method that is highly efficient and economical. A typical brine system consists of a series of large tanks connected to a reservoir. All the tanks and reservoirs should be located in a remote location and must be protected from environmental extremes. Most commercial production companies have large refrigerated service facilities in both the service and finishing facilities. Typically, the service portion will be located outside the operating facility while the finishing will be located in the service area.

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