Sealed tube comparisons of the compatibility of desiccants with refrigerants and lubricants. Final report, August 1993--January 1995

摘要

Continuing environmental concerns mandate replacement of CFC's with alternate refrigeration fluids. Until now, relatively little testing had been reported in the literature for compatibility of desiccants in these new working fluids. Using bench scale test methods generally accepted throughout the industry today, this work provides data necessary to assess the compatibility of virtually all of the currently used desiccant types - both bead and molded core, with thirteen refrigerant/lubricant combinations. The desiccants have been tested by exposure to refrigerant and lubricant in sealed, glass tubes in accordance with ASHRAE/ANSI Standard 97-1989. After aging, the liquid phase was evaluated for acid anion formation, change in color, and presence of halide ions, the gas phase was analyzed for refrigerant decomposition by gas chromatography, and the desiccants were evaluated for changes in crush strength and for retention of acids and halide ions. Metal catalysts, also present in the sealed tubes, were visually examined for corrosion, copper plating, and appearance changes.