Abstract: An absorption refrigeration system which has a method for separation an absorption enhancing additive from a composite refrigeration fluid. The system has a separator interposed in sites between an absorber and a generator to distill an additive from a composite refrigeration fluid. After the separator a composite refrigerant passes through a generator, a condenser and an evaporator before being passed to an absorber. The additive distillate is passed directly to the absorber from the separator bypassing the more volatile components of the system. The additive contacts the refrigerant fluid in the absorber thereby improving the absorption rate.

Abstract: A heat transfer surface for boiling liquid refrigerant 11 and its equivalents and method for producing the surface. The surface comprises a porous, open-cell coating at least 15 mils thick, of oxidized metallic particles which are flame-sprayed onto a metal substrate. This surface includes a substantial number of nucleate boiling cavities having an equivalent radius in the range of 1.5 to 4 mils, which are the result of one or more of the following conditions in the flame-spraying process: (1) The flame-spraying nozzle is oriented so that the metallic particles impact the metal substrate at an angle in the range of 30.degree. to 75.degree.; (2) The metal substrate is preheated to a temperature which is at least 600.degree. F., but below the melting point of the substrate; and (3) The flame-spraying apparatus is positioned such that the metallic particles travel from 3 to 6 inches before impacting the substrate.