Abstract: The invention relates to an improved method for removing corrosive heavy metal ions from aqueous fluids used in heat exchange systems. The method provides for the employment of a getter upstream of a heat exchange and in proximate contact therewith so that the getter removes said ions from said fluid before the fluid is introduced into the heat exchanger.

Abstract: The invention relates to an improved aqueous solar energy collector system which includes a heat exchange panel wherein a getter having a surface layer in contact with the aqueous fluid which is characterized by a high affinity for corrosive metal ions in the aqueous fluid is provided upstream of the heat exchangers to thereby remove said corrosive ions from the aqueous fluid before it is introduced into the heat exchanger.

Abstract: A solar energy collector system including at least one heat exchange panel posessing a system of internal tubular passageways defining opposed headers connected by connecting portions of said passageways extending therebetween, said passageways including entry and exit portions extending from opposing ends of said headers to provide ingress and egress openings for a heat exchange medium. The panels include at least one internal, second passageway adjacent and in juxtaposition to said internal tubular passageways but spaced therefrom and independent therefrom.

Abstract: Improvements in the direct chill casting of copper base alloys such as the tin brasses, tin bronzes and those alloys which exhibit a liquidus-solidus temperature separation of at least 50.degree. C. is brought about by utilizing boron nitride particles in the dressing material for the mold walls. These boron nitride particles may also be added to normally used molten metal covering material and utilized as a cover for said alloys in the casting process. The most effective results in casting are obtained when using the boron nitride particles in mold dressing form in conjunction with molten cover form.

Abstract: Glass or ceramic-to-metal composites or seals wherein the glass or ceramic is bonded to an iron base alloy consisting essentially of from 1-5% silicon and from 1-10% chromium, remainder iron. The alloy develops a thermal oxide film which consists essentially of chromium oxide and .alpha.Fe.sub.2 O.sub.3 which may comprise from 10 to 100% of the oxide film thickness on the metal. The invention also includes a process of bonding the glass or ceramic to the metal which eliminates the need of a prolonged heat treatment performed in a special atmosphere.