In this class, the following expressions are used with the meanings indicated:
"heat exchange" means the heating or cooling of a fluid or fluent solid by direct or indirect contact with a heated or cooled fluid or fluent solid; alpha
"heat transfer" means the heating or cooling of a fluid or fluent solid by direct contact with a heated or cooled surface or body.
CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OF BOILERS (cleaning pipes or tubes in general Fulltext... Hierarchy... Expanded...B08B 9/02; devices or arrangements for removing water, minerals, or sludge from boilers while the boiler is in operation, or which remain in position while the boiler is in operation, or are specifically adapted to boilers without any other utility Fulltext... Hierarchy... Expanded...F22B 37/48; removal or treatment of combustion products or combustion residues Fulltext... Hierarchy... Expanded...F23J; removing ice from heat-exchange apparatus Fulltext... Hierarchy... Expanded...F28F 17/00)