Abstract: A dephlegmator is provided comprising two stages connected in series wherein a first stage includes an air-cooled reflux condenser and a second stage includes a generally horizontal tube bundle of smooth or finned tubes that can be operated selectively in either an air-cooled (dry) mode under selected ambient conditions or in a wet evaporatively cooled mode under other selected ambient conditions including that of elevated ambient temperature. Spray nozzles may be installed above the tube bundle whereby water can be sprayed onto the tube bundle. One or more collection troughs are preferably provided beneath the tube bundle for collecting run-off water and enabling recycling of excess deluge water. Preferably, the tube bundle comprises at least two, and preferably three groups of tubes communicating with each other wherein the second group of tubes has appreciably fewer tubes in it than the first group of tubes and any third group of tubes has appreciably fewer tubes in it than the second group of tubes.

Abstract: A dephlegmator is provided comprising two stages connected in series wherein a first stage includes an air-cooled reflux condenser and a second stage includes a generally horizontal tube bundle of smooth or finned tubes that can be operated selectively in either an air-cooled (dry) mode under selected ambient conditions or in a wet evaporatively cooled mode under other selected ambient conditions including that of elevated ambient temperature. Spray nozzles may be installed above the tube bundle whereby water can be sprayed onto the tube bundle. One or more collection troughs are preferably provided beneath the tube bundle for collecting run-off water and enabling recycling of excess deluge water. Preferably, the tube bundle comprises at least two, and preferably three groups of tubes communicating with each other wherein the second group of tubes has appreciably fewer tubes in it than the first group of tubes and any third group of tubes has appreciably fewer tubes in it than the second group of tubes.

Abstract: The finned tube heat exchanger (1) has a plurality of elongated heat exchanger tubes (2) arranged parallel to one another and with a cross section, the length (L) of which is a multiple greater than its width (B). The heat exchanger tubes (2) are interconnected by fins (3) extending parallel to the direction of flow (SR) of the cooling air. Parallel adjacent air conduction grooves (7) running in the direction of flow (SR) of the cooling air, open at the fin ends (6) and in zig-zag array are made on at least one side surface of the fins (3). Said grooves are semicircular in cross section and consist of straight groove sections (8) and arc-shaped transition sections (9) steplessly interconnecting said straight sections. The groove sections may also be a component of zig-zag fin sections. Thus the groove sections still run obliquely to the longitudinal run of the fins.