METHOD AND SYSTEM FOR PRODUCING DIFFERENT PHASES OF COOLANT STATE Russian patent published in 2002 - IPC

FIELD: heat- transfer engineering. SUBSTANCE: method includes production of different phases of coolant state by disposing coolant in zones where temperature is other than that of coolant, its twisting within spiral, conversion from one state to others as it flows over spiral followed by its outlet in one of these states to user; coolant flow speed over spiral as well as pressure across each of its sections are maintained constant due to varying flow section area of spiral as coolant moves lengthwise of spiral. Flow section area of spiral increases from its entrance towards exit provided coolant temperature is lower than temperature of medium about spiral. Spiral flow section area decreases from its entrance towards exit provided coolant temperature is higher than temperature of medium about spiral. System for producing different phases of coolant state has housing accommodating spiral with coolant flowing over it, coolant temperature being other than temperature of medium about spiral; inlet and outlet pipelines. Spiral is made in the form of two coaxial shells placed one into other with certain clearance between them receiving varying-width flat ribbon with one of its edges contacting the outer shell and other edge secured on inner shell; when coolant temperature is below temperature of medium about spiral, ribbon is wound on this shill over spiral at varying pitch increasing from spiral entrance to its exit; when coolant temperature is higher than temperature of medium about spiral, it is wound at varying pitch decreasing from spiral entrance to its exit. Attached to each end of shells is strip with central and peripheral holes; central holes communicate with internal space of inner shell , peripheral hole of first strip provides communication between inlet pipeline and space formed by first pitch of ribbon turn and by abutting surfaces of shells; peripheral hole of second strip is used for communication between outlet pipeline and space formed by last turn of ribbon and abutting surfaces of shells; housing directly communicates with outer shell. Both shells are cylindrical in shape and are spaced apart through distance equal to width of flat ribbon. In addition shells may be conical in shape and spaced apart through distance equal to width of flat ribbon. EFFECT: enhanced heat-transfer surface, improved uniformity of hot gas flow distribution over transverse flow in tube space. 6 cl, 2 dwg