THE RECALCULATING TECHNIQUE THE HEAT-HYDRAULIC CHARACTERISTICS OF DIRECT-FLOW CYLINDRICAL STEAM GENERATORS OPERATING ON A FREON COOLANT, WITH THE BOUNDARY CONDITIONS OF THE SECOND KIND FOR THE BOUNDARY CONDITIONS OF THE FIRST KIND

The article is devoted to the development of a method for recalculating the thermal-hydraulic characteristics of direct-flow cylindrical steam-generating channels operating on a Freon coolant from the boundary conditions of the second kind for the boundary conditions of the first kind. The need for the development of such recalculation procedure is due to the presence in the literature of calculated dependences describing the heat transfer during evaporation of the coolant in porous channel for boundary conditions of the second kind, while the practical plan problems are often conditioned by other boundary conditions, in particular boundary conditions of the first kind. To clarify the essence of the recalculating method, the article briefly summarizes the calculated dependencies for computation of heat transfer and pressure drop in steam generating smooth-walled channels operating on a Freon heat carrier. The proposed method of recalculation is based on the use of the method of successive approximations when calculating the total amount of heat that is necessary for the phase transition process of evaporation. The final goal of the recalculation technique was to create a program for calculating the heat-hydraulic efficiency of direct-flow cylindrical steam generators operating on a Freon coolant. The proposed recalculation technique makes it possible to calculate in such steam generators for boundary conditions of the first kind next thermal-hydraulic characteristics: the channel length necessary for complete evaporation of the heat carrier; power required for pumping the coolant and the total amount of heat transferred to the coolant during the evaporation process.