DEVELOPED SURFACES AS A FACTOR FOR OPTIMIZING THE DESIGN OF HEAT EXCHANGERS

Abstract

Optimization of the geometric parameters of heat exchangers can be carried out according to many parameters. One of the most important are geometric dimensions. The development of an optimized heat exchanger design using experimental planning methods is an urgent task. This allows you to minimize the cost of materials for the manufacture of devices and transfer heat most efficiently.
 Intensification of heat exchange is always given great attention for any branch of industry and technology. High requirements are put forward to the structures of heat exchange equipment, which are related to the reduction of their mass, occupied volume, etc. A promising direction is the use of heat exchange surfaces with a large area, that is, developed, which is achieved by finning the primary surface. The optimal design of the surface development is determined by the values of the heat transfer coefficients from the hot coolant to the dividing wall of the heat exchanger tube and from the wall to the cold coolant. The most widely used are ribbed surfaces with knurled ribs, which are quite convenient in production and further operation
 The purpose of the work is to determine the influence of such factors as the length of one finned tube, the bearing diameter of the finned tube and the finning ratio on the optimal structural performance of the compressed air heater based on the minimum length of the pipe system.
 In terms of influence, the length of one tube is the most important, and the fin ratio is of secondary importance. With a significant increase in the finning ratio of the pipes, the total length of the pipes decreases.
 The developed technique makes it possible to determine the optimal value of such a parameter as the total length of finned tubes. Also, on the basis of the obtained results, it is possible to develop an appropriate design of the heat exchanger with the accepted number of tubes transverse to the flow of the heat carrier that is heated. With the help of the developed methodology, it is possible to analyze the value of the length of the tubular system of the heat exchanger with various combinations of the above factors and to optimize its design in a fairly simple formulation.