Dependence of changes in the nominal heat flow of tubular heating devices on their design features

Abstract

The article is devoted to determining the nominal heat flow of a steel tubular heating device depending on the location of the pipes (vertical or horizontal), the number and diameter of pipes, as well as the value of the heat transfer coefficient. The main advantages and disadvantages of steel tubular heating devices are given. It has been determined that the mode of heat flow along the pipes in a tubular heating device changes from laminar to turbulent. As a result of the research, it was found that with a vertical arrangement of pipes in a heating device, when the coolant temperature in the pipes is 90-95°C, the height of the transition zone from laminar flow to turbulent flow varies in the range from 0.75 m to 1.25 m. If the tubular heating device is structurally made with horizontally located pipes, then the transition from the laminar flow regime to the turbulent regime is not observed. A dependence has been derived that allows one to determine the nominal heat flow of a steel tubular radiator depending on the height, number of sections, as well as the design features of the tubular heating device. A comparative analysis of changes in the nominal heat flow of a tubular heating device was carried out depending on the height, number of sections, design features, as well as the orientation of the pipes in the section. The nominal heat flux of a tubular radiator varies depending on the orientation of the pipes. It is shown that with a vertical arrangement of a tubular radiator, the value of the nominal heat flux exceeds the same value with a horizontal arrangement.