ОСОБЕННОСТИ РАСЧЁТА ТЕПЛООБМЕННИКОВ С КИПЕНИЕМ ИЛИ КОНДЕНСАЦИЕЙ ОДНОЙ ИЗ СРЕД

Abstract

The heat exchangers for heating (or cooling) for one flows of gases or liquids at the expense of a heat of phase transformations in other flows find bright application in the modern systems of industrial gases production, chemical-technological and powerplants. A obligatory accessory of refrigerating steam compressor machine and also cryogenic air separation units are different by structures the capacitors and evaporators. The calculations of such apparatuses are complicated by that the local coefficients of a heat emission at boiling or condensation nonlinear depend on temperature pressures between a wall and environment undergoing phase transfer. In this connection the calculations of capacitors or evaporators will make with usage of labour-consuming graph-analytic methods or method of sequential approximations. The enough strict and reasoned method of calculations of two-line apparatuses for heating (cooling) of the single-phase environments condensed (boiling) streams is stated in the given article. The given method as model of heat exchange at phase transfers uses dependences of coefficient of a heat emission on density of heat flux. The example of calculation of a heat-exchange surface of production overcooler of nitrogen for air separation unit КжАр-2 is reduced.