本文在一些通常采用的假定下,推导出单流多层套管式释热元件传热計算的理論公式;并在此基础上,指出了解决迴流多层套管式释热元件传热問題的逐次逼近法。文中附有計算实例。 Based on some commonly used assumptions, this paper deduces the theoretical formula for the heat transfer calculation of single-stream multi-layer bushing type heat release element. Based on this, it is pointed out that the heat transfer problem of multi-layer bushing type heat release element Successive approximation method. Text attached to the calculation example.