One Method of Calculation for Thermal Capacity of Steam Evaporator

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  • 蒸気発生部の蓄熱容量の一計算法
  • ジョウキ ハッセイブ ノ チクネツヨウリョウ ノ イッケイザンホウ

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Abstract

The thermal capacity of steam evaporator is the most important parameter for dynamics of control system. It is given by the form of time constant TB and expressed by a nomograph. [numerical formula] Where wm (weight of steel parts), w' (weight of water part), w" (weight of steam part), cm (specific heat of steel), p1 (steam pressure), θ1 (steam temperature), i' (enthalpy of saturated water), i" (enthalpy of saturated steam), v' (specific volume of saturated water), v" (specific volume of saturated steam), b (total inner volume), A (thermal equivalent of work), q (heat transmitted per unit time), suffix 0 (values at standard state). The effects of changes of feed water temperature, feed water flow and load steam flow are also given by nomographs.

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