A Calculation Method of the Inside Temperature of Ljungstrom-Type Air-Preheaters

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  • ユングストローム形空気予熱器の内部温度計算法
  • ユングストロームケイ クウキ ヨネツキ ノ ナイブ オンド ケイサンホウ

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Theoretically, the inside temperature of Ljungstrom-Type Air-Preheaters can be expressed in the form of a partial differential equation with location and time variables. So far the general solution and any powerful calculation method have not been found. The author utilized the difference equation technique for the location variables and eliminated the location terms by setting their increments to specific values. This partial differential equation was transformed into an asymptotic ordinary differential equation of the first degree with many variables, and its general solution was obtained. From the general solution, a convenient nomogram was made, which should enable us to calculate with ease the temperature distributions of gas, air, and of the conducting surfaces. This approximation method gave a good precision in calculation; errors fall within 1% in case of temperature efficiency calculation and the maximum error was about 2.5% in the inside temperature calculation.

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