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利用积分法导出卡电加热钢丝中钢丝散热量计算式。经验证，说明在电加热的设计中，可以利用本导出公式直接计算钢丝的散热量，并分析对热效率的影响因素
Using the integral method to derive the calorific value calculation formula of the steel wire in the card electric heating wire. Prove that the design of electric heating, the export formula can be used to directly calculate the heat dissipation of steel wire, and analyze the impact of thermal efficiency factors