4 18 Using a lumped capacitance approach and

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例题 4 - 求解 (续) 18. 手 计算检验结果: Using a lumped capacitance approach and

例题 4 - 求解 (续) 18. 手 计算检验结果: Using a lumped capacitance approach and assuming that loads are constant over the time interval, the transient mean temperature response of a system subjected to heat flux (q*) over area AH, convection (h, T ) over area AC, and heat generation can be estimated with the following relationship (Ref. 1): The lumped capacitance method should yield reasonable results since the Biot Number is far less than 0. 1 for this system. Based on mass averaged properties, the mean temperature of this model as a function of time for the first 300 seconds of the transient (low power operation) can be approximated by: Estimate the mean temperature of the system at the end of the second load step (t=300 seconds). Recall from 例题 2 that the high power steady state temperature was estimated using a similar approach to be 97. 17 C. Reference: Incropera, F. P. and De. Witt, D. P. ; Fundamentals of Heat and Mass Transfer, Third Edition. John Wiley & Sons, 1990, pages 234 -236. 8

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