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4 August, 03:40

Factors that may allow one to model a control volume as having negligible (zero) heat transfer include (1) the outer surface of the control volume is well insulated, (2) the outer surface area of the control volume is too small to permit effective heat transfer, (3) the temperature difference between the control volume and its surroundings is so small that the heat transfer can be ignored, and (4) the working fluid passes through the control volume so quickly that there is not enough time for significant heat transfer to occur.

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  1. 4 August, 07:34
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    All are true

    Explanation:

    To model control volume, one must consider the temperature difference between control volume and surroundings so that in case the temperature difference is small, heat transfer can be ignored. Besides, you must ensure that the outer surface area of control volume is well insulated and too small to permit effective heat transfer. Moreover, you must ensure that the working fluid passes through the control volume so quickly that there is not enough time for significant heat transfer to occur.
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