Heat Transfer Questions


Q.  Consider an element with finite dimensions. In general which among the following equations is correct for change in energy of element during a time span dt?

a. [Heat generated in the element during time dt] + [Heat flow into the element during time dt] + [Heat flow out of the element during time dt]
b. [Heat generated in the element during time dt] + [Heat flow into the element during time dt] – [Heat flow out of the element during time dt]
c. [Heat generated in the element during time dt] – [Heat flow into the element during time dt] – [Heat flow out of the element during time dt]
d. none of the above


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No explanation is available for this question!
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