Equations for change in energy of element - Heat Transfer

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?
- Published on 12 Aug 15

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

ANSWER: [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]

Related Content

➨ Post your comment / Share knowledge


Enter the code shown above:

(Note: If you cannot read the numbers in the above image, reload the page to generate a new one.)
▲