Consider a double-pipe heat exchanger with a tube diameter of 10 cm and negligible tube thickness. The total thermal resistance of the heat exchanger was calculated to be 0.025 ºC/W when it was first constructed. After some prolonged use, fouling occurs at both the inner and outer surfaces with the fouling factors 0.00045 m2•ºC/W and 0.00015 m2•ºC/W, respectively. The percentage decrease in the rate of heat transfer in this heat exchanger due to fouling is
(a) 2.3%
(b) 6.8%
(c) 7.1%
(d) 7.6%
(e) 8.5%
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.