Chapter 11, Problem 11.20P

Consider a concentric tube heat exchanger with an area of ${\text{50m}}^2$ operating under the following conditions:

(a) Determine the outlet temperature of the hot fluid.
(b) Is the heat exchanger operating in counterflow or parallel flow, or can’t you tell from the available information?
(c) Calculate the overall heat transfer coefficient.
(d) Calculate the effectiveness of this exchanger.
(e) What would be the effectiveness of this exchanger if its length were made very large?***