# Circle the following statements as true or false. (a) T F The F factor represents exchanger…

Circle the following statements as true or false.

(a) T F The F factor represents exchanger effectiveness.

(b) T F The F factor is a ratio of the true mean temperature

difference in a counterflow exchanger to that in the actual exchanger.

(c) T F The F factor is a ratio of the counterflow NTU to

NTU of the actual exchanger under consideration.

(d) T F The higher F factor means generally higher NTU.

(e) T F In the asymptotic region of the F-factor curves in

Fig. 3.26, a slight change in the exchanger thermal effectiveness means a large

change in the F factor, and hence a large change in

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Circle the following statements as true or false.

(a) T F The F factor represents exchanger effectiveness.

(b) T F The F factor is a ratio of the true mean temperature

difference in a counterflow exchanger to that in the actual exchanger.

(c) T F The F factor is a ratio of the counterflow NTU to

NTU of the actual exchanger under consideration.

(d) T F The higher F factor means generally higher NTU.

(e) T F In the asymptotic region of the F-factor curves in

Fig. 3.26, a slight change in the exchanger thermal effectiveness means a large

change in the F factor, and hence a large change in q and instability in the

exchanger performance ð Þ q = UAF Tlm .

(f) T F The F factor increases with an increasing number of

shell passes at the same total NTU for overall counterflow.

(g) T F A decreasing LMTD for an exchanger means increasing

its heat exchanger effectiveness.

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