• # question_answer After expansion from a gas turbine, the hot exhaust gases are used to heat the compressed air from a compressor with the help of a cross flow compact heat exchanger of 0.8 effectiveness. What is the number of transfer units of the heat exchanger? A) 2                                 B) 4C) 8                                 D) 16

Effectiveness, $\varepsilon =\frac{NTU}{1+NTU}$ 0.8 $=\frac{NTU}{1+NTU}$ NTU = 4