The radiator in an automobile is a cross-flow heat exchanger (UAs = 10 kW/K) that uses air (cp = 1.00 kJ/kg•K) to cool the engine coolant fluid (cp = 4.00 kJ/kg•K). The engine fan draws 30oC air through this radiator at a rate of 12 kg/s while the coolant pump circulates the engine coolant at a rate of 5 kg/s. The coolant enters this radiator at 80oC. Under these conditions, what is the number of transfer units (NTU) of this radiator?
(a) 2.0
(b) 2.5
(c) 3.0
(d) 3.5
(e) 4.0
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