An air-cooled condenser is used to condense isobutane in a binary geothermal power plant. The isobutane is condensed at 85ºC by air (cp = 1.0 kJ/kg•ºC) that enters at 22ºC at a rate of 18 kg/s. The overall heat transfer coefficient and the surface area for this heat exchanger are 2.4 kW/m2•ºC and 2.6 m2, respectively. The outlet temperature of the air is
(a) 35.6ºC
(b) 40.5ºC
(c) 52.1ºC
(d) 58.5ºC
(e) 62.8ºC
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