An air conditioner condenser in an automobile consists of 2 m 2 of tubular heat exchange area

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An air conditioner condenser in an automobile consists of 2 m2 of tubular heat exchange area whose surface temperature is 30°C. Saturated refrigerant-134a vapor at 50°C (hfg = 152 kJ/kg) condenses on these tubes. What heat transfer coefficent must exist between the tube surface and condensing vapor to produce 1.5 kg/min of condensate?
(a) 95 W/m· K

(b) 640 W/m· K

(c) 727 W/m· K

(d) 799 W/m· K

(e) 960 W/m· K

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