A heat exchanger is used to condense steam coming off the turbine of a steam power plant by cold water from a nearby lake. The cold water (cp = 4.18 kJ/kg•ºC) enters the condenser at 16ºC at a rate of 42 kg/s and leaves at 25ºC while the steam condenses at 45ºC. The condenser is not insulated and it is estimated that heat at a rate of 8 kW is lost from the condenser to the surrounding air. The rate at which the steam condenses is
(a) 0.228 kg/s
(b) 0.318 kg/s
(c) 0.426 kg/s
(d) 0.525 kg/s
(e) 0.663 kg/s
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