Water at a rate of m=63 g/s at 38°C is available for use as a coolant in a double- pipe heat exchanger whose total surface area is 1.4 m2. The water is to be used to cool an oil (Cp=2.09 kJ/kg K) from an initial temperature of 121°C. Because of other circumstances, an exit water temperature greater than 99°C cannot be allowed. The exit temperature of the oil must not be below 60°C. The overall heat transfer coefficient is 284 W/m2K, and is assumed to be independent of flowrate of either stream in the range of interest. Estimate the maximum flowrate of oil that may be cooled for cocurrent and countercurrent exchangers, assuming the flowrate of water is fixed at 63 g/s.