In a 2,000 litre jacketed vessel, the available heat transfer area in the external jacket is 5 m². Chilled water at 10C is available to maintain the reactor contents at 30C. Estimate the required water flowrate (G kg h^-1), if the exit water temperature is not to exceed 20C.

The heat transfer coefficient (U W m^-1 C^-1) is given by the expression

1U=1.26410-3+1.389G-0.8