A stirred tank fermentation reactor has height 2 m, diameter 1.5 m and is filled with a fermentation broth that can be assumed to have the physical properties of water. The fermenter must be maintained at a temperature less than 42 °C to prevent damage to the cell culture. After allowing for sensible heat losses to the cold feed, the heat that must be removed from the fermenter is 80 kW. Cooling water is available at 20 °C and can be returned at any temperature up to 35°C. Recommend a design for cooling the contents of the fermenter.