A 150m^3 bioreactor is operated at 35 C to produce fungal biomass from glucose. The rate of oxygen uptake by the culture is 1.5 kg m^-3 h^-1 the agitator dissipates energy at a rate of 1 kW m^-3 Cooling water available from a nearby river at 10 C is passed through an internal coil in the fermentation tank at a rate of 60 m^3 h^-1 If the system operates at steady state, what is the exit temperature of the cooling water?