To improve energy efficiency, we wish to utilise a pipe with flowing hot water at an enthalpy of 750.9 kJ/kg that will be sent through a shell-and-tube heat exchanger and rejected with an enthalpy of 243.9 kJ/kg. We can assume a steady-state mass flow of 1.9 kg/s. How much energy can be extracted? Enter your answer with units of kW (for example: "35.2 kW").