Saturated steam flows at 1 g/s at 10 atm (about 180 ?C) into a heat exchanger

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Saturated steam flows at 1 g/s at 10 atm (about 180 ?C) into a heat exchanger. Inside the heat exchanger, steam condenses and the liquid water is released through a pressure-reducing device as saturated liquid water at 1 atm pressure (100 ?C). Estimate the enthalpy change of this stream as it passes through the heat exchanger (in J/s). Explain your calculation by showing an enthalpy path carefully - including pressure, temperature, and phase change steps. In this problem you may assume that pressure-change-only steps produce negligibly small enthalpy changes. Data: Steam heat capacity: 2.1 J/(g ?C); Liquid water heat capacity: 4.2 J/(g ?C); Enthalpy of vaporization of water at 1 atm: 2260 J/g