Steam enters a counter-flow heat exchanger, dry saturated at 10 bar and leaves at 350°C. The mass flow of steam is 800 kg/min. The gas enters the heat exchanger at 650°C and mass flow rate is 1350 kg/min. If the tubes are 30 mm diameter and 3 m long, determine the number of tubes required. Neglect the resistance offered by metallic tubes. Use the following data: Solution: For steam: tsat = 180°C Cps = 2.71 k]/kg°C h,= 600 W /m²°C For gas: Cpg = 1 k]/kg°C hg= 250 W/m²°C

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