Question Solved1 Answer Question # 2 (20 points) A single-pass heat exchanger condenses steam at 1 atm (100 °C) on the shell side and heats water from 10°C to 30°C on the tube side with overall heat transfer coefficient U = 2500 W/m²K. The tubing is thin-walled, 5 cm in diameter, and 2 m in length. (a) your boss asks whether the exchanger should be counter flow or parallel flow. How do you advice him? And why? Evaluate: (b) the LMTD; (c) the mass flow rate of the water; (d) the number of heat transfer units (N or NTU); and (e) the effectiveness of the heat exchanger ε. (f) draw a schematic of the temperature length diagram for the heat exchanger. (Take Cpw = 4187 J/kg K).

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Transcribed Image Text: Question # 2 (20 points) A single-pass heat exchanger condenses steam at 1 atm (100 °C) on the shell side and heats water from 10°C to 30°C on the tube side with overall heat transfer coefficient U = 2500 W/m²K. The tubing is thin-walled, 5 cm in diameter, and 2 m in length. (a) your boss asks whether the exchanger should be counter flow or parallel flow. How do you advice him? And why? Evaluate: (b) the LMTD; (c) the mass flow rate of the water; (d) the number of heat transfer units (N or NTU); and (e) the effectiveness of the heat exchanger ε. (f) draw a schematic of the temperature length diagram for the heat exchanger. (Take Cpw = 4187 J/kg K).
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Transcribed Image Text: Question # 2 (20 points) A single-pass heat exchanger condenses steam at 1 atm (100 °C) on the shell side and heats water from 10°C to 30°C on the tube side with overall heat transfer coefficient U = 2500 W/m²K. The tubing is thin-walled, 5 cm in diameter, and 2 m in length. (a) your boss asks whether the exchanger should be counter flow or parallel flow. How do you advice him? And why? Evaluate: (b) the LMTD; (c) the mass flow rate of the water; (d) the number of heat transfer units (N or NTU); and (e) the effectiveness of the heat exchanger ε. (f) draw a schematic of the temperature length diagram for the heat exchanger. (Take Cpw = 4187 J/kg K).
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Given Single Phase kareat exchanger of condensing type.T_(h)=100^(@)Cwater heats from T_(c_(1))=10^(@)CT_(c_(2))=30^(@)C{:[{:[U=2500W//m^(2)K],[" Area of tube "=piDl]:}],[=pi(0.05)xx2],[=0.31415m^(2)],[" (b) "-:(Delta T)_("imto ")=(DeltaT_(1)-DeltaT_(2))/(ln((DeltaT_(1))/(DeltaT_(2))))],[T_(n_(1)=)^(100^(@)C)longrightarrowT_(h_(2))=100^(@)C],[T_(c_(2))=30^(@)C],[T_(1)=10^(@)C]:}{:[DeltaT_(1)=T_(n_(1))-T_(C_(1))==100-10=90^(@)C],[DeltaT_(2)=T_(h_(2))-T_(C_(2))=100-30=70^(@)C],[(DeltaT_("LMAD ")=:}(90-70)/(ln((90)/(70)))],[" Heat flow rate "=UA(LMTD)],[=UA(AT)_("LMID ")],[" He "=79.5815^(@)C],[Q=62501.3856W]:}(a) It is a ... See the full answer