A parallel-flow double-pipe heat exchanger operates with hot water flowing inside the inner pipe and oil flowing in the annular space between the two pipes. The water-flow rate is 2.0 kg/s and it enters at a temperature of 90 °C. The oil enters at a temperature o 10°C and leaves at a temperature of 50 °C while the water leaves the exchanger at a temperature of 60 °C. Calculate the value of the overall heat-transfer coefficient expressed inW/m² °C by (i) LMTD method and (ii) NTU method, if the area for the heat exchanger is 20 m².

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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A parallel-flow double-pipe heat exchanger operates with hot water flowing inside the
inner pipe and oil flowing in the annular space between the two pipes. The water-flow
rate is 2.0 kg/s and it enters at a temperature of 90 °C. The oil enters at a temperature of
10 °C and leaves at a temperature of 50 °C while the water leaves the exchanger at a
temperature of 60 °C. Calculate the value of the overall heat-transfer coefficient
expressed inW/m² °C by (i) LMTD method and (ii) NTU method, if the area for the
heat exchanger is 20 m'.
Transcribed Image Text:A parallel-flow double-pipe heat exchanger operates with hot water flowing inside the inner pipe and oil flowing in the annular space between the two pipes. The water-flow rate is 2.0 kg/s and it enters at a temperature of 90 °C. The oil enters at a temperature of 10 °C and leaves at a temperature of 50 °C while the water leaves the exchanger at a temperature of 60 °C. Calculate the value of the overall heat-transfer coefficient expressed inW/m² °C by (i) LMTD method and (ii) NTU method, if the area for the heat exchanger is 20 m'.
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