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Problem 3 Crude oil, cp=1.92 kJ/(kg.K), flows at a rate of 0.33 kg/s through the inner pipe of a tube-in-tube heat exchanger and it is heated from 28 °C to 97 °C. Another hydrocarbon, cp=2.54 kJ/(kg.K), enters at 246 °C. The overall coefficient of heat transfer is found to be 4321 W/(m2.K). Determine for a minimum temperature difference of 20 °C between the hot and cold fluids: a) the LMTD for parallel flow and for counter-flow heat exchanger; b) the surface area for both heat exchanger configurations; c) mass flow rate of hot fluid for both heat exchanger configurations.

Problem 3 Crude oil, cp=1.92 kJ/(kg.K), flows at a rate of 0.33 kg/s through the inner pipe of a tube-in-tube heat exchanger and it is heated from 28 °C to 97 °C. Another hydrocarbon, cp=2.54 kJ/(kg.K), enters at 246 °C. The overall coefficient of heat transfer is found to be 4321 W/(m2.K). Determine for a minimum temperature difference of 20 °C between the hot and cold fluids: a) the LMTD for parallel flow and for counter-flow heat exchanger; b) the surface area for both heat exchanger configurations; c) mass flow rate of hot fluid for both heat exchanger configurations.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Problem 3 Crude oil, cp=1.92 kJ/(kg.K), flows at a rate of 0.33 kg/s through the inner pipe of a tube-in-tube heat exchanger and it is heated from 28 °C to 97 °C. Another hydrocarbon, cp=2.54 kJ/(kg.K), enters at 246 °C. The overall coefficient of heat transfer is found to be 4321 W/(m2.K). Determine for a minimum temperature difference of 20 °C between the hot and cold fluids: a) the LMTD for parallel flow and for counter-flow heat exchanger; b) the surface area for both heat exchanger configurations; c) mass flow rate of hot fluid for both heat exchanger configurations.
Transcribed Image Text:Problem 3 Crude oil, cp=1.92 kJ/(kg.K), flows at a rate of 0.33 kg/s through the inner pipe of a tube-in-tube heat exchanger and it is heated from 28 °C to 97 °C. Another hydrocarbon, cp=2.54 kJ/(kg.K), enters at 246 °C. The overall coefficient of heat transfer is found to be 4321 W/(m2.K). Determine for a minimum temperature difference of 20 °C between the hot and cold fluids: a) the LMTD for parallel flow and for counter-flow heat exchanger; b) the surface area for both heat exchanger configurations; c) mass flow rate of hot fluid for both heat exchanger configurations.
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