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= A hot water pipe (Di = 4 cm, Do = 6 cm, L = 2 m) made of "Plain Carbon Steel" is being moved into a running cold water to heat up the cold water and cool down the hot water. Hot water flows inside the pipe at a temperature of Thw = 90 C, with a convection coefficient h₁ = hhw = The cold water is outside the pipe at a bulk temperature Tcw = 20 C, and a flow = 0.01 m/sec. 200 W/m² K rate Ucw,00 a) Please construct a thermal circuit for this heat transfer system. Please label all the resistors and the temperatures before and after each resistor. (hint: Where does the heat come from and go? How many thermal resistors, and what are they? Are they in series or parallel? What geometry / coordinate?) b) If the pipe is placed such that the cold water flows across the pipe (Figure 1). What is the outer convection coefficient, hout? What is the total heat transfer rate for the pipe? What are the surface temperatures at the outer and inner surfaces of the pipe? Tew Too,out 20 C Ucw uo,out = 0.01 m/s cold water Do Di (Fig. 1) hot water hhw = 200 W m²K Thw = 90 C L

= A hot water pipe (Di = 4 cm, Do = 6 cm, L = 2 m) made of "Plain Carbon Steel" is being moved into a running cold water to heat up the cold water and cool down the hot water. Hot water flows inside the pipe at a temperature of Thw = 90 C, with a convection coefficient h₁ = hhw = The cold water is outside the pipe at a bulk temperature Tcw = 20 C, and a flow = 0.01 m/sec. 200 W/m² K rate Ucw,00 a) Please construct a thermal circuit for this heat transfer system. Please label all the resistors and the temperatures before and after each resistor. (hint: Where does the heat come from and go? How many thermal resistors, and what are they? Are they in series or parallel? What geometry / coordinate?) b) If the pipe is placed such that the cold water flows across the pipe (Figure 1). What is the outer convection coefficient, hout? What is the total heat transfer rate for the pipe? What are the surface temperatures at the outer and inner surfaces of the pipe? Tew Too,out 20 C Ucw uo,out = 0.01 m/s cold water Do Di (Fig. 1) hot water hhw = 200 W m²K Thw = 90 C L

Introduction to Chemical Engineering Thermodynamics
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
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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= A hot water pipe (Di = 4 cm, Do = 6 cm, L = 2 m) made of "Plain Carbon Steel" is being moved into a running cold water to heat up the cold water and cool down the hot water. Hot water flows inside the pipe at a temperature of Thw = 90 C, with a convection coefficient h₁ = hhw = The cold water is outside the pipe at a bulk temperature Tcw = 20 C, and a flow = 0.01 m/sec. 200 W/m² K rate Ucw,00 a) Please construct a thermal circuit for this heat transfer system. Please label all the resistors and the temperatures before and after each resistor. (hint: Where does the heat come from and go? How many thermal resistors, and what are they? Are they in series or parallel? What geometry / coordinate?) b) If the pipe is placed such that the cold water flows across the pipe (Figure 1). What is the outer convection coefficient, hout? What is the total heat transfer rate for the pipe? What are the surface temperatures at the outer and inner surfaces of the pipe? Tew Too,out 20 C Ucw uo,out = 0.01 m/s cold water Do Di (Fig. 1) hot water hhw = 200 W m²K Thw = 90 C L
Transcribed Image Text:= A hot water pipe (Di = 4 cm, Do = 6 cm, L = 2 m) made of "Plain Carbon Steel" is being moved into a running cold water to heat up the cold water and cool down the hot water. Hot water flows inside the pipe at a temperature of Thw = 90 C, with a convection coefficient h₁ = hhw = The cold water is outside the pipe at a bulk temperature Tcw = 20 C, and a flow = 0.01 m/sec. 200 W/m² K rate Ucw,00 a) Please construct a thermal circuit for this heat transfer system. Please label all the resistors and the temperatures before and after each resistor. (hint: Where does the heat come from and go? How many thermal resistors, and what are they? Are they in series or parallel? What geometry / coordinate?) b) If the pipe is placed such that the cold water flows across the pipe (Figure 1). What is the outer convection coefficient, hout? What is the total heat transfer rate for the pipe? What are the surface temperatures at the outer and inner surfaces of the pipe? Tew Too,out 20 C Ucw uo,out = 0.01 m/s cold water Do Di (Fig. 1) hot water hhw = 200 W m²K Thw = 90 C L
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