A thermocouple lead consists of a small sphere of constantan (a Cu-Ni alloy) having a diameter of 1 mm. Constantan has a density (ρ) of 8920 kg/m3 , a thermal conductivity (k) of 24 W/(m.K), and a heat capacity (Cp) of 410 J/(kg.K). The thermocouple lead is initially at 20 ºC. It is placed into a hot air stream at 200 ºC. The heat transfer coefficient, h between the thermocouple lead and the air is 300 W/(m2 .K). a) Determine which resistance controls the heat transfer process. b) Determine the time required for the thermocouple reading to reach 95% of its total temperature change.
A thermocouple lead consists of a small sphere of constantan (a Cu-Ni alloy) having a diameter of 1 mm. Constantan has a density (ρ) of 8920 kg/m3 , a thermal conductivity (k) of 24 W/(m.K), and a heat capacity (Cp) of 410 J/(kg.K). The thermocouple lead is initially at 20 ºC. It is placed into a hot air stream at 200 ºC. The heat transfer coefficient, h between the thermocouple lead and the air is 300 W/(m2 .K). a) Determine which resistance controls the heat transfer process. b) Determine the time required for the thermocouple reading to reach 95% of its total temperature change.
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
Related questions
Question
A thermocouple lead consists of a small sphere of constantan (a Cu-Ni alloy) having a diameter of 1 mm. Constantan has a density (ρ) of 8920 kg/m3 , a thermal conductivity (k) of 24 W/(m.K), and a heat capacity (Cp) of 410 J/(kg.K). The thermocouple lead is initially at 20 ºC. It is placed into a hot air stream at 200 ºC. The heat transfer coefficient, h between the thermocouple lead and the air is 300 W/(m2 .K).
a) Determine which resistance controls the heat transfer process.
b) Determine the time required for the thermocouple reading to reach 95% of its total temperature change.
***Do not copy from chegg. That one is not correct.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
Recommended textbooks for you
Introduction to Chemical Engineering Thermodynami…
Chemical Engineering
ISBN:
9781259696527
Author:
J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:
McGraw-Hill Education
Elementary Principles of Chemical Processes, Bind…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
Introduction to Chemical Engineering Thermodynami…
Chemical Engineering
ISBN:
9781259696527
Author:
J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:
McGraw-Hill Education
Elementary Principles of Chemical Processes, Bind…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
Industrial Plastics: Theory and Applications
Chemical Engineering
ISBN:
9781285061238
Author:
Lokensgard, Erik
Publisher:
Delmar Cengage Learning
Unit Operations of Chemical Engineering
Chemical Engineering
ISBN:
9780072848236
Author:
Warren McCabe, Julian C. Smith, Peter Harriott
Publisher:
McGraw-Hill Companies, The