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Q1) A jacketed thermocouple initially at 20°C is immersed in boiling water. After 0.8 seconds the indicated temperature is 75°C. Later the thermocouple is removed and the indicated temperature after 1.4 seconds in air at 20°C is 60°C. Assuming that these processes can be represented as first order transfer functions calculate the time constants for indicated temperature response in boiling water and air. Why do the values in boiling water and air differ?

Q1) A jacketed thermocouple initially at 20°C is immersed in boiling water. After 0.8 seconds the indicated temperature is 75°C. Later the thermocouple is removed and the indicated temperature after 1.4 seconds in air at 20°C is 60°C. Assuming that these processes can be represented as first order transfer functions calculate the time constants for indicated temperature response in boiling water and air. Why do the values in boiling water and air differ?

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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Q1) A jacketed thermocouple initially at 20°C is immersed in boiling water. After 0.8 seconds the indicated temperature is 75°C. Later the thermocouple is removed and the indicated temperature after 1.4 seconds in air at 20°C is 60°C. Assuming that these processes can be represented as first order transfer functions calculate the time constants for indicated temperature response in boiling water and air. Why do the values in boiling water and air differ?
Transcribed Image Text:Q1) A jacketed thermocouple initially at 20°C is immersed in boiling water. After 0.8 seconds the indicated temperature is 75°C. Later the thermocouple is removed and the indicated temperature after 1.4 seconds in air at 20°C is 60°C. Assuming that these processes can be represented as first order transfer functions calculate the time constants for indicated temperature response in boiling water and air. Why do the values in boiling water and air differ?
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