FR&B 3.66. A thermostat control with dial markings from 0 to 100 is used to regulate the temperature of an oil bath. A calibration plot on logarithmic coordinates of the temperature, T(°F), versus the dial setting, R, is a straight line that passes through the points (R₁ = 20.0. T₁ = 110.0°F) and (R₂ = 40.0, T₂ = 250.0°F). (a) Derive an equation for T(°F) in terms of R. (b) Estimate the thermostat setting needed to obtain a temperature of 320°F. (c) Suppose you set the thermostat to the value of R calculated in Part (b), and the reading of a thermocouple mounted in the bath equilibrates at 295°F instead of 320°F. Suggest several possible explanations.
FR&B 3.66. A thermostat control with dial markings from 0 to 100 is used to regulate the temperature of an oil bath. A calibration plot on logarithmic coordinates of the temperature, T(°F), versus the dial setting, R, is a straight line that passes through the points (R₁ = 20.0. T₁ = 110.0°F) and (R₂ = 40.0, T₂ = 250.0°F). (a) Derive an equation for T(°F) in terms of R. (b) Estimate the thermostat setting needed to obtain a temperature of 320°F. (c) Suppose you set the thermostat to the value of R calculated in Part (b), and the reading of a thermocouple mounted in the bath equilibrates at 295°F instead of 320°F. Suggest several possible explanations.
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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Transcribed Image Text:FR&B 3.66. A thermostat control with dial markings from 0 to 100 is used to regulate the
temperature of an oil bath. A calibration plot on logarithmic coordinates of the temperature, T(°F),
versus the dial setting, R, is a straight line that passes through the points (R₁ = 20.0. T₁ = 110.0°F) and
(R₂ = 40.0, T₂ = 250.0°F).
(a) Derive an equation for T(°F) in terms of R.
(b) Estimate the thermostat setting needed to obtain a temperature of 320°F.
(c) Suppose you set the thermostat to the value of R calculated in Part (b), and the reading of a
thermocouple mounted in the bath equilibrates at 295°F instead of 320°F. Suggest several possible
explanations.
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