Mrs. Fernandez handled Calculus I with 50 students. She entered the classroom thatis about 10 meters wide by 12 meters long and a ceiling of 3 meters and immediatelystarted to discuss the first chapter. Six of her students were absent. The room isinsulated and completely sealed. Each person gives off 140kcal per hour of heat andoccupies a volume of 0.25 cu meter. The room has an initial pressure of 101.325kPaand temperature of 15°C. Calculate the room temperature after 5 minutes.

Given Dimensions of the insulated and sealed room =10 m x12 m x 3 m Number of students in the room=…

Answered: Mrs. Fernandez handled Calculus I with…

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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Similar questions

A thermometer having a time constant of 100 second is at steady state temperature of 30 °C. At time t=0 the thermometer placed in a temperature bath maintained at 39 °C. Determine the time needed for the thermometer to read 35 °C
Forced air at T = 25°C and V = 10 m/s is used to cool electronic elements on a circuit board. One such ele- ment is a chip, 4 mm X 4 mm, located 120 mm from the leading edge of the board. Experiments have revealed that flow over the board is disturbed by the elements and that convection heat transfer is correlated by an expression of the form Nu,= 0.04 Re0.85 P.1/3 V. T uz bog fr dW ninin tol 1 = 4 mm Chip Board 0:00 Wira L= 120 mm Estimate the surface temperature of the chip if it is dis- sipating 30 mW.
The liquid food is flowed through an uninsulated pipe at 90 ° C. The product flow rate is 0.25 kg / s and has a density of 1000 kg / m³, a specific heat of 4 kJ / (kg K), a viscosity of 8 x 10-6 Pa s, and a thermal conductivity of 0.55 W / (m) K). Assume that the change in viscosity is negligible. The internal diameter of the pipe is 25 mm with a thickness of 3 mm made of stainless steel (k = 15 W / [m ° C]). The outside temperature is 15 ° C. If the outer convective heat transfer coefficient is 18 W / (m² K), calculate the heat loss at steady state per meter pipe length. a. Find the convection coefficient in the pipe = AnswerW / m² ° C. b. Calculate heat loss per meter pipe length = Answerwatt.
A- A grown man holds two metal balls with 5kg of mass in his both hands in one level. He started climbing a stair. Assuming a 20% mechanical efficiency in climbing stairs. In the middle of the stairs there is a fan that blows air with temperature of 25 °C, if the man body temperature is 39 °C, due to action he does. The sweat helped to keep his temperature at constant level. How much does the internal energy decrease when the man mass 65 kg and climbs a 15 m high of stairs? How much thermal energy does the person transfer to the environment as exhaust heat? What does the work the man does if he is climbing in speed of 2 m/s?. Assume the man volume is 0.25 m³.
c) An air preheater, hot gases (1 bar, 350°C). Hot gas was flow in a 5 cm diameter tubes with a velocity of 1 m/s flow were used to heating air at 30°C. Determine the length of pipe required and the friction pressure drop of hot gas. To reduce the temperature to 200°C (Hint. used iteration methods and property values of hot gases is equal to properties of air)
Ex:Calculate the critical radius of insulation for asbestos with k = 0.17 W/(m.K) surrounding a pipe and exposed to room air at 20°C with h=3 W/(m2 .K). Calculate the heat loss from a 5 cm diameter pipe with a outer surface temperature of 100°C when covered with the critical radius of insulation and without insulation. (Ans: roc=5.67 cm; Qwith insulation = 47 W/m; Qwithout insulation = 37.7 W/m)

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