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It is a common experience to feel 'chilly' in winter and 'warm' in summer in our homes even when the thermostat setting is kept the same. This is due to the so-called 'radiation effect' resulting from radiation heat exchange between our bodies and the surrounding surfaces of the walls and the ceiling. (a) Briefly discuss another ONE heat transfer mechanism between the human body and the environment in maintaining healthy human body temperature at 37°ċ while the temperature and the humidity of the environment change with time. (b) Explain how a person can keep cooler in summer and warmer in winter. (c) Consider a person whose exposed surface area is 1.7 m2, emissivity is 0.5, and surface temperature is 32°C. Determine the rate of heat loss from that person by radiation in a large room having walls at a temperature of two situations of 280 K and 300 K. Use Stefan-Boltzmann constant as 5.67 x 10-8 W/m2-K*.

It is a common experience to feel 'chilly' in winter and 'warm' in summer in our homes even when the thermostat setting is kept the same. This is due to the so-called 'radiation effect' resulting from radiation heat exchange between our bodies and the surrounding surfaces of the walls and the ceiling. (a) Briefly discuss another ONE heat transfer mechanism between the human body and the environment in maintaining healthy human body temperature at 37°ċ while the temperature and the humidity of the environment change with time. (b) Explain how a person can keep cooler in summer and warmer in winter. (c) Consider a person whose exposed surface area is 1.7 m2, emissivity is 0.5, and surface temperature is 32°C. Determine the rate of heat loss from that person by radiation in a large room having walls at a temperature of two situations of 280 K and 300 K. Use Stefan-Boltzmann constant as 5.67 x 10-8 W/m2-K*.

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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It is a common experience to feel 'chilly’ in winter and 'warm' in summer in our homes even when the thermostat setting is kept the same. This is due to the so-called 'radiation effect' resulting from radiation heat exchange between our bodies and the surrounding surfaces of the walls and the ceiling. (a) Briefly discuss another ONE heat transfer mechanism between the human body and the environment in maintaining healthy human body temperature at 37°c while the temperature and the humidity of the environment change with time. (b) Explain how a person can keep cooler in summer and warmer in winter. (c) Consider a person whose exposed surface area is 1.7 m², emissivity is 0.5, and surface temperature is 32°C. Determine the rate of heat loss from that person by radiation in a large room having walls at a temperature of two situations of 280 K and 300 K. Use Stefan-Boltzmann constant as 5.67 x 10-8 W/m²-K*. (d) Briefly discuss the radiation heat transfer with respect to temperature change hased from your answer in Question 3(c).
Transcribed Image Text:It is a common experience to feel 'chilly’ in winter and 'warm' in summer in our homes even when the thermostat setting is kept the same. This is due to the so-called 'radiation effect' resulting from radiation heat exchange between our bodies and the surrounding surfaces of the walls and the ceiling. (a) Briefly discuss another ONE heat transfer mechanism between the human body and the environment in maintaining healthy human body temperature at 37°c while the temperature and the humidity of the environment change with time. (b) Explain how a person can keep cooler in summer and warmer in winter. (c) Consider a person whose exposed surface area is 1.7 m², emissivity is 0.5, and surface temperature is 32°C. Determine the rate of heat loss from that person by radiation in a large room having walls at a temperature of two situations of 280 K and 300 K. Use Stefan-Boltzmann constant as 5.67 x 10-8 W/m²-K*. (d) Briefly discuss the radiation heat transfer with respect to temperature change hased from your answer in Question 3(c).
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