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Questions and Answers
What is the definition of thermal comfort?
What is the unit of thermal insulation provided by garments and clothing ensembles?
What is the difference between latent heat and sensible heat?
What is the operative temperature?
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What is the effective temperature?
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What is the unit of metabolic rate?
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What is the mean radiant temperature?
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What is the relationship between latent heat and sensible heat in terms of energy required?
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What is the significance of the metabolic rate in the context of thermal comfort?
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What is the primary factor that determines the thermal insulation provided by clothing?
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What is the result of an increase in the mean radiant temperature?
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What is the operative temperature equivalent to?
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What is the purpose of the effective temperature?
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Why is the mean radiant temperature important in thermal comfort?
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What is the relationship between the operative temperature and the actual environment?
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How does the metabolic rate affect the thermal comfort?
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What is the significance of latent heat in thermal comfort?
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Why is the effective temperature important in thermal comfort?
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Study Notes
Thermal Comfort
- Thermal comfort is defined as the condition of mind that expresses satisfaction with the thermal environment, assessed by subjective evaluation.
Physical Activity
- Metabolic rate (M) is the rate of transformation of chemical energy into heat and mechanical work by metabolic activities within an organism.
- 1 met is equal to 58.2 W/m2, which is the energy produced per unit surface area of an average person, seated at rest.
Clothing Level
- Clothing level is measured in clo units, with 1 clo equal to 0.155 m2∙K/W, representing the thermal insulation provided by garments and clothing ensembles.
Sensible and Latent Heat Exchanges
- Latent heat is the energy needed to overcome intermolecular forces to trigger a phase change.
- Sensible heat is the energy needed to raise the temperature of a substance.
- More energy is required to change a matter's phase than to raise its temperature.
Derived Parameters For Measuring Thermal Comfort
- Mean Radiant Temperature (MRT) is a numerical representation of how human beings experience radiation.
- Operative Temperature is the uniform temperature of a radiantly black enclosure in which an occupant would exchange the same amount of heat by radiation plus convection as in the actual non-uniform environment.
- Effective Temperature is the combination of 50% relative humidity with the operative temperature that causes the same sensible plus latent heat exchanges as in the actual environment.
Thermal Comfort
- Thermal comfort is defined as the condition of mind that expresses satisfaction with the thermal environment, assessed by subjective evaluation.
Physical Activity
- Metabolic rate (M) is the rate of transformation of chemical energy into heat and mechanical work by metabolic activities within an organism.
- 1 met is equal to 58.2 W/m2, which is the energy produced per unit surface area of an average person, seated at rest.
Clothing Level
- Clothing level is measured in clo units, with 1 clo equal to 0.155 m2∙K/W, representing the thermal insulation provided by garments and clothing ensembles.
Sensible and Latent Heat Exchanges
- Latent heat is the energy needed to overcome intermolecular forces to trigger a phase change.
- Sensible heat is the energy needed to raise the temperature of a substance.
- More energy is required to change a matter's phase than to raise its temperature.
Derived Parameters For Measuring Thermal Comfort
- Mean Radiant Temperature (MRT) is a numerical representation of how human beings experience radiation.
- Operative Temperature is the uniform temperature of a radiantly black enclosure in which an occupant would exchange the same amount of heat by radiation plus convection as in the actual non-uniform environment.
- Effective Temperature is the combination of 50% relative humidity with the operative temperature that causes the same sensible plus latent heat exchanges as in the actual environment.
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Description
This quiz covers thermal comfort in building automation systems, including its definition and factors affecting it. It also explores physical activity and metabolic rate in relation to thermal comfort.
