Energy-Efficient Building Automation: Thermal Comfort
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Questions and Answers

What is the definition of thermal comfort?

  • The condition of mind which expresses satisfaction with the thermal environment and is assessed by subjective evaluation (correct)
  • The energy needed to raise the temperature of a substance
  • The numerical representation of how human beings experience radiation
  • The rate of transformation of chemical energy into heat and mechanical work by metabolic activities

    • What is the unit of thermal insulation provided by garments and clothing ensembles?

  • met
  • W/m2
  • K/W
  • clo (correct)

    • What is the difference between latent heat and sensible heat?

  • Latent heat is the energy needed to raise the temperature of a substance, while sensible heat is the energy needed to overcome intermolecular forces
  • Latent heat is the energy needed to change the phase of a substance, while sensible heat is the energy needed to change the temperature of a substance
  • Latent heat is the energy needed to overcome intermolecular forces, while sensible heat is the energy needed to raise the temperature of a substance (correct)
  • Latent heat is the energy needed to change the temperature of a substance, while sensible heat is the energy needed to change the phase of a substance

    • What is the operative temperature?

    <p>The uniform temperature of a radiantly black enclosure</p> Signup and view all the answers

    What is the effective temperature?

    <p>The combination of 50% relative humidity with the operative temperature</p> Signup and view all the answers

    What is the unit of metabolic rate?

    <p>met</p> Signup and view all the answers

    What is the mean radiant temperature?

    <p>The numerical representation of how human beings experience radiation</p> Signup and view all the answers

    What is the relationship between latent heat and sensible heat in terms of energy required?

    <p>More energy is required to change the phase of a substance than to raise its temperature</p> Signup and view all the answers

    What is the significance of the metabolic rate in the context of thermal comfort?

    <p>It affects the subjective evaluation of thermal comfort</p> Signup and view all the answers

    What is the primary factor that determines the thermal insulation provided by clothing?

    <p>Clothing level (clo) rating</p> Signup and view all the answers

    What is the result of an increase in the mean radiant temperature?

    <p>An increase in the sensible heat exchange</p> Signup and view all the answers

    What is the operative temperature equivalent to?

    <p>The average of indoor dry bulbs and MRT</p> Signup and view all the answers

    What is the purpose of the effective temperature?

    <p>To combine the operative temperature with 50% relative humidity</p> Signup and view all the answers

    Why is the mean radiant temperature important in thermal comfort?

    <p>It influences the human perception of thermal comfort</p> Signup and view all the answers

    What is the relationship between the operative temperature and the actual environment?

    <p>The operative temperature is a uniform representation of the actual environment</p> Signup and view all the answers

    How does the metabolic rate affect the thermal comfort?

    <p>It affects the thermal comfort by influencing the subjective evaluation</p> Signup and view all the answers

    What is the significance of latent heat in thermal comfort?

    <p>It is the energy required to overcome the intermolecular forces to trigger a phase change</p> Signup and view all the answers

    Why is the effective temperature important in thermal comfort?

    <p>It causes the same sensible plus latent heat exchanges as in the actual environment</p> Signup and view all the answers

    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.

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