Podcast
Questions and Answers
What is the purpose of the parameter 'Met' in the context of heat exchange between the human body and its environment?
What is the purpose of the parameter 'Met' in the context of heat exchange between the human body and its environment?
- Estimating the heat exchange between the human body and the environment
- Quantifying the metabolism of a person resting in a sitting position under thermal comfort conditions (correct)
- Expressing the heat lost through evaporation and respiration from the skin
- Measuring the insulation of a clothing system for an average male in a ventilated room
How is the 'Clo' parameter related to the 'Met' parameter?
How is the 'Clo' parameter related to the 'Met' parameter?
- It represents the heat lost through evaporation and respiration from the skin
- It is defined as the insulation required to maintain a sitting-resting average male comfortable in a normally ventilated room (correct)
- It measures the metabolic heat generation in W/m2
- It indicates the heat transmitted through clothing to maintain thermal comfort
What is the relationship between 1 Met and the heat generation of a person sitting quietly?
What is the relationship between 1 Met and the heat generation of a person sitting quietly?
- 1 Met = 38 kcal/m2 h
- 1 Met = 50 kcal/m2 h (correct)
- 1 Met = 58.2 W/m2
- 1 Met = 24 % of metabolic heat
What percentage of the metabolic heat is lost through evaporation and respiration, according to the given assumptions?
What percentage of the metabolic heat is lost through evaporation and respiration, according to the given assumptions?
In the context of clothing insulation, what does 1 Clo represent?
In the context of clothing insulation, what does 1 Clo represent?
Study Notes
Thermal Transmission Parameters
- Thermal resistance is a fundamental parameter in understanding thermal transmission
- Thermal resistance of textile material is measured in SI units as °Km2/W
Definition of Thermal Resistance
- Thermal resistance is defined as the ratio of temperature difference between two faces of fabric (∆T in °K) to the rate of heat transmission (q in W/m2)
- Thermal resistance = ∆T / q = °K/Wm2 = °Km2/W
- Reciprocal of heat flux is equal to thermal resistance
- Heat flux is measured in units of W/m2K
Practical Units of Thermal Resistance
- Tog is a practical unit of thermal resistance, equal to 1/10 of the SI unit (1 Tog = 1/10 m2°K/W)
- Clo is another practical unit used specifically for cold climate clothing, equal to 1.55 × Tog
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Description
Learn about the thermal resistance of textile materials, measured in °Km2/W, and how it is defined as the ratio of temperature difference between two faces of fabric to the rate of heat transmission. This knowledge is essential for interpreting thermal transmission data and testing methods.
