What is Thermal Comfort?

According ANSI/ASHRAE Standard 55-2010, the thermal comfort is defined as “that condition of mind which expresses satisfaction with the thermal environment and is assessed by subjective evaluation.

People like to be work in luxury work-space and like to be in most efficient buildings with nice occupation . But these efficient buildings are then only effective when the occupants are comfortable.

In Summer or Winter season human will not feel comfort because of temperature difference will be occurs. Generally Human Feel comfort at 18°C (64°F) to 23°C (73°F) temperatures. 

These temperature is called as Ambient Temperature or Room Temperature. These Normal Air Temperature by which the human get comfort is Indicated as Thermal Comfort.

There are Six factors of Thermal Comfort they are :-

1. Air Temperature:

Air Temperature is defined as the Temperature of the air surrounding the occupant with respect to location and time.It is generally given in degrees Celsius (°C).   


Humidity referred as the amount of water vapor in the air.When the water heated up then the water will be evaporated to surrounding atmosphere in gaseous stage.Then the water levels in air will be increased these is know as Humidity. Higher humidity reduces the effectiveness of sweating in cooling the body by reducing the rate of evaporation of moisture from the skin.

3.Radiant Heat:

The Radiant Heat is derived by the average temperature of the objects and surfaces that surround us, and it depends on the material’s ability to absorb or emit heat.

4.Clothing :

Clothing insulation is the main factor for thermal comfort.It is defined as the amount thermal insulation cloths worn by human. Because it actually  influences the heat loss and consequently the thermal balance.
Wearing too much cloths causes to heat stress and while in cold conditions not wearing enough cloths may causes to cold injuries such as frostbite or hypothermia.

5.Air Velocity:

The speed of air flow on the surrounding is know as Air Velocity. The Air Velocity is an important factor in Thermal Comfort.If the Air flows in warm or humid conditions can increases the heat loss through the convection without any change in air temperature.
Where as in case cold conditions if air flows then perceived as a draught as people are particularly sensitive to these movements.

Work Rate/Metabolic heat:

Heat produced by human body is know as Metabolic heat. The Work Rate/Metabolic is an very important factor in Humans Thermal Comfort. Because when we work more heat we will release. If we more heat we released , the more heat needs to be lost so our body doesn't get  overheated.

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