What is the definition of thermal comfort?

Why did groups look into thermal comfort?

Scale of being too cold:

Scale of being too hot:

What are the 2 models and what does each do?

Definition of the heat balance model:

The heat balance model only applies to non-free running buildings i.e. buildings with aircon or heating.
What else does it consider?

Show table of key comfort variables:

Name the key physical and environmental comfort variables:

What can effect the natural convective boundary layer?

Activity level:

- What depends on activity level?

- What is 1 met =?

- Average surface area of an adult

- Thus 1 met also equals?

Activity level:

- Examples of metabolic activity

Thermal insulation of clothing:

- What is clo?

- What does 1 close equal and what is an example?

Thermal insulation of clothing:

- Typical clo values

Air temperature (dry-bulb):

- How important?
- What does it affect?
- What is free and forced convection?

Air temperature (dry-bulb):

- Another influence of air temperature is from dry reparation heat loss, how does this arise and what is it proportional too?

Mean radiant temperature:

- What does it represent?

- How sensitive?

- What does this mean?

Mean radiant temperature:

- As velocity increases...

- Examples?

Air velocity:

- What does it influence?

- When does forced convection?

- Excess heat?

- What is freshness?

- What areas are most sensitive?

Humidity:

- What does it affect, and therefore..?

- When it is most significant?

Humidity:

What are the 3 humidity moisture evaporation processes?

Humidity:

- Rule of thumb for relative humidity?

- If humidity is too high?

- If humidity is too low?

Write expression which expresses the balance of metabolic heat production with the conductive, convective, radiant and evaporative heat dissipation. This was produced by Fanger in his 1970 book Thermal Comfort.

What are the 3 requirements for comfort?

Conditions for comfort:

Operative temperature:

- What is it?
- What does it take into account?

Operative temperature:

Equation

Operative temperature:

- What does it verify?
- What about at higher air velocities?
- In a well insulated room?
- What is dry-bulb temperature?

Air velocity in occupied zone:

- Too high or low?
- Guide?
- Rule of thumb?

Mean radiant temperature:

- What is it?
- At the centre of the room...?
- What should it not go below?

Mean radiant temperature:

Equation

Predicted mean vote (PMV):

- What is it?
- How is it derived?
- What is it used for?
- What does it predict?
- What does it permit?

Predicted mean vote (PMV):

Scale