ASHRAE ASHRAE Thermal Comfort and Heat Transfer

Question 1

According to ASHRAE Standard 55, what is the primary metric used to define thermal comfort?

Accepted Answer

Predicted Mean Vote (PMV)

Answer

Dry-bulb temperature only

Answer

Relative humidity only

Answer

Mean Radiant Temperature (MRT) only

Question 2

Which of the following is NOT one of the six personal and environmental factors in ASHRAE's thermal comfort model?

Accepted Answer

Outdoor ambient temperature

Answer

Metabolic rate

Answer

Clothing insulation

Answer

Air speed

Question 3

What does the term 'operative temperature' represent in ASHRAE thermal analysis?

Accepted Answer

Average of air temperature and mean radiant temperature

Answer

Dew point temperature of the supply air

Answer

Effective temperature including humidity effects

Answer

Dry-bulb temperature at the thermostat sensor

Question 4

In ASHRAE conduction heat transfer calculations, what does the R-value of a building assembly represent?

Accepted Answer

Thermal resistance per unit area

Answer

Thermal conductance per unit area

Answer

Heat flux through the assembly

Answer

Overall heat transfer coefficient

Question 5

Which ASHRAE Handbook volume is the primary reference for fundamental heat and mass transfer principles?

Accepted Answer

ASHRAE Handbook – Fundamentals

Answer

ASHRAE Handbook – HVAC Systems and Equipment

Answer

ASHRAE Handbook – Refrigeration

Answer

ASHRAE Handbook – HVAC Applications

Question 6

What is the purpose of the ASHRAE 'adaptive comfort model' in Standard 55?

Accepted Answer

To allow higher temperature ranges in naturally ventilated buildings based on outdoor conditions

Answer

To reduce mechanical cooling energy in all commercial buildings

Answer

To set stricter comfort limits for spaces with high occupant density

Answer

To define minimum ventilation rates for acceptable indoor air quality