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

ASHRAE Standard 55 uses Predicted Mean Vote (PMV) as the primary index to predict the mean thermal sensation of occupants on a seven-point scale.

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

ASHRAE's thermal comfort model uses metabolic rate, clothing insulation, air temperature, radiant temperature, air speed, and humidity—not outdoor ambient temperature.

Question 3

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

Accepted Answer

Average of air temperature and mean radiant temperature

Answer

Operative temperature is the uniform temperature of an enclosure that would result in the same heat exchange by radiation and convection as the actual non-uniform environment.

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

R-value is the thermal resistance per unit area (ft²·°F·h/Btu in IP units) and indicates how strongly a material resists conductive heat flow.

Question 5

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

Accepted Answer

ASHRAE Handbook – Fundamentals

Answer

The ASHRAE Handbook – Fundamentals covers thermodynamics, heat transfer, psychrometrics, and fluid mechanics that underpin all HVAC&R design.

ASHRAE - American Society of Heating, Refrigeration and Air Conditioning Engineers Certification Practice Test

ASHRAE - American Society of Heating, Refrigeration and Air Conditioning Engineers Certification Practice Test

ASHRAE ASHRAE Thermal Comfort and Heat Transfer