HVAC Heating Systems 2

Question 1

What is a heat pump's Heating Seasonal Performance Factor (HSPF) used to measure?

Accepted Answer

The seasonal heating efficiency of a heat pump

Answer

HSPF measures the total heating output of a heat pump divided by the total electrical energy it consumes over a heating season.

Question 2

What is auxiliary (emergency) heat in a heat pump system?

Accepted Answer

Electric resistance heating that supplements or replaces heat pump heating

Answer

Auxiliary heat is typically electric resistance heating strips inside the air handler that assist the heat pump during very cold weather or emergency operation.

Question 3

At what outdoor temperature does a standard heat pump typically lose efficiency and need supplemental heat?

Accepted Answer

Below about 35-40°F (2-4°C)

Answer

Standard heat pumps begin losing significant efficiency around 35-40°F, though modern cold-climate heat pumps can operate efficiently at much lower temperatures.

Question 4

What is the purpose of a defrost cycle in a heat pump?

Accepted Answer

To remove frost that accumulates on the outdoor coil during heating mode

Answer

During cold weather, frost forms on the outdoor coil; the defrost cycle temporarily reverses the refrigeration cycle to melt this frost and maintain system efficiency.

Question 5

What type of heating system uses water as the heat transfer medium distributed through pipes to radiators or radiant floor tubing?

Accepted Answer

Hydronic heating system

Answer

A hydronic heating system uses a boiler to heat water, which is then circulated through pipes to baseboard radiators, panel radiators, or radiant floor tubing.

HVAC - Heating, Ventilation, and Air Conditioning Practice Test

HVAC - Heating, Ventilation, and Air Conditioning Practice Test

HVAC Heating Systems 2