Air Conditioning Repair Heat Load Calculations and System Sizing

Question 1

What unit is commonly used to measure the cooling capacity of an air conditioning system?

Accepted Answer

BTU/hr

Answer

BTU/hr (British Thermal Units per hour) is the standard unit used to express the cooling capacity of air conditioning equipment on nameplates and specifications.

Question 2

How many BTU/hr are equivalent to one ton of refrigeration?

Accepted Answer

12,000

Answer

One ton of refrigeration equals 12,000 BTU/hr, which originated from the amount of heat needed to melt one ton of ice in 24 hours.

Question 3

What is ACCA Manual J used for in the HVAC industry?

Accepted Answer

Performing residential load calculations

Answer

ACCA Manual J is the industry-standard method for calculating residential heating and cooling loads to properly size HVAC equipment.

Question 4

Which of the following factors does NOT significantly affect a building's cooling load?

Accepted Answer

Interior wall paint color

Answer

Interior paint color has a negligible effect on cooling load; exterior surface colors can affect solar absorptance, but interior colors do not meaningfully impact heat gain.

Question 5

What is the primary consequence of installing an oversized air conditioning system?

Accepted Answer

Short cycling and poor humidity control

Answer

An oversized system reaches the thermostat setpoint too quickly, causing it to short cycle and run for insufficient time to remove humidity from the air.

Air Conditioning Repair Practice Test

Air Conditioning Repair Practice Test

Air Conditioning Repair Heat Load Calculations and System Sizing