HVAC HVAC Load Calculations 2

Question 1

What does Manual S (ACCA) provide for HVAC technicians and designers?

Accepted Answer

Residential equipment selection based on Manual J loads

Answer

ACCA Manual S guides technicians in selecting properly sized heating and cooling equipment that matches the Manual J calculated loads within acceptable tolerance ranges.

Question 2

Which of the following is an 'internal gain' source that adds to the cooling load in a building?

Accepted Answer

Occupants, lighting, and appliances

Answer

Internal gains from people, lights, and equipment add sensible and latent heat directly to the conditioned space, increasing the required cooling capacity.

Question 3

Solar heat gain through windows is accounted for in a cooling load calculation using which factor?

Accepted Answer

Solar Heat Gain Coefficient (SHGC)

Answer

The Solar Heat Gain Coefficient (SHGC) represents the fraction of solar radiation admitted through a window, used with peak solar intensity and window area to calculate solar load.

Question 4

In load calculations, 'infiltration' refers to:

Accepted Answer

Uncontrolled air leakage into the building through gaps and cracks

Answer

Infiltration is the unintended entry of outdoor air through envelope leaks, adding both sensible and latent load that must be included in Manual J calculations.

Question 5

What is the result of significantly oversizing an air conditioner based on load calculations?

Accepted Answer

Short cycling, poor humidity control, and increased wear

Answer

An oversized AC short-cycles (starts and stops frequently), never runs long enough to remove adequate moisture, causing high humidity, comfort complaints, and premature wear.

HVAC Practice Test

HVAC Practice Test

HVAC HVAC Load Calculations 2