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24 Cards in this Set

  • Front
  • Back

Design temperature difference is the difference from indoor design temperatures to outdoor design temperatures (T or F)


Which way does heat travel?

Hot to cold

Effective temperature is defined as

How a person feels at a certain temperature

Air movement affects the temperature you feel (T or F)


What four factors affect building environments?

1) building envelope

2) mechanical systems

3) occupants

4) appliances

Which material has a greater R-value?

A) glass fibre

B) double-glazed windows

C) cement

D) sheet metal

Glass fibre

HTM is a factor used to calculate:

BTUH per square foot

Gross wall calculations are completed by multiplying:

Length x width of the wall, including all penetrations

What three factors are used to find the correct infiltration factor?

Site exposure


Air tightness

Ducts passing through unconditioned spaces must be:


All ducts passing through unconditioned spaces will have heat losses (T or F)


Radiant heat adds a load to a building (T or F)


Solar radiation will change the:

Outdoor design temperatures

What is the default used when calculating heat gains for glass?

No shades or drapes are used

1 ton of cooling = (how many BTUs per hour?)

12,000 Btuh

How many CFM is recommended by most manufacturers for cooling output?

400 CFM per minute

List four factors that you must consider when designing an HVAC system.

A) proper duct size

B) ducts running through unconditioned spaces

C) zoning for houses with special heating and cooling needs

D) combustion and dilution air

How far away from the wall should a supply air outlet be located?


What is the formula used to calculate the circulation airflow rate?

CFM = volume of the house x (1.5 air changes per hour ÷ 60 minutes)

What is the minimum number or return air inlets allowed per floor?


List the five areas where return air may not be installed

A) kitchens

B) bathrooms

C) laundry rooms

D) utility rooms

E) enclosed crawl spaces that are used to supply combustion air for furnaces or other appliances

What should the output of heat equipment be between?

100% and 140%

What should the cooling output be between?

80% and 125%

To determine cooling CFM required you would...

400 CFM x 2 tons = 800cfm