Forced-Air Heating Fundamentals

Question 1

The practice of using materials and processes that lower energy costs, reducing operating and maintenance costs, increasing productivity, and decreasing pollution is known as ____ design.

Answer 1

sustainable

Question 2

The increase of heat within a space that results from solar radiation or heat radiated by other sources is referred to as ____.

Answer 2

heat gain

Question 3

The transfer of heat form inside to outside by means of conduction, convection, and radiation through all surfaces is known as ____.

Answer 3

heat loss

Question 4

Designing a building to reduce heat transfer can be described as making a building envelope ____.

Answer 4

tight

Question 5

The amount of heat that must be added or removed from a space in order to maintain the desired temperature in that space is referred to as the ____.

Answer 5

heat load

Question 6

For the purpose of sizing a system, the maximum heat load is determined for a period of ____.

Answer 6

1 hour

Question 7

An example of a building’s latent heat load would be ____.

Answer 7

sweating humans and animals.

***moisture evaporating or condensing

Question 8

Heat leakage is the heat that is conducted through the walls, ceilings, and floors when there is a(n) ____ between the spaces,

Answer 8

temperature difference

Question 9

(T/F) When the temperature outside a conditioned space is lower than the temperature inside the space, heat leakage results in heat gain.

Answer 9

False

It results in heat loss.

Question 10

Calculating the total heat leakage for a space requires ____.

Answer 10

determining the types of materials through which heat is leaking

calculating how much heat is leaking

determining the surface area of each type of material

Question 11

Heat distribution for conditioned spaces in HVAC systems is primarily done through what methods?

Answer 11

Forced-air
Hydronic
Radiant

Question 12

In a forced-air system, the component responsible for delivering heated air to the conditioned space is the ____.

Answer 12

blower

Question 13

A furnace’s heat exchanger is where heat is transferred from ____.

Answer 13

combustion gases or electric elements to circulating indoor air

Question 14

A secondary heat exchanger differs from a primary heat exchange in that it ____.

Answer 14

transfers both sensible and latent heat

Question 15

For belt-driven indoor blowers, as the size of the pulley on the motor increases, the blower speed ____.

Answer 15

increases

Question 16

For belt-driven indoor blowers, as the size of the pulley on the blower increases, the blower speed ____.

Answer 16

decreases

Question 17

A furnace is considered modulating because it can ____.

Answer 17

vary its heat output from 40% to 100% of its total capacity

Question 18

Negative pressure in a building can cause ____ around doors and windows.

Answer 18

infiltration

Question 19

Building codes may require the use of makeup air units for the purpose of preventing ____ form developing in a house.

Answer 19

negative pressure

Question 20

A thermostatic blower control may delay turning on a blower until the plenum is ____ and also not turn off until the plenum is ____.

Answer 20

140 degrees F

90 degrees F