Heat Loss And Heat Gain

Question 1

What is the purpose of Air Conditioning?

Answer 1

The purpose of any air conditioning system is to provide a high level of comfort to the home owner.

Question 2

How many watts per BTUH? 1 kilowatt?

Answer 2

1 watt =3.4 BTUH
1kilowatt =3412 BTUH

Question 3

What are the six principles of comfort?

Answer 3

temperature, humidity, ventilation, filtration, circulation and noise.

Question 4

The transfer of heat is always….

Answer 4

From hot to cold

Question 5

Building environments are affected by what four factors?

Answer 5

building ervelope, mechanical systems, occupants and appliances.

Question 6

Approximately how much heat does one occupant generate?

Answer 6

250 BTUH - 73 Watts

Question 7

In addition to heat what else do occupants add to the environment?

Answer 7

moisture
increased levels of humidity
carbon dioxide
indoor pollutants

Question 8

What happens if you create a low pressure within the building?

Answer 8

the higher pressure air on the exterior of the building envelope will flow inward through cracks and openings.

Question 9

What are the two greatest heat losses in a house

Answer 9

Windows and doors

Question 10

Heat may be lost by the mechanical system by?

Answer 10

-ducts passing through unconditioned spaces
-ventilation air (fresh air & exhaust).

Question 11

True or false: a garage is always considered an unconditioned space?

Answer 11

True

Question 12

What does a higher relative humidity do to temperature?

Answer 12

Make it feel warmer

Question 13

How do you measure humidity?

Answer 13

Hygrometer

Question 14

What is the indoor design temperature for living spaces?

Answer 14

72F (22C)

Question 15

What is the design temperature difference for Calgary?

Answer 15

96F

Question 16

What is the most accurate way of doing a heat loss calculation

Answer 16

Room by room loads

Question 17

Below grade walls are walls that are how far below grade (ground level)?

Answer 17

More than 2’

Question 18

What would be an example of a room with a floor adjacent to an unconditioned space?

Answer 18

Bonus room (room above garage)

Question 19

Define un-exposed site

Answer 19

Sheltered other buildings trees or wind shelters on all sides

Question 20

Define partially exposed site

Answer 20

Sheltered on two or more sides by buildings, trees or wind shelters

Question 21

Define fully exposed site

Answer 21

Three or more sides are fully exposed with no shelter

Question 22

What year did tight construction of homes begin?

Answer 22

Late 1980’s

Question 23

What years are loose constructed homes?

Answer 23

1950’s to late 1960’s

Question 24

When calculating for heat gains what things within the house must be accounted for?

Answer 24

Occupants = 250 btuh/person
Kitchen =1600 btuh
Laundry =1200 btuh (not considered if in basement)

Question 25

The ABC sets temperatures for summer outside design. what factors are used?

Answer 25

July @ 2.5% dry degree C

Question 26

What is the indoor design temperature for cooling?

Answer 26

75F (24C)

Question 27

Are heat gain calculations required for below grade walls and crawl spaces?

Answer 27

No

Question 28

What is mass effect?

Answer 28

Materials within a room that are heated by the sunlight shining in

Question 29

Solar adjustments are made to the heat gain design temperatures (AT). If the range of summer design temperature is great enough, then the radiant heat from direct sunlight causing the mass effect will be affected.

Answer 29

Not sure how to write a card for that, just understand it

Question 30

Effective temperature could be defined as what?

Answer 30

How a person feels at a set temperature

Question 31

HTM is the factor used to calculate what?

Answer 31

BTUH per square foot

Question 32

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

Answer 32

Site exposure Penetrations Air tightness

Question 33

Ducts passing through unconditioned spaces must be?

Answer 33

Insulated

Question 34

Does latitude affect shade factors on a building?

Answer 34

Yes

Question 35

Does radiant heat add load to the building?

Answer 35

Yes

Question 36

What factor will solar radiation change?

Answer 36

Outdoor design temps

Question 37

What walls take on the most heat gain?

Answer 37

East or west