Heat Loss Heat Gain

Question 1

What is the result of not balancing a house ?

Answer 1

House will have cold spots

Question 2

What is the purpose of having air conditioning?

Answer 2

Provide high level of comfort

Question 3

What are the 6 factors that must be addressed when selecting an air conditiong system

Answer 3

Noise
Temp
Humidity
Filtration
Circulation
Ventilation

Question 4

Why is it important to complete a heat loss calculation on a residence ?

Answer 4

To ensure proper size of duct and equipment

Question 5

What is the result of undersizing a heating system ?

Answer 5

Not enough warm or cold air for the area it’s providing and always running makeing it worn out faster and expensive

Question 6

What is the result of oversizing a hvac system ?

Answer 6

Excessive cost and poor temp control

Question 7

What is heat ?

Answer 7

Form of energy that flows between two body’s

Question 8

When does Tempature not flow chop to cold ?

Answer 8

When temps are the same

Question 9

What 4 factors affect a building environment ?

Answer 9

Building envelope
Occupants
Appliances
Mechanical systems

Question 10

What separates the indoor from outdoor environment?

Answer 10

Foundation
Exterior walls
Windows
Doors
Vapour Barrie’s
Floors and ceilings

Question 11

The building envelope reduces 3 losses from the outdoor environment. What are they ?

Answer 11

Radiative
Conductive
Convective

Question 12

How much heat do occupants generate ?

Answer 12

250btuh
73 watts

Question 13

What else adds heat to a building ?

Answer 13

Space heaters
Water heaters
Stoves
Fireplaces
Dryers
Lights

Question 14

Can wind affect comfort ?

Answer 14

Yes

Question 15

What are 3 methods of heat transfers ?

Answer 15

Conduction
Convection
Radiation

Question 16

Where does heat transfer occur ?

Answer 16

Exposed walls above and below grade
Partitions
Windows and doors
Ceilings and floors
Infiltration

Question 17

What is infiltration ?

Answer 17

How unconditioned air enters a conditioned space

Question 18

What is effective Tempature ?

Answer 18

How a person feels at a set temperature

Question 19

What is air temperature controlled by ?

Answer 19

Thermostat

Question 20

Does a higher relative humidity percentage cause you to feel warmer or colder ?

Answer 20

Warmer

Question 21

What is the outdoor winter design Tempature ?

Answer 21

72 degrees Fahrenheit in all living spaces

65 Fahrenheit in unconditioned basements

59 Fahrenheit in heated crawl spaces

Question 22

What do we use for winter design conditons ?

Answer 22

January at 2.5

Question 23

What is the design Tempature difference also know as delta t ?

Answer 23

The difference between indoor and outdoor design Tempatures

Question 24

What is region adjustment ?

Answer 24

Value placed on a design temperature as a percentage

Question 25

What are the three diffrent ways to calculate heat loads ?

Answer 25

Whole house loads Floor by floor loads Room by room loads

Question 26

What’s the most accurate way to calculate heat loads ?

Answer 26

Room by room

Question 27

What is htm and how is it calculated ?

Answer 27

A factor used to calculate the amount of heat energy transfers per square foot Design temp difference divided by total resistance

Question 28

What are 3 diffrent types of site exposure?

Answer 28

Unexposed Partially exposed (means 2 or more sides exposed) Fully exposed

Question 29

What are the 3 different types of air tightness ?

Answer 29

Loose construction Average construction Tight construction

Question 30

What is pickup for set back ?

Answer 30

Add an extra 10% to the heat loss calculation

Question 31

What is definition of a gross wall exposed wall ?

Answer 31

Full length x full height including all penetrations

Question 32

How do we calculate net exposed wall ?

Answer 32

Gross wall area minus doors and windows

Question 33

What four things affect loads on a building in the summer when calculating heat gain ?

Answer 33

Solar radiation Mass effect Internal gains Latent heat factors

Question 34

What is the summer indoor design Tempature ?

Answer 34

75 degrees Fahrenheit

Question 35

What is mass effect?

Answer 35

As building materials are heated by the sun they absorb the heat causing the Tempature to rise quickly

Question 36

What are solar adjustments made to ?

Answer 36

Heat gain design tempatures

Question 37

When must solar adjustments be made ?

Answer 37

If the mean Tempature range is greater than 15 degrees Fahrenheit or 8 degrees Celsius