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Thied Year TQ REVIEW > Heat Loss Heat Gain > Flashcards

Heat Loss Heat Gain Flashcards

1
Q

What is the result of not balancing a house ?

A

House will have cold spots

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2
Q

What is the purpose of having air conditioning?

A

Provide high level of comfort

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3
Q

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

A

Noise
Temp
Humidity
Filtration
Circulation
Ventilation

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4
Q

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

A

To ensure proper size of duct and equipment

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5
Q

What is the result of undersizing a heating system ?

A

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

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6
Q

What is the result of oversizing a hvac system ?

A

Excessive cost and poor temp control

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7
Q

What is heat ?

A

Form of energy that flows between two body’s

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8
Q

When does Tempature not flow chop to cold ?

A

When temps are the same

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9
Q

What 4 factors affect a building environment ?

A

Building envelope
Occupants
Appliances
Mechanical systems

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10
Q

What separates the indoor from outdoor environment?

A

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

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11
Q

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

A

Radiative
Conductive
Convective

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12
Q

How much heat do occupants generate ?

A

250btuh
73 watts

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13
Q

What else adds heat to a building ?

A

Space heaters
Water heaters
Stoves
Fireplaces
Dryers
Lights

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14
Q

Can wind affect comfort ?

A

Yes

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15
Q

What are 3 methods of heat transfers ?

A

Conduction
Convection
Radiation

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16
Q

Where does heat transfer occur ?

A

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

17
Q

What is infiltration ?

A

How unconditioned air enters a conditioned space

18
Q

What is effective Tempature ?

A

How a person feels at a set temperature

19
Q

What is air temperature controlled by ?

A

Thermostat

20
Q

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

A

Warmer

21
Q

What is the outdoor winter design Tempature ?

A

72 degrees Fahrenheit in all living spaces

65 Fahrenheit in unconditioned basements

59 Fahrenheit in heated crawl spaces

22
Q

What do we use for winter design conditons ?

A

January at 2.5

23
Q

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

A

The difference between indoor and outdoor design Tempatures

24
Q

What is region adjustment ?

A

Value placed on a design temperature as a percentage

25
Q

What are the three diffrent ways to calculate heat loads ?

A

Whole house loads
Floor by floor loads
Room by room loads

26
Q

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

A

Room by room

27
Q

What is htm and how is it calculated ?

A

A factor used to calculate the amount of heat energy transfers per square foot

Design temp difference divided by total resistance

28
Q

What are 3 diffrent types of site exposure?

A

Unexposed
Partially exposed (means 2 or more sides exposed)

Fully exposed

29
Q

What are the 3 different types of air tightness ?

A

Loose construction
Average construction
Tight construction

30
Q

What is pickup for set back ?

A

Add an extra 10% to the heat loss calculation

31
Q

What is definition of a gross wall exposed wall ?

A

Full length x full height including all penetrations

32
Q

How do we calculate net exposed wall ?

A

Gross wall area minus doors and windows

33
Q

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

A

Solar radiation
Mass effect
Internal gains
Latent heat factors

34
Q

What is the summer indoor design Tempature ?

A

75 degrees Fahrenheit

35
Q

What is mass effect?

A

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

36
Q

What are solar adjustments made to ?

A

Heat gain design tempatures

37
Q

When must solar adjustments be made ?

A

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

Thied Year TQ REVIEW (6 decks)

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