Heat Loss and Heat Gain

Question 1

What is the purpose of the air conditioning system?

Answer 1

Provide high level of comfort to the occupants.

Question 2

What are the six principles that must be addressed when selecting an air conditioning system for the house

Answer 2

Temperature.
Humidity.
Ventilation.
Filtration.
Circulation.
Noise.

Question 3

Why is it important to complete a heat loss calculation.

Answer 3

The heat loss calculation will determine the equipment sizing requirements that will have a direct impact on providing the appropriate amount of heat to maintain the designed temperature.

Question 4

How does the transfer of heat happen?

Answer 4

Always from the hotter spot to colder spot.

Question 5

What is the result of under sizing heating appliance.

Answer 5

Undersized furnace will not keep up with the heating load.

Question 6

What is the result of oversized heating appliance.

Answer 6

Result in poor temperature control and excessive operating costs.

Question 7

What is heat?

Answer 7

Heat is a form of energy that flows between two bodies due to their difference in temperature.

Question 8

Temperature will always travel from hot to col until both temperatures are the same

Question 9

What four factors affect the building environment.

Answer 9

Building envelope,
Mechanical systems
Occupants
Appliances.

Question 10

Name elements of the building envelope.

Answer 10

Exterior walls
Foundations
Roofs
Ceilings
Floors,
Windows
Doors,
Vapour barrier.

Question 11

What are the three losses reduced by building envelope

Answer 11

Radiative,
Conductive
Convective

Question 12

What is a mechanical system

Answer 12

Force used to maintain the in-balance between indoor and outdoor conditions.

Question 13

How many BTUH and WH a human generate

Answer 13

250BTUH and 73WH

Question 14

Does solar adjustment affect the Delta T

Answer 14

Yes

Question 15

Conduction

Answer 15

Direct contact with another object.

Question 16

Convection

Answer 16

Medium through liquid or gas

Question 17

Radiation

Answer 17

Electromagnetic waves

Question 18

Which have the greatest heat transfer (2)

Answer 18

Windows and doors.

Question 19

How can heat losses be caused by the mechanical system

Answer 19

Duct passing through unconditioned spaces.
Ventilation air.

Question 20

How can you describe Effective temperature.

Answer 20

How a person feels at a set temperature.

Question 21

Does air movement affect the temperature you feel?

Answer 21

Yes

Question 22

A higher RH (Relative humidity) will cause you to feel warmer.

Answer 22

Yes

Question 23

What does design temperature reference to ?

Answer 23

Both indoor and outdoor temperature requirements for design.

Question 24

At the outside winter design temperature, required heating equipment shall be capable of no less than?

Answer 24

72f (22c) in all living spaces.
65f (18c) in all unfurnished basement.
59f (15c) in all heated crawlspaces.

Question 25

ABC refer use the January 2.5 % values for winter design conditions.

Question 26

Design temperature difference is ?

Answer 26

Difference between indoor and outdoor design differences. 96F

Question 27

Room by room loads is the most accurate way to calculate heat losses.

Question 28

How would you describe Thermal Resistance (R-Value)

Answer 28

Heat flow through an object in a specific amount of time.

Question 29

Below grade walls are ?

Answer 29

More than 2feet below grade level.

Question 30

Loose

Answer 30

1950 to 1960

Question 31

Average

Answer 31

1960 to 1980

Question 32

Tight

Answer 32

1980 to Present.

Question 33

What is the pick-up and set back factor

Answer 33

add 10% to heat losses calculation.

Question 34

What affect heat gains

Answer 34

Solar Radiation
Mass Effect.
Internal Gains
Latent heat factors.

Question 35

Heat gains for

Human
Kitchen
Laundry

Answer 35

Human 250 BTUH
Kitchen 1600 BTUH
Laundry 1200 BTUH but not considered if located in a basement.

Question 36

Method to calculate heat gain and heat loss

Answer 36

Whole House.
Floor-by-floor
Room-by-room

Question 37

ABC states that the design indoor temperature for summer shall be of a maximum of?

Answer 37

75f or 24c

Question 38

Describe mass effect.

Answer 38

Radiant heat from direct sunlight will add an additional load on the building or rooms in the building. As building material are heated by the sun the absorb this heat energy, causing their temperature to rise dramatically.

Question 39

Solar Radiation.

Answer 39

The total amount of heat in the building materials and surrounding air temp will the outdoor design temp difference differently for sunny and shaded areas.