Deck 42: Heat Gain and Heat Loss in Buildings

Question 1

Which of the values given below corresponds to a wall with the highest resistance to the pass of heat?

A) R-value = 0.80.
B) U-value = 1.50.
C) U-value = 0.80.
D) R-value = 1.00.

Answer 1

C

Question 2

The total heat loss for a structure is simply the sum of the heat losses experienced by all of the construction elements that make up a particular structure.

Answer 2

True

Question 3

The cfm is found by: ____.

A) cfm (infiltration) = (ACH ÷ HOUSE VOLUME) × 60 min/h
B) cfm (infiltration) = (ACH × HOUSE VOLUME) ÷ 60 min/h
C) cfm (infiltration) = (ACH + HOUSE VOLUME) ÷ 60 min/h
D) cfm (infiltration) = (ACH × HOUSE VOLUME) × 60 min/h

Answer 3

B

Question 4

Very little heat is lost through the roof.

Question 5

The term ____ is used to describe walls or portions of walls that are below ground level.

A) under grade
B) below grade
C) level grade
D) wall grade

Question 6

The two important factors that affect the U-value for the below-grade portion of the wall are the materials used to construct the wall and how far below grade the floor is.

Question 7

If a material has an R-value of 30, then the corresponding U-value will be ____.

A) 0.033
B) 0.33
C) 33
D) 330

Question 8

The heat transfer rate through a window is found through: ____.

A) Q = U-value + TD + Area
B) Q = U-value + TD × Area
C) Q = U-value × TD + Area
D) Q = U-value × TD × Area

Question 9

One of the most commonly used characteristics of building construction materials is the ____-value.

A) P
B) T
C) R
D) Z

Question 10

The sensible heat portion of the duct load can be calculated as: ____.

A) Q_{SENSIBLE DUCT LOAD} = Envelope Load + Duct Load Factor / Duct Insulation Correction
B) Q_{SENSIBLE DUCT LOAD} = Envelope Load × Duct Load Factor + Duct Insulation Correction
C) Q_{SENSIBLE DUCT LOAD} = Envelope Load × Duct Load Factor × Duct Insulation Correction
D) Q_{SENSIBLE DUCT LOAD} = Envelope Load / Duct Load Factor × Duct Insulation Correction

Question 11

As the ____ increases, the rate of heat transfer from one side of the structure to the other will increase.

A) air temperature
B) heat differential
C) temperature
D) temperature differential

Question 12

Construction materials have a minor effect on the rate of heat transfer through the structural envelope.

Question 13

The total heat loss for the basement walls is the product of the heat losses for the below-grade and above-grade walls.

Question 14

For calculating the heat gain from appliances, the guideline typically applied to a house with only a refrigerator and a vented cooking surface is ____ Btu/h.

A) 600
B) 1200
C) 2400
D) 3600

Question 15

When it comes to sizing air conditioning and heating equipment bigger is definitely better.

Question 16

The temperature on both sides of an exterior wall or panel is needed to help determine how much heat is entering or leaving the structure.

Question 17

The most basic heat gain and heat loss calculations are based solely on the ____ of the space being conditioned.

A) location
B) height
C) circumference
D) area

Question 18

The ____-value is typically used to rate the thermal resistance of  insulation materials.

A) P
B) T
C) R
D) U

Question 19

The net wall area can be expressed mathematically as: ____.

A) Gross Wall Area = Net Wall Area - Door Area + Window Area + Area of other components
B) Net Wall Area = Gross Wall Area + Door Area + Window Area + Area of other components
C) Net Wall Area = Gross Wall Area - Door Area - Window Area - Area of other components
D) Gross Wall Area + Net Wall Area = Door Area - Window Area - Area of other components

Question 20

Oversized air conditioning equipment will cool the space faster.

Question 21

The _____________________-value describes the thermal conductivity of a material.

Question 22

The ____________________ is simply the sum of the individual heat losses of the structure.

Question 23

List two negative effects that oversized air conditioning equipment may have.

Question 24

The walls of a structure make up a large portion of the ____________________ or shell of the structure.

Question 25

The heat gain on a structure can be summarized as the sum of the conduction loads, the internal loads, the solar loads and the infiltration loads.

Question 26

What should be taken into account when performing a heat gain or heat loss calculation?

Question 27

The U-value and the ____________________ are inverses of each other.

Question 28

If a wall of a structure is comprised of a number of different materials, how is the R-value determined?

Question 29

There are different methods to calculate the heat gain on a structure based on the type of house and the number of wall exposures it has.

Question 30

Identify four ways that heat losses from the conditioned space can occur.

Question 31

Probably the easiest way to determine what size lumber was used to frame a house is to inspect the _____________________.

Question 32

The term that is used to describe the area of a wall before any doors or windows are cut into it is ____________________.

Question 33

Identify four ways that heat gains in the conditioned space can occur.

Question 34

____________________ walls are walls that separate a conditioned interior space from an unconditioned interior space.

Question 35

The occupants of a house do not add to the heat gain of the structure.