Chapter 1 Flashcards
External heat gains include those by
A. Infiltration
B. Ventilation
C. Solar Radiation
D. All of the above.
D
A wind velocity of blank is used to calculate the winter infiltration heat losses.
a. 24 kmph
b. 15 kmph
c. 30 kmph
d. 36 kmph
A
The heat given off by light fixtures is not greatly affected by the
A. Current flow
B. Room temperature
C. Wind speed
D. Ambient temperature
B
Heat losses through large single-pane window sections are ________, double-pane windows which have the space between the panes filled with argon.
A. Significantly less than.
B. Approximately the same as.
C. Significantly greater than.
D. Marginally greater than.
C
The amount of heat lost by conduction, convection, radiation, and infiltration is directly affected by the
A. room temperature,
B. room size,
C. ambient temperature,
D. wind velocity.
D
The air change method is used to
a)Determined the number of cracks in a room
b)Determine the amount of air entering a building by infiltration
c)Determine the amount of heat being lost through radiation
d)Determine the intensity of air contamination
b
ASHRAE guidelines require a minimum amount of ventilation for residential spaces based on:
a)Per type of activity
b)Per floor area
c)Per person or per floor area
d)Per person
c
Solar heat gain in a building varies with
a)The outdoor temperature
b)The Z factor
c)The season
d)The peak load
c
If a wall is composed of different areas, each with a given combination of materials, the overall U Factor is determined by
a)Summing the products of U Factor x Area of each different part of the wall and dividing the sum by the total area of the wall
b)Taking the lowest U Factor of all the parts of the wall
c)Taking an average of the U Factors of each different part of the wall
d)Taking the highest U Factor of all the parts of the wall
a
U =
a)R
b)K
c)1/R
d)RU
c
Wind speed affects heat lost by which of these mechanisms
a)Radiation
b)Conduction
c)Convection
d)All of the above
d
“Heat” is
a)Transferred by convention, conduction, and infiltration
b)The name for energy that moves spontaneously down a temperature gradient
c)Another name for temperature
d)The name for energy that moves spontaneously up a temperature gradient
b
The U factor:
a)indicates that the buildng will lose heat energy
b)indicates that the material does not have an R factorc)Indicates how effective a given type of insulation is
d)Indicates how much heat energy will flow through a given wall
d
Heat loss through a wall depends on
a)The air changes, the volume and how many windows are open
b)The wall area, the difference in temperature on either side of the wall and the U factor
c)The room volume, the difference in temperature on either side of the wall and the R Value
d)The wall area, the wind speed and the U factor
b
The wet-bulb temperature is required in order to determine the amount of heat that will pass through a given wall construction
True False
false
