Chapter 16
an air ____ factor is a value that represents the number of times per hour that the air in a building is completely replaced by outdoor air
change
in a ___ building, the estimate of the number of occupants is based on the area (in square feet) of floor space required per person and the activity level of the person
commerical
a building ____ is a main part of a building structure such as the exterior walls
component
____ factors are expressed in Btu per hour per square foot of material per degrees Fahrenheit temperature different through the material
conduction
solar gain is only used when calculating _____
cooling loads
_____ temperature is the temperature of the air at a predetermined set of conditions
design
outdoor ___ temperature is the expected outdoor temperature that a heating or cooling load must balance
design
_____ is the difference between the desired indoor temperature and the outdoor temperature for a particular season
design temperature difference
____ is the geographic direction a wall faces
exposure
equivalent temperature difference is the design temperature difference, which is adjusted for heat gain from appliances
false
estimating the number of people occupying a residential building and estimating the number of people occupying a commercial building are done with the same method
false
infiltration occurs when air flows through a furnace filter
false
solar gain on walls and ceilings is combined with conduction gain in all factor tables
false
the winter dry bulb temperature is the coldest temperature expected in January for any given location
false
when calculating the area of a ceiling, all overhands are included
false
when the sun shines on an exterior surface of a building or opaque object inside a building, the solar energy becomes chemical energy
false
____ wall area is the total area of the wall including windows, doors, and other openings
gross
factors are numerical values that represent the ____ produced or transferred under some specific condition
heat
a ____ factor is a conduction factor multiplied by a design temperature difference
heat transfer
____ is the amount of heat lost by a building
heating load
____ is the process that occurs when outdoor air is brought into a building
infiltration
_____ air is air that flows into a building when exterior doors are open or when air leaks through cracks around doors, windows, or other openings
infiltration
____ forms are documents that are used by design technicians for arranging the heating and cooling load variables and factors
load
a ____ form has headings at the top for the job name, date of the calculations, name of the person who prepared the form, and design temperatures
prepared
the most accurate way to calculate heat gain from ventilation air is by use of a _____ chart
psychrometric
_____ gain is heat gain caused by radiant energy from the sun that strikes opaque objects
solar
a ___ bulb temperature is the warmest dry bulb temperature expected to occur in an area while disregarding the highest temperature that occurs in 1% to 5% of the total hours in the three hottest months of the year
summer dry
temperature ____ is the difference between the set point temperature and the actual temperature
swing
heat gain from appliances is calculated by multiplying the ____ of the appliance by 3.41
total wattage
a conduction factor (U) is a number that represents the amount of heat that flows through a building because of a temperature difference
true
any device that produces heat inside a building must be compensated for by a cooling load
true
exposed surfaces are building surfaces that are exposed to outdoor temperatures
true
factors include heat loss or gain from conduction, infiltration, ventilation, people, electricity used for lights, electricity or fuel used for operating appliances, and solar energy
true
heating and cooling loads are calculated either manually or by a computer
true
heating and cooling loads occur because of a difference between the indoor temperature and outdoor temperature, infiltration or ventilation in the building, and internal loads
true
net well area is the area of a wall after the area of windows, doors, and other openings have been subtracted from gross wall area
true
outdoor design temperature is the expected outdoor temperature that a heating or cooling load must balance
true
prepared forms have multiple columns that are used to calculate loads on individual rooms or zones
true
the amount of heat given off from building occupants varies depending on the activity of the occupants
true
the volumetric flow rate of ventilation air required for a building is based on volumetric flow rate of air required per person inside the building
true
____ are data that are unique to a building relating to the specific location of the building and the specifications of the particular building
variables
_____ is the air that is brought into a building to keep building air fresh
ventilation