Chapter 17

for residential cooling applications, ___ Btu/hr of heat gain is used for appliances and cooking processes

1200

for a residence, the latent heat gain is ___% of the sensible heat gain

30

for residential cooling applications, heat gain from people is ___ Btu/hr of sensible heat per person with a latent heat allowance added

300

dimensions for windows and doors may be rounded to the nearest ____"

6

a summer indoor design temperature of ____ degree F is usually selected to provide comfort for a normally clothes person during summer

75

summer outdoor design temperatures are the warmest temperatures expected in an area during ____% of the summer

95

winter outdoor design temperatures are the coldest temperatures expected to occur in an area during _____% of the winter

97.5

in the ____ method, the volume of the building is found by multiplying the length times the width times the ceiling height of the building

air change

the ____ of the ceiling and floor is found by multiplying the dimensions of the rooms

area

for a residence, the number of people that occupy a building is determined by the number of ____

bedrooms

____ data is the name of each room, running feet of exposed wall, dimensions, ceiling height, and exposure of each room

building

____ load calculations are heating and cooling load calculations that are performed by a computer

computer-aided

____ is the opening around windows, doors, or other openings in a building such as between the foundation and framework of a building

crackage

a sketch of a residence contains the ___ required for calculating the heating and cooling load of the building

dimensions

the ___ factor is found by dividing the equipment capacity by the calculated load

equipment ratio

___ is the geographic direction a wall faces

exposure

for cooling load calculations, the area of windows and glass doors is calculated and entered on the form according to ____

exposure

___ are an example of a building components

exterior walls windows doors

variables and ____ are entered on a load form and are used to calculate heat losses and gains for a building

factors

a load calculation program requests different variables and factors than those used for a conventional load calculation

false

a winter indoor design temperature of 75 degrees F is usually selected to provide comfort for a normally clothes person during winter

false

all load application programs include heat loss for ductwork

false

five different methods are used to calculate the rate of infiltration of air into a building

false

heat gain through ductwork or piping is usually added in the load calculation

false

latent heat load for moisture in the air does not have to be considered in the cooling load, but it must be considered in the heating load

false

the distribution system for a job must be sized for the calculated load, not for the equipment output capacity

false

the information for the heating load is entered on the form first because more data is required for calculating heating loads than for cooling loads

false

the lighting load is calculated for a residential building because the lights are on when the cooling load occurs

false

the totals of a computer-aided load calculation should be within 1% of the totals taken from a reliable standard

false

when plans and specifications are not available for a building that is already built, the ___ of the building is sketched, and notes about the materials and construction methods are taken

floor plan

the ____ rate of infiltration air is the cooling load due to infiltration, but the actual cooling load is found on a psychrometric chart

flow

the ___ from people is not usually calculated in a heating load

heat gain

____ factors are used for calculating heat flow through individual components of a building

heat transfer

the air change method is based on the assumption that ___ air completely changes the air in a building

infiltrated

factors used in calculating heating and cooling loads include conduction factors, solar gain, ____ factors, and factors for heat produced by peoples, lights, and appliances

infiltration

most load calculating programs usually begin by requesting general information such as the ____, geographical location, and design temperatures

job

a ____ software program is a series of commands that requests data from the operator and manipulates the data to determine the heating and cooling loads

load calculation

design temperature is the temperature of the air at a ___ set of conditions

predetermined

to oversize heating and air conditioning equipment components, an equipment ___ factor is used

ratio

____ are written supplements to plans that describe the materials used for a building

specifications

the total loads from the computer program can be compared with a ___ for the type and location of the building or with a load calculated with the conventional method for a part of the building

standard

heat transfer is due to a ___ difference between the two sides of a material

temperature

Conventional load calculations are performed manually

true

because different factors are used for each load calculation method, there is usually some difference between computer-aided load figures and conventional load figures

true

design temperature difference is the difference between the indoor design temperature and the outdoor design temperature

true

ductwork and piping in cooling systems should always be insulated to reduce heat gain

true

gross wall area is calculated separately for each exposed wall of the building

true

hallways, closets, stairways, and other spaces in a building not part of a room or zone are included in the dimensions of adjacent rooms or zones

true

most commercial computer load calculation programs are written so a printout of the results shows subtotals of losses or grains for the rooms or zones in a building

true

most load calculation program instructions include a job information sheet

true

plans are drawings of a building that show dimensions, construction materials, location, and arrangement of the spaces within a building

true

since furnaces and air conditioners are manufactured in a limited selection of sizes, the equipment chosen for a job is usually oversized for the loads

true

the information for calculating the area of windows and glass doors is found on sketches or plans of a building

true

the net area of exposed walls is found by subtracting the area of windows and door from the gross exposed wall area for each room

true

the results of a computer load calculation program are assumed to be correct

true

to obtain the actual heating and cooling loads for a building, adjustments have to be made to totals

true

total heat loss or gain for a building is the sum of all the room or zone subtotals

true

when using a table of infiltration factors that is based on crackle, the total amount of crackle (in feet) is multiplied by the appropriate factor

true

if any part of the ductwork or piping system in a building runs through a ___ space, heat will be lost and will, therefore, be added to the heating load of the building

unconditioned

____ used in calculating heating and cooling loads include design temperature differences, area of building components, data for calculating infiltration or ventilation loss or gain, number of people occupying the building, and number of lights and appliances in the building

variables

using the air change method, the rate of infiltration of air into a building is calculated by multiplying the ___ of the building by a factor related to the number of times air change occurs per hour

volume

dimensions for ____ may be rounded to the nearest 6"

walls ceilings floors

gross wall area is the total wall area including ____

windows doors openings