Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
46 Cards in this Set
- Front
- Back
|
temperature, humidity, airflow, air quality, radiant effects all are factors that effect...
|
comfort
|
|
|
there is no evaporation if the air is...
|
saturated
|
|
|
a wet bulb thermometer will measure the same as a dry bulb thermometer if...
|
the air is saturated
|
|
|
a measure of sensible heat
|
temperature
|
|
|
a measure of latent heat
|
water vapor
|
|
|
air conditioners remove...
|
sensible and latent heat
|
|
|
latent heat includes...
|
humidity
|
|
|
heat gains through...
|
walls, roof, windows
|
|
|
how does glazing on windows effect heat
|
increases
|
|
|
thermal resistance (R values) are...
|
cumulative numberst
|
|
|
are U-factors cumulative
|
no
|
|
|
shading coefficient for clear class is..
|
1.0
|
|
|
can you over-insulate
|
yes
|
|
|
over insulation results in not being
|
energy efficient
|
|
|
for energy efficiency what should you do with glass
|
keep it to a minimum
|
|
|
for energy efficiency, you should avoid ____ & ____ orientation
|
east & west
|
|
|
___________ are used to produce signals for adjusting systems to maintain desired conditions
|
controllers
|
|
|
most controls in institutional buildings are...
|
DDC (direct digital controls)
|
|
|
_______: valves and dampers are used to adjust flow in response to controller signals
|
actuators
|
|
|
__________ send signal to an ________
|
controllers, actuators
|
|
|
these are basically small air handling units located in or above conditioned spaces
|
fan coils
|
|
|
chilled water or hot water circulated through piping, encased in floor or at ceiling
|
radiant heating or cooling
|
|
|
provides heating and cooling and needs separate air system for ventilation
|
radiant heating or cooling
|
|
|
window or through wall units complete with compressor and optional electric heat. needs outside wall
|
package terminal air conditioners
|
|
|
the lower comfort level in cold weather is at __ F and __% RH
|
68 degrees
30% relative humidity |
|
|
the upper comfort level in hot weather is at __F and __% RH
|
79 degrees
55% RH |
|
|
an interior design temperature of about __ F is considered comfortable
|
75 degrees
|
|
|
what deals with properties of air + water vapor mixtures
|
psychrometry
|
|
|
Temperature At Which Moisture Will Condense From A Given Air Sample
|
dew point
|
|
|
enthalpy is also known as
|
total heat
|
|
|
Similar To Fancoils, Except Units Are Reverse Cycle Heatpumps
|
water source heat pumps
|
|
|
Use Refrigeration Process To Extract Or Reject Heat For Cooling Or Heating
|
water source heat pumps
|
|
|
high humidity is >__%
|
greater than 60%
|
|
|
uncomfortable drying (humidity) is less than __-__%
|
less than 25-30%
|
|
|
an area for which temperature is controlled by a single thermostat.
|
HVAC zone
|
|
|
areas of humidity control can be termed a
|
HVAC zone
|
|
|
these two things reverse the refrigeration to heat as well as cool
|
water source heat pumps
package terminal units |
|
|
these are limited to rooms with outside exposure
|
PTACs (package terminal air conditioners)
|
|
|
these do not need access to the outside air for condensing
|
water source heat pumps
|
|
|
can air conditioners be used as heaters in warmer climates (down south) by reversing the process
|
yes
|
|
|
DX
|
direct expansion
|
|
|
this removes heat by compressing air and atoms
|
air conditioner
|
|
|
this type of system is when a refridgerant is used in the coil
|
DX
|
|
|
this type of system is when the compressor is included with the equipment
|
unitary system
|
|
|
limitation of a DX system
|
the system must be in close proximity with the outdoors.
|
|
|
what is a more economical choice for pipes in summer (gas or electric)
|
gas
|
