Ch. 27 quiz
Air has weight, volume, and
all of the above. temperature, specific heat, heat conductivity
An anemometer using incoming air to deflect a vane at different angles to calculate velocity is a
Swinging Vane Anemometer
Most people are comfortable in an atmosphere with the relative humidity between temperature between 70°F (21°C) and 85°F (29°C). and the
30% and 70%
the In the summertime, air-conditioned buildings are usually kept at temperatures approximately outside temperature.
10°F (5.6°C) to 15°F (8.4°C) below
makes up 0.03% to 0.04% of the atmosphere and is absorbed by growing plants.
Carbon dioxide
How warm the combination of humidity and temperature feels to an occupant of a space is temperature
Equivalent Temperature
What forecast term on the Beaufort scale is used to describe wind effects of breaking twigs off trees and generally impeding progress?
Gale
A Pitot tube and manometer used for ductwork airflow in HVAC most often measure values in
Inches of water column
The conditions in the atmosphere refer to
Weather
Changing the air in a building is done by ventilation, metered in CFM and referred to as
air changes per hour
According to ASHRAE, the process of treating air so as to control simultaneously temperature, humidity, cleanliness, and distribution is called
air conditioning
Make-up air is necessary for fuel-burning appliances because oxygen is necessary for
combustion
The volume of air flowing through a duct is calculated in
cubic feet per minute
of the air. dividing the weight of air by the volume it occupies, you can calculate the
density
Starting at sea level and rising higher in altitude through the troposphere, atmospheric pressure
drops
gas that is very light and present in most fuels is
hydrogen
Desiccants are substances that absorb from the air.
moisture
The amount of moisture in an dir sample compared to the total amount of moisture the same sample would hold if it were completely saturated at the same temperature defines the term
relative humidity
In the warm season, humidity controls are typically set to the conditioned air.
remove humidity from
When radiant heat strikes a surface that is colder than the radiating body,
some of the radiant heat is absorbed into the colder surface