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HVAC 725 1st Year Midterm exam with complete solution 2024_2025.
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HVAC 725 1st Year Midterm exam with complete solution 2024_2025.
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HVAC 725 1st Year Midterm exam withcomplete solution 2024/2025
If the pressure exerted on a refrigerant in the vapor state remains constant but its
temperature above absolute zero is doubled, the volume of the vapor will be?
approximately doubled
______is the variation of air temperature in a building space that occurs when
warm air rises to the ceiling and cold air drops to the floor.
Temperature Stratification
Read MoreAir velocity of ___ fpm in building spaces is considered ideal for
comfort
40
Comfort is typically attained at normal cooling and heating temperatures with a
relative humidity of about ____%
50%
____ is the process of reducing air pollution by introducing enough fresh outdoor
air into a building to dilute indoor polluants.
Ventilation
______ is the condition that occurs when a person can not sense a difference
between themselves and the surronding air.
Comfort
_____ is a device that removes moisture from air by causing the moisture to
condense or be trapped
Dehumidifier
Two terms that are associated with the health effects of buildings are
building-related illness and sick-building syndrome
All building owners should have ______ systems in place to keep HVAC
equipment operating at design conditions
Preventative maintenance
, Higher relative humidity _____ the evaporation rate while lower relative humidity
____ the evaporation rate?
lowers, raises
Indoor air quality guidelines indicate that space temperature should be between
___ degree F and ____ degrees F for comfort cooling in the summer.
72 and 76
Indoor air quality guidelines indicate that space temperature should be between
___ degree F and ____ degrees F for comfort cooling in the winter.
70 and 74
The temperature below which moisture in the air begins to condense is called
Dew Point
List the five factors of human comfort
Temperature, Humidity, Circulation, Ventilation, Filtration
Relative Humidity
is the amount of moisture in air compared to the amount moisture the air would at
the same temperature when the air is saturated or full of moisture.
One Ton of Cooling
The amount of heat needed to melt a ton of ice in 24 hours. 12,000 btu's/hr or
288,000/day
Define Air Filtration
The process of removing particles and contaminants, such as gases and odors,
from air that circulates through air distribution systems.
BTU
The amount of energy needed to heat one pound of water one degree Fahrenheit
between 32 degrees and 212 degrees Fahrenheit at a given pressure.
Make up Air
is air that is used to replace air that is discharged as exhaust.
What is the most common complaint that HVAC technicians get from their
customers?
The building is too hot or too cold
Four Basic components that make up the mechanical compression refrigeration
process?
Compressor, Condenser, Evaporator, Metering Device
At standard conditions on Celsius scale, water will boil at?
100 degrees celsius
Pure water boils at a temperature of 212 degrees fahrenheit at which of the
following psi?
14.697 psia
The temperature on the F scale where all molecular activity stops is?
-460 degree F
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