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Module 8 HVAC Heat Ventilation and Air Conditioning System
hvac
Course
BS Architecture (Arki01)
223 Documents
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University of Northern Philippines
Academic year: 2023/2024
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MODULE 17 – Engineering Utilities 2
HVAC (Heating, Ventilation, and Air Conditioning) Systems,
Introduction.
HVAC refers to the different systems used for
moving air between indoor and outdoor areas,
along with heating and cooling both residential
and commercial buildings. The main purposes of
a Heating, Ventilation and Air-Conditioning
(HVAC) system are to help maintain good
indoor air quality through adequate ventilation
with filtration and provide thermal comfort.
HVAC systems are among the largest energy consumers in schools. HVAC systems
generally control temperature, humidity, and quality of air in a building or any occupied
space. The main goal of the HVAC system is to create and maintain a comfortable
environment for the occupant within a building.
The air is cleaned by removing the smoke, dust or pollens that contaminates the air. The air is
ventilated by maintaining the gas ratio, which can be done by adding external fresh air. Lastly,
the system controls the air movement that is supplied in a space which ensures that those in
the place are comfortable.
BASIC COMPONENTS OF HVAC SYSTEM AND THE ROLE THEY PLAY TO
KEEP THE CONDITION SUITABLE:
Furnace
Is the largest and the main component of the commercial HVAC system. It heals the air that is
supplied the system; this can be done through the heat pump, solar energy, or the burning of
the natural gasses. Inside the furnace, there is the heat exchanger, which helps to switch on
when the furnace is activated. It pulls the cold air and heats and circulates the air through the
vents.
Programmable digital thermostats allow you to regulate the amount of energy you
use throughout the day by scheduling the time you want your HVAC system to
start/end and the temperature you want your house to be. The set time and temperature
will only change when you reset the program.
Smart thermostats are more complex than the other three. They consist of multiple,
convenient features, such as Wi-Fi compatibility, zone control, touch screen and voice
command options, all while conserving the amount of energy you use up in a day.
Evaporator Coil
This helps to cool the heated air. It is connected to
the condensing unit which is filled with refrigerant
gas. The unit is usually installed outside the room. It
pumps the condensed liquid to the evaporator coil
which is evaporated to gain again.
How do you keep the coil clean?
First, remove the access panel. That will
expose the evaporator coil. Make sure you go
over your manual first, though, before you
proceed with anything. The manual should
make it easier for you to find the access panel
and where your evaporator coil is.
Turn off the AC. Don’t take chances. Remove it from the plug. You don’t want it to
accidentally turn on.
Get the access panel off. Just remove the screws or fasteners. However, make sure you
go about this in a tidy and organized way. This means setting the panel and screws or
fasteners aside in one spot. That way, you won’t lose anything. You’ll find it easy and
convenient to secure the panel back when you’re done if you aren’t looking for every
lost screw or missing fastener.
Use a compressed air canister. One of the best ways to get the dirt and other debris out is
to use compressed air. Blow the air into the coil to loosen the dirt. If there’s stubborn
dirt, though, you might need to put the nozzle close to the bottom of the debris, along its
side. You can also go with a 90-degree approach if you’re using high pressure air.
Refrigerant Lines
This unit carries the refrigerant substance to the condensing unit for vaporation and returns it
to the evaporator in liquid form. They are narrow tubes usually resistant to healing and
cooling.
Ductwork
This unit transports the cooled or the
heated air across the room. The duct are
made of lightweight aluminum. The
ductwork is connected with the vent that
transfer cooled or heated air to individual
rooms. They are usually located near the
ceiling and are fronted with angled slats.
This can be manually controlled to
regulate the heating or cooling of space
that they are directed. Heat ducts in a house are usually installed in the floor or the ceiling. But
which one is preferable? Both locations have positives and negatives, depending on a number
of variables.
Vents –
An air return is a vent grille that is usually located either in a hallway or in the ceiling, and
its purpose is to extract air from a room and recycle it through the system to further condition
it by cooling or heating.
There are basically seven main processes required to achieve the full meaning of HVAC
and they are listed and explained below:-
Heating:
It is the process of raising or maintaining the temperature of the space by the process of adding
additional thermal energy (heat) to the conditioned space.
Cooling:
It is the process of lowering or maintaining the temperature of the space by the process of
removing thermal energy (heat) from the conditioned space.
Humidifying
It is the process of lowering or maintaining the moisture content of the air by the process of
adding water vapor ( moisture) to the air in the conditioned space.
Dehumidifying
It is the process of lowering or maintaining the moisture content of the air by the process of
removing water vapor ( moisture) from the air in the conditioned space.
Cleaning
It is the process of improving or maintaining the air quality by removing particulates and
biological contaminants from the air delivered to the conditioned space.
Ventilation
It is the process of improving or maintaining the air quality, composition and freshness by
exchanging air between the outdoors and the conditioned space for the purpose of diluting the
gaseous contaminants present in the air.
Air Movement
It is the process of circulation and mixing of the air through the conditioned spaces in the
building for the purpose of achieving proper thermal energy transfer.
End of Module.... Thank you and stay safe.
Engr. GEORGE P. ALONZO
Professional Electrical Engineer
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Module 8 HVAC Heat Ventilation and Air Conditioning System
Course: BS Architecture (Arki01)
223 Documents
Students shared 223 documents in this course
University: University of Northern Philippines
Was this document helpful?
MODULE 17 – Engineering Utilities 2
HVAC (Heating, Ventilation, and Air Conditioning) Systems,
Introduction.
HVAC refers to the different systems used for
moving air between indoor and outdoor areas,
along with heating and cooling both residential
and commercial buildings. The main purposes of
a Heating, Ventilation and Air-Conditioning
(HVAC) system are to help maintain good
indoor air quality through adequate ventilation
with filtration and provide thermal comfort.
HVAC systems are among the largest energy consumers in schools. HVAC systems
generally control temperature, humidity, and quality of air in a building or any occupied
space. The main goal of the HVAC system is to create and maintain a comfortable
environment for the occupant within a building.
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