Evaporator coils play a vital role in your HVAC system,
particularly, the heat pump or air conditioner. Today, we’ll look at the
different types of evaporator coils you can install for your HVAC system and
the key roles they play.
What are the main components of an Evaporator coil?
Although there are several different evaporator coil types
for air conditioners and heat pumps, they all have the same basic components
which are instrumental in their functionality. These parts are:
Fins: To ensure maximum temperature and energy transfer, all evaporator
coils feature a radiator fin design. And so, regardless of the mode of
operation, the coil can effectively transfer heat energy.
All evaporator contains some sort of copper or aluminum tubing welds into the
coil fin assembly. Here, the tubing is responsible for carrying refrigerant
between the indoor and outdoor coils thereby allowing heat and energy transfer.
This is the main cooling component that circulates the system and particularly
within the coils. The coils absorb indoor or outdoor heat depending on which
mode the HVAC system is currently operating. Some evaporator coils and HVAC
systems only work with specific types of refrigerants. However, the best
evaporator coils will always be compatible with the most eco-friendly and
energy-efficient refrigerant available in the market.
The slanted design allows the condensate to drain off into a pan and cleanly be
disposed of. This way, you don’t have to worry about stagnant water collecting
around your evaporator coil and leading to mold and bacterial growth. Due to
the damp and cold environment here, it’s very easy for mold and bacteria to
make their home here reproduce and quickly take over.
The capacity of your HVAC system dictates the size of your evaporator coils.
Generally, 5 Ton coils are much larger and match according to the outdoor
Manufacturers will often integrate some special features
into their variation of the evaporator coil. However, these are the essentials
you will see across the spectrum when buying an evaporator coil for your home’s
HVAC system. Therefore, to get the best evaporator coil for your home, consult
your local AC maintenance & repair specialist and have them figure out the
best tonnage and capacity for your home.
What Are The Types of HVAC System Evaporator Coils?
The shape of the coil is an important design decision that
dictates how efficient and effective the coil is in dispersing and retaining
heat, depending on the mode of operation.
The different coil shapes include:
Z-Coils & N-Coils
Some of these types are standard across all evaporator
coils. In other cases, only the best HVAC companies such as Trane, Goodman, or
Carrier use them.
The A-Coil design is the most popular among original
manufacturers and other brands. You’ll find these coil designs in Carrier,
Trane and Goodman branded coils.
The A-Coil mimics the letter ‘A’ in its design and has two
slanted edges that take the condensate and drip it down to the pan below.
How the A-coil Works
The A-Coil collects heat when in air conditioning mode. And
so, as the refrigerant circulates through the tubing, the coil becomes frigid
and cools the surrounding air. All the condensate flows down the panels and
drip into the pan below. Here, the pan has a hole which connects to an external
tube and allows the condensate to drain away. This prevents the water from
accumulating and stagnating.
N-Coil and Z-Coil
The N-coil and Z-coil are the same design, and the only
difference between them is in their positioning. The two variations align in a
vertical position or horizontal position. Apart from this subtle difference,
there are no structural or performance differences between the two coils. And
so, often, they are collectively known as zigzag coils. Although not as popular
as the A-coil, the zigzag coil is also widely found in the evaporator coil
The zigzag coil differs from the A-coil in one primary aspect
– it has a third leg of radiator-type fins. Although the zigzag coil functions
almost the same as an A-coil, the extra surface area for heat transfer means
that the N-coil or Z-coil is better at collecting or dispersing heat. Moreover,
the zigzag coil is compact as well. However, this design does make it harder to
clean and maintain. Moreover, they freeze up quite often, making maintenance a
Evaporator coils are an important part of your HVAC system.
Therefore, choosing the right one with the right capacity and type is essential
if you want to save money and spend less energy heating and cooling your home.
See the summary of this content here – Components
of HVAC System Evaporator Coils [Infographic]
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