Why Air-con Not Cold Anymore?
Aircon suddenly not cold anymore?
In a hot and humid country like Singapore, an
air-conditioner is quickly becoming a staple in
households, offices and shopping centre. Almost
every household in Singapore has an
air-conditioner. The air conditioner is a device
designed to dehumidify and extract heat from the
area through a refrigeration cycle. This results
in the area being cool.
A regular air conditioner consists of a few
major components which are the evaporating unit,
condensing unit, expansion valve and compressor,
and other components such as a thermostat and an
onboard filter.
How does an air conditioner work? Basically, it
uses all the major components as mentioned
earlier to exploit a basic physics principal
called "phase conversion" and putting a
refrigerant (usually a chemical compound)
through the refrigeration cycle.
Firstly, the low pressure evaporating unit,
which is placed inside the area you want to keep
cool, absorbs heat from the area. The
refrigerant inside it absorbs the heat, changing
it from a liquid state to a gaseous state. To
reuse the refrigerant, it has to be converted
back to liquid state to repeat the process.
Thus, the gaseous refrigerant has to go through
the compressor, putting it under high pressure
and undergoes an exothermic reaction. The excess
unwanted heat is expelled outdoors through the
condensing unit and the refrigerant changes
state once again from gas to liquid. The process
is then repeated to continually keep the room
cool. The expansion valve is placed in between
the evaporating and condensing unit to regulate
the refrigerant flow into the evaporating unit.
However, at times, it may seem like the air
conditioner is not functioning well. It is no
longer cooling the area.
Why is this so? This can be attributed to
a few of reasons.
The first
reason
is due to the air conditioner being old.
An average lifespan of an air conditioner is
about 15 years and it requires regular
preventive maintenance to prolong its lifespan
and allowing it to perform efficiently. If your
air conditioner is over 15 years, it is probably
high time to get a replacement.
The second reason
is dirty air conditioning
components, which results in reduced efficiency
of the air conditioner. Things such as a clogged
air filter or fan motor clogged with dust (which
prevents cool air from being released) creates
inefficiency within the air conditioning system
and may result in less than ideal cooling of the
room. Even worst, they may overwork the air
conditioner and thus shortening the lifespan of
it. As stated above, it is always good to
regularly clean the air conditioner and undergo
maintenance to keep it in tip top condition so
as to maximize efficiency.
A third reason
could be due to faulty parts in
the air conditioner. The last reason could be
due to a mismatch in adjustment of the air
conditioner to the surroundings. Utilize the
settings to switch to a cool temperature
suitable to the user. If this still fails, a
possibility is that the installed air
conditioner is undersized and not suitable for
the room.
It is necessary to customize and find a suitable
air conditioner to fit the surrounding and it
may take some time to look for the right one.
However, it is worth the trouble as it will keep
you cool and save you money in the long run in
terms of cost efficiency.
Also Read:
Why My Aircon Got Water Leaking Problem
How Long Should We Service Our Aircon Again?

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