FREQUENTLY ASKED QUESTIONS
Q. how do I choose the system for my
A. Don’t worry RAC can do all that
for you with a no hassle site survey we can tall you exactly what you
how easy are the systems to keep clean
A. They are very easy to keep clean
with easy access filters and wipeable fascias.
you supply portable air conditioning units
A. Yes, RAC can supply
a wide range of portable A/C units for sale or hire.
Do you do air conditioning for cars?
A. We do not undergo work on cars,
but can recommend various companies that do.
Q. Do we need to have extensive
building work to accommodate a system?
A. No, due to the large
choice available we can recommend the right one to fit your situation
and so limit disruption to your existing surroundings, any necessary pipe
work or electrical cables can be kept to a minimum.
Air conditioning includes both the cooling
and heating of air. It also cleans the air and controls the moisture level.
An air conditioner is able to cool a building because it
removes heat from the indoor air and transfers it outdoors. A chemical
refrigerant in the system absorbs the unwanted heat and pumps it through
a system of piping to the outside coil. The fan, located in the outside
unit, blows outside air over the hot coil, transferring heat from the
refrigerant to the outdoor air. Basic Operations. Most
air conditioning systems have five mechanical components: a
compressor :an expansion valve or metering device:an
evaporator coil and blower:a chemical refrigerant.
Most central air conditioning units operate by means of a split
system. That is, they consist of a "hot" side, or the condensing unit—including
the condensing coil, the compressor and the fan—which is situated outside
your home, and a "cold" side that is located inside your home. The cold
side consists of an expansion valve and a cold coil, and it is usually
part of your furnace or some type of air handler. The furnace blows air
through an evaporator coil, which cools the air. Then this cool air is
routed throughout your home by means of a series of air ducts. A window
unit operates on the same principal, the only difference being that both
the hot side and the cold side are located within the same housing unit.
The compressor (which is controlled by the thermostat) is the
"heart" of the system. The compressor acts as the pump, causing the refrigerant
to flow through the system. Its job is to draw in a low-pressure, low-temperature,
refrigerant in a gaseous state and by compressing this gas, raise the
pressure and temperature of the refrigerant. This high-pressure, high-temperature
gas then flows to the condenser coil.
The condenser coil is a series of piping with a fan that draws
outside air across the coil. As the refrigerant passes through the condenser
coil and the cooler outside air passes across the coil, the air absorbs
heat from the refrigerant which causes the refrigerant to condense from
a gas to a liquid state. The high-pressure, high-temperature liquid then
reaches the expansion valve. The expansion valve is the
"brain" of the system. By sensing the temperature of the evaporator, or
cooling coil, it allows liquid to pass through a very small orifice, which
causes the refrigerant to expand to a low-pressure, low-temperature gas.
This "cold" refrigerant flows to the evaporator.
The evaporator coil is a series of piping connected to a furnace
or air handler that blows indoor air across it, causing the coil to absorb
heat from the air. The cooled air is then delivered to the house through
ducting. The refrigerant then flows back to the compressor where the cycle
starts over again.
Perfect comfort all year round - How air-conditioning
works Air-conditioning is an ingenious way of controlling not
only the temperature but also the movement and cleanliness of air inside
the building. Although the process is relatively complex, the operation
itself is quite simple. In most systems each indoor unit
is connected by inconspicuous pipe work to an outdoor unit attached to
a wall, rooftop or balcony, or located in a plant room.
Not just cooling but heating - Lower heating bills
Air-conditioning was originally considered a cooling system. Then with
the introduction of the split heat pump, air-conditioning was able to
provide hot air for winter as well as cool air in the summer, ensuring
optimum conditions all year round.
Good for business - Better productivity Only a few years
ago air-conditioning was considered as a luxury in the UK. Today many
businesses regard it a necessity. In air-conditioned offices, staff work
more productively and managers make better decisions.