Daikin FTKD25DVM [8/22] Tick energy label
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Daikin FTKD25DVM [8/22] Tick energy label

Daikin FTKD25DVM [8/22] Tick energy label
8
RKD25DA RKD35DA
Power
source
Raise frequency
Lower frequency
Low-speed rotation
High-speed rotation
Compressor
Compressor
Inverter Power Control
Non-inverter type air conditioner
High
capacity
Low
capacity
Power
source
Constant speed
rotation
Fixed capacity
50
0 30 60 90 120
60
70
80
90
Rotational speed (rps)
AC motor
Conventional
DC motor
Reluctance DC motor
Motor efficiency (%)
Small load Large load
Low capacity High capacity
More than 20%
The 2.5 to 3.5 kW models have received Singapore’s 4 Tick
Energy Label, which is the highest energy-efficiency rating for
inverter type air conditioners. The energy labeling was
introduced by Singapore’s Ministry for the Environment and
Water Resources. Under the scheme, the inverter air
conditioners with a cooling
capacity of less than 10 kW
must carry labels to indicate
their
energy-saving rating. This
allows
households to select
more energy-efficient models
and so reduce their electricity
4 Tick Energy Label
COP
4.00
3.45
2.90
3.00
2.00
1.00
19%
higher
Conventional
NEW
FTKD25DVMFTKE25BVM
Inverter Advantages Compared to Non-Inverter
PAM Control
What Is DC Inverter?
Daikin calls an inverter model that is equipped with a DC motor DC Inverter. A DC motor offers higher efficiency
than an AC motor. A DC motor uses the power of magnets to attract and repel to generate rotation. A DC motor
that is equipped with high-power neodymium magnets, which enable even greater efficiency, is called a Reluctance
DC motor.
Inverter air conditioners are able to vary their operating capacity. Non-inverter air conditioners can
only operate at a fixed capacity.
Variable Capacity Operation
Energy-Saving Technological Features
Swing Compressor
Reluctance DC Motor for Compressor
Daikin DC Inverter models are
equipped with the Reluctance DC
motor for compressor. The Reluctance
DC motor uses 2 different types of
torque, neodymium magnet*
1
and
reluctance torque*
2
. This motor can
save energy because it generates
more power with a smaller
electric
power than an AC or conventional
DC
motor. It is more efficient at the low
frequencies most commonly used by
air conditioners,*
3
improving efficiency by approximately 20%.
DC Motor for Fan
The DC motor allows fine rotation
control, which reduces energy
consumption. The motor also
provides improvements in
operational efficiency of up to 40%,
compared to an AC motor. These
improvements are particularly
noticeable in the low-speed range.
*1. A neodymium magnet is approximately 10 times stronger than a standard
ferrite magnet.
*2. The torque created by the change in power between the iron and magnet
parts.
*3. The frequency range used by air conditioners during periods of stable
o
peration. This is the range in which air conditioners operate for the
longest periods.
The swing compressor can
reduce operational vibration and
sound because its piston moves
smoothly inside the compressor.
Swing bush
Integral piston of
blade and roller
Refrigerant gas
This was the first scroll
compressor to be equipped
with the Reluctance DC
motor in commercial-use air
conditioners. The Institute of
Electrical Engineers of Japan
presented the award in 1998.
This marked the development
of a high-performance swing
compressor that was
compatible with alternative
fluorocarbons. The prize was
presented in 1997.
Neodymium magnets are used
in the pink-coloured area.
Reluctance DC motor
Swing compressor
Thanks to its smooth
rotation, the swing
compressor decreases
friction and vibration. It
also prevents the leakage
of refrigerant gas during
compression. These
advantages provide quiet
and efficient operation.
PAM (Pulse Amplitude Modulation)
control reduces energy loss by
controlling how often the converter
switches on and off.
Energy Saving
After the indoor temperature
approaches the set temperature,
Inverter Control adjusts to low
capacity operation to maintain this
temperature. This makes inverter
models more energy-saving than
non-inverter models, which must
repeatedly start or stop their
compressors to maintain the room
temperature.
Inverters are devices that are able to vary their operating capacity by adjusting frequency. Inverter air
conditioners can vary their heating/cooling capacity by adjusting the power supply frequency of their
compressors. In contrast, non-inverter air conditioners have a fixed heating/cooling capacity and can
only control the indoor temperature by starting or stopping their compressors.
Comfortable
Inverter air conditioners finely adjust
capacity according to changes in the
a
ir-conditioning load and the difference
between the indoor temperature and
set temperature is small. These give
higher comfort levels than with non-
inverter air conditioners.
Powerful
Inverter air conditioners operate at
maximum capacity as soon as they
start up. As a result, the set
temperature can be reached more
quickly.
Efficiency of Reluctance DC motor
*
4
Too cool
Not cool
During cooling operation
Compressor off
Non-inverter type
Inverter type
Cools a room
in less time
Small temp.
difference
Compressor off
Temp.
Starts
Time
Set
temp.
9
200 300 400 500 600 700 800 900 1000
0
20
40
80
60
100
Efficiency (%)
Motor speed (rpm)
AC motor
Approx.
40%
increase
Approx.
20%
increase
DC motor
*5. Data are based on studies conducted
under controlled conditions at a Daikin
laboratory using Daikin products.
*4. Data are based on studies conducted
under controlled conditions at a Daikin
laboratory using Daikin products.
Efficiency of DC motor for fan *
5
(
comparison with a conventional AC motor
)

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