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2002
JSRAE
TECHNOLOGY AWARD
2002
JSRAE
TECHNOLOGY AWARD
Japan Society of
Refrigerating and Air
Conditioning Engineers
DC compressor motor (rotor)
Neodymium magnets
The reluctance DC motor has a rotor equipped with
powerful neodymium magnets. The magnetic torque
produced by the neodymium magnets and reluctance
torque results in more efficient operation.
Our unique motor, known as “Poki-Poki
Motor“ in Japan, employs joint lap
production technique. Originally
developed by Mitsubishi Electric, this
motor offers high density and high
magnetic force leading to high efficiency
and high reliability.
Magnetic torque
+
Reluctance torque
LEV1
Power
receiver
Heat
exchanger
Heat
exchanger
Compressor
LEV2
Mitsubishi Electric has developed a power receiver and
twin LEVs
(
linear expansion valves
)
that optimise the
performance of the compressor. By ensuring optimum
control in response to the operating waveform and
outdoor temperature, this technology is tailored to the
characteristics of the new refrigerant to enhance
operating efficiency.
This intelligent temperature control feature — that adjusts
airflow interval to the body depending on air outlet
temperature — allows set temperatures to be raised by 2
degrees without any loss in comfort for a 20% gain in
energy efficiency.
Power Receiver and Twin LEV Control
Joint Lap DC Motor
“Econo Cool” Energy-Saving Feature
Conventional Econo Cool
Ambient temperature 35°C35°C
Set temperature 25°C27°C
temperature 30°C 29.3°C
“Econo Cool” mode
Ensures more comfort even when the set temperature is 2°C higher
than the conventional cooling mode.
“Econo Cool” On Conventional cooling mode
Thrust gas power: minimum
Cradle scrollFrame
Secondary back-pressure chamber
minimizes thrust friction loss.
Primary back-pressure chamber
minimizes leakage loss.
Thrust friction loss: minimum
Leakage loss: minimum
Fixed scroll
The highly efficient scroll com-
pressor is equipped with a “Frame
Compliance Mechanism” that
allows movement in the axial
direction of the frame supporting
the cradle scroll. This greatly
reduces both leakage and friction
loss, ensuring very high efficiency
throughout the speed range.
Highly Efficient DC Scroll Compressor
Frame movable
in the direction
of the axis.
Remarkable
reduction
in leakage and
friction loss
Without PAM Control With PAM Control
Supply
voltage
Current
Time Time
PAM adjusts the form of the current wave so that it becomes close to that of the supply
voltage wave. High harmonics are reduced and 98% of the electricity is utilized.
Using a Motorcycle as an example
PAM
Energy savings is limited.
Fuel is wasted.
Significant energy savings.
Electricity loss reduced for
surprising energy savings.
Power is limited.
Power is insufficient
for steep hills.
Power increased.
Efficient increase
of voltage for increased power.
Conventional
Inverter
This diagram illustrates the merits of PAM Control.
PAM (Pulse Amplitude Modulation)
Electricity can be used efficiently with less loss, if the
current wave resembles the supply voltage wave. PAM is
a method for controlling the form of the current wave so
that it conforms to the supply voltage wave. With PAM
control, 98% of input power supply can be effectively used.
Magnetic Flux Vector Sine Wave Drive
By converting the motor’s electrical current waveform
from the conventional waveform to a sine wave (180° con-
ductance), this microprocessor raises the motor winding
utilization ratio and reduces energy loss for higher
efficiency.
A high-efficiency DC motor drives the fan of the
outdoor unit. It offers up to 60% greater efficiency than an
equivalent AC motor.
DC Fan Motor
70%
80%
90%
100%
Efficiency
024681012 14 16
Number of Years in Use
Flat Fin Efficiency
Conventional Fin Efficiency
*The initial period is set at 100%.
Energy Efficiency Stays Strong
( 3 times stronger than conventional Fins )
Highly Reliable Flat Fin
Thanks to the flat fin preventing clogging, the initial high
energy efficiency is maintained throughout the unit's
long lifespan.
* Available only during manual cooling operation.
Inverter & Energy Saving Technology
( PUHZ Series )
( PUHZ Series , M Series )
( M Series )
Reluctance DC Rotary Compressor
( PUHZ Series )
( PUHZ Series )
distribution
(
°C)
14 16 18 20 22 24 26 28
Perceived
Temperature
Sine-wave drive soft PWM
This produces the most efficient waveform in response to
varying compressor motor frequency. By improving
operating efficiency from low to high speeds, annual
electricity costs are reduced.
Vector-Wave Eco Inverter
The inverter has been made compact
by insert-moulding the circuit pattern
in synthetic resin. To ensure quiet
operation, soft
PWM control is used to
prevent the metallic whine associated
with conventional inverters.
Smooth wave pattern
*These classifications are for Split and Multi-Split type air conditioners.
Energy Labeling of Air Conditioners
Outdoor unit
Indoor unit
More efficient
Less efficient
Annual energy consumption,
kWh in cooling mode
(Actual consumption will depend
on how the appliance is used
and climate.)
Energy efficiency ratio
Full load (the higher the better)
Type Cooling only –
Cooling + Heating –
Air cooled –
Water-cooled –
Heat output kW
Heating performance
A: higher G: lower
Noise
(dB(A) re 1 pW)
Further information is contained
in product brochures.
All air conditioners with the cooling capacity under 12kW are concerned.
Directive defines for each type of product the energy class going from A (more efficient) to G (less efficient).
The energy efficiency class is determined in accordance with the following tables.
Norm EN 814
Air conditioner
Energy Label Directive 2002/31/EC
Classifications
Energy Efficiency Class
In cooling mode
A 3.20 < EER
B 3.20 ≥ EER > 3.00
C 3.00 ≥ EER > 2.80
D 2.80 ≥ EER > 2.60
E 2.60 ≥ EER > 2.40
F 2.40 ≥ EER > 2.20
G 2.20 ≥ EER
Energy Efficiency Class
In heating mode
A 3.60 < COP
B 3.60 ≥ COP > 3.40
C 3.40 ≥ COP > 3.20
D 3.20 ≥ COP > 2.80
E 2.80 ≥ COP > 2.60
F 2.60 ≥ COP > 2.40
G 2.40 ≥ COP
Product
Air Conditioners
A B C 1 2 3
A B C 1 2 3
A
X.Y
X.Y
X.Y
X.Y
A B C D E F G
Model Name
Energy Efficiency Class
Annual Energy Consumption
The Annual Energy Consumption is
calculated with the total input power
multiplied by an average of 500 hours
per year in cooling mode at full load.
Energy Efficiency Ratio
Higher EER means better
energy efficiency.
Type of Air Conditioner
A
B
C
D
E
G
Energy
AIR CONDITIONING SYSTEMS
Manufacturer
F
Cooling output kW
7
8