Mitsubishi Heavy Industries Technical Review Vol. 56 No. 4 (December 2019)1"Hyper Inverter" Compact and Lightweight Packaged
Air Conditioner

M i ts u b i s h i H e a v y I n d u s t r i e s T h e r m a l
S ystems, Ltd.

Recently, the reduction of carbon dioxide emissions has been required to prevent global
warming, and in the case of packaged air conditioners, it is necessary to convert to a refrigerantwith a low global warming coefficient and improve efficiency to reduce power consumption. On
the other hand, there is strong request for downsizing and weight reduction of the outdoor unit due
to restrictions of installation locations and ease of transportation and carry-in, which must bebalanced with improvements in efficiency.
Mitsubishi Heavy Industries Thermal Systems, Ltd. has developed the Hyper Inverter seriesof packaged air conditioners, which are compact, lightweight and highly efficient. This paper
introduces the characteristics and specifications of the outdoor units.

|1. Product characteristics
1.1

Improved transportation and carry-in characteristics through downsizing andweight reduction

Figure 1 shows a comparison of the unit height and weight with those of the conventional
unit. The height of the newly-developed unit has been reduced from 1300 mm to 1050 mm and theunit weight has been reduced from 98 kg to 86 kg. In addition, by arranging transportation handles
near the four corners as shown in Figure 2, we have realized the improvement of transportation andcarry-in characteristics, including the ability to load the units into small vans and carry them up anddown stairs. Serviceability improvements, such as the addition of a rain protection cover, were also
realized to meet market requests.

Figure 1Comparison of unit height and weight with conventional unit

Mitsubishi Heavy Industries Technical Review 56 No. 4 (December 2019)
2Figure 2

1.2

Handle layout of outdoor unit

High performance and efficiency

Refrigerant R 32 and a new outdoor fan were adopted in order to clear the APF (AnnualPerformance Factor) standard value regulated by the Revised Energy Conservation Act, and the
APF standard value was achieved by the combinable indoor unit*1.
*1: FDFV 1605 HA5S is excluded(1)

Adoption of R32 refrigerant
To prevent global warming, the Kigali Amendment to the Montreal Protocol required
reductions in the use of HFCs (Hydro Fluorocarbon, a substitute CFC). For this reason, R32
refrigerant, in which the GWP (Global Warming Potential) is about 1/3 of that of the R410A
used in conventional air conditioners, was adopted. By downsizing the outdoor unit, the amountof charged refrigerant can be reduced by about 13% compared with conventional units, thereby
contributing to the control of global warming.
In addition, by improving the refrigeration performance by changing the refrigerant, thepower consumption required to achieve the same performance as the conventional model wasreduced. This effort also contributed to improving efficiency.
(2) Adoption of new outdoor fans
In the conventional unit, two outdoor fans were used to send air to the heat exchanger toexchange heat with the outside air. However, in the newly-developed unit, in order to reduce
the unit height, it was necessary to reduce the number of outdoor fans from two to one.
Therefore, a large-diameter fan was adopted for the outdoor fan, and the fan diameter wasincreased by 8% compared with the conventional fan illustrated in Figure 3. For theimprovement of fan efficiency, we optimized the fan shape using computational fluid dynamics
and equalized the flow of air through the fan. As a result, the power consumption of the outdoor
fan at the same air volume was reduced by about 12% compared with the conventional fan,contributing to the improvement of APF.

Figure 3

Comparison of new and old fan shapes

Mitsubishi Heavy Industries Technical Review 56 No. 4 (December 2019)3|2. Product Specifications
Table 1 lists the specifications of the “Hyper Inverter Series.”
Table 1Specifications of “Hyper Inverter Series”

Model
Cooling capacity (kW)Heating capacity (kW)APF2015
APF2006
HeightDimensions (mm)WidthDepth
Weight (kg)RefrigerantSound Power Level (dB (A))

FDCVP1125HA
10.0
11.2
6.3
6.2

72

FDCVP1405HA
12.5
14.0
6.0
5.7
1050
970
370
86R32, 3.3kg
72

FDCVP1605HA
14.0
16.0
5.8
5.5

73

|3. Conclusion
A compact, lightweight and highly-efficient packaged air conditioner was developed andlaunched in September 2018, taking into account various customer requests such as improvements
in installation and serviceability and additional functions. We will continue to develop and provide
packaged air conditioners while meeting market needs and customer requirements.