Figure 1: The commercial air conditioning system on the rooftop.
Because of the acceleration of urbanization, commercial air conditioners have developed rapidly in recent years. The rise of large commercial office buildings, hotels, shopping malls gives commercial central air conditioners a great market space.
Compared with residential central air conditioners, commercial central air conditioners are more powerful, and their compressor, control system and control pipeline are much more complex, which is a test of the technical strength of manufacturers.
A central air conditioning system is a supporting facility of a modern office. To meet the requirements of application scenarios, there are demands on the operating efficiency, temperature control, and product functions. Mitsubishi Heavy Industries - Haier and Toshiba, as enterprises with strong technical backgrounds, compete in the field of commercial air conditioners. So which one is better?
Mitsubishi Heavy Industries - Haier inherits more than 150 years of technology accumulated by Mitsubishi Heavy Industries. The commercial central air conditioner is equipped with a varied-frequency 3D scroll compressor which has won the “Japan Society of Refrigeration and Air Conditioning Engineers Academic Award”.
Compared with ordinary compressors, 3D scroll compressors have the advantages of durability, high efficiency and miniaturization. And through the combination of DC vector frequency conversion control technology and compact high efficiency heat exchanger technology, it achieves energy saving and low noise operation, higher IPLV (c) value of 10.0, which is far beyond the national level of energy efficiency. Besides, air conditioners are given excellent energy saving and environmental protection attributes, and a more comfortable and healthy experience.
The 3D compressor achieves a higher compression ratio and efficiency by combining upper and lower compression with horizontal two-dimensional compression, compared to a normal compressor that can only run horizontally. The 3D compressor greatly improves the energy efficiency of the system, which is of transformational significance to the industry.
Toshiba focuses on rotor compressor technology. The twin rotary compressor is more efficient at a low speed. However, there is an upper limit on the capacity of a single unit, so it is in a disadvantageous position in the field of commercial air conditioners of large units.
Figure 2: The central air conditioner is used in the building.
Toshiba still utilizes the DC variable speed twin-rotary compressor, and the compressor can work efficiently for home use, which can realize the speed control precision of 0.1 Hz. But twin-rotary compressor capacity limits, and it is difficult to realize large displacement. The large air conditioning system using a horse number of slant generally requires high frequency operation.
Therefore, Mitsubishi Heavy Industries - Haier 3D scroll compressor is more easily applied in the field of commercial central air conditioners. At the same time, this technology has won national patent recognition, which is more recognized in terms of quality and energy efficiency.
The Heat Core technology is derived from the space field of Mitsubishi Heavy Industries. It is a comprehensive application of four technologies including gas-liquid enthalpy increasing technology, HPPC thermal transfer technology, HRC control technology and valving-bridge phase transition technology.
This Heat Core technology greatly improves the heating capacity of the system by optimizing the pipeline in the phase change area, collecting and adjusting the exhaust temperature in real time and increasing the compensation circuit. And it realizes the non-attenuation heating at -20℃, refreshing the new height of cold and heat technology.
Many Mitsubishi Heavy Industries - Haier commercial air conditioners use Heat Core technology. In particular, the newly listed TXZ intelligent air conditioner in 2020 is developed and designed by Japanese designers. It uses the compressor with jet-enhancing enthalpy technology to effectively improve refrigerant circulation.
The low temperature heating performance of the air conditioner has been improved by 50%, and it can realize ultra-low temperature heating at -30℃ and ultra-high temperature refrigeration at 55℃, realizing the industry's first operation in the ultra-wide temperature zone of 85℃.
The overwhelming advantage of the Heat Core technology deeply shows the concept of "cooling is the duty and heating is the king", enabling Mitsubishi Heavy Industries - Haier commercial air conditioners to meet the user needs of the heating areas and to highlight the competitiveness compared with Toshiba and other competitive brands.
Figure 3: The outdoor unit of the Toshiba central air conditioner.
The modern building structure and decoration style make the indoor unit which occupies less space and saves the space cost become the hot spot. Mitsubishi Heavy Industries - Haier adheres to the concept of compact design.
By optimizing the vortex shell structure, its V-duct machine creates a compact fuselage with a thickness of 198mm and a depth of 439mm, which is 12% smaller than that of traditional central air conditioners. And through the refrigerant tube design, electric control box built-in design, it further improves the installation convenience.
By comparison, Toshiba develops little in the function of central air conditioners. Its internal unit thickness reaches 210mm and the depth reaches 645mm. Installation scenes are relatively limited, which affects the improvement of user experience to some extent.
Compared with brands such as Toshiba, Mitsubishi Heavy Industries - Haier has set up a clear banner in service construction and won a good reputation among users as well. Commercial air conditioners are measured by good products and good service.
In addition, Mitsubishi Heavy Industries - Haier central air conditioners are equipped with core technologies of Mitsubishi Heavy Industries, which endow products with stronger market competitiveness. In the field of commercial air conditioners, it has also been widely recognized by the market and consumers.