The multi-spring was first developed by Japanese companies, the first being Daikin and Mitsubishi Electric, which were put on the market in 1982 and 1983 respectively. Daikin entered the Chinese market relatively early. It was the only one at the time, and its prices and profits were so high that dealers were delighted. Now Daikin has an absolute advantage in the market.
Mitsubishi Electric focuses on brand positioning - high-end products, and the same technology is also one of the best. For example, as the length of the piping increases, the refrigerant pressure decreases due to loss, and gas-liquid two-phase problems will occur at the end. Jin requires the use of professional branch pipes provided by them, and the installation non-levelness is required to be less than 15, while Mitsubishi Electric does not require it. The tee purchased from the market will do, and there is no levelness requirement.
If there are multiple connections, the main aspects are: 1. Compressor, 2. Refrigerant control technology, 3. Frequency conversion method, 4. Internal machine noise,
1. Daikin DC variable speed high-pressure shell scroll Compressor, single unit maximum 8HP; Mitsubishi Electric DC variable speed low-pressure housing compressor, single unit maximum 18HP; 95°C environment will reduce motor efficiency and life; low-voltage housing motors work in an environment of 27°C, efficiency and lifespan relatively high.
2 As mentioned above, the refrigerant components that make up r410a change when there are two phases of gas and liquid, resulting in abnormal operation of the internal unit. At the same time, if household billing is performed, the error will be too large due to inaccurate flow measurement.
3 Daikin has step frequency conversion, which has a large beating amplitude. Mitsubishi Electric linear frequency conversion is stepless. The digital variable refrigerant output depends on compression and idling within a cycle (about 20 seconds).
4 Internal machine noise can only rely on user feedback, because the data on many manufacturers’ samples is false.
In addition, I said above that the energy efficiency ratio (COP) is not comparable, because according to the current standards, the energy efficiency measured by connecting pipe lengths within 10 meters and 100 load operations is different from the actual operation of the project. The data deviation is too large. For example, there is no attenuation within 10 meters, but if it is connected to 100 meters, the attenuation situation of each manufacturer is quite different. Toshiba multi-split machine has a larger attenuation due to the use of a dual-rotor compressor. The digital machine has idling when it is partially loaded, and the idling consumption is not reflected in the COP.
Mitsubishi's development policy:
Strive to reduce the occurrence of failures
Daikin's development policy:
Improve response after failure Capability
Mitsubishi Electric's central air conditioner is a fully variable frequency machine, with a single module up to 18HP, and only one outdoor unit and one fully variable frequency compressor. Both Mitsubishi Electric and Daikin still have fully imported machines, but Daikin's fully imported machines have relatively few domestic users.
The reasons why Mitsubishi Electric is better than Daikin are as follows:
1. Mitsubishi compressors, inverter boards and important accessories are all imported from Japan, and are used on Daikin air conditioners. No imported parts can be found, and the core compressor is also produced in Suzhou, China
2. Mitsubishi compressors are technically superior to Daikin. Mitsubishi compressors use low-pressure casings, and the compressors are working It is in a low pressure and low temperature state (about 20 degrees), while Daikin and others use high-pressure gun compressors, which are in a high-temperature and high-pressure state, which shortens the service life (about 100 degrees)
3. Mitsubishi Electric is compressing There is an independent oil pump at the bottom of the machine to lubricate the compressor and extend its life. Daikin does not have an independent oil pump. Instead, it uses pressure difference to press up the lubricating oil at the bottom to lubricate the motor. There is not so much pressure when the machine first starts running. Otherwise, the oil cannot be supplied in time or in winter, the oil is in a solidified state and there is no way to supply oil in time. Long-term machine friction will shorten the life of the compressor
4. Mitsubishi Electric has a patented HIC circuit technology , secondary subcooling is used to completely convert the gaseous refrigerant into liquid refrigerant to maximize the refrigeration effect. Therefore, Mitsubishi can directly use copper tees to connect copper pipes, while Daikin and any other brands do not need HIC circuits. Use branch pipes to connect copper pipes (it is a gas-liquid storage refrigerant, and gas refrigerants cannot be used for air conditioning and refrigeration)
5. In our coastal areas, the air has high salt content In some places, Daikin's information clearly states in writing: The air conditioner cannot be used at the seaside where the air contains high salt content, that is, it does not have anti-corrosion properties, while Mitsubishi Electric does.
6. This is also a key point. Both Mitsubishi Electric and Daikin use DC frequency conversion technology, and Mitsubishi uses stepless frequency conversion, which is a real frequency conversion to save energy, while Daikin uses stepless frequency conversion