On September 27th, a team of over a dozen renowned experts, including Academician Jiang Yi from the Chinese Academy of Engineering, Academician He Yaling from the Chinese Academy of Sciences, Luo Jijie from the Air Force Engineering Design Institute, and Li Jiang, president of the Hefei General Mechanical and Electrical Products Testing Institute, gathered in Zhuhai, Guangdong. They unanimously recognized that the "efficient home multi-split system based on large and small volume switching compressor technology" is world-first and has achieved an "international leading" level. Additionally, the "research and application of CAN+ communication technology for multi-split systems" was also rated as "international leading." These two technological breakthroughs have been officially evaluated, marking a major milestone for China in solving the long-standing issue of frequent shutdowns in central air conditioning systems.
Jing Huaqian, deputy secretary-general of the China Refrigeration Society, pointed out that multi-split systems are becoming increasingly popular among households. They are compact and allow one outdoor unit to serve multiple indoor units. However, according to big data analysis, most Chinese households use their air conditioners during nighttime rather than daytime. In fact, a single indoor unit runs for 60% of the total time, while running 1-2 indoor units accounts for 87% of the total operation time. This means that multi-split systems often operate under low load conditions.
The traditional multi-split design is based on the full-house heat load, which results in a large compressor displacement. When only a single 1P indoor unit is operating, the compressor's minimum output is relatively high, making it prone to shutting down at temperature set points. This leads to loss of control and reduced efficiency, similar to fixed-frequency units, with noticeable temperature fluctuations and poor energy performance.
Professor Shi Wenxing from Tsinghua University noted that frequent shutdowns in central air conditioning are a global challenge. To address this, Gree researchers developed an innovative compression system using large and small volume switching technology. The compressor can adjust its mode based on the system’s load. Under low load, only the small volume cylinders operate, while the large ones are unloaded, significantly reducing the minimum output and improving both comfort and energy efficiency. During high load periods, both cylinders work together to meet demand. This flexible design enhances low-load efficiency and reduces the compressor's minimum output.
Moreover, as the number of multi-split systems grows in shopping malls, buildings, and industrial parks, the need for centralized control of hundreds of units is increasing. Traditional master-slave communication networks suffer from slow response times and frequent control failures when managing large numbers of units. This time, China successfully developed the "Research and Application of CAN+ Communication Technology for Multi-Split Systems," which can automatically assign addresses to hundreds of nodes in just a few seconds. It breaks the traditional "minute-level" communication limit, enabling self-organizing networks, easy setup, simple maintenance, and reliable operation.
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