The multi-cooling system has a decentralized control structure. Practice and simulation show that the temperature controllers located in the cold rooms tend to synchronize, which decreases the storage quality and reduces lifetime of the compressors. The paper takes the supermarket refrigeration system, a typical multi-cooling system, as example, and investigates the temperature synchronous phenomenon. The thermal load of the surrounding air in the display cases are proposed as an important factor, which dramatically influences behaviors of the system. By adopting different thermal loads through adjusting air speeds of the air curtains, the system operates in the de-synchronization situation and achieves better performances. All simulations are based on a simulation model of the supermarket refrigeration system in Matlab/Simulink. Ideas and results in the paper are not limited into the supermarket refrigeration system and can be extended to other multi-cooling systems.
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