Compared with piston refrigeration compressor, centrifugal refrigeration compressor has the following advantages:
(1) When the refrigerating capacity is the same, the single machine has small volume, less floor area and 5-8 times lighter than the piston type.
(2) Because it does not have the steam valve piston ring and other vulnerable parts, and has no crank connecting rod mechanism, it has the advantages of reliable operation, stable operation, low noise, simple operation and low maintenance cost.
(3) There is no friction between the working wheel and the housing, and there is no need for lubrication. Therefore, the refrigerant vapor does not contact with the lubricating oil, thus improving the heat transfer performance of the evaporator and condenser.
(4) The cooling capacity can be adjusted economically and conveniently with a wide range of adjustment.
(5) The adaptability of a certain structure of centrifugal refrigeration compressor can only adapt to one refrigerant.
(6) It is suitable to use refrigerants with high molecular weight, so it is only suitable for large refrigerating capacity, generally above 250000 kcal / h. If the cooling capacity is too small, the flow rate is small and the flow channel is narrow, so that the flow resistance is large and the efficiency is low. However, after continuous improvement in recent years, the refrigeration capacity of centrifugal refrigeration compressor used in air conditioning can be as small as 100000 kcal / h.
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