Turbo refrigeration device, its control device and its control method
A refrigeration device and control device technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of reducing refrigerant filling, failure of centrifugal compressor 103, and imbalance of refrigerant flow, etc. , to achieve the effect of reducing the internal volume
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no. 1 approach 〕
[0050] Hereinafter, for the first embodiment of the present invention, use Figure 1 to Figure 4 to explain.
[0051] exist figure 1 , shows a refrigeration cycle diagram of the turbo refrigeration system according to the first embodiment of the present invention, figure 2 as well as image 3 show figure 1 Flowchart showing start-up of a turbo chiller.
[0052] The turbo refrigeration unit 1 has a closed circuit and a control device that sequentially connects a two-stage turbo compressor (centrifugal compressor) 2, a condenser 3, an economizer 4, a main expansion valve (second expansion valve) 5, and an evaporator 7 (not shown).
[0053] The two-stage turbo compressor 2 is a multi-stage centrifugal compressor driven by a reverse motor 9, and is configured to include a first impeller and a second impeller (not shown) in addition to a suction port 2A and a discharge port 2B. The middle suction port 2C between the impellers, the low-pressure gas refrigerant sucked from t...
no. 2 approach 〕
[0097] The turbo chiller, its control device, and its control method of this embodiment differ from the first embodiment in that the temperature of the heat source water is lowered to a predetermined temperature or lower when the turbo chiller is started. Others are the same. Therefore, the same symbols are assigned to the same components and processes, and their descriptions are omitted.
[0098] Hereinafter, for the second embodiment of the present invention, use Figure 5 and Figure 6 to explain.
[0099] Such as Figure 5 As shown, an operation command to start the turbo chiller is given (step 21).
[0100] After the operation command is given in step 21, it is judged whether there is a temperature between the warm water inlet temperature and the warm water outlet temperature of the warm water (first non-refrigerant) measured by the thermometers installed at the inlet and outlet of the warm water circuit of the condenser Poor, whether the warm water outlet temperatur...
no. 3 Embodiment approach 〕
[0119] The turbo chiller, its control device, and control method of this embodiment differ from the first embodiment in that the main expansion valve and the sub-expansion valve are automatically controlled after the turbo chiller is started, and the others are the same. Therefore, the same symbols are assigned to the same structures and flows, and descriptions thereof are omitted.
[0120] Hereinafter, regarding the third embodiment of the present invention, use Figure 7 to Figure 9 to explain.
[0121] After starting up the turbo chiller, it is necessary to prevent the refrigerant from being unbalanced in the turbo chiller and to perform stable operation. Therefore, in the present embodiment, the main expansion valve (expansion valve) and the sub-expansion valve (expansion valve) are controlled according to the state of enthalpy at the outlet of the condenser.
[0122] For processes with automatic control of the secondary expansion valve, use Figure 7 For the flow chart...
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