Method for centrifugal chiller

In the use of negative pressure working mediumcentrifugal chillerIn the group system, due to the physical characteristics of the negative pressure working medium, the evaporator is in a negative pressure state when the unit is running, and the outside air will leak into the evaporator, causing the air to be mixed into the refrigerant, resulting in a decrease in the performance of the unit, and the air entering the system is compressed by the compressor And enter the condenser. In the condenser, the gaseous refrigerant exchanges heat with the cooling water and condenses into liquid refrigerant, while the air mixed into the system cannot be condensed under the pressure of the condenser and the water temperature of the cooling water, and becomes non-condensable gas. With the long-term operation of the unit, non-condensable gas will gradually accumulate in the upper part of the condenser, seriously affecting the performance of the unit. In order to solve the above technical problems, a centrifugal chiller capable of separating a non-condensable gas into a refrigerant and a control method thereof are provided. A centrifugal water chiller includes a condenser, an evaporator, a compressor, a cleaning tank and a cooling system. The cleaning tank is provided with a gas inlet, a gas outlet and a liquid working medium outlet. The cooling system is a cooling coil, the cooling coil is arranged in the cleaning tank, and the two ends of the cooling coil pass through the side wall of the cleaning tank and communicate with the cooling medium supply device. One end of the cooling coil is in communication with the refrigerant liquid outlet of the condenser and the other end is in communication with the inlet of the evaporator. One end of the cooling coil communicating with the liquid outlet of the condenser is provided with a valve body, and the other end is provided with three valve bodies. One end of the cooling coil is in communication with the cooling water inlet of the condenser, and the other end is in communication with the cooling water outlet of the condenser. The gas outlet communicates with the outside through the fourth valve body, and one end of the cooling coil communicating with the cooling water inlet is provided with a valve body, and the other end is provided with three valve bodies. The cooling system of the centrifugal water chiller is an air cooling system, two ends of the air cooling system pass through the side wall of the cleaning tank, and one end of the air cooling system is communicated with the cold air supply device. The gas inlet is provided with a fifth valve body, and the liquid working medium outlet is provided with a second valve body. The liquid working medium outlet is below the level of liquid refrigerant in the cleaning tank. According to the control method of the centrifugal chiller of the present invention, the refrigeration capacity of the centrifugal chiller is read, and the leakage rate is detected through experiments; the first valve body, the second valve body, the third valve body and the fifth valve body are connected, and the first time period of the four valve bodies is disconnected, so that the centrifugal chiller performs the refrigeration mode, and the mixed gas of gaseous refrigerant and non-condensable gas is sent into the cleaning tank, and the one valve body and the three valve body are connected for a period of time, so that the refrigerant cools the mixed gas in the cleaning tank; the one valve body and the three valve bodies are disconnected, and the four valve bodies are connected for a period of time, so that the uncooled non-condensable gas in the cleaning tank is discharged.

Provided by the present inventioncentrifugal chillerGroup and its control method, set up a cleaning tank, and send the mixed gas mixed with gaseous refrigerant and non-condensable gas into the cleaning tank for cooling. After the non-condensable gas is separated, the cooled refrigerant is sent into the system through the cooperation of one valve body, two valve bodies, three valve bodies, four valve bodies and five valve bodies, and the separated non-condensable gas is discharged into the chiller to achieve the purpose of cleaning the non-condensable gas.