What does the chiller measure

Chillers usually have some flow sensors connected to the chilled water and condenser water circuits, and each chiller has its own sensor. If sufficient water flow is detected, the machine is allowed to start.

Then, the chiller also needs to know the inlet and outlet water temperature of the chilled water circuit and the condenser water circuit. Each has flow rate and return water temperature sensors.

Next, the chiller will monitor the pressure of the evaporator and condenser. Then, the chiller also needs to measure the temperature of the refrigerant around the system, so it will measure the temperature of the suction pipe, the temperature of the drain pipe, and the temperature of the liquid water pipe. Based on the temperature and pressure measurements of these refrigerants, the operation can be plotted on a pressure enthalpy diagram.

In this example, we have a centrifugal chiller that uses intravenous catheters to control the capacity of the chiller. These venous catheters change their position to meet the required cooling capacity, and therefore need to measure and control the venous catheter actuator. We can also add this control loop to (Ac).

The induction motor driving the chiller is installed on the back of the compressor and is an important part of the chiller. Obviously, we need to monitor all this. The control panel will also measure the temperature of the coil windings of the induction motor, the amount of current drawn by each phase of the motor, and the voltage. If the voltage count or the temperature becomes too high, the motor may burn out. By monitoring these, the motor can protect itself. It can limit the current and even shut down the motor in the event of a serious fault or preferably before a serious fault occurs.

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