● Chilled water circulation system
This part is composed of a refrigeration pump, an indoor fan and a chilled water pipe. The low-temperature chilled water flowing from the main evaporator is pressurized by the refrigeration pump and sent into the chilled water pipe (effluent), enters the room for heat exchange, takes away the heat in the room, and finally returns to the main evaporator (return water). Indoor fans are used to blow air through chilled water pipes, reduce air temperature, and accelerate indoor heat exchange.
● Cooling water circulation part
This part is composed of a cooling pump, a cooling water pipeline, a cooling water tower and a condenser. While the chilled water circulation system carries out indoor heat exchange, it will inevitably take away a large amount of heat energy in the room. This heat energy is transferred to the cooling water through the refrigerant in the main engine, which increases the temperature of the cooling water. The cooling pump presses the heated cooling water into the cooling water tower (effluent) to exchange heat with the atmosphere, and then sends it back to the main condenser (return water) after the temperature is lowered.
● The refrigeration cycle part of the main engine
The main engine part is composed of compressor, evaporator, condenser and refrigerant (refrigerant), etc., and its working cycle process is as follows: first, the low-pressure gaseous refrigerant is pressurized by the compressor into the condenser and gradually condensed into a high-pressure liquid. During the condensation process, the refrigerant releases a large amount of heat energy, which is absorbed by the cooling water in the condenser and sent to the outdoor cooling tower, and finally released into the atmosphere.
Subsequently, when the high-pressure liquid refrigerant in the condenser flows through the throttling and depressurization device in front of the evaporator, it is vaporized due to a sudden change in pressure, forming a gas-liquid mixture into the evaporator. The refrigerant is constantly vaporized in the evaporator while absorbing heat from the chilled water to bring it to a lower temperature. Finally, the vaporized refrigerant in the evaporator becomes a low-pressure gas, which re-enters the compressor, and so on.
● Expansion tank
The expansion tank is an important component of the hot water heating system and the central air conditioning waterway system, and its role is to contain and compensate for the expansion and contraction of water in the system. Generally, the expansion tank is located at the highest point of the system, which is usually connected to the return main pipe near the suction port of the circulating water pump (central air conditioning chilled water circulating water pump).
The expansion tank is a steel plate welded container that comes in a variety of sizes and sizes. The expansion tank is usually connected with the following pipes:
- Expansion Tube: It transfers the volume of water in the system to the expansion tank (connected to the return water).
- Overflow pipe is used to drain excess water in the tank that exceeds the specified water level. Signal tube is used to monitor the water level inside the tank.
- Circulation pipe is used to circulate water in the middle of the bottom of the tank and to the return pipe when there is a possibility of freezing.
- Sewage pipes are used for sewage discharge. The water replenishment valve is connected to the float in the box, and the water level is lower than the set value, and the valve is replenished with water. For safety reasons, no valves are allowed on the expansion pipe and overflow pipe.
● Cooling water pump
A device that drives the circulating flow of water in a cooling water loop. We know that cooling water takes away some of the heat from the refrigerant after entering the chiller, and then flows to the cooling tower to release this heat. The cooling water pump is responsible for driving the cooling water to circulate in the closed loop between the unit and the cooling tower. The shape is the same as that of a chilled water pump.
● Chilled water pump
A device that drives water to circulate in a chilled water loop. We know that the end of the air-conditioned room (such as fan coil unit, air handling unit, etc.) needs the cold water provided by the chiller, but the chilled water will not flow naturally due to the limitation of resistance, which requires the pump to drive the chilled water to circulate to achieve the purpose of heat exchange.