As a common heat dissipation equipment in industrial production and central air-conditioning system, the cooling tower is affected by factors such as water quality, environment, and working conditions in the long-term operation, and pollutants such as scale and algae are easily produced in the tower, resulting in a decrease in heat exchange efficiency, which in turn affects the operation effect and energy consumption of the entire system. Therefore, it is necessary to regularly clean and maintain the cooling tower, and at the same time, it is also necessary to find and deal with all kinds of faults in the operation of the cooling tower in time to ensure its safe, efficient and stable operation.

1.  4 large pieces of cold storage refrigeration system

01.  compressor

Refrigeration compressor is one of the main equipment of cold storage, the correct selection is very important, the refrigeration capacity of the refrigeration compressor and the power of the motor with the ratio, and the evaporation temperature and condensing temperature have a close relationship.

The condensing temperature and evaporation temperature are the main parameters of the refrigeration compressor, which is called the refrigeration condition. After calculating the refrigeration load of the cold storage, you can select the compressor unit with the appropriate cooling capacity.

The most commonly used refrigeration compressors in cold storage refrigeration systems are piston and screw types, and now scroll compressors are slowly becoming the most commonly used compressors in small cold storage systems.

02.  Heat exchange equipment: condenser

According to the cooling method and condensing medium, the condenser can be divided into water-cooled, air-cooled, and water-air mixed cooling.

03. throttling device

The throttling mechanism is one of the four major parts of the cold storage refrigeration system, and it is an indispensable component to realize the steam refrigeration cycle. Its function is to reduce the temperature and pressure of the refrigerant in the reservoir after throttling, and at the same time, adjust the flow rate of the refrigerant according to the change of load.

According to the adjustment mode in use, the throttling mechanism can be divided into: manually adjusted throttle valve, liquid level adjusted throttle valve, unadjustable throttling mechanism, electronic expansion valve adjusted by electronic pulse, and thermodynamic expansion valve adjusted by steam superheat.

04.  Heat exchange equipment: evaporator

The evaporator is one of the four important parts of the cold storage refrigeration system, which uses the liquid refrigerant to evaporate at low pressure, absorb the heat of the cooled medium, and achieve the purpose of reducing the temperature of the cooling medium.

The evaporator is divided into two types: the evaporator for cooling liquid and the evaporator for cooling gas.

The evaporator used in the cold storage is the evaporator of cooling gas, one is the evaporation cold storage pipe with air as natural convection, and the other is the evaporation cold storage pipe with air as natural convection.

2. 8 auxiliary equipment for cold storage refrigeration system

Auxiliary equipment: oil separator, gas-liquid separator, filter drier, solenoid valve, liquid reservoir, oil collector, intercooler, evaporation pressure regulator.

01.  Oil separator

Function: After separating the refrigerant in the refrigerant on the exhaust pipeline, the refrigerant oil directly enters the crankcase of the compressor, reducing the amount of oil carried to the refrigeration system and reducing the impact on the heat transfer effect of the heat exchanger.

Application: Refrigeration systems with medium and low temperature ranges and long pipelines (liquid supply pipes, suction pipes).

02. Gas-liquid separator

Function: The low-temperature and low-pressure refrigerant gas separates the unevaporated refrigerant liquid in the evaporator of the refrigeration system before entering the suction valve of the compressor, preventing the compressor from producing a wet stroke (liquid shock).

Application: medium and low temperature working conditions.

03.  filter driers

Function: Absorb water in liquid refrigerant and filter dirt and impurities in refrigerant. It is generally installed at the refrigerant outlet of the reservoir and water-cooled condenser. There are often several types of water filtration, impurity filtration, and acid filtration.

04.  solenoid valve

Function: When the compressor stops running, the solenoid valve is closed to prevent the high-pressure refrigerant from entering the low-pressure system. There is no liquid shock when the compressor starts again. Installation position: 100 mm~200 mm away from the thermodynamic expansion valve.

05.  Reservoir

Function: When the working conditions change or the refrigeration capacity is adjusted, it can balance and stabilize the refrigerant flow in the system, so that the refrigeration device can operate normally. The volume should be able to hold all refrigerants, up to 80% of the volume of the container.

06.  Oil collector

Function: In the parallel system, it is often used to collect the oil separated from each oil, so that the oil separator works normally, and the oil is returned to the compressor.

07.  Evaporator pressure regulator

The main function of the evaporation pressure regulator is to keep the internal pressure of the evaporator constant, therefore, it will turn on and off according to the load of the evaporator. Changes in pressure at the outlet of the regulator do not affect the degree of opening, as the regulator is equipped with an equalized bellows (the area of the bellows and the seat are equal). The evaporation pressure regulator has a pressure gauge interface for setting the desired evaporation pressure.

08.  Intercooler

Function: It is mainly used in the low-temperature system of two-stage or multi-stage compression refrigeration cycle to cool the superheated vapor discharged from the low-pressure stage, ensure the intermediate pressure, and reduce the compression ratio.