The working principle of water-cooled screw chiller

The working principle of water-cooled screw chiller

The water-cooled screw chiller is also a type of chiller. Because its main components use a screw compressor, the name can be It is called water-cooled screw chiller. Its frozen water temperature range is 3℃~20℃, which can be widely used in plastics, electroplating, electronics, chemicals, pharmaceuticals, printing, food processing and other industrial refrigeration processes that require the use of chilled water, or in large shopping malls, hotels, Factories, hospitals and other areas where central air-conditioning projects require the use of chilled water for centralized cooling.

The water-cooled screw chiller is mainly composed of a semi-hermetic screw compressor, a shell and tube condenser, a dry filter, a thermal expansion valve, a shell and tube evaporator, and an electrical control part.

Working principle of water-cooled screw chiller:

When the unit is cooling, the compressor sucks the low-temperature and low-pressure refrigerant in the evaporator into the cylinder. After the compressor does work, the refrigerant vapor is compressed into High-temperature and high-pressure gas enters the condenser through the exhaust pipe. The high-temperature and high-pressure refrigerant gas exchanges heat with the cooling water in the condenser, transfers the heat to the cooling water, and the refrigerant gas condenses into a high-pressure liquid. The high-pressure liquid from the condenser is throttled and decompressed by the thermal expansion valve and then enters the evaporator. In the evaporator, the low-pressure liquid refrigerant absorbs the heat of the chilled water and vaporizes, cooling the chilled water and turning it into the required low-temperature water. The vaporized refrigerant gas is sucked back into the compressor, compressed, and discharged into the condenser. This cycle continues to cool the chilled water.

The chilled water from the unit enters the indoor fan coil unit, variable air volume air conditioner and other terminal devices, and exchanges heat with the convective air indoors. During this process, the water absorbs the indoor air. The temperature rises due to heat (dissipating heat to the indoor air), and the temperature of the indoor air drops after passing through the indoor heat exchanger. Driven by the fan, it is sent indoors, thereby reducing the indoor air temperature, and the chilled water after the temperature rises is in the water pump. It re-enters the unit under the influence and circulates in this way to achieve the purpose of continuous refrigeration.

Product features of water-cooled screw chiller:

(1) The compressor of the unit adopts famous brand semi-hermetic screw compressor and electronic control components, and is equipped with high-quality copper tubes with high heat exchange efficiency. condenser and evaporator;

(2) Equipped with various safety protection devices, with stable performance, low noise, long service life and simple operation; using LCD display human-machine interface, the operation is simple and convenient, and the execution status It is clear at a glance;

(3) The models adopt single compressor or multi-compressor combined refrigeration system. The compressors can automatically operate alternately according to load changes, balancing the execution hours of each compressor, thereby saving energy consumption and extending the service life of the chiller. It is convenient for energy adjustment and is more energy-saving under partial load;

(4) Open structure, the whole machine has beautiful appearance and simple structure. The performance of the unit can be checked at any time, and the installation and maintenance are simple and convenient; Water-cooled screw type Principle of chiller

System composition

Water-cooled screw chiller mainly consists of semi-hermetic screw compressor, shell and tube condenser, dry filter, thermal expansion valve, shell and tube It is composed of evaporator and electrical control part.

The water-cooled screw chiller is also a type of chiller. Because its main component uses a screw compressor, the name can be called a water-cooled screw chiller. Its frozen water temperature range is 3℃~20℃, which can be widely used in plastics, electroplating, electronics, chemicals, pharmaceuticals, printing, food processing and other industrial refrigeration processes that require the use of chilled water, or in large shopping malls, hotels, Factories, hospitals and other areas where central air-conditioning projects require the use of chilled water for centralized cooling.

Working principle

When the unit is cooling, the compressor sucks the low-temperature and low-pressure refrigerant in the evaporator into the cylinder. After the compressor performs work, the refrigerant vapor is compressed into high-temperature and high-pressure gas.

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Enter the condenser through the exhaust pipe. The high-temperature and high-pressure refrigerant gas exchanges heat with the cooling water in the condenser, transfers the heat to the cooling water, and the refrigerant gas condenses into a high-pressure liquid. The high-pressure liquid from the condenser is throttled and decompressed by the thermal expansion valve and then enters the evaporator.

In the evaporator, the low-pressure liquid refrigerant absorbs the heat of the chilled water and vaporizes, cooling the chilled water to become the required low-temperature water. The vaporized refrigerant gas is sucked back into the compressor, compressed, and discharged into the condenser. This cycle continues to cool the chilled water.

The chilled water from the unit enters the indoor fan coil unit, variable air volume air conditioner and other terminal devices, and exchanges heat with the convective air indoors. During this process, the water absorbs the indoor air. The temperature rises due to heat (dissipating heat to the indoor air), and the temperature of the indoor air drops after passing through the indoor heat exchanger. Driven by the fan, it is sent indoors, thereby reducing the indoor air temperature, and the chilled water after the temperature rises is in the water pump. It re-enters the unit under the influence and circulates in this way to achieve the purpose of continuous refrigeration.

Product Features

(1) The compressor of the unit adopts famous brand semi-hermetic screw compressors and electronic control components, and is equipped with condensers and evaporators made of high-quality copper tubes with high heat exchange efficiency;

(2) Equipped with various safety protection devices, it has stable performance, low noise, long service life and simple operation; it adopts LCD display human-machine interface, which makes operation simple and convenient, and the execution status is clear at a glance;

< p> (3) The models adopt single compressor or multi-compressor combined refrigeration system. The compressors can automatically operate alternately according to load changes, balancing the execution hours of each compressor, thereby saving energy consumption and extending the service life of the chiller. It is convenient for energy adjustment and is more energy-saving under partial load;

(4) Open structure, the whole machine has beautiful appearance and simple structure. The performance of the unit can be checked at any time, and the installation and maintenance are simple and convenient; Air-cooled screw Working principle of air-cooled screw chiller

Air-cooled screw chiller is named air-cooled screw chiller because its key component-the compressor adopts screw type. The refrigerant coming out of the evaporator of the unit is gas; after After the compressor performs adiabatic compression, it becomes a high temperature and high pressure state. The compressed gas refrigerant is isobarically cooled and condensed in the condenser. After condensation, it changes into liquid refrigerant, and then expands to low pressure through the throttle valve and becomes a gas-liquid mixture. The liquid refrigerant under low temperature and low pressure absorbs the heat of the cooled material in the evaporator and becomes a gaseous refrigerant again. The gaseous refrigerant re-enters the compressor through the pipeline and starts a new cycle. These are the four processes of the freezing cycle. It is also the main working principle of screw chiller.

Water-cooled screw chiller

This is a low-temperature chiller, a screw cascade chiller. It has such a large cooling capacity. It is so big. This one is so expensive. A set costs almost one million. , this non-standard product is generally used in the pharmaceutical and chemical industries. For specific circumstances, you can contact Kaidley Chiller. We use a minus 25-degree, saltwater low-temperature screw chiller. Maintenance methods of screw chillers

1. Regularly check whether the voltage and current of the chiller are stable, and whether the compressor operating sound is normal. When the chiller is working normally, the voltage is 380V and the current It is normal within the range of 11A-15A.

2. Regularly check whether the chiller refrigerant is leaking: you can refer to the parameters displayed on the high and low pressure gauges on the front panel of the host to determine. Depending on the temperature change (winter, summer), the pressure display of the chiller is also different. When the chiller is working normally, it is normal for the high pressure display to be 11-17kg and the low pressure display to be within the range of 3-5kg.

3. Check whether the water dissipation system of the chiller is normal, whether the cooling tower fan and sprinkler shaft are operating well, and whether the water replenishment of the built-in water tank of the chiller is normal.

4. System cleaning should be done when the chiller is used for six months, and once a year. The main cleaning parts include: cooling water tower, water pipes and condenser parts to ensure better cooling effect.

5. When the water chiller is not used for a long time, circuit switches such as water pumps, compressors, and the main power supply of the water radiator tower should be turned off in time.

Water-cooled chillers need to be equipped with cooling water towers and loop water pump connections to achieve the cooling effect. To ensure the quality of loop water, consider installing a filter at the water source to prevent impurities from entering the pipes and affecting the unit. implement.

What is the principle of air-cooled screw chiller?

Zeng Gong of Kaidley Chiller R&D Department analyzed it as follows:

Air-cooled screw chiller is named air-cooled screw chiller because its key component - the compressor adopts screw type. , the refrigerant that comes out of the evaporator of the unit is in a gaseous state; after being adiabatically compressed by the compressor, it becomes a high-temperature and high-pressure state. The compressed gas refrigerant is isobarically cooled and condensed in the condenser. After condensation, it changes into liquid refrigerant, and then expands to low pressure through the throttle valve and becomes a gas-liquid mixture. The liquid refrigerant under low temperature and low pressure absorbs the heat of the cooled material in the evaporator and becomes a gaseous refrigerant again. The gaseous refrigerant re-enters the compressor through the pipeline and starts a new cycle. These are the four processes of the freezing cycle. It is also the main working principle of screw chiller.

Kaidley answered this:

The air-cooled screw chiller is named air-cooled screw chiller because its key component-the compressor adopts screw type. The unit is composed of evaporator The refrigerant that comes out of the compressor is a gas; after being adiabatically compressed by the compressor, it becomes a high-temperature and high-pressure state. What is the principle of water-cooled screw chiller?

Just like household air conditioners, evaporation, suction, compression, exhaust, condensation and throttling. It's just that the structure is different, but the principle is exactly the same

The main core components of the unit include: compressor, condenser, filter dryer, gas-liquid separator, expansion valve, evaporator, and control instruments and control components.

Refrigeration principle: When the refrigeration system is working, the high-temperature and high-pressure refrigerant gas discharged from the compressor enters the condenser and is condensed into a medium-temperature supercooled liquid. It is throttled and decompressed by the low-temperature expansion valve and becomes a low-temperature and low-pressure vapor liquid. The two-phase mixture enters the evaporator, evaporates in it and absorbs the heat of the refrigerant flowing through the evaporator, so that the refrigerant flowing through the evaporator can be cooled. After the refrigerant vaporizes, the steam is then sucked into the compressor and returned continuously. circle to achieve the purpose of cooling. What is the refrigeration principle of screw chiller?

To put it simply, after the compressor is running, it extracts the (gaseous) refrigerant in the evaporator, reduces the pressure in the evaporator, and then compresses the low-pressure gaseous refrigerant to high pressure and discharges it into the condenser. At this time, due to the work of the compressor, the refrigerant temperature is very high. The high-pressure gaseous refrigerant is cooled by wind or water and becomes high-pressure liquid refrigerant (the temperature has dropped to nearly normal temperature), and is pressed into the evaporator. At the same time, a throttling device is set between the evaporator and the condenser, so that when the high-pressure refrigerant passes through, the pressure is instantly reduced. At the same time, because the compressor continuously pumps air, the saturation temperature of the refrigerant (that is, the "boiling point") is lowered. , during the air conditioning working condition of the flooded chiller, the temperature is about 5°C, and the dry chiller is about 2°C), so the low-pressure refrigerant in the evaporator continues to boil, and the boiling process is endothermic, so the water flowing into the evaporator, heat Being sucked away, the temperature drops when it leaves the evaporator. As long as the cooling capacity is large enough, it can be lowered to the set temperature, usually 7°C for the outlet water, and then maintained at 12°C for the inlet water. The more popular answer is this. Although it is not rigorous, it is roughly the same.