Which is the best full liquid screw chiller?

The difference between a flooded screw chiller and a general screw chiller:

Compared with the dry screw chiller, the main difference between the flooded screw chiller and the dry screw chiller is that the flooded chiller uses a flooded evaporator, and the dry chiller uses a dry evaporator.

In the flooded evaporator, the refrigerant goes through the shell, and the ice water goes through the pipe, in other words, the refrigerant goes outside the copper pipe, and the ice water goes inside the copper pipe.

Dry evaporators are the opposite, the refrigerant goes through the pipe, and the ice water goes through the shell, in other words, the refrigerant goes inside the copper pipe, and the ice water goes outside the copper pipe.

Comparison of the two:

1. Working conditions and reliability.

The flooded unit has many components, complex circuits, and low reliability of the unit. The dry-type unit has few components, simple circuits, and reliable operation. The flooded unit is suitable for operation under fixed working conditions, and the change of working conditions is easy to cause the unit to fail, while the dry unit can adapt to the operation of variable working conditions.

2. Oil return performance.

In the case of miscible lubricating oil and refrigerant, the oil return power of the flooded evaporator is the pilot pump, which is difficult and unstable, and the oil return condition directly affects the working condition of the unit. The oil return power of the dry unit is high and low pressure difference, and the oil return is stable and convenient.

3. Liquid filling volume.

The shell of the flooded evaporator is filled with refrigerant and has a large liquid filling capacity, which is mostly used for open compressors with easy leakage of refrigerant and some screw compressors with large refrigeration capacity. The refrigerant charge of the dry evaporator is only 1 2 1 3 of the flooded evaporator.

4. Energy efficiency. The flooded unit has high energy efficiency, and the same input power flooded unit has a large cooling capacity, and the cooling capacity is 10% 12% larger than that of the dry-type unit.

5. Cost. The cost of the flooded unit is high, and the cost of the dry-type unit is low.

Advantages and disadvantages of flooded liquid:

Advantages: the evaporator has high heat exchange efficiency, the energy efficiency is higher than that of the dry evaporator, and the volume of the unit with the same cooling capacity is slightly smaller than that of the dry type.

Disadvantages: 1. It is necessary to add a liquid level control device or a superheat control device to ensure that the refrigerant flow into the evaporator can maintain the liquid level at an appropriate height.

2. The liquid level control device or superheat control device is quite expensive, the maintenance and adjustment are very troublesome, and the adaptability performance is very poor when the unit meets the change.

3. If the refrigerant liquid level in the evaporator is reduced, the refrigeration oil miscible with the refrigerant in the evaporator is not easy to return to the compressor, which is the risk of oil loss in the compressor, which may directly lead to the burning of the compressor.

4. If the liquid level of the refrigerant in the evaporator is raised, the refrigerant will enter the compressor in liquid form, causing liquid compression, which will also cause the compressor to burn out.

5. The charging capacity of refrigerant and refrigeration oil in the whole system is more than twice that of dry type, and the maintenance cost will increase in the future.

6. Because the oil return of the flooded evaporator is very troublesome, the quality of the refrigerated oil is very high, and the refrigerated oil must be guaranteed to work under high quality. After a period of use, because the refrigeration oil will gradually thicken, the oil return will be very difficult and must be replaced immediately, and its service life is shortened by more than half compared with the dry evaporator, which greatly increases the operating cost.

7. When the chilled water flows in the copper tube of the evaporator, it is easy to form condensation due to the low temperature, which will cause the copper tube to burst and crack.

The one used in the factory is not bad, durable, intelligent operation, and I also listened to the recommendation of others, it seems to be called Kedley.

The difference between a flooded screw chiller and a general screw chiller: Compared with a flooded screw chiller, the most ...

Hello dear dear, it is a pleasure to serve you: I have not found out which media are needed for the flooded screw water-cooled chiller. You can refer to the following; For water-cooled screw chillers, R-22 type refrigerants are usually used.

The main chemical component of this refrigerant is difluorochloromethane, and the refrigeration effect of Daruma is very good. Screw chiller oil is generally in an environment mixed with refrigeration, so the solubility of the screw chiller oil has a great impact on the lubricity and refrigeration capacity of the screw chiller oil. Even if the lubricity of the screw chiller oil itself is good, its characteristics are also affected by the solubility of the refrigerant, and it is generally believed that the refrigerant is difficult to dissolve, and the lubricity of the lubricating oil is better.

When selecting the water-cooled screw, we should pay special attention to the following factors, we are Shenzhen Kaideli chiller, thank you, others generally will not tell you.

1.The main control parameters of the screw chiller are the refrigeration rate, rated refrigeration rate, input power, and refrigerant type.

2.The choice of chiller should be decided according to the load and usage of the chiller. For refrigeration units that operate for a long time under heavy load, it is advisable to choose multi-head piston compressor units or screw compressor units.

The rod compressor unit is easy to adjust and save energy.

3.When choosing a chiller, you should first choose a refrigeration unit with a large coefficient of performance value.

4.When selecting chillers, attention should be paid to the conditions of the nominal operating conditions. The specific cooling output of the chiller is related to the following factors:

5.Ambient temperature and flow rate of cold water effluent;

6.The ambient temperature, flow rate and fouling coefficient of the cooling water.

There are several factors that can be referred to when selecting a water-cooled screw chiller, and I hope to give you a few suggestions, I hope it will help.

Operation, maintenance and safety technology

Every type of chiller is safe and reliable, such as centrifugal chillers, water-cooled screw chillers, and absorption chillers, in terms of operation and maintenance, centrifugal and screw chillers are easy to maintain and have a long service life.

Refrigeration system investment calculations

Equipment is an important material and equipment for industrial production, involving a variety of factors, such as performance indicators, automation level, intelligence degree, etc., including the overall configuration, chiller system equipment, materials, installation costs, etc.

The water-cooled screw refrigeration unit has a higher refrigeration coefficient of operating costs, a lower investment cost, and a better energy-saving effect (compared with the absorption unit). The refrigeration efficiency of the centrifugal unit is slightly lower than that of the water-cooled screw, and the circulating energy consumption is slightly higher than that of the water-cooled screw unit.

In one is the cost estimation of different seasons, the water-cooled screw unit has obvious operating costs in summer, which is more efficient and energy-saving.

First of all, before choosing, understand the basic composition of a screw chiller:

Compressor: The compressor is the core component of the entire refrigeration system and the power source of refrigerant compression. Its function is to convert the input electrical energy into mechanical energy, compressing the refrigerant.

2.Shell and tube condenser: In the refrigeration process, the condenser plays the role of outputting heat energy and condensing refrigerant.

When the high-pressure superheated steam discharged from the refrigeration compressor enters the condenser, all the heat absorbed during operation, including heat absorbed from the evaporator, refrigeration compressor and pipes, is transferred to the surrounding medium (water or air) to be taken away. The high-pressure superheated steam of the refrigerant recondenses into a liquid.

2.The composition of the screw chiller: water-cooled and air-cooled 1.

The cooling method of the main engine of the air-cooled screw chiller is the combination of fin evaporator and fan, and the air-cooled screw chiller is generally placed outdoors and should be fully cooled. 2.The main engine of a water-cooled screw chiller is equipped with a water tower and a cooling pump (sometimes depending on the pump provided by the customer), through which the heat is dissipated by the continuous circulation of the pump.

Thirdly, the screw chiller can only be selected at a minimum of 30hp. I often have customers ask me about 20hp and want to make screw chillers. Generally, the units below 30hp on the market are scroll chillers or piston chillers.

4.Commonly used compressor product brands of screw chillers, such as: Hanzhong in Taiwan Province, Bissell in Germany, Laifukang in Italy, Fu Sheng in Taiwan Province) with unloading and automatic capacity adjustment of the spool valve mechanism, the capacity adjustment level is %, %.

Controlled by a four-stage solenoid valve, it can still work efficiently and reliably under special working conditions.

5.When choosing a compressor, special attention should be paid to the general three-stage type below the head of the general 50hp compressor, and the four-stage type with a 60hp time scale was made for the air-cooled twin-screw chiller of the Great Wall Motors project last time, but an error was found in the later acceptance, so as not to remind the customer during the design.

6. Screw chiller cold coal selection and voltage, commonly used domestic R22 environmental protection cold coal R404A R134A R407C; Voltage: Sanxiang 200v 50 60hz 380v 50hz 60hz 440v 50hz 60hz (commonly used in China 380v 50hz).

7. The application of screw chiller:

1.The working range of room temperature is 5 to 30 degrees, the working range of low temperature is minus 5 to minus 30 degrees, and the working range of ultra-low temperature is minus 30 to minus 120 degrees (the actual required temperature and refrigeration capacity are given, and other manufacturers can design according to the situation). 2.

Whether there is a corrosive industry, solution contact and heat exchanger material according to the actual situation, there are generally stainless steel 304 316 316L titanium tubes, alloy copper and other materials on the market. 8. Screw chillers are divided into single screw and twin screws, that is, a unit has several systems (several compressors) that can be controlled and operated independently, and the energy efficiency ratio of the twin-screw type is better and safer than that of the single-screw type.

The water-cooled screw chiller is also a kind of chiller, because its main component uses a screw compressor, so the name can be called a water-cooled screw chiller. Its freezing 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 need to use chilled water, or large shopping malls, hotels, factories, hospitals and other areas that need to use chilled water for centralized cooling in various ** air conditioning projects.

The basic components of the water-cooled screw chiller system: Condenser: In the refrigeration process, the condenser plays the role of outputting heat energy and enabling the refrigerant to condense. After the high-pressure superheated vapor discharged from the refrigeration compressor enters the condenser

Water-cooled screw chiller is a type of chiller, which is currently popular because of its beautiful appearance, stable performance, stable operation, wide range of uses and other advantages.

Because its main component uses a screw compressor, the name can be called a water-cooled screw chiller.

Kaideli chiller is a professional R & D and production of chiller source manufacturers, roughly there are two kinds of air-cooled screw and water-cooled screw, the working process of air-cooled chiller is roughly the same as that of water-cooled chiller, the difference is that the condenser of water-cooled chiller adopts shell-and-tube heat exchanger, and the condenser of air-cooled chiller adopts finned heat exchanger.

System schematic: Refrigerant cycle: Jet enthalpy: For the same compressor, under the same evaporation temperature and condensation temperature, the COP value is increased by 6% and 8%; At the same time, the compressor discharge temperature will drop by 1

As a commonly used refrigeration equipment, the advantages and disadvantages of screw chiller are as follows:

Advantages: High efficiency and energy saving: Compared with traditional reciprocating compressors, screw compressors have higher refrigeration efficiency and can be more energy-saving during operation.

Strong stability: Due to the relatively simple structure of the screw compressor, the vibration and noise of the reciprocating compressor are reduced during the refrigeration process, and the stability and reliability of the unit are improved.

Easy to operate: Screw chillers are simple to operate, relatively simple in terms of installation and maintenance, and have a relatively long service life.

Wide adaptability: Screw chillers are suitable for the refrigeration needs of different places, and can be applied to different fields such as commercial buildings, office buildings, and industrial manufacturing.

Disadvantages: Higher maintenance costs: Screw chillers have higher maintenance and repair costs, require regular maintenance, and have higher labor and material costs.

High maintenance technical requirements: Screw chillers have high maintenance technical requirements, which require professional and technical personnel to operate and maintain.

Need to cooperate with cooling water source: Compared with air cooling, Luozhen rod chiller needs to have a cooling water source, if there is no suitable cooling water source, it cannot be used normally.

In general, the screw chiller has the advantages of high efficiency and stability, but there are certain shortcomings and challenges in terms of maintenance and maintenance.

You can understand the screw chiller with medium energy temperature control as early as possible, and the quality is guaranteed!

Advantages of Luozheng pole chiller:

1. The structure is simple, the moving parts are few, the wearing parts are few, only the piston type is 1 10, the failure rate is low, and the life is long;

2. The circular motion is stable, there is no "surge" phenomenon during low-load operation, low noise and low vibration;

3. The compression ratio can be as high as 20, and the EER value is high;

4. Easy to adjust, stepless adjustment in the range of 10% and 100%, high efficiency and significant power saving under partial load;

5. Small size, light weight, can be used as a standing fully enclosed large-capacity unit; Messy stools.

6. Insensitive to wet stroke; 7. It is a positive pressure operation, and there is no problem of external gas intrusion and corrosion.

Disadvantages: 1. Higher than piston type;

2. The capacity of the stand-alone machine is smaller than that of the centrifugal type, and the speed is lower than that of the centrifugal type;

3. The lubricating oil system is complex and the oil consumption is large;

4. The noise of the large-capacity unit is higher than that of the centrifugal type;

5. High processing accuracy and assembly accuracy are required.