What is Centrifugal Chiller?

 

 

Centrifugal chiller means air conditioning equipment that utilizes a centrifugal compressor in a vapor-compression refrigeration cycle typically used for commercial comfort air conditioning. Centrifugal chiller in this definition is a chiller intended for comfort cooling and does not include cooling for industrial process cooling and refrigeration.

 

Advantages of Centrifugal Chiller

Have the characteristics of large air volume and high wind pressure

The design of the centrifugal chiller enables it to generate a large amount of cold air through a rotating centrifugal wind wheel. Compared with other types of chillers, centrifugal chillers have a higher wind pressure and can send cold air to further places.

Have high energy efficiency

The structure design of centrifugal chiller can minimize the energy loss and improve the energy utilization rate during operation. Compared with traditional chillers, centrifugal chillers can work with higher efficiency and achieve the same cooling effect.

 

Have a lower noise level

Due to the working principle and structural design of centrifugal chillers, the noise generated during operation is lower than that of other types of chillers. This makes centrifugal chillers more suitable for use in places that need to maintain a good working environment .

Can also be intelligently controlled

Many centrifugal chillers are equipped with advanced sensors and control systems that can monitor ambient temperature and humidity in real time and automatically adjust wind speed and volume as needed.

 

 

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Types of Centrifugal Chiller
 

Turbocharger centrifuge
Turbocharger centrifugal chiller or turbocharger chiller is a centrifugal chiller that works without oil, without mechanical contact and without friction. This means that the chiller of the turbocharged centrifuge chiller is based on a magnet. In a turbocharged centrifugal chiller, the impeller creates a magnetic field during operation and rotation, so that no contact is made with the magnetic bearings.

 

Cool water centrifuge chiller and air cooler
For centrifugal chillers, like any other compression chiller, two types of cold water and cool air are defined. Speaking of these two types, it goes back to the type of operation of the chiller condenser. It basically means what the driving force of a condenser is and whether a condenser uses water or the surrounding air to cool itself.

 

Closed, semi-closed and open centrifugal chiller
There are three types of open, closed and semi-closed systems for centrifugal chillers. The opening and closing of these chillers depend on how the mechanical and electrical parts of the chiller are connected. In fact, different parts of a chiller are formed, each of which was used in a special way. In a centrifugal chiller, mechanical equipment such as impellers are considered mechanical parts, and the chiller motor is powered by electricity to provide propulsion to the mechanical parts.

 

How Do Centrifugal Chillers Works

 

Evaporator
An evaporator in a centrifugal water-cooled chiller is the heat exchanger that removes heat from the entering chilled water. A shell and tube heat exchanger is the most common configuration.
The heat changes the refrigerant from a liquid to a gas. A flooded evaporator is an energy-efficient choice. Chilled water circulates in the tubes and refrigerant completely submerges the tubes in the shell.

Compressor
A centrifugal compressor converts rotational kinetic energy to the dynamic energy of fluid flow. Refrigerant enters the pump impeller and is accelerated, flowing radially outward, then exits. A frictionless centrifugal compressor uses magnetic bearing technology and a dc (direct current) motor drive.
The process raises the pressure of the refrigerant by converting kinetic energy into pressure and heat.

Condenser
Similar to an evaporator, a condenser is also typically a shell and tube heat exchanger. The condenser removes heat from the refrigerant gas. The pressurized refrigerant condenses to a liquid.
The heat raises the temperature of circulating condenser water the condenser water then carries the heat away to the cooling tower where the excess heat is ejected to the atmosphere.

Expansion device
After the refrigerant condenses to a liquid, it passes through a device to reduce pressure. It can be a simple orifice plate or an electronic modulating valve.

 

 
 
Components of Centrifugal Chillers
Oil Free Maglev Centrifugal Chiller

Impellers

Impellers are rotating components that use centrifugal force to compress the refrigerant gas. They consist of curved blades or vanes that accelerate the gas and direct it towards the diffuser.

Magnetic Bearing Centrifugal Chiller With Hanbell Compressor

Shafts and bearings

The shafts and bearings provide support and enable the rotation of the impeller. They ensure smooth operation, reduce friction, and minimize wear and tear.

Direct Cooling Magnetic Levitation Centrifugal Water Chiller

Diffusers

Diffusers receive the high-velocity gas from the impeller and convert its kinetic energy into pressure energy. They slow down the gas flow and evenly distribute it to the next stage of compression.

 

800 Ton Magnetic Chiller

Housings

Housings or casings enclose the impeller and other internal components, creating a controlled environment for compression. They are designed to withstand high pressures and maintain the structural integrity of the compressor.

 

Types of Applications of Chillers Centrifugal in Compressor Components
1

Air conditioning

Chillers centrifugal are extensively used in large-scale air conditioning systems for commercial buildings, such as offices, hotels, and shopping malls. They provide chilled water for cooling the air and maintaining comfortable indoor temperatures.

2

Industrial cooling

Centrifugal chillers are employed in industrial cooling applications, such as cooling equipment, processes, and manufacturing facilities. They help regulate temperatures and ensure optimal operating conditions for machinery and products.

3

Refrigeration

Centrifugal chillers play a vital role in refrigeration systems, including cold storage facilities, food processing plants, and supermarkets. They provide the necessary cooling for preserving perishable goods and maintaining the quality and safety of refrigerated products.

4

Process cooling

Many industrial processes require precise cooling to achieve desired product quality or facilitate specific reactions. Centrifugal chillers are used in industries such as pharmaceuticals, chemicals, and plastics to provide process cooling, ensuring efficient production and optimal results.

 

The Working Principle aand Working Process of Centrifugal Chiller

 

 

The working principle of a centrifugal chiller is based on the refrigeration cycle, in which the compressor, evaporator, condenser and expansion valve play a key role. In the refrigeration cycle, the refrigerant absorbs heat and evaporates in the evaporator, is compressed by the compressor, then removes heat and condenses in the condenser, and finally flows back to the evaporator through the expansion valve. This process circulates continuously to achieve the purpose of refrigeration.

The centrifugal ice-water unit produces chilled water at 7℃-12℃ for use in the air treatment system and process cooling water at 18℃-23℃. The cooling method is mainly open cooling tower cooling.

Compression process: The compressor is the core component. It compresses low-pressure refrigerant gas into high-pressure gas to provide power for the entire refrigeration cycle.

Heat exchange process: In the evaporator, the refrigerant absorbs heat from the air and evaporates; in the condenser, the refrigerant releases heat and condenses.

 

Application of Centrifugal Chiller

Commercial and office buildings
Centrifugal chillers are widely used in commercial and office spaces that require large amounts of cooling capacity, such as high-rise buildings, shopping malls, and office buildings. This kind of unit can meet the needs of large-scale refrigeration and achieve the purpose of energy saving and environmental protection.

Industrial production
Centrifugal chillers are also widely used in many industrial production fields, such as pharmaceutical, chemical, electronics, textile, food and other industries. These areas need to maintain a constant temperature and humidity environment to ensure production quality, and centrifugal chillers play an important role in this regard.

Other areas
Centrifugal chillers are also widely used in public places such as hospitals, universities, conference centers and airports, as well as large entertainment facilities such as swimming pools and ice rinks.

 

What You Should Know When Use Centrifugal Chiller
R134a Magnetic Bearing Centrifugal Chiller
Water Cooled Centrifugal Chillers Single Unit
Centrifugal Water Chiller Double Unit
Variable Frequency Centrifugal Chiller Unit

Safe to use
The chiller is an electrical equipment. Users need to ensure that the power supply and circuit of the equipment are normal before operation to avoid safety accidents caused by circuit failures. In addition, pay attention to the safety protection measures around the equipment, such as the placement of the equipment, the setting of protective panels, etc.

Cleaning and maintenance
After a chiller is used for a period of time, a certain amount of dirt and bacteria will often develop inside the radiator and cooling water pipes, so the equipment needs to be cleaned and maintained regularly. When cleaning, be sure to turn off the power and drain the water in the water tank, and use special cleaning agents to thoroughly clean the inside and outside of the equipment. In addition, cooling water filters should be cleaned and replaced regularly to ensure clean water quality and smooth circulation.

Equipment operating status monitoring
Users should regularly monitor the operating status of the equipment when using the chiller, especially whether the temperature and noise of the equipment shell are normal. If the equipment is found to be overheated or the noise is abnormally loud, it should be stopped in time for inspection and the dust and debris inside the equipment should be cleaned. In addition, it is necessary to regularly check the operation of the cooling water pump of the equipment and the stability of the power supply voltage to ensure the normal operation of the equipment.

Prevent condensation from accumulating
The chiller will produce a large amount of condensed water during operation, so a proper drainage system needs to be installed to prevent the accumulation of condensed water. When designing the chiller drainage system, ensure that the drainage pipes are unobstructed and set up appropriate slopes and exhaust devices to quickly remove condensed water.

Control equipment operating temperature
When the chiller is working, the outlet water temperature is generally controlled to meet the cooling needs during the production process. Therefore, during the use of the equipment, it is necessary to set a reasonable outlet water temperature according to actual needs to avoid excessively high or low water temperatures from adversely affecting the production process.

Control equipment load
During the use of the chiller, the load of the equipment needs to be adjusted according to actual needs. During the production process, when the load is large, the working capacity of the chiller can be appropriately increased to meet demand; when the load is small, the working capacity of the chiller can be reduced to save energy.

Control device runtime
The running time of a chiller often affects its service life and energy consumption. Therefore, during use, attention should be paid to reasonably arranging the running time of the equipment and avoiding long-term continuous operation to reduce energy consumption and wear and tear of the equipment.

With automatic fault alarm function
In order to detect equipment faults in time and take corresponding countermeasures, the chiller should usually have an automatic fault alarm function. During use, it is necessary to regularly check whether the equipment's alarm system is working properly to ensure that the equipment can promptly remind users and perform repairs when a fault occurs.

Timely maintenance
When a chiller fails or an abnormality occurs, the equipment needs to be repaired and maintained in time to prevent the failure from expanding and affecting normal production. If possible, it is recommended to ask professionals to conduct comprehensive inspection and maintenance of the equipment regularly to extend the service life of the equipment.

Proper use of cooling water
The chiller needs to use cooling water for heat dissipation and cooling during operation, so cooling water resources need to be used rationally. During use, attention should be paid to reducing the waste of cooling water, and cooling water pipes should be cleaned and replaced in time to avoid contamination and blockage that will lead to a decrease in heat dissipation effect.

 

FAQ

 

Q: What is the difference between a centrifugal chiller and a screw chiller?

A: Capacity and load profile: Centrifugal chillers are suitable for high-capacity applications, while screw and mag-bearing chillers offer better part-load efficiency. Noise sensitivity: For noise-sensitive environments, screw chillers and mag-bearing chillers are preferable due to their lower sound levels.

Q: What is the difference between centrifugal chiller and absorption chiller?

A: A centrifugal chiller is one of the chiller types that uses a mechanical compressor. Absorption chillers: These chillers send steam or hot water through tubes, where they boil off the refrigerant and turn into vapor, which moves into the condenser.

Q: What type of refrigerant is in a centrifugal chiller?

A: Hfc and hfo based refrigerants are widely used due to their technical and safety properties, with low or non-flammability being required for many locations. One equipment manufacturer now offers its oil-free water cooled centrifugal chiller with non-flammable r-515b refrigerant (gwp 293 ar4 f-gas).

Q: How a centrifugal chiller system works?

A: Basically, centrifugal chillers use a centrifugal compressor to spin the refrigerant vapor which comes from an impeller wheel's center outward, allowing the centrifugal forces to compress it. Some centrifugal machines make use of more than one impeller for compressing the refrigerant via several stages.

Q: What are the advantages of centrifugal chillers?

A: So, the main advantage of using a centrifugal chiller would getting high cooling capacity in a relatively small footprint, plus high operational efficiency. Think about cruise ships requiring high cooling capacity to serve all the different environments on board.

Q: What type of compressor does a centrifugal chiller use?

A: As the name suggests, centrifugal compressors use centrifugal force to compress refrigerant vapor. They are designed to manage projects with large cooling loads, such as a manufacturing floor where multiple heat-intensive processes take place.

Q: What is the capacity range of a centrifugal chiller?

A: Centrifugal chillers are available in sizes ranging from 70 to 2,500 tons factory-assembled and up to 9,000 tons field-assembled. They use hcfc-123, hfc-134a, or hcfc-22 refrigerants.

Q: What application are most centrifugal chillers used for?

A: Centrifugal chillers are typically the most economical chiller to use for cooling sizable buildings. They can efficiently produce a high flow rate and are ideal for larger applications.

Q: Where is refrigerant added in a centrifugal chiller?

A: Refrigerant is added to a centrifugal machine through the: Evaporator charging valve. What is meant by the term "high efficiency purge unit?" those purge units which discharge a low percentage of refrigerant with the air which they remove.

Q: What is the useful life of centrifugal chiller?

A: Water-cooled centrifugal chillers have been known to last more than 25 years. Centrifugal chillers are complex and often have more moving parts than any other piece of equipment in a plant.

Q: Are centrifugal chillers water-cooled?

A: Since most centrifugal chillers are water-cooled, they are the primary focus of this clinic. Water-cooled centrifugal chillers are generally available from 100 to 3,000 tons [350 to 10,500 kw] as prefabricated machines, and up to 8,500 tons [30,000 kw] as built-up machines.

Q: Is a screw chiller a centrifugal chiller?

A: A screw type chiller is best for cooling small amounts of water to a moderate temperature. A centrifugal chiller is a type of chiller that uses centrifugal force to cool water. The water enters the machine through the inlet and then exits through the outlet pipe.

Q: What is the difference between centrifugal chiller and absorption chiller?

A: A centrifugal chiller is one of the chiller types that uses a mechanical compressor. Absorption chillers: These chillers send steam or hot water through tubes, where they boil off the refrigerant and turn into vapor, which moves into the condenser.

Q: How do you prevent centrifugal chiller surge?

A: The way to protect a chiller from surge is to decrease the compressor lift being required. Chiller tube fouling can be prevented by utilizing automatic tube cleaning systems and water treatment programs to prevent chiller tube fouling and ensure heat transfer is optimized.

Q: How does a centrifugal chiller control capacity?

A: The function of the centrifugal chiller is the delivery of chilled water of at a given temperature. If the actual leaving chilled water temperature is higher than its set point value, compressor capacity needs to be increased. This is achieved by opening the inlet guide vanes more.

Q: What size are centrifugal chillers?

A: A rotating impeller is used to accelerate the refrigerant and allow the conversion of velocity energy into pressure energy. Centrifugal chillers start at approximately 200 tons and go up to thousands of tons depending on the number of compressors.

Q: What is the temperature of a centrifugal chiller?

A: A centrifugal chiller for general air conditioning applications is a device for cooling chilled water to approximately 5 to 7 ℃, and the main difference between the centrifugal chiller for brine and the centrifugal chiller for general air conditioning applications is the use of brine and the cooling temperature.

Q: What are the types of chiller?

A: The chiller system can be classified into two types namely, air-cooled and water-cooled. Air-cooled systems are cheaper than water-cooled systems as they do not need expensive water pumps or condensers.

Q: How many degrees is a chiller?

A: A water chiller typically operates with a set point of 50°f or higher. However, if setpoints between 20°f - 48°f are required, special precautions must be taken to prevent freezing and possible damage. Attention must be given to freeze protection, water supply and pressure switch limit adjustments.

Q: What is the main function of the impeller in a centrifugal chiller?

A: An impeller is a rotating component of a centrifugal pump that accelerates fluid outward from the center of rotation, thus transferring energy from the motor that drives the pump to the fluid being pumped.

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