WENZHOU DMG MACHINERY Co., Ltd : You Professional Screw Compressor Water Chiller Manufacturer

WENZHOU DMG MACHINERY Co., Ltd manily manufacture and export refrigeration equipment and air compressor with good reputation, Our customers are located all over the world including China, Southeast Asia, Middle East, USA, Europe as well as Africa and South America.Our chillers and air compressor are widely used in field of plastic, electroplating, leather, medicine, chemical, shoes, printing, fungus mushroom production environment project, agricultural cultivation, etc.

Rich Product Variety
Our company can produce Chiller, Screw Air Compressor,Cooling Tower, etc.

Wide Range of Product Uses
Our chillers and air compressor are widely used in field of plastic, electroplating, leather, medicine, chemical, shoes, printing, fungus mushroom production environment project, agricultural cultivation, etc.

Quality Guaranteed
One of more than 10 years profession supplier of refrigeration equipment and air compressor, Our products are widely used in different industries,perfect performance especially for plestic PET bottles. We have advanced management experience,design,raw materials purchase, production flow and quality control to provide customers with guaranteed high-quality products.

Leading Service
We have many years of industry experience and a complete production management, quality supervision, sales service operation system. Whether you want to buy a Low Temperature Chiller or a Silent Air Compressor, just send your requirements by email and we can customize the product for you.

Fully Enclosed Industrial Water Chiller

A Fully Enclosed Industrial Water Chiller is a cooling system designed to regulate the temperature of industrial equipment and processes. It features a sealed design, protecting internal components from contaminants and moisture, enhancing efficiency, reliability, and longevity in demanding environments.

Air Cooled Chiller 5 Ton Chiller

An Air Cooled 5 Ton Chiller is a cooling system that uses ambient air to dissipate heat, providing 5 tons of cooling capacity. It's commonly used in commercial and industrial settings to regulate equipment or process temperatures, offering energy efficiency and easy installation without water requirements.

Special Chiller Pet Blowing Bottle Machine

Air cooled water cooling machine can be installed easily and it's unnecessary to be used without cooling tower, There are various specification of machines avaible and cooling range varies from 7250 to 245000 kilocalorie(3HP-100HP),the unit is designed with multiple safety protetion to ensure safe operation

Special Extruder Air Cooled Chiller

A Special Extruder Air Cooled Chiller is designed to cool extruder machinery by dissipating heat using ambient air. It ensures precise temperature control for continuous plastic or rubber extrusion processes, improving product quality and preventing overheating without the need for water cooling systems.

Air-cooled Screw Chiller Liquid Chiller

Air Cooled Glycol Chiller

Famous brand new compressors,built-in security protection,low noise,power and durability, to increase the service life of equipment.

Air Cooled Industrial Water Chiller

Food Grade Chiller

Food grade chiller for dairy and food processing operations,for producing safe and high quality, pump,evaporator should be stainless steel,pipe should be food grade PPR.

Industrial Chiller System

This kind of Industrial Chiller System has a compact structure and can be installed easily, and it is unnecessary to be used with cooling tower. There are various specifications of machines available for customers.

What is Screw Compressor Water Chiller

A Screw Compressor Water Chiller is a device that cools water by passing it through a spiral pipe or screw-like tube in which the water is turned into ice crystals by the motion of the screw. The capacity range of a Screw Compressor Water Chiller is dependent on the power input and flow rate. As with all chiller systems, Screw Compressor Water Chillers consist of an evaporator, expansion valve, refrigerant, internal piping and controls.

Features of Screw Compressor Water Chiller

Easy to operate
The compression ratio of this screw compressor water chiller boasts a high EER value, reaching up to 20. It offers easy regulation, enabling high efficiency during partial loads and significant power savings. Operation is straightforward, with minimal maintenance requirements.

Durable
This screw compressor water chiller features a simple structure with fewer moving parts compared to conventional models, reducing the failure rate to just 1/10 of that of piston-type chillers. Its durability and long lifespan are enhanced by the stable circumferential motion, and it operates without surge phenomena even at low loads. Its compact size and lightweight design allow it to be configured as a vertical, fully enclosed large-capacity unit.

Quality assurance
Additionally, the chiller operates under positive pressure, eliminating issues with external gas intrusion and corrosion. It is equipped with a microcomputer control system that includes robust safety protections. The main refrigeration components are sourced from renowned domestic and international brands, ensuring superior performance and reliable operation.

How Screw Compressor Water Chiller Works

Screw Compressor Water Chillers are complex machines that provide cooling by circulating a refrigerant through a closed-loop system. The primary components of a water-cooled screw chiller include compressors, condensers, evaporators, and a refrigerant circulation system. Let's break down the operation of a Screw Compressor Water Chiller into several key steps:

01/

Compression
The process begins with the compressor. Screw Compressor Water Chillers typically use twin screw compressors that are highly efficient and reliable. These compressors are designed to raise the pressure and temperature of the refrigerant vapor.

02/

High-Pressure Gas
As the refrigerant is compressed, it becomes a high-pressure, high-temperature gas. This gas is then sent to the condenser unit.

03/

Condensation
In the condenser, the hot, high-pressure refrigerant gas is cooled down and condensed into a high-pressure liquid. This is achieved by circulating cooling water or air over the condenser coils. Heat from the refrigerant is released into the surroundings as the gas changes phase from a vapor to a liquid.

04/

Expansion Valve
The high-pressure liquid refrigerant then passes through an expansion valve. The expansion valve reduces the pressure and temperature of the refrigerant, turning it into a low-pressure, low-temperature liquid-vapor mixture. This sudden expansion causes the refrigerant to cool significantly.

05/

Evaporation
The low-pressure refrigerant is now sent to the evaporator. In the evaporator, it absorbs heat from the water or air that needs to be cooled. As the refrigerant evaporates, it changes from a liquid to a vapor. This phase change is what removes heat from the environment, whether it's a building or an industrial process.

06/

Vapor Return
The refrigerant, now in a vapor state, is returned to the compressor to begin the cycle again. This continuous circulation of the refrigerant allows the chiller to maintain the desired cooling effect.

Frequently Asked Questions

Q: What is the purpose of Screw Compressor Water Chiller?

A: Screw chillers have a wide range of applicability in the industrial field and are widely used in plastics (injection molding, extrusion), plastic packaging, automobile manufacturing, electronic manufacturing, electroplating, pharmaceuticals, chemicals, ultrasonic cooling, printing and other industries to maintain a stable operating temperature for equipment and processes, thereby improving production efficiency. Water-cooled screw chillers are usually suitable for large-scale cooling needs in production and processing equipment, and are widely used in industries such as plastic processing (injection molding, extrusion), meeting various process cooling needs, and greatly improving the production efficiency and product quality of plastic molding machines.

Q: What is a screw type compressor in a chiller?

A: Screw compressors are used for both water cooled and air cooled chillers. With water cooled type the compressor is on top of the chiller and with air cooled type the compressors is under the chiller. Indoor water cooled chillers will often be insulated whereas air cooled may not be.

Q: Which is better centrifugal or screw compressor 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: Which is better screw or scroll chiller?

A: In these industries, compressor systems are required to run continuously for several hours, which is why the screw compressor is the perfect fit, as it tends to support continuous usage without getting overheated. On the contrary, a scroll compressor is an ideal choice for indoor settings where loud noise is a problem.

Q: Why is a screw compressor better?

A: Screw compressors use a shaft rotation, which means that all movement contributes to the compression of air. This is more efficient, producing pressure at a reduced cost. Other advantages include: Noise Levels: Due to the smooth movement of the rotating shaft, screw compressors produce much less noise.

Q: How is a screw compressor different from a normal compressor?

A: Screw compressors use two meshing helical screws, while piston air compressors use pistons driven by a crankshaft. Another difference is the moving parts as the screw compressor has two moving parts which are not in contact while the piston compressor has a lot of moving parts.

Q: What refrigerant is used in screw chillers?

A: Environmentally friendly 134a refrigerant is used to improve unit operating efficiency. The unit is equipped with multiple protections to make the unit safe and reliable.

Q: Which compressor is best for chiller?

A: Recommendations: Chillers use one of four types of compressor: reciprocating, scroll, screw, and centrifugal. The choice leans towards reciprocating compressors for peak loads up to 80 to 100 tons. Between 100 and 200 tons peak cooling load, two or more reciprocating compressor chillers can be used.

Q: What is the life expectancy of a screw chiller?

A: Properly maintained screw chillers can have a performance life of 15-20 years. 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: What is the main function of screw compressor?

A: The screw compressor traps air between two meshed rotors, the air volume is then reduced as it moves through the rotors. The reduction in volume results in compressed air which is then used for a variety of applications.

Q: What is the maximum capacity of a screw chiller?

A: Screw chillers are available with capacity ranging from 30 to 800 tons. Screw chillers typically maintain design efficiency (kW/ton) at partial loads. The screw compressor can vary capacity in response to changing load, from 20 percent to 100 percent of capacity.

Q: What are the failures of screw compressors?

A: 1.motor overload:
Three filters (air intake filters, oil filters, oil separator) severe blockage; minimum pressure valve seal failure, resulting in a load when the motor starts encounter; when starting, vent valve is not open, the intake valve is not closed.
2.high temperature:
Common failures of screw compressors Oil filter clogged, thermostatic valve spool jams, intemal or extemal oil cooler is seriously polluted. Oil filter and oil cooler mounted thermostatic valve upstream of the oil is an effective way to avoid failure, but most brands of screw air compressors's oil filter only be protected for air end.Thermostatic valve is mixed by cold oil with hot oil.
In any part of the heat will allow the temperature of the refrigeration oil mixed with the oil. so areatly reducing the efficiency of the cooling system. Fan thermostat higher than with a start-stop reliability and efficiency thermostatic temperature control system.
3.gas-guzzling:
Return pipe clogged oil core rupture, low exhaust pressure for a long time. First, check the occurrence of gas-guzzling tank pressure is stable in the vicinity of ratings; Second, check the return pipe temperature is normal, low temperature shows the oil return orifice blockage, is off the main pollutants from the oil tank on the oxide.

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