OUMAL Refrigeration Machinery Co.,Ltd. specializes in the research and development, as well as the sales, of chillers, mold temperature controllers, cooling towers, water pumps, and refrigeration accessories. Our mission is to provide a high-quality and reliable product line, serving a diverse market through customer satisfaction, innovative ideas, and flexibility.
As a distinguished China chiller manufacturer, OUMAL is committed to enhancing our influence and recognition in the industry. Our focus is on delivering excellence and innovation, which has positioned us as one of the leading industrial chiller manufacturers globally.
For many years, our sales and application support team has accumulated extensive experience, enabling them to offer recommendations for a wide range of applications. OUMAL’s manufacturing facility is equipped to produce equipment with numerous options and modifications, ensuring we meet nearly any customer demand or specific application need.
Our comprehensive product range includes various types of chillers designed for different industrial applications. These chillers are built to the highest standards, ensuring efficiency, reliability, and customer satisfaction. Our dedication to quality and innovation sets us apart in the market, allowing us to provide flexible solutions tailored to our clients’ unique requirements.
OUMAL’s product development process is driven by market demand and technological advancements. This approach ensures that we stay ahead of the curve, offering state-of-the-art products that meet the evolving needs of our clients. Whether it’s standard equipment or custom solutions, OUMAL is capable of delivering products that enhance operational efficiency and performance.
By focusing on innovation and customer satisfaction, OUMAL continues to build its reputation as a top China chiller manufacturer. Our products are designed to meet the stringent demands of the global market, ensuring we remain at the forefront of the industry.
OUMAL Refrigeration Machinery Co.,Ltd. is proud to be a leader among industrial chiller manufacturers. Our unwavering commitment to quality, innovation, and customer satisfaction drives our success and growth. We invite you to experience the excellence of OUMAL products and join our expanding list of satisfied customers worldwide.
OUMAL Proud to Be a Leader Among Industrial Chiller Manufacturers
What are the advantages of using glycol in chillers?
Using glycol in chillers offers several advantages, including:
Lower Freezing Point: Glycol mixtures have a much lower freezing point than water, which prevents the coolant from freezing in the chiller system, especially in low-temperature applications. This property makes glycol ideal for environments where temperatures can drop below the freezing point of water.
Improved Heat Transfer Efficiency: Glycol enhances the heat transfer properties of the coolant, which can improve the overall efficiency of the chiller system. This results in better cooling performance and energy savings.
Corrosion Inhibition: Glycol-based coolants often contain corrosion inhibitors that protect the metal components of the chiller system from rust and corrosion. This extends the lifespan of the equipment and reduces maintenance costs.
Enhanced Fluid Stability: Glycol solutions are chemically stable and less likely to degrade over time compared to other coolants. This stability ensures consistent performance and reduces the need for frequent fluid replacement.
Wide Temperature Range: Glycol chillers can operate effectively across a wide range of temperatures, making them suitable for various industrial applications, from low-temperature cooling to high-temperature heat rejection.
Reduced Risk of Biological Growth: Glycol inhibits the growth of bacteria and algae, which can be a problem in water-only systems. This reduces the need for biocides and other chemical treatments, lowering maintenance costs and complexity.
Non-Flammability: Most glycol solutions are non-flammable, making them safer to use in environments where flammable coolants might pose a risk.
Compatibility with Various Systems: Glycol is compatible with a wide range of materials commonly used in chiller systems, including metals and plastics, reducing the risk of material degradation or failure.
Lower Viscosity at Low Temperatures: Glycol solutions maintain lower viscosity at low temperatures compared to pure water, which helps in maintaining fluid flow and reducing the load on pumps and other components.
Environmental and Safety Considerations: Propylene glycol, in particular, is less toxic and more environmentally friendly compared to ethylene glycol. This makes it a preferred choice in applications where there is a risk of coolant leakage into the environment or contact with food and beverages.
SHENZHEN OUMAL REFRIGERATION MACHINERY CO.,LTD. :
Our factory has been committed to the design and manufacture of glycol chiller system for more than 15 years.Welcome to order industrial glycol chiller system.Factory direct sale!
What is difference between centrifugal chiller and screw chillers?
Water Chillers are generally divided into the following categories: screw chillers, centrifugal chillers, water ring heat pump units, plate and tube evaporative condensing screw chillers, thermal storage air conditioners, etc.
Screw chiller and centrifugal chiller are equipment that we often encounter. Below, Oumal Refrigeration will take you to understand the difference between centrifugal chiller and screw chiller?
What is a screw chiller?
The compressor adopts a screw type, hence the name screw chiller. The refrigerant coming out of the evaporator of the unit is a gas; after adiabatic compression 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.
2. What is a centrifugal chiller?
The biggest difference from the screw chiller is that it uses a centrifugal compressor.
It is a cooling system that uses the principle of centrifugal force to remove heat from the inside of the fluid. It is composed of centrifugal refrigeration compressor, evaporator, condenser, main motor, air extraction recovery device, lubrication system, control cabinet and starting cabinet. Some of these components are assembled in a decentralized manner, but most are "assembled" units in which each component is put together. The units are divided into fully enclosed, semi-enclosed and open types.
Both centrifugal and screw chillers are types of refrigeration systems commonly used for cooling in various applications. While they serve a similar purpose, there are some key differences between the two different chillers:
Working Principle:
Centrifugal Chiller: Centrifugal chillers use a rotating impeller and centrifugal force to compress and cool the refrigerant.
Screw Chiller: Screw chillers use two rotating screws (male and female) to compress and cool the refrigerant.
Capacity:
Centrifugal Chiller: Centrifugal chillers are typically available in larger capacities, ranging from several hundred tons to several thousand tons of refrigeration.
Screw Chiller: Screw chillers are available in a wide range of capacities, but they are generally suitable for smaller to medium-sized applications.
Energy Efficiency:
Centrifugal Chiller: Centrifugal chillers are known for their high energy efficiency, especially at full load conditions. They are designed to provide efficient cooling for large-scale applications.
Screw Chiller: Screw chillers also offer good energy efficiency, but their efficiency may vary based on operating conditions and load levels.
Operating Characteristics:
Centrifugal Chiller: Centrifugal chillers are often used in applications with varying loads and where precise temperature control is required. They can handle load variations effectively and provide good part-load performance.
Screw Chiller: Screw chillers are suitable for applications with relatively constant loads, as they are generally more efficient at full load conditions. They are commonly used in commercial and industrial settings.
Maintenance and Service:
Centrifugal Chiller: Centrifugal chillers typically require specialized maintenance and service due to their complex design and construction.
Screw Chiller: Screw chillers are relatively easier to maintain and service compared to centrifugal chillers, primarily due to their simpler design and fewer moving parts.
It's important to note that the selection between centrifugal and screw chillers depends on various factors such as cooling requirements, capacity, energy efficiency goals, load characteristics, and budget considerations. Consulting with a professional HVAC engineer or chiller manufacturer can help determine the most suitable chiller type for specific applications.
What maintenance is required for an air-cooled chiller?
Maintenance of an air-cooled chiller is essential to ensure efficient operation, longevity, and to prevent unexpected breakdowns. The following are key maintenance tasks required for an air-cooled chiller:
1. Regular Cleaning of Condenser Coils
Frequency: Monthly or as needed
Task: Clean the condenser coils to remove dirt, debris, and buildup that can reduce heat transfer efficiency.
Method: Use compressed air, a soft brush, or a commercial coil cleaner.
2. Checking Refrigerant Levels
Frequency: Monthly
Task: Ensure refrigerant levels are within the manufacturer’s recommended range.
Method: Use gauges and other diagnostic tools to measure refrigerant pressures.
3. Inspecting Electrical Components
Frequency: Quarterly
Task: Inspect electrical connections, contactors, and wiring for signs of wear, corrosion, or damage.
Method: Tighten loose connections, replace damaged wires, and check for proper voltage and amperage.
4. Monitoring and Testing Controls
Frequency: Monthly
Task: Check the functionality of control systems, thermostats, and sensors.
Method: Verify that setpoints are accurate and that the system responds correctly to changes in temperature and load.
5. Lubricating Moving Parts
Frequency: Annually or as recommended by the manufacturer
Task: Lubricate bearings, motors, and other moving parts to reduce friction and wear.
Method: Use manufacturer-recommended lubricants and follow specified procedures.
6. Inspecting and Cleaning Air Filters
Frequency: Monthly
Task: Inspect air filters for dirt and replace or clean them as necessary.
Method: Follow the manufacturer’s recommendations for filter maintenance.
7. Checking for Refrigerant Leaks
Frequency: Quarterly
Task: Inspect the system for signs of refrigerant leaks.
Method: Use leak detection tools and repair any leaks promptly to maintain system efficiency.
8. Evaluating Compressor Performance
Frequency: Annually
Task: Check the compressor for unusual noises, vibrations, or signs of wear.
Method: Perform diagnostic tests and replace or repair components as needed.
9. Inspecting and Maintaining Fans and Blades
Frequency: Quarterly
Task: Check fan blades for damage and clean them to ensure proper airflow.
Method: Tighten loose bolts and replace damaged blades.
10. Monitoring Water Quality (if applicable)
Frequency: Monthly
Task: For systems with water-cooled components, monitor and maintain water quality to prevent scale and corrosion.
Method: Use water treatment chemicals and regularly test water quality.
11. Verifying System Pressures and Temperatures
Frequency: Monthly
Task: Check system pressures and temperatures to ensure they are within normal operating ranges.
Method: Use gauges and sensors to monitor and adjust as necessary.
12. Reviewing System Performance
Frequency: Annually
Task: Conduct a comprehensive performance review to identify inefficiencies or areas for improvement.
Method: Analyze operational data, inspect all components, and perform a full system audit.
13. Updating Maintenance Records
Frequency: Ongoing
Task: Keep detailed records of all maintenance activities, including dates, findings, and actions taken.
Method: Use a logbook or digital maintenance management system.
OUMAL REFRIGERATION MACHINERY CO.,LTD.: We have been focusing on air-cooled chiller manufacturing for many years. We are a professional air-cooled chiller supplier, providing you with high-quality air-cooled chiller products with diversified products, such as 30 tons ~ 100 tons air-cooled chiller, 400 kW air-cooled chiller, 20HP air-cooled chiller, etc. Welcome to consult!
What maintenance practices ensure the longevity of industrial air cooled chiller?
Ensuring the longevity of an industrial air cooled chiller involves a series of diligent maintenance practices designed to maintain optimal performance and prevent premature wear. Regular inspections and upkeep are critical for the efficient operation of these systems. For an air cooled screw chiller, frequent checks of key components such as the compressor, condenser coils, and evaporator are essential. The compressor should be monitored for any signs of wear or inefficiency, like unusual noises or vibrations, which could indicate potential issues. Keeping the condenser coils clean is equally important, as dirt and debris can obstruct airflow and reduce the system’s efficiency.
Maintaining proper refrigerant levels is another crucial aspect of prolonging the life of an industrial air cooled chiller. Low refrigerant levels can cause the system to overheat, potentially damaging the compressor and other components. Regular monitoring and replenishment of refrigerant help maintain the system’s efficiency and prevent breakdowns. Additionally, inspecting and replacing worn-out seals and gaskets can prevent leaks and ensure the system operates smoothly. This practice is particularly important in maintaining the effectiveness of the water chiller cooling system, which relies on precise refrigerant levels for optimal performance.
Lubrication of moving parts is vital for the longevity of an air cooled screw chiller. Regularly checking and replacing lubricants as specified by the manufacturer reduces friction and wear, thereby extending the life of components such as the compressor and fans. Ensuring all moving parts are well-lubricated prevents overheating and excessive wear, which can lead to costly repairs and downtime. Regular maintenance should also include checking the electrical connections and control systems to ensure they are functioning correctly, as faulty electrical connections can lead to system malfunctions or even complete failures.
Maintaining optimal airflow around the chiller unit is crucial. Ensuring there are no obstructions around the air intake and exhaust areas helps maintain proper airflow, essential for efficient cooling. Regularly inspecting and cleaning the air filters also ensures that the system operates at peak efficiency. This practice is particularly important for an industrial air cooled chiller, where maintaining consistent airflow directly impacts the cooling performance and energy efficiency of the system.
Water quality is another important factor in maintaining the water chiller cooling system. Regularly checking and treating the water to prevent scale build-up and corrosion can prolong the life of the chiller. Ensuring that the water treatment systems are functioning properly and that the water is free of contaminants helps to prevent damage to internal components. This maintenance practice is essential for avoiding costly repairs and ensuring the efficient operation of the chiller system.
Implementing a proactive maintenance schedule is key to ensuring the longevity of an industrial air cooled chiller. Keeping detailed records of all maintenance activities and scheduling regular service checks by qualified technicians helps identify potential issues early and address them before they escalate into major problems. By adhering to these maintenance practices, operators can significantly enhance the longevity and performance of their chillers, minimizing downtime and maximizing the return on their investment.
OUMAL Chiller is a cooling tower and chiller system manufacturer integrating R&D,manufacturing and customization.Provide professional solutions.15+ years of work experience. If you have any questions about the chiller, you can send an email to answer them for you!
Which is better screw or scroll chiller？
What is screw chiller?
A Screw chiller is an industrial chiller using a semi-hermetic screw type compressor. Including air cooled screw chiller and water cooled screw chiller. Screw chiller models generally range from 30HP to 300HP or even larger. Screw chiller usually use single compressor or double or four compressors. Our Screw chillers mainly use the following brands: Hanbell, Bitzer, or Refcomp.
What is scroll chiller ?
A scroll chiller is an industrial chiller using hermetic scroll type compressor. Also the sroll chillers including air cooled scroll chillers and water cooled scroll chillers. Scroll chiller models usually range from 3HP to 100HP. The Scroll types compressors brands we use are: Copeland, Danfoss, Daikin, Panasonic. Compressors qty optional.
Both screw and scroll chillers have their advantages are suitable for different applications. Here are some key differences between the two:
Design: A screw chiller uses a rotary screw compressor, while a scroll chiller uses scroll compressors. The screw compressor is typically more robust and suitable for larger capacity applications, while the scroll compressor is more compact and suitable for smaller to medium-sized applications.
Efficiency: Screw chillers generally have higher efficiency compared to scroll chillers, especially at higher loads. They can provide better part-load performance and energy savings.
Noise: Scroll chillers are known for their low noise operation, making them suitable for noise-sensitive environments. Screw chillers may produce higher noise levels, although noise reduction measures can be implemented.
Capacity: Screw chillers are available in larger capacity ranges, making them suitable for industrial applications with higher cooling demands. Scroll chillers are generally used for smaller to medium-sized applications.
Reliability: Both screw and scroll chillers are reliable, but the simplicity of scroll chiller design often results in fewer moving parts and potentially higher reliability.
So when you don’t know how to chose a right chiller for your water cooling system.It is important to consider the specific requirements of your application, such as cooling capacity, efficiency, noise level, and cost, when choosing between screw and scroll chillers. Consulting with a qualified HVAC professional can help determine the most suitable option for your specific needs. You can contact us for further information and we will offer you best solution for your industrial chiller systems. Email: oumal@oumal.com. Whatsapp: 0086 15112554736.
Working Principle and Advantages of Screw Chillers
Like all chiller systems, a water cooled screw chiller consists of an evaporator, expansion valve, refrigerant, internal piping and controls. The main difference between screw chillers is their compressor. Screw chillers use two helical rotors to drive and compress the refrigerant gas. This type of chiller has nearly constant flow performance and is powered by an electric motor, steam or gas turbine. They are available in capacities ranging from 25 to 800 tons and are very effective when used with liquids with high evaporative temperatures.
Screw or helical compressors in screw chillers consist of two matched helical groove rotors: convex baffle and groove. They are mounted in a fixed housing and move simultaneously. As they rotate, the refrigerant gas is compressed and converted to vapor by the direct volume reduction between the two rotors.
These compressors are equipped with sliders that adjust the length of the compression path. Intake, compression and discharge take place in a linear direction. An oil lubricant on the rotor also acts as a sealant. The motor is cooled as the refrigerant flows through the holes in the screw, which acts as a liquid separator. It is important that the screw chillers are properly sized.
When they are too large, they have a long reverse cycle time and will shut down if cooling is not needed. This can also happen if the motor is running at unnecessarily high speeds or if it is driven in an open circuit. However, when properly configured, motorized chillers are reliable, efficient liquid chillers for the entire range of industrial and air conditioning applications.
This series of water cooled screw compressor chiller adopts European high-efficiency screw compressors, which have their own advantages: high energy efficiency, low noise, high reliability, small footprint, easy installation, simple operation and high flexibility. They are widely used in surface engineering, medicine, chemical, metallurgy, leather, laser, electronics, injection molding, printing and other industries. There are too many models of this series of chiller. It can realize the perfect match for industrial applications.
Advantages and disadvantages of piston chillers - Oumalchiller.com
Advantages and disadvantages of piston chillers
According to the different types of chiller compressors, industrial chillers can be divided into fully enclosed scroll chillers, semi-enclosed piston chillers, and semi-enclosed screw chillers. All kinds of compressors have their advantages and disadvantages. Today, Omar Refrigeration will take you to talk about the advantages and disadvantages of piston chillers.
Piston chiller is a chiller with semi-hermetic piston compressor as the main engine. The unit is composed of refrigeration compressors, condensers, evaporators, thermal expansion valves, etc., and is equipped with automatic energy regulation and automatic safety protection devices. The piston compressor device system is relatively simple, and this type of compressor is generally used more in low temperature conditions. For general piston compressors, the brands we use are Bitzer Semi-hermetic Piston compressor, Copeland Semi-hermetic Piston compressor, or Dorin semi-hermetic Piston compressor.
Advantages of piston chillers:
1. Wide range of applicable pressures; strong maintainability.
2. Using multi-head, high-speed multi-cylinder, the performance can be improved.
3. The material is simple, the general metal material can be used, the processing is easy, and the cost is lower than that of the screw chiller.
Determination of piston chiller:
1. There are many parts and wearing parts.
2. The compression ratio is low, the cooling capacity of a single machine is small, and the cylinder unloading adjustment cannot be adjusted steplessly.
3. It has a reciprocating motion up and down, and the vibration is large, and the weight index per unit cooling capacity is large.
4. It is very sensitive to liquid shock.
Common functions and characteristics of electroplating chillers
The effect of temperature on electroplating production is very important. If the temperature of the electroplating process is not well controlled, the quality of the coating on the surface of the electroplating products will be greatly affected. Temperature regulation and cooling, constant temperature insulation, so as to stabilize the production and efficiency of electroplating. Therefore, the surface treatment chiller, namely electroplating chiller, is commonly known as refrigerator, freezer, chiller, ice water machine, cooler, etc. So what are the characteristics of electroplating chillers?
The special chiller for electroplating generally chooses an air-cooled box-type chiller, which is easy to install and move, without a cooling tower, and is generally installed next to the electroplating equipment. The electroplating chiller uses two cooling methods, one is direct cooling and the other is indirect cooling. Due to the particularity of the electroplating industry, the electroplating solution is corrosive, so the evaporator, pipeline, water tank, Water pumps are all made of anti-corrosion stainless steel, and heat exchangers are generally made of titanium tubes to meet the needs of long-term stable use. It helps to stabilize the metal ions, make the metal ions quickly attach to the electroplated parts, continuously increase the density and smoothness, reduce the number of electroplating, and improve the productivity.
Oumalchiller specializes in industrial cooling systems, providing customized industrial cold water system solutions, providing various industrial chillers, plastic industry chillers, electroplating industry chillers, pharmaceutical industry chillers, food industry chillers, surface treatment chillers, welcome to consult .
Harm and causes of industrial chiller caused by high discharge temperature of compressor
The exhaust temperature of the compressor is the temperature of the exhaust gas after the compressor does work (compresses the gaseous refrigerant). It is usually fixed within a range. By observing the temperature change, the working condition of the compressor can be predicted and the occurrence of safety-threatening events can be prevented. . The exhaust temperature is an important parameter in the operation of the refrigeration compressor of the industrial chiller, and it must be strictly controlled. If the exhaust temperature is too high, it will cause the special refrigeration compressor of the industrial chiller to overheat, especially for the piston of the piston chiller. Refrigeration compressors have a serious impact, and the main hazards are shown in the following aspects.
1. Excessive exhaust temperature of the compressor will directly reduce the gas transmission coefficient, increase the shaft power, and reduce the viscosity of the lubricating oil, which will cause abnormal wear on the bearings, cylinders, and piston rings, and even cause burning of bearing bushes and cylinders.
2. Once the exhaust temperature of the compressor is too high, it will directly lead to thermal decomposition of lubricating oil and refrigerant under metal catalysis, and generate acid substances, free carbon and moisture that are harmful to the compressor. Free carbon is deposited on the exhaust valve, which not only destroys its tightness, but also increases the flow resistance. If the carbon residue of the pineapple is taken out of the compressor, it will block the capillary and the dryer. Acids will corrode various components of the chiller refrigeration system and electrical insulating materials, and moisture will block capillaries.
3. The chiller operator should check the overheating of the compressor. If the overheating is serious, the piston will be over-expanded and stuck in the cylinder, and it will also cause the built-in motor of the hermetic compressor to burn out.
4. The high discharge temperature of the compressor will directly affect her service life, because the chemical reaction speed will increase with the increase of temperature. Generally, the temperature of the electrical insulating material will rise by 10℃. Then her service life will be reduced by half , which is particularly important for hermetic compressors.
Causes of overheating of compressor discharge temperature:
1. The refrigeration system is short of oil
Insufficient supply of lubricating oil and lack of oil in the system will cause the machine head to not be properly cooled, resulting in an increase in exhaust temperature. By checking the oil level of the lubricating oil, it can be judged whether the lubricating oil is sufficient, and an appropriate amount of lubricating oil should be added according to the equipment regulations. If the oil separator is damaged, replace it.
2. The temperature control valve fails to work
The function of the temperature control valve is to automatically control the opening and closing of the valve according to the oil temperature. If there is a fault, the lubricating oil is directly sprayed into the machine head without passing through the condenser, which will cause the exhaust temperature to rise. The solution is to check and repair and replace the thermostatic valve.
3. The quality of lubricating oil deteriorates
Deteriorated lubricating oil will cause the oil film of the screw compressor to become thinner and not form a sufficient lubricating oil film, resulting in abnormal operation of the compressor, abnormal noise, etc. The solution is to replace the oil with new oil.
4. The cooling system is blocked and the heat dissipation is poor
Blockage or poor heat dissipation of the cooling system will cause internal scaling, resulting in poor heat dissipation, resulting in the inability of exhaust heat to dissipate, resulting in high temperature; similarly, damage to the cooling fan will also cause the cooling system to fail to dissipate heat in time.
The solution is to check the cooling system, remove dirt or repair the exhaust fan.
5. Detect control pipeline failure
This is caused by blockage of the air filter, failure of the temperature detection system, abnormal operation of the unloading valve, etc.
The solutions are: cleaning or replacing the air filter; checking whether the increase in the unit load causes over-temperature; checking the working condition of the unloading valve and adjusting it; testing, repairing, and replacing the system temperature detection system circuit.