How to choose a screw chiller correctly

2025-06-20

The industrial chiller machine has become one of the essential equipment for cooling in most production enterprises, and the screw chiller is a large-scale industrial refrigeration equipment. Screw chillers are divided into air-cooled screw chillers and water-cooled screw chillers. Compressors, condensers, and evaporators are important components of screw chillers. When purchasing a screw chiller machine, you must first understand the main control parameters of the screw chiller, such as refrigeration coefficient, cooling capacity, refrigerant, input power, etc. When choosing a screw chiller, we must consider the cooling capacity, the user's operating voltage, the outlet water temperature, and the condensing temperature. Use this to determine the model of the compressor, as well as the energy of the evaporator and condenser.

The actual cooling capacity of the screw chiller equipment is related to the following factors:

1. Chilled water outlet temperature and the water flow

2. Inlet water temperature, flow rate and fouling coefficient of cooling water

When choosing a screw compressor chiller, in addition to considering the cooling capacity, the installation environment should also be considered. In this way, it is determined whether to choose an air-cooled screw chiller or a water-cooled screw chiller. Under the same cooling capacity requirement, the energy efficiency ratio of the water-cooled screw chiller is higher than that of the air-cooled screw chiller. Therefore, There will be differences in the model of the compressor, which leads to the higher cost of the compressor of the air-cooled screw chiller than that of the water-cooled screw chiller, and the cost of the air-cooled condenser is also higher than that of the water-cooled shell and tube condenser. So how to determine whether to choose a water-cooled screw chiller or an air-cooled screw chiller?

From the perspective of the purchase cost of the screw chiller, the price of purchasing a water-cooled screw chiller is lower than that of an air-cooled screw chiller.

If you consider the installation environment, the air-cooled screw chiller is easy to install, without the need to install a cooling tower, and it is suitable to install the air-cooled screw chiller in places where water resources are scarce.

From the perspective of the maintenance of the screw chiller, the later maintenance cost of the water-cooled screw chiller is higher, and the technical requirements are higher. If there is no professional staff, in the process of installing and using the water-cooled screw chiller, It is easy to cause various problems in the chiller due to problems such as water flow, while the maintenance of the air-cooled screw chiller is relatively simple. Regularly clean the condenser and check the machine regularly.

Through the above analysis, do you know how to choose a suitable screw chiller? If you don't know how to choose when purchasing a screw chiller, Call us： +86 15112554736 to get the professional suggestion.

water cooled screw chiller with water tank

#industrial screw chiller #screw chiller price #screw compressor chiller

How to debug a screw chiller?

2025-06-20

An important step in the commissioning of screw chillers and scroll chillers is the charging of refrigerant. Generally, Oumal screw chillers are filled with the specified type of refrigerant before leaving the factory. After the chiller arrives at the chiller installation site, first check whether the screw chiller is damaged during transportation, check the high and low pressure gauges, and confirm whether the chiller is in good condition. If it is found that the refrigerant is insufficient or leaking, you need to find out the leak place and fix it, and then add the specified type of refrigerant according to the product instructions. For some screw chillers, the refrigerant needs to be emptied for transportation due to transportation problems. Therefore, after the machine arrives at the installation site, the refrigerant needs to be added again, and the appropriate refrigerant must be added according to the manufacturer's requirements. Before adding refrigerant, the air in the screw chiller system should be evacuated before adding refrigerant.

In the debugging process of the screw chiller, the following issues need to be paid attention to the following points: .

1. Check whether the valves in the refrigeration system are in normal opening state, especially the exhaust shut-off valve, do not close it.

2. Open the cooling valve of the condenser and the cold water valve of the evaporator, and the flow of chilled water and cooling water should meet the requirements of the manufacturer.

3. Before starting, observe whether the power supply voltage of the unit is normal.

4. Start the unit according to the installation instructions provided by the screw chiller manufacturer,

5. The safety protection installed in the refrigeration system should be used correctly, such as high and low pressure protection devices, water flow switches for chilled water and cooling water, safety valves and other components. If damaged, they should be replaced in time.

6. If an alarm occurs in the screw chiller, it should be stopped immediately for inspection. If it cannot be solved, contact the chiller manufacturer in time.

If you have purchased an Oumal screw chiller and do not know how to debug it, please contact your salesperson directly to guide the installation online.

If you have more questions of the debugging the chiller and installation the water cooled screw chiller, please email: oumal@oumal.com or contact Whatsapp: +86 15112554736.

#Air cooled screw chillers #oumal screw chiller #China Water Cooled Screw Chillers

How to judge the chilled water flow of the chiller?

2025-06-20

Generally speaking, everyone will have doubts when purchasing a chiller. I don't know how to judge the chilled water flow of the chiller? From what aspects should the water flow of the chiller be considered? Today I would like to share with you four suggestions:

1. Detection of return water temperature and outlet water temperature of the chiller (the unit needs to be in normal state):

30 minutes after starting up the unit, you can read the temperature of the inlet and outlet water when the unit is running through the parameters of the unit's control system or the inlet and outlet water thermometers of the unit's chilled water system. The difference should be ensured to be about 4-6 degrees. If the water temperature difference is too large, it means that the water flow of the water system through the plate type device is too small, which may cause the unit to fail to operate normally or be damaged.

2. Water pressure detection of the inlet and outlet pipes of the chiller unit:

Through the detection of the return water pressure and the water outlet pressure value, check the water flow rate of the chiller under the pressure difference between the inlet and outlet water in the random manual of the unit. In order to judge whether the water system is normal; and through this difference to judge which section of the water pipeline resistance value is too large, and make corresponding rectification plans and actions.

3. Detection of the suction temperature of the copper tube of the compressor (only in the cooling operation):

If the suction temperature of the compressor is detected to be lower than 0 degrees after the refrigerating chiller is turned on for 30 minutes, it means that the water flow in the water-side heat exchanger is insufficient, resulting in a drop in the evaporating temperature and evaporating pressure, and causing freon to flow in the direction of the evaporator. The suction pipe of the compressor is still evaporating and absorbing heat, which will cause the suction temperature of the compressor to be lower than 0 degrees; in addition, it is necessary to eliminate the drop of evaporating pressure and evaporating temperature caused by the low water temperature set point; The low water temperature unit can be considered normal as long as the compressor has a suction superheat of 6 to 8 °C. Therefore, under normal water flow, the suction temperature of the compressor will generally be greater than 0 °C, below this value, the problem of the water system needs to be eliminated.

4. Water pump running current detection:

By detecting the running current of the chiller water pump and comparing it with the rated current, it can be judged whether the actual water flow rate is larger or smaller than the rated water flow rate of the water pump. Only by making a comprehensive judgment with the previous parameters can an exact water system detection and analysis be obtained. Judgment report.

#chilled water flow of chiller #chiller water flow #chilled water system

How to size a chiller for spot welding machine?

2025-06-20

Spot welding machine is a kind of mechanical equipment. It adopts the principle of double-sided double-point overcurrent welding. When working, two electrodes pressurize the workpiece so that the two layers of metal form a certain contact resistance under the pressure of the two electrodes, and the welding current changes from one When the electrode flows through the other electrode, the two contact resistance points form an instant thermal fusion, and the welding current flows from the other electrode to the electrode along the two workpieces to form a loop instantly, and will not damage the internal structure of the welded workpiece. Because the resistance welding machine is in the working process, the resistance head is prone to high temperature, which affects the accuracy of the processed product, so a chiller is needed to cool it next to ensure the accuracy of the processed product. The spot welding machine is equipped with a chiller, which can improve the safety and stability of the welding work and extend the life of the welding machine.

Industrial chillers used for spot welding operate like recirculating coolers as they use the same closed-loop setups. However, process chillers can be modified to handle industrial cooling on a larger scale. Industrial chillers also have condensers, evaporators, and automated temperature controls that make them more efficient. Air cooled chiller is a good choice for spot welding machine, It’s easy to installation and move.

A general rule for sizing a chiller is that, for every 100KVA of welder, you should have about a 1-ton chiller. For example, if you want to cool 4 welders that are 100KVA each, you will need a 4-ton chiller. If you want to cool a 300KVA machine, you will need a 3-ton chiller. See below for further sizing details.

To calculate for resistance welding:

BTU/hr = (welder KVA) x (duty cycle) x (0.85) x (0.6) x 3415 BTU/hr

To calculate for resistance welding:

BTU/hr = (welder KVA) x (duty cycle) x (Eff power supply) x (Eff heat collection) x 3415

Eff. power supply = the percentage of output to input power

Eff. heat collection = the percentage of heat absorbed by chilling water (varies by approximately 50-70%)

Duty cycle = weld time on/ time elapsed

As a leading industrial chiller manufacturer, OUMAL CHILLER is dedicated to supplying high-quality process chillers for a wide range of industries. Our knowledgeable staff will help you find the industrial chiller best suited to your unique process application. Contact us to choose the spot welding cooling system for your spot welding machines. The air cooled chiller is your good choice for Industrial welding chillers.

#spot welding chiller #welder cooling water system #chiller for spot welding machine

How to use the chiller simply and correctly？

2025-06-20

Industrial Chillers are widely used, providing cooling water systems for industrial production and helping companies improve product output and quality. Therefore, we need to understand how to use chillers simply and correctly to avoid problems during use and delay production. Let us briefly understand the use of chillers from the following aspects.

One: the protection of the chiller:

1. Check whether the voltage is normal, lack of phase,

2. Check and record the running current.

3. Measure and record whether the high and low pressure and temperature control temperature are normal.

4. Under normal conditions, the high pressure is 1.5MPa / the low pressure is 0.45MPa4 Check whether the interlocking control circuit device is loose and aging.

5. Check whether the oil level and oil temperature are normal.

6. Check the compressor for abnormal sound and abnormal vibration.

7. Refrigerant system test.

8. Overall commissioning and testing.

9. Regularly check whether the quality of the chilled water and cooling water is normal. When the water quality of the water source becomes dirty or degenerated, please replace the water source in time.

Two: The annual maintenance of the chiller is as follows:

1. Clean the condenser (every six months of cumulative operation)

2. Cleaning the cooling tower (the water-cooled chiller should be cleaned once every three months after accumulative operation)

3. Check the refrigeration oil and lubricating oil system, and replace and supplement the industrial chiller if necessary.

4. Check the circuit system of the water chiller system.

5. Compressor motor coil insulation test for industrial chillers.

6. Check whether the filter drier is normal or not, and replace it if necessary.

Three: the precise use of chillers knowledge:

7. Check the amount of refrigerant and replenish refrigerant in time.

8. Check and correct the high and low pressure switches.

9. Check and calibrate the thermostat.

10. Test run and general calibration, test whether the superheat is normal and whether there is abnormal sound of each component.

Generally, water cooling (that is, natural water and water tower cooling methods) cannot achieve high precision and high efficiency.

screw air chiller

The purpose of temperature control, because natural water and cooling tower heat dissipation are inevitably affected by natural air temperature, the water temperature in winter is low in summer, and the water temperature is high in summer. If the air temperature is 30°C, it is almost impossible for the water temperature to reach 10°C, so it is extremely unstable to control in this way. The water chiller is completely different from the general water cooling equipment, because the chiller has a completely independent refrigeration system, which will never be affected by the temperature and the environment. The purpose of high-efficiency temperature control. The chiller is equipped with an independent water circulation system, and the water in the chiller is recycled, which can save a lot of water. Therefore, industrial production is inseparable from industrial chillers. Oumal specializes in the production of industrial chillers to help companies provide industrial chilled water system solutions. Contact us if you are looking for a solution for your industrial chilled water system.

#cooling water system #chilled water system #industrial chiller

Interpretation of compressors, condensers, evaporators, and microcomputer control systems of screw chillers

2025-06-20

There are many parts of the screw chiller, among which there are several major components, namely the compressor, condenser, evaporator and microcomputer control system of the screw chiller. The operation panel and computer control system of the screw chiller are very important. Therefore, the four parts of compressor, condenser, evaporator and microcomputer control system are the core parts of screw chiller. Let us discuss these four components in detail.

1. Compressor

As the name suggests, the screw chiller uses a semi-hermetic screw compressor as the compressor of the chiller. There are several major brands of screw compressors we use, such as Hanbell compressors from Taiwan, Bitzer compressors from Germany, or Fusheng compressors from Taiwan. These compressors have reliable quality, low failure rate and high energy efficiency ratio. In contrast to screw chillers, there are scroll chillers and piston chillers. The main brands are Copeland, Danfoss, Bitzer, etc. We won't talk about them here.

2. Condenser

There are two types of condensers for screw chillers. The condenser of the air-cooled screw chiller is a fin type with an additional fan for heat dissipation, while the condenser of the water-cooled screw chiller is a shell and tube type. Therefore, the water-cooled screw chiller The chiller requires an external cooling tower to dissipate heat. Of course, whether it is a water-cooled screw chiller or an air-cooled screw chiller, the condenser must be sufficient to ensure the cooling effect of the chiller and reduce high-voltage failures.

3. Evaporator

Evaporator mainly depends on whether its energy loss is more or less, the less cooling loss is better, and the cooling effect is better. It also depends on whether the structure is compact and the performance is stable. We use shell and tube evaporators for the evaporators of screw chillers.

4. PLC control system

The configured screw chiller, its automatic control system is very high-end, menu-type buttons, and remote monitoring and control, which is very convenient. Such screw chillers can also make you more worry-free to use, even if Operators who don't know anything can use it normally with a little training, which is very user-friendly. Omar screw chiller adopts Siemens PLC control system, or PUNP LCD Touch Screen Control Panel. Omron is optional for client.

To learn more about OUMAL Screw Chiller, please contact us to get the detail information.

#screw chillers #screw chller compressor #screw chiller PLC controllers

Precautions for installing industrial chillers

2025-06-20

With the continuous improvement of domestic industrial production capacity, industrial chillers are more and more favored by enterprises. However, during the installation process of industrial chillers, some installation problems are often encountered. So how do we properly install an industrial chiller?

water cooled screw chiller

1. After unpacking the new machine, first check the accessories in the box according to the list, so as to avoid the failure of normal installation of the chiller due to the lack of accessories. After confirmation, follow the installation drawings and installation sequence provided by the chiller manufacturer. The water-cooled chiller needs to be installed with a cooling water system. After the cooling tower pipeline is installed, ensure that the water circulation is normal.

2. Please ensure that the working voltage of the chiller is stable and normal. Make sure the power socket is in good contact and the ground wire is grounded reliably. It is necessary to pay attention to whether the power cord socket of the chiller is connected well and the voltage is stable. The normal working voltage of Omar standard chiller is 3ph-380V-50Hz. If it is indeed a special working voltage range, it can be customized separately. If the power frequency does not match, the machine will be damaged. Please use the 50Hz or 60Hz model according to the actual situation.

3. Check the installation environment and keep away from all kinds of flammable and explosive substances. The installation site of the unit must be the floor, installation pad or foundation, and its horizontal height should be within 6.4mm and can bear the operating weight of the unit. The unit should be placed in a computer room with a room temperature of 4.4-43.3°C, and there should be enough space around and above the unit for routine maintenance. One end of the unit should have space for the exhaust pipe for cleaning the condenser tube bundle, or a door hole or other suitable holes can be used. When the water source and the surrounding environment of the cooling water tower are harsh, the chilled water and cooling water circuits must be installed with Y-type filters and cleaned regularly. The highest part of the closed chilled water system must be installed with an automatic exhaust valve, and the lowest part of the system must be installed with a drain joint for the system to use. If it is an air-cooled chiller, it is necessary to ensure good ventilation and heat dissipation around the chiller fan port. Please ensure that the air inlet and outlet passages of the chiller are smooth, the air outlet above the chiller should be at least 50cm away from the obstacle, and the air inlet on the side should be at least 30cm away from the obstacle.

4. It is strictly forbidden to run without water. The water storage tank will be emptied before the new machine is packed. Please ensure that the water tank is filled with water and then turned on, otherwise the water pump will be easily damaged. The water-cooled chiller must ensure that the cooling water system circulates well.

Omar will provide guidance before the customer installs the chiller. If the customer does not know how to install the chiller after receiving the chiller, please contact our chiller sales and we will provide professional help. Email : oumal@oumal.com

#water cooled chiller installation #industrial chiller installation #air cooled chiller installation

The difference between direct cooling and indirect cooling of industrial chillers

2025-06-20

The industrial chiller is a refrigeration equipment that can provide industrial cooling water. Industrial chiller is used in a wide range of industries, such as: electroplating, plastics, electronics, food, card making, chemical industry, machining, laser and other industries. There are two cooling methods for the chiller, one is direct contact between water and the material to be cooled, and the other is indirect contact. In the industrial production process, in order to cool the production medium, in order to ensure that the production equipment works at a normal temperature, to absorb or transfer the excess heat of the production medium or production equipment, cooling water is used. The cooling water and the cooled medium are separated by the heat exchanger wall or equipment, which is called indirect cooling water.

Direct cooling water refers to the cooling water that is in direct contact with the product or semi-finished product for cooling in order to meet the needs of the process during the production process, which is called direct cooling water. It includes direct-flow spray water for temperature and humidity regulation.

When the chiller is working, its freezing method can be selected according to customer needs, direct cooling and indirect cooling.

direct cooling water system-air cooled screw chiller

There are also various cooling media. According to different cooling liquids, some liquids that need to be cooled cannot contact the cooling water or cooling medium in the chiller, such as electroplating liquids with strong corrosiveness, such as the food industry, especially milk cooling, is the evaporator that cannot touch the chiller. Therefore, the chiller needs to indirectly cool the milk and the electroplating liquid. A detachable plate heat exchanger is added between the chiller and the liquid to be cooled. One side takes the chilled water, and the other side takes the milk or electroplating liquid, so that the milk can be cooled. No pollution, and the plating solution will not corrode the evaporator of the chiller. There are also many indirect cooling methods in the electroplating industry, such as laying titanium tubes in the oxidation tank, and the chilled water takes away the heat of the electroplating solution through the titanium tubes to achieve the purpose of cooling. made), while the chilled water is taken, the plating solution is taken.

The direct cooling method is most used, and there is no requirement for water quality. The chilled water is directly connected to the equipment that needs to be cooled for cooling. The effect of direct cooling is better than that of indirect cooling.

Oumal specializes in the production of various industrial chillers, matching materials and customizing professional industrial cooling water systems according to the needs of customers for direct cooling and indirect cooling. Buy an industrial chiller, Call us to get the latest price.

#indirect cooling of industrial chillers #direct cooling of industrial chillers #industrial cooling water systems

The lubrication method of the internal components of the screw chiller

2025-06-20

Screw compressor chillers can be divided into air-cooled screw chillers and water-cooled screw chillers according to different heat dissipation methods. According to different temperatures, it can also be divided into low temperature screw chillers, and according to the protection method, there are explosion-proof screw chillers. Explosion-proof screw chillers are mainly used in the chemical industry. The core components-compressors of these screw chillers are screw-type series of well-known brands, such as: Taiwan Hanbell screw compressor, Germany Bitzer screw compressor, the lubrication effect is very good, and the service life is over 20 years.

When the compressor lubrication system of the screw chiller is better, it can reduce the friction force, friction heat and wear of parts of the compressor, better improve the mechanical efficiency of the compressor, and increase the reliability and working life of the compressor. The compressor lubrication method of the screw chiller is divided into oil lubrication and oil-free lubrication. At present, oil lubrication is still the main method, and the dripping or splashing method is adopted, and the splashing method is the most widely used in screw compressors. a form. In this lubrication method, the air and the compressor oil are in close contact, which can play a better role in the operation of the compressor of the chiller.

So, what is the lubrication method of the refrigeration compressor of the screw chiller?

1. Splash lubrication: This method is generally used for small open or semi-hermetic compressors. It uses the crankshaft or accessories set on the crankshaft to contact the oil surface when rotating, so that the lubricating oil splashes and the friction parts are lubricated.

2. Centrifugal oil supply and lubrication: This method is generally used in fully enclosed compressors with vertical crankshaft installations. It uses the centrifugal force of the crankshaft to tell the rotation to make the lubricating oil in the center of the crankshaft move along the shaft to two directions under the action of centrifugal force. Side and upper flow to lubricate the friction parts.

3. Mechanical oil pump oil supply and lubrication: This method is generally used for medium and large compressors. It uses mechanical oil pumps (commonly there are gear pumps, rotor pumps, crescent pumps, etc.) to pump and press lubricating oil to each friction area.

The lubricating oil (that is, refrigeration oil) used in the refrigeration compressor of the screw chiller can enhance the sealing effect after filling the gap with the cylinder and the friction surface of the shaft seal, and can take away the wear debris and improve the friction surface. Working conditions, ensure the normal operation of the compressor, and improve the working efficiency of the entire chiller.

#screw compressor chillers #screw chiller compressor #Hanbell screw compressor chiller

What are the advantages of water-cooled chillers?

2025-06-20

Water-cooled chillers are equivalent to air-cooled chillers, which are safer in operation and more conducive to maintenance and repair.

The high-quality compressor is the heart of the water-cooled chiller, and the compressors are all high-quality brand compressors. For scroll compressor water cooled chiller, We use Copeland, Danfoss, Panasonic, Daikin Brand, For screw compressor water cooled chiller, Bitzer and Hanbell or Refcomp compressor is the widely used in our screw water cooled chiller systems.

The water-cooled chiller condenser is made of high-efficiency external threaded copper tube, which is very small in size and has a very fast heat dissipation speed. It uses new CAD/CAM processing technology and is completed with CNC machining center. It has compact structure, high reliability, beautiful appearance and high efficiency. Energy saving, good heat dissipation, the refrigerant pressure is lower than that of air cooling, the energy efficiency ratio is higher than that of air cooling, and the cooling speed is faster.

The water-cooled chiller is equipped with a single-chip control system, built-in compressor drier filter and expansion valve, maintenance hand valve interface and other devices to ensure the reliable and safe operation of the machine and facilitate maintenance.

The water tank evaporator has a built-in automatic water replenishment device, which saves the expansion water tank in the engineering installation and facilitates installation and maintenance. It is suitable for special occasions such as large temperature difference and small flow.

The multi-function operation panel of the water-cooled chiller is equipped with an ammeter, a control system insurance, a compressor switch button, a water pump switch button, an electronic thermostat, various safety protection fault lights, and a unit startup and running indicator light, which is easy to operate and easy to apply.

1. Stable performance: multiple compressors are used in parallel, each compressor has its own independent refrigeration circuit, that is, the evaporator and condenser are also completely independent; all compressors are commanded by a unified microcomputer control system, which is turned on and off one by one , they will never interfere with each other. In addition, the brand machines are all made of original genuine products, and the single machine failure rate is extremely low. Based on the above reasons, this series of machines can be guaranteed to have a highly stable performance. Ideal equipment without the need to purchase additional spares.

2. Power saving and energy saving: multiple small and medium power compressors are used in parallel, the starting current is stable, and the interference to the power grid is very small when turning on and off. With the change of load, the unit will automatically determine the number of startups to ensure the compressors that are turned on. In a better working state, thereby effectively saving energy.

3. Long service life: The evaporator and condenser are very reasonably designed and placed above the compressor. During the entire operation process, most of the oil stays in the compressor to ensure good lubrication of the compressor.

4. Wide range of application: plastic products, molds, hardware, electroplating, chemical industry, electronics, food preservation, laser engraving, vacuum coating, ultrasonic cleaning; high-power chillers are widely used in hotels, office buildings for air conditioning, plastic cooling, food preservation , bath heating and cooling, medical storage and other industries.

5. Ergonomic panel, fully automatic control, equipped with precision electric temperature controller, can run smoothly for a long time.

6. The high-efficiency heat transfer heat exchanger is adopted, which has the advantages of less cooling loss, easy oil return, and no freeze cracking of the heat transfer tube.

7. High-performance compressors imported from Europe, Japan and the United States are used, with high EER value, low noise, and stable operation. 8. Using Schneider Electric, it is safe, stable and reliable in operation.

#water cooled chiller advantages #screw type water cooled chiller #packaged water cooled chiller