Both air-cooled screw chillers and water-cooled screw chillers use semi-hermetic screw compressors, and screw compressors have a high energy efficiency ratio. At present, the compressors of screw-type industrial chillers mostly use compressor brands such as Hanbell Bitzer, Fusheng, and Refcomp and other compressor brands. The main difference between the air-cooled screw chiller and the water-cooled screw chiller is the form of heat dissipation. The air-cooled screw chiller uses a fan to dissipate heat, uses air as the cooling medium, and dissipates heat through the air through a fin condenser and a low-noise fan. To cool the refrigerant, the water-cooled chiller uses water as the cooling medium, and then the cooling water cools the refrigerant.

Secondly, the installation of the air-cooled screw chiller is simple and does not require a cooling tower. Because the screw chiller machine is relatively large, an external water tank is used. The air-cooled screw chiller is greatly affected by the ambient temperature, especially in some areas with high ambient temperature, which will cause poor cooling effect and may cause a high-pressure alarm due to excessive temperature. As the air-cooled screw chiller’s water quality requirements are small, so we recommend installing an air-cooled screw chiller where the water quality is not good. The water-cooled screw chiller is not affected by the environment, and the cooling effect is better than the air-cooled screw chiller. In the case of the same cooling capacity, due to the lower condensing temperature of the water-cooled screw chiller, higher cooling effect, lower power and lower power consumption, the operating cost of the water-cooled screw chiller is lower than that of the air-cooled screw chiller machine.

Therefore, when purchasing a screw chiller, whether to choose an air-cooled screw chiller or a water-cooled screw chiller requires us to consider the environment, installation, and cost. If you are still hesitating about how to choose a chiller, contact us and a professional refrigeration engineer will give you advice. Email: oumal@oumal.com.

In the process of using the chiller, have you encountered the problem that the chilled water of the chiller does not circulate? How to solve the problem of the chilled water not circulating?

We all know that under normal circumstances, small industrial chillers have been equipped with chilled water circulation pumps, such as Packaged air-cooled chillers, box-type water-cooled chillers, and large capacity chillers such as screw chillers and open-type water chillers. The chiller does not contain a chilled water circulating pump. At this time, when installing the cooling water system, an external chilled water circulation pump must be installed, so that the cooling water returns to the chiller for cooling after absorbing the heat of the cooling equipment, so that the cooling water supply pipe forms a circulation system.

It should be noted that no matter whether the chilled water pump is inside the built-in chiller case or outside the chiller, it is recommended that the location of the chilled water pump should be lower than the water level of the water tank. In this way, the circulating water pump can absorb cooling water well. However, in some cases, due to the needs or limitations of the installation environment, the chilled water pump may be higher than the water level of the water tank, so that the cooling water system cannot absorb water during operation, resulting in the chiller. In the case of insufficient chilled water flow, it cannot be started and a fault is reported. So what should we do when the chiller fault code shows insufficient chilled water flow?

1. Use a rubber tube (open its small valve) to send back the water supply pipe reserved on the large pipe on the water tank, and use a wrench to unscrew the vent plug of the cold water circulation pump (if there is water before tightening), until the water is removed. Return to the large tube in the tank and pull the hose out to see if any air bubbles come out. If it does, keep pouring water into the tank until the return water returns to the large pipe in the tank, then unplug the hose and see if any air bubbles come out. If yes, keep pouring water. Close the small valve until there are no air bubbles.

2. At this point, turn on the chiller for 1 minute. If the big pipe has a lot of water back into the pool, that's fine.

3. If the return water is not enough or there is no return water, repeat the above irrigation operation.

When you purchase and install the Oumal industrial chiller, if the chilled water flow is insufficient during the installation test, please contact our sales in time, we will arrange a professional engineer to guide you to solve the problem. Tel: +86 15112554736.

Sand mill, also known as laboratory bead mill, or nano sand mill, is mainly used for wet grinding of chemical liquid products. It is mainly composed of body, grinding cylinder, sand grinding disc (lever), grinding medium, motor and feeding pump. The speed of feeding is controlled by the feeding pump. The grinding media of this equipment are generally divided into zirconia beads, glass beads, zirconium silicate beads, etc.

Since the sand mill (bead mill) is working, the material and the grinding medium will have strong collision and friction, which will generate a lot of heat energy, and the grinding inside of the sand mill should generally not exceed 65 degrees. The machine protection temperature will cause the temperature switch to act, and the sand mill will automatically stop for protection, thus affecting the production efficiency. Inversely, if the internal temperature of the grinding is too low, the viscosity of the grinding slurry will be too high, the action motor cannot be driven, and the grinding motor may be burned. It can be seen that the sand mill must match the cooling system.

The functions of the Oumal sand mill chiller system in the sand grinding process are as follows:

1. Effective control of slurry dehydration. Most of the energy consumed by grinding is converted into heat energy, which increases the temperature of the air and material. For ball mills, the high temperature inside the grinding chamber will lead to dehydration of the slurry, which will adversely affect the setting time and strength of the slurry. Oumal sand grinding cooling system can avoid this phenomenon.

2. During the sanding process, the surface of the slurry absorbs a part of the air to form an air film, which hinders the electrostatic interaction between the particles and avoids the adsorption and condensation on the surface of the particles. However, when the temperature exceeds 100 °C, the air film adsorbed on the surface of the particles is destroyed, and adsorption and coalescence are formed between the particles and the particles, and between the particles and the lining plate of the grinding body under the electrostatic action, which plays a buffering role in the grinding. Reduced grinding efficiency. This effect increases with the increase of the specific surface area of the product and the increase of the temperature in the mill. Therefore, water cooling system can improve the grinding efficiency.

3. When grinding cement, the material entering the grinding temperature is generally higher than the material entering the grinding temperature when grinding raw meal, and the product fineness is also relatively fine. Therefore, the temperature inside the mill is higher. If it is not cooled, the temperature of the cylinder body is too high, on the one hand, the gap between the lining plates will become smaller due to thermal expansion. In severe cases, the lining plate will be squeezed together to bulge and the lining plate screws will be broken. On the other hand, the temperature of the cylinder body will also be conducted. To the hollow shaft, the temperature of the hollow shaft is too high and equipment accidents are caused. Therefore, water chiller systems will improve the safe operation of the equipment.

Oumal Chiller specializes in the production and processing of various specifications and models of industrial chillers, which can be used for cooling and cooling of grinding equipment such as sand mills, bead mills, and grinders. downtime. The chiller is compact in structure, easy to move, high efficiency, low noise, power saving and durable. It can effectively control the temperature of the sand mill to ensure that the material temperature and material do not deteriorate. It is a kind of matching refrigeration equipment that can prevent high temperature during the operation of the sand mill equipment and keep the equipment within a certain cooling temperature range through continuous water circulation. normal operation of the sand mill.

What is Blow Molding Machine?

Blow molding machine is a kind of equipment that makes plastic particles into hollow containers through a blow molding process. At present, the more common models include: a hollow extrusion blow molding machine that uses PP and PE for one-time molding, and uses PET, PC or PP for two moldings. The injection-stretch-blowing blow molding machine and the newly developed multi-layer hollow extrusion blow and stretch blow molding. At present, most of the blow molding machines are also two-step blow molding machines, that is, the plastic needs to be made into preforms and then blown. Nowadays, environmentally friendly plastics made of PET are commonly used.

Production process of Blow molding machine

The working process of the bottle blowing machine is generally to place the preform in the preform container, automatically enter the preform positioning device through the conveying device, and then load the preform mouth upwards onto the preform holder, and then send it to the drying tunnel for heating After that, the preform is sent to the blowing platform, and then the mold is locked, followed by low-pressure blowing and high-pressure blowing. After cooling and forming, the high-pressure gas in the bottle is discharged, and finally the mold is opened. The finished bottle is taken from the blowing platform by the automatic demoulding system Come down. In the cooling molding process, the chilled water provided by the chiller is used to cool the bottle wall and prevent the mold from overheating and damage.

What is a blow molding chiller ?

Blow molding chiller is the cooling system which provide cooling water for the blow molding machine. Because the bottle blowing machine generates a lot of heat during the production process, and the ambient temperature is getting higher and higher, tap water or cooling towers can no longer cool the bottle blowing machine, resulting in a decline in product refrigeration. Therefore, the bottle blowing machine chiller Used, it can effectively improve the surface finish of plastic products, reduce the surface marks and internal stress of plastic products, make the products do not shrink or deform, reduce defective products, is suitable for demoulding of plastic products, accelerate product shaping, and shorten the injection molding cycle. Greatly improve the production efficiency of the bottle blowing machine.

How to choose a suitable chiller for the bottle blowing machine.

First determine the control temperature and cooling capacity required by yourself, such as how much water you need per minute to finalize. Generally, the water chiller is selected according to the requirements for cooling water provided by the blowing machine manufacturer. Generally, the temperature of the outlet water is 10℃, and the cooling water flow requirements of different models. Some manufacturers will directly mark the horsepower of the chiller in the parameters.

If you are looking for the industrial chiller for your bottle blow machine, You are welcomed to contact us to get the blow molding chiller price.

In many special use environments, companies need to apply water-cooled chillers. Since water-cooled chillers need the help of cooling towers during operation, they need to follow the instructions introduced by the chiller manufacturer after purchasing water-cooled chillers. Relevant experience, complete the normal operation of water-cooled chillers, and ensure high performance of water-cooled chillers.

How to choose to buy a cooling tower?

In the actual use environment, there are different types of cooling water towers. Simply distinguished from the shape, domestic cooling water towers are divided into two types: rectangular and circular. As for the specific functions, rectangular and circular cooling towers have similar functions, and there is no According to the introduction of the refrigerating machine factory manufacturer, the circular cooling tower can adapt to more use environments and achieve the purpose of improving the working efficiency of water-cooled chillers.

Determine the model and specific specifications of the cooling tower

Different water-cooled chillers need to be matched with different specifications of cooling towers. In the selection process, it is necessary to select suitable cooling tower equipment according to the specific data of the cooling water flow, and at the same time ensure that the water flow is in a more suitable state to ensure water cooling. According to the requirements of the refrigeration plant, the water flow rate of the cooling tower should not be higher than 20%. As long as it meets the specific value range, it can meet the needs of water-cooled chillers.

Specifications of cooling tower

In the process of purchasing a cooling tower, as to which specifications to choose, you need to complete the entire selection process according to actual needs, such as the specific operating power of the water-cooled chiller, and the amount of water inflow and discharge, combined with specific data to select the appropriate cooling tower product. At the same time, it should be noted that normal water-cooled chillers need to be equipped with a cooling water tower. The number of cooling water towers to be purchased needs to be determined according to the actual number of water-cooled chillers, and the principle of one-to-one purchase is realized, so as to meet the normal conditions of water-cooled chillers. Operational requirements.

For the introduction of cooling water tower selection techniques, users can realize that water-cooled chillers can meet daily production needs only when they cooperate with cooling water towers. The lack of any equipment has a great impact on cooling water towers. Therefore, choosing high-quality cooling water towers will improve The specific performance of water-cooled chillers plays a vital role.

Generally, when we choose a cooling tower, there is a commonly used formula:

Cooling water flow = host refrigeration capacity (KW) * 1.2 * 1.25 * 861/5000 (m3/h)

Cooling water volume = host condenser load (kcal/h) * 1.2/5000 (m3/h)

Cooling water volume = host condenser heat load (m3/h) * 1.2 (m3/h)

Cooling water volume = host cooling capacity (RT) * 0.8 (m3/h)

Cooling water volume = heat load of main engine evaporator (kcal/h) * 1.5 * 1.25/5000 (m3/h)

Cooling water volume = heat load of main engine evaporator (m3/h) * 1.2 * 1.25 (m3/h)

Cooling water volume = host evaporator heat load (RT) * 1.2 * 1.25 * 3024/5000 (m3/h)

Note: 1.2 above is the selection margin, 1.25 is the condenser load factor

Oumal Refrigeration has a professional technical team. We will select suitable cooling towers for customers' water-cooled chillers. If customers purchase by themselves, we will also recommend suitable cooling tower models to customers. If you need to know the price of the cooling tower, please contact our sales staff.

In a chiller cooling water system, the water pump is an indispensable component. The water pump can be installed in the chiller or outside the chiller. Generally, we install the water pump in the chiller unit for air-cooled chillers. , So that the chiller is easy to install. For a water-cooled chiller, a system requires at least two water pumps. One pump is installed in the chiller to provide chilled water for the chilled water pump and equipment that needs to be cooled, and the other is installed outside the chiller and connected to the cooling water tower to provide the condenser. Cooling water. Screw-type chillers generally do not install the water pump inside the chiller, but directly install it outside together with the external water tank. The role of the water pump is so important in the chiller, how do we choose the right water pump?

The water pump of the chiller generally adopts centrifugal type, so when choosing a water pump for the chiller, you must first determine the flow and head of the pump.

We can calculate the energy balance of the chiller as a system. The heat entering the system includes: the cooling capacity plus the motor power, the heat removed from the system, the heat carried by the cooling water and the heat dissipated in the environment, and the heat transferred to the environment is omitted. According to the process requirements (inlet water temperature and outlet water temperature), the flow of circulating water can be obtained. For example, the total maximum cooling capacity of a centrifugal chiller and a screw chiller is 2637+1231=3947KW, The motor power is: 467+256=723KW, and the total heat (cold) generated by 4670KW needs to be removed. If the cooling water passes through the cooling tower to change from 37°C to 32°C according to the design requirements, the amount of heat it brings out is The water volume should be: 4670÷1.163×1000÷(37-32)=803.1m3/h, (1.163 is the conversion coefficient between kilowatts and KCal). The flow rate of the pump that should be determined in this way can generally be considered for two pumps to operate, and one for standby. In order to facilitate the operation in the high temperature period.

The second is the pump head. It should calculate the resistance loss based on the flow rate of the water in the pipeline (determined by the size of the pipeline), the length of the pipeline, the local resistance (the condenser in the chiller (can be found in the manual), and the control parts. Cooling water is a circulating system, you don’t need to consider the height difference, just add the height difference of the cooling tower. The pipe flow rate is generally about 1m/s, you can press: (pressure drop per meter of pipe MPa/m) i= The formula is 0.0000107×V×V÷d^1.3, where V is the average flow velocity (m/s), so the pump head is also determined.

Omar’s professional industrial chillers have been produced for many years. We have professional engineers who will select professional chillers and appropriate pumps for you, customize your cooling water system according to your needs, and improve your production efficiency and products. quality.

The application of chillers is very wide, including plastic industry, chemical industry, packaging industry, printing industry, food industry, etc. Today we will talk about how to choose chillers in the food industry. The water chiller used in the food industry needs to be used for rapid cooling of all kinds of food after heating, so that it can be suitable for canning and bottling requirements. In addition, various fermented foods require different cooling temperatures to stabilize fermentation needs and improve fermented products. To ensure the quality of fermentation, it is also used in the pharmaceutical, chemical industry, and refrigeration equipment.

When choosing a chiller in the food industry, first consider the temperature of the chilled water required in the process, whether to use a medium-temperature chiller or a low-temperature chiller, and secondly, consider whether the cooling water needs to be in direct contact with the food? If it is to directly cool food, the place where the material of the chiller contacts water must be stainless steel or PVC. If it is to cool food indirectly, use an ordinary industrial chiller. In addition, add a detachable plate heat exchanger. If the temperature is lower than 5 degrees, the chiller is a low-temperature chiller, and ethylene glycol needs to be added to the cooling water. The chiller must indirectly cool the food. Another factor to consider in the chiller industry is the shell sheet metal of the chiller. Customers will require stainless steel sheet metal to make the chiller's chassis for easy cleaning. Therefore, when we select food chillers for customers, we must first understand the process flow, temperature and material requirements. The price of stainless steel chillers is slightly higher than that of ordinary chillers. So you can choose the appropriate chiller according to your needs and budget.

If you need a food processing chiller cooling system, please contact us. OUMAL Refrigeration has a professional technical team to customize your own industry chiller for your cooling water system. The price of OUMAL chiller is favorable, welcome to inquire.

The normal and safe operation of the chiller is inseparable from the refrigerant. It is the working medium that circulates in the chiller refrigeration system to achieve refrigeration. The commonly used refrigerant types for chillers are: R22, R407C, R404A, R410A, R134A, R507... Because R22 refrigerant is not environmentally friendly, most countries have now banned the use of R22. Therefore, for Omar chillers, high temperature The chiller uses R407C refrigerant, and the low-temperature chiller uses R404A. Of course, R134a, R410A, etc. can also be used according to user requirements. So, how to choose the appropriate refrigerant type for the chiller?

R22: Because R22 destroys the ozone layer, many countries have now banned the use of R22. Therefore, the chillers we export are generally R407C systems, unless customers require special requirements.

R407C: R407C is a mixture of R32 refrigerant and R125/refrigerant plus R134a refrigerant in a certain proportion. It is an environmentally friendly refrigerant that does not destroy the ozone layer. R407C has very similar characteristics and performance to R22, so it has become a long-term alternative to R22. At present, it is the most widely used refrigerant in the chiller system, which is environmentally friendly and economical. The chiller with R407C refrigerant is affordable.

R404A: As R404A belongs to the HFC type non-azeotropic environmentally friendly refrigerant (completely does not contain ozone-depleting CFC, HCFC), it is currently recognized and recommended by most countries in the world as a mainstream low-temperature environmentally friendly refrigerant. It is widely used in low-temperature chiller systems. middle.

R410A: It is a new environmentally friendly refrigerant that does not contain chlorine and does not destroy the ozone layer. Because the working pressure is about 1.6 times that of the ordinary R22 chiller, the cooling (warming) efficiency is high, and the material requirements for the chiller condenser and evaporator are Higher, therefore, the price of R410A chiller is higher than R22 and R407C. The new R410A refrigerant is composed of two quasi-azeotropic mixtures R32 and R125 each with 50%, mainly composed of hydrogen, fluorine and carbon elements (expressed as hfc), which is stable, non-toxic, and superior in performance. R410A was once recognized as the most suitable refrigerant to replace R22, and it has been popularized in Europe, America, Japan and other countries. R410A replaces the global trends in major international markets and prospects for its use and the dynamics of entering the international market.

R134a (is one of the most widely used medium and low temperature environmentally friendly refrigerants. It has good comprehensive performance, making it a very effective and safe alternative to R12 (dichlorodifluoromethane), which can be applied to the use of R12 refrigeration In most areas of refrigerant. Because the cooling effect of R134A is much lower than that of R22 and R407C, the cost of the R134A chiller system is much higher than that of R22/R407C under the same cooling capacity requirement.

If you don’t know how to choose the type of refrigerant for your chiller, Call us, Get your right cooling water system!

The air-cooled chiller is a kind of industrial chiller, and the main working principle is not much different from that of the water-cooled chiller. Air-cooled chiller is a machine that cools water at room temperature to a certain temperature through the compressor of the chiller. It is generally common in industrial manufacturing. However, air-cooled chillers are widely used, mainly for high-speed electric shafts, electric Spindles, CNC machine tools, etc. Because the air-cooled chiller has a lightweight structure and is easy to move quickly, the air-cooled chiller is favored by various industrial fields.

The heat dissipation fins can also be called fin condensers or fin coil heat exchanger. They are an important part of air-cooled chillers for heat dissipation and refrigeration. Its main function is to cool and condense the superheated steam of the high-temperature chiller discharged from the refrigeration compressor into a liquid. The refrigerant is The heat is released from the condenser and the cooling medium is taken away, so as to ensure the normal and effective operation of the industrial chiller. However, after the radiating fins are used for a long time, some ash layer or impurities will be adsorbed on the fin condenser. Only by cleaning the condenser of the industrial chiller can the efficient use of the industrial chiller be ensured.

So how to clean the cooling fins (condensers) of industrial chillers? Oumal Chiller recommends that you can use an air gun to clean it, but it should be noted that because the fins on the condenser are thin, the air pressure of the air gun cannot be adjusted too high, otherwise the condensation will be damaged when the dust is cleaned from finned coil heat exchanger.

At the same time, when using the cooling fins of the industrial chiller, pay attention to the maintenance and maintenance of the cooling fins. The cooling water of the industrial chiller is regularly replaced to prevent too much scale. Regularly check the pipeline corrosion of industrial chillers and the tightness of the pipeline to avoid pipeline blockage and perforation leakage accidents. It is recommended to purchase a fully enclosed circulating pipeline, which is safer. If your industrial chiller does not run for a long time, you should remove the water in the condenser and circulating water pump to avoid freezing the refrigeration equipment.

During the use of the chiller, cleaning and maintenance are also particularly important. Regular cleaning and maintenance can make our air-cooled chillers have a longer life and better cooling effect.

If you buy air cooled chiller unit from Oumal, the chiller water fan coil unit need to Clean regularly. If you have other questions about how to clean the chiller or shell and tube cleaing. Please contact us.

The structure of low-temperature chillers is similar to that of piston chillers. Low-temperature chillers generally refer to chillers whose outlet temperature is less than or equal to 5°C. They are mainly used for process cooling in food processing, chemical, pharmaceutical and other industries. Low-temperature chillers are usually used for low-temperature requirements on certain special production lines in the industry. Low-temperature chillers can generally reach about -40°C.

Low-temperature chillers are quite different from conventional chillers in terms of unit design due to the lower temperature of the outlet water. The most basic difference is that on the chilled water side, the cryogenic unit needs to be added with the appropriate type and concentration of antifreeze. Low-temperature chillers include low-temperature air-cooled chillers, low-temperature water-cooled chillers, low-temperature screw chillers, and low-temperature piston chillers. So how to control the temperature of the outlet water of the low-temperature chiller?

The main refrigerants used in low-temperature chillers are ethylene glycol solution, sodium chloride solution and calcium chloride solution. Their operating temperatures are as follows: ethylene glycol solution 4～-20℃, sodium chloride solution -15～-25 ℃, calcium chloride solution -20～-45℃. The chiller that has used glycol as the refrigerant is also called glycol chiller. The water supply temperature of the low-temperature chiller is determined according to user needs. However, it should be noted that the condensation point of brine is related to the concentration of brine. Therefore, the brine concentration of the equipment must ensure that it freezes inside the evaporator of the chiller. The actual operating temperature should be 5～8℃ higher than the freezing point of brine. Secondly, it should be noted that the concentration of sodium chloride solution and calcium chloride solution must not exceed their eutectic concentration.

In addition, sodium chloride solution and calcium chloride solution have a corrosive effect on metal materials. Corrosion inhibitors should be added during use to adjust the pH of the solution to 7.0-8.5. Add sodium dichromate as a corrosion inhibitor, the addition amount is: add 3.2kg sodium dichromate per 1 cubic meter of sodium chloride solution, and add 2kg sodium dichromate per 1 cubic meter of calcium chloride solution.

Controlling the outlet temperature of low-temperature chillers can not only increase the cooling capacity of low-temperature chillers, but also help companies increase production. Omar Refrigeration provides customized production of low-temperature chillers. According to the customer's water temperature, water tank size, compressor type, and type of refrigerant, it provides customized chillers. For the price of low-temperature chillers, please contact us for the most detailed solution.