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Factory Price 250 kW 350 hp Industrial Water Cooling Screw Air Compressor
Choosing a Rotary Screw Air Compressor: Air-Cooled vs. Water-Cooled
When selecting a rotary screw air compressor, there are two cooling configurations to choose from: air-cooled or water-cooled. Air compressors create a lot of heat during their normal operation. The heat primarily comes from the motor, air end and cooling circuit. Customers need to choose between an air-cooled or water-cooled compressor, and this decision is based upon the size, location and utilities available to the air compressor. Compressing air from 0 to 125 psig creates heat through the "heat of compression" process. A cooling circuit removes the heat from the compressor by a radiator and fan combination (air-cooled) or a shell and tube exchanger (water-cooled).
In the rotary screw market, it is estimated about 80% of compressors are air-cooled, while 20% are water-cooled. Most rotary screw compressors are air-cooled - especially those below 100 hp. Smaller rotary screw compressors, such as those 40 hp and below, are typically only available in an air-cooled configuration. Water-cooled compressors become more common in larger machines, between 125-600 hp.
The reason a customer opts for air-cooled versus water-cooled is based on their environment, space considerations, costs of water cooling and if water is available. The following questions can help you begin to determine which product to choose.
What are the requirements for water-cooled compressors?
If the customer's environment is caustic or extremely dirty, a water-cooled solution may be the best fit. There are many different designs of cooling towers and each has its advantages and disadvantages. Customer need to consider the initial cost of the tower plus the energy required and maintenance that goes along with cooling tower designs. Customers can also use other sources of cooling water like public supply water, self-supplied well water, river, ocean or lake water. A major consideration when using a natural water supply is the cleanup of the water once it passes through the compressor. Chilled water is also a consideration if the customer has this type of equipment, but typically this is avoided due to the high costs associated with chilled water systems.
What are the requirements for air-cooled compressors?
Air-cooled compressors require adequate amounts of cooling air for the inlet and enough space for discharge. Without enough space, customers may encounter temperature regulation issues which can cause nuisance shutdowns or equipment failures. Ductwork to the inlet and from the discharge typically gets cool air into the compressor package and the discharged hot air can be removed from the plant. In the wintertime, this heat can be directed into the plant to help heat the factory.
Hence, if you have a rather confined space, water-cooled compressors may be a better choice.
How are energy costs affected for air-cooled vs. water-cooled?
Water-cooled units can require less power compared to an air-cooled compressor, but customers should also consider the electrical costs of the cooling system, water and water treatment costs when opting for water-cooled. Once factoring in those expenses, air-cooled compressors are typically more cost-effective.
On the other hand, some customers use the cooling water to preheat plant processes, such as for boilers, to save on gas and heating bills. They then realize savings in that area.
What's the case for air-cooled compressors?
Considering escalating water costs and regulations, plants have sought ways to decrease their cooling water requirements. Compressed air systems consume a high volume of water to cool the compressed air circuit. Many air-cooled rotary screw compressors have seen design improvements and can accept higher ambient temperatures than in the past. In addition, customers will realize the most savings in terms of reduced water consumption. An air-cooled compressor system typically requires less capital costs, less installation costs and can be put anywhere in the factory setting.
Ultimately, it comes down to a customer's specific application and location as to whether an air-cooled or water-cooled rotary screw compressor will best serve their needs. After the customer has made these considerations and studied the financial impact with the help of a compressed air expert, they can determine which best suits their facility.
Advantages of water-cooled air compressors:
1. When the cooling water circulates, the water-cooled air compressor can clean the unit. It can effectively extend the service life of the unit and improve the quality of compressed gas.
2. Water-cooled air compressors can quickly adapt to temperature changes by increasing or decreasing water pressure.
3. Suitable for industries with high dust content, such as textiles, spraying, titanium dioxide, etc.
4. The cooler of the water-cooled machine focuses on cleaning the oil, which the air-cooled machine cannot do.Technical Parameters
| Direct Driven Screw Air Compressor | |||||||||
| Model | Air Delivery (m3/min) | Power (kW) |
Noise (Db) |
Outlet diameter |
Dimension (mm) | Weight (Kg) |
|||
| 7bar | 8bar | 10bar | 13bar | L * W * H | |||||
| RK10A | 1.3 | 1.2 | 1.0 | 0.7 | 7.5 | 63 | G3/4 | 900*650*860 | 190 |
| RK15A | 1.8 | 1.7 | 1.6 | 1.0 | 11 | 65 | G3/4 | 1150*750*960 | 320 |
| RK20A | 2.4 | 2.3 | 2.0 | 1.6 | 15 | 65 | G3/4 | 1150*750*960 | 340 |
| RK30A | 3.7 | 3.6 | 3.2 | 2.8 | 22 | 68 | G1 | 1350*850*1120 | 430 |
| RK40A | 5.2 | 5.0 | 3.9 | 3.4 | 30 | 68 | G1 | 1500*1000*1350 | 600 |
| RK50A | 6.5 | 6.2 | 5.6 | 4.9 | 37 | 69 | G1 1/2 | 1500*1000*1350 | 650 |
| RK60A | 8.0 | 7.3 | 6.0 | 5.9 | 45 | 70 | G1 1/2 | 1500*1000*1350 | 730 |
| RK75A | 10.1 | 9.5 | 8.7 | 7.3 | 55 | 70 | G2 | 1700*1200*1550 | 950 |
| RK100A | 13.6 | 12.8 | 11.3 | 9.2 | 75 | 72 | G2 | 1700*1200*1550 | 1050 |
| RK125A | 16.1 | 15.5 | 13.6 | 12.5 | 90 | 72 | G2 | 2100*1400*1650 | 1420 |
| RK150A | 21.2 | 19.6 | 17.8 | 15.5 | 110 | 72 | DN65 | 2500*1650*1900 | 2200 |
| RK175A | 24.1 | 23.2 | 19.5 | 17.8 | 132 | 72 | DN65 | 2500*1650*1900 | 2400 |
| RK220A | 28.8 | 27.8 | 23.0 | 20.0 | 160 | 72 | DN80 | 3000*1900*1950 | 3650 |
| RK250A | 32.5 | 31.2 | 27.5 | 25.8 | 185 | 72 | DN80 | 3000*1900*1950 | 3950 |
| RK275A | 34.5 | 34.0 | 30.5 | 28.0 | 200 | 76 | DN80 | 3600*2200*2200 | 4200 |
| RK300A | 36.8 | 35.0 | 32.0 | 30.0 | 220 | 76 | DN100 | 3600*2200*2200 | 4600 |
| RK350A/W | 43.0 | 41.5 | 38.0 | 34.9 | 250 | 76 | DN100 | 3600*2200*2200 | 5900 |
| RK375A | 51.3 | 50.6 | 46.0 | 41.5 | 280 | 82 | DN100 | 3600*2200*2200 | 6000 |
| RK420A | 56.8 | 55.9 | 50.1 | 42.0 | 315 | 82 | DN125 | 4600*2300*2430 | 7800 |
| RK420W | 56.8 | 55.9 | 50.1 | 42.0 | 315 | 82 | DN125 | 4200*2300*2430 | 7500 |
| RK475A | 66.1 | 65.4 | 55.1 | 46.0 | 355 | 85 | DN125 | 4600*2300*2430 | 8200 |
| RK475W | 66.1 | 65.4 | 55.1 | 46.0 | 355 | 82 | DN125 | 4200*2300*2430 | 7900 |
1.Packing Details: Plywood crate pallet plus foam board and bubble film, Full closed wooden case. 1pcs/each package (for stationary screw air compressor)
2.Shipping method: by sea, by LCL/FCL or as requested
3.Delivery method: FOB, CFR, CIF and EXW etc.
4.Delivery time: in 7-15 days after receiving deposit (customized machines not included)
Shanghai Rocky Machinery Co., Ltd. was established in 2003 and has 18 years of experience in the air compressor industry. It is an innovative enterprise integrating production, trade, service, research and development.
Our company dominates strong technical skill, advancing manufacture equipment and testing device, execute strictly of ISO9001 quality management system. As a CE certificated manufacturer, our Oil-free series air compressor also reaches Germany TUV Class 0 standard.
Main products have passed the testing of national technical authorities, energy consumption level has reached the international advanced level. With more than 120 skilled employees and 18 senior engineers, each production process is performed standardly and strictly. Germany technology and 14 years export experience have helped us to gain more than 30 loyal overseas agents, and our valued customers have spread across more than 130 countries.
Rocky will continue to promote technological innovation and progress in line with the mission of "innovation reflects value", and achieve win-win results with global partners, suppliers and employees. Create a new world of "energy saving, envir-onmental protection and intelligence" inthe field of air compressors
Q1. Are you trading company or manufacture ?
A: We are professional manufacture of screw air compressor of Taicang,Jiangsu,China. More than 18 years of experience in air compressor manufacturing.
Q2. How long is the delivery time ?
A: For standard voltage ,15 working days. Non-standard ,please contact our sales.
Q3. What's payment term ?
A: T/T, L/C, D/P, Western Union, Paypal, Credit Card, and etc. Also we could accept USD, RMB, Euro and other currency.
Q4. How about your after-sales service ?
A: 1.Provide customers with installation and commissioning online instructions.
2. Well-trained engineers available to overseas service.
3.Worldwide agents and after service avaiable.arrange our engineers to help you training and installation.
Q5. How about your warranty?
A: One year for the whole machine and two years for screw air end, except consumable spare parts.
Q6. Do you have any certificate ?
A: Yes, per different customer's market need ,we can offer CE ,ISO etc certificate.
Q7. What about the maintenance ?
A: First maintenance need to be done after 500Hours, and then every 2000-3000 hours to do the normal maintenance, and consider the actual environment.
Q8. How do you control quality ?
A: 1. The raw materials are strictly inspected
2. Some key parts are imported from overseas
3. Each compressor must pass at least 5 hours of continuous testing before leaving the factory.
Q9. Do you offer OEM service ?
A: Yes.Both OEM & ODM service can be accepted.
Q10.How long could your air compressor be used?
A: Generally, more than 10 years.
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