Air-Cooled Condensing Unit
An air-cooled condensing unit is a compact system that includes a compressor, condenser, fan, and expansion valve. Its primary role is to convert refrigerant gas into a liquid state within the refrigeration cycle. These units come in various capacities, ranging from small to medium sizes, depending on the buyer’s requirements.
It’s worth noting that the function of the condensing unit aligns with the vapor compression refrigeration cycle. Low-temperature vapor exits the evaporator and flows to the condensing unit, where it is converted into a liquid phase. Designed for outdoor installation, these units feature a durable body built to withstand harsh weather conditions.
Components of the Air-Cooled Condensing Unit
The key components of an air-cooled condensing unit align with the refrigeration cycle. Below is a detailed breakdown of these components:
Frame
The frame is constructed from galvanized steel, offering excellent resistance to environmental factors like humidity, rust, and corrosion. To enhance durability, it is coated with polyester powder, ensuring reliable performance even in harsh weather conditions. Its modular design allows for easy removal of panels, providing convenient access to internal parts for maintenance and repairs.
In the ATCA air-cooled condensing unit, the robust body is made from pre-galvanized steel sheets with an electrostatic paint coating. This design minimizes corrosion and decay, making it ideal for challenging climatic conditions. The condenser is mounted on a galvanized steel chassis with similar electrostatic coating.
Compressors
Air-cooled condensing units typically feature hermetic or semi-hermetic compressors known for their simple design, high efficiency, and quiet operation. Key features include:
- Oil sight glass: Enables monitoring of oil levels.
- Internal protection system: Prevents overheating.
- Oil sump: Ensures proper lubrication of internal components.
- Rubber vibration isolators: Minimize noise and vibration.
In the ATCA series, compressors from reputable global brands such as Bitzer, DWM, Maneurop Danfoss, Copeland, and Refcomp are available. These brands can be selected based on the buyer’s preference.
Fans
Fans create airflow through the condenser coils, facilitating heat dissipation from the refrigerant to the surrounding environment. The units use axial fans with three-phase motors.
The ATCA air-cooled units are equipped with reverse-rotation cold storage axial fans from premium brands like Ziehl-Abegg or EBM Germany, which ensure low-noise operation. The fans have a protection class of IP54 and are backed by a one-year warranty. Depending on the unit’s capacity, fan diameters range from 30 to 63 cm, and electrical specifications are 380V/50Hz or 220V/50Hz, connected to the terminal box on the unit.
Condenser
The condenser features copper tubes with aluminum fins, designed to maximize heat transfer efficiency. The aluminum fins provide an increased contact surface, accelerating the cooling process.
- Refrigerant circuits: Configurable as single or dual independent circuits based on system capacity.
- Fin spacing: Available in 3 mm or 4 mm options.
The condensers undergo nitrogen testing up to 450 psi to ensure durability.
Electrical Board
The electrical board is a critical system component, housing various electrical elements for control and protection, including:
- Main switch with safety door lock: Prevents unauthorized access.
- Fuses and overload protectors: Safeguard compressors and other components.
- Intermediate relays: Facilitate control signal transmission.
- External connection terminals: Enable integration with control and management systems.
Valves and Control Devices
The ATCA air-cooled condensing unit comes pre-equipped with valves and control devices, including:
- Vibration isolators
- Receiver valve, manual valve, solenoid valve
- Sight glass, filter drier
- High and low-pressure controls, compressor oil pressure control
All components are nitrogen-tested at 450 psi and ready for installation. Additional options, such as oil separators and liquid separator tanks, are available upon request.
Technical Equipment
Key technical equipment featured in air-cooled condensing units includes:
- Compressors: Scroll, screw, and reciprocating compressors from renowned global brands like Danfoss, Bitzer, Copeland, and Hanbell.
- Fans: High-efficiency axial fans from trusted manufacturers such as Siemens, Ziehl-Abegg, and EBM.
- Corrosion Prevention: Special protective coatings for units installed in corrosive environments, such as marine or industrial areas.
- Filter Drier: A crucial component for removing moisture and impurities from the refrigerant.
- Sight Glass: A monitoring tool that enables operators to observe refrigerant flow and oil levels.
Capacity Range of the Air-Cooled Condensing Unit
The ATCA series condensing units offer a capacity range of 2.5 to 183.5 kW, compatible with refrigerants such as R507, R502, R134a, R404a, and R22. These units can be customized to suit both mild and tropical climates, tailored to meet specific customer requirements. Additionally, condensing units with unique capacity specifications can be designed and manufactured based on customer orders.
Applications of the Air-Cooled Condensing
UnitThe ATCA air-cooled condensing unit is highly versatile and compatible with Freon family refrigerants, making it suitable for a wide range of applications. These include HVAC systems, clean rooms, low-temperature and high-temperature cold storage, as well as specialized storage for meat, poultry, fish, shrimp, fruits, vegetables, and pharmaceuticals. It is also ideal for freezing tunnels, achieving operating temperatures from -45°C to +12.5°C.
In addition to its storage capabilities, the ATCA condensing unit is used for the distillation, storage, and transfer of refrigerants within refrigeration and HVAC systems. With a broad capacity range, the unit caters to diverse cooling needs and can be selected from the product catalog based on the required cooling capacity and specific environmental conditions.
Advantages and Disadvantages of the Air-Cooled Condensing Unit
The air-cooled condensing unit offers several advantages and disadvantages, as summarized below table:
| Disadvantages | Advantages |
| Reduced efficiency at high ambient temperatures: System efficiency decreases in hot air due to limited heat transfer. | No need for water: Operates solely with air, suitable for water-scarce areas. |
| Higher power consumption: Due to the use of high-powered fans for cooling. | Easy installation: No need for cooling towers or complex auxiliary equipment. |
| Susceptibility to the environment: The system’s performance depends on the ambient temperature and airflow. | Resistance to freezing: Suitable for cold regions and sub-zero temperature conditions. |
| Fan noise: Can generate noise near buildings, especially in larger models. | Easy maintenance: Simple design with easy access to components. |
| Larger size: Requires more space compared to similar systems. | Lower long-term costs: No cooling towers required, reducing water-related repair costs. |
Design and Construction Based on Standards
The design and construction of air-cooled condensing units adhere to the following international standards:
- American Standard ARI 460-2000: Specifies requirements for air-cooled condensers with forced air circulation.
- American National Standard ANSI/ASHRAE 20-1997: Outlines methods for measuring the capacity of air-cooled condensers with forced air circulation.
- European Standard ENV 327: Provides guidelines for testing air-cooled condensers with forced air circulation.
Technical Table of the Air-Cooled Condensing Unit
The technical table of the air-cooled condensing unit contains all the essential information, such as the operating temperatures for the compressor and evaporator, the model of the condensing unit, and the compressor model. Below is a sample of the technical table for the ATCA air-cooled condensing unit.
Refrigeration Capacity (W)
Suction Return Temperature 25°C No Liquid Subcooling R-22 50 Hz
| Evaporating Temperature (°C) | Condensing Temp. (°C) | Compressor Model | Condensing Unit Model | ||||
| 25- | 20- | 15- | 10- | 5- | |||
| 3130 | 4010 | 5000 | 6140 | 7351 | 27 | 300FSV2-F | ATCA-300-FL |
| 2870 | 3750 | 4740 | 5880 | 7090 | 32 | ||
| 2350 | 3140 | 4030 | 5020 | 6210 | 43 | ||
| 4190 | 5430 | 6830 | 8300 | 9980 | 27 | 400FSV2-F | ATCA-400-FL |
| 3930 | 5170 | 6570 | 8040 | 9720 | 32 | ||
| 3290 | 4380 | 5700 | 7120 | 8480 | 43 | ||
| 5160 | 76730 | 8660 | 10800 | 13170 | 27 | 503FSV2-F | ATCA-503-FL |
| 4900 | 6470 | 8400 | 10540 | 12910 | 32 | ||
| 3960 | 5360 | 7040 | 9000 | 11160 | 43 | ||
| 7930 | 10150 | 12820 | 15740 | 19090 | 27 | 755FSV2-F | ATCA-755-FL |
| 7670 | 9890 | 12560 | 15480 | 18830 | 32 | ||
| 6530 | 8100 | 10690 | 13650 | 16640 | 43 | ||
Catalog of the Air-Cooled Condensing Unit
To view all the technical specifications of the air-cooled condensing unit, please refer to the official product catalog available on the Atlas Cooling website.
Price of the Air-Cooled Condensing Unit
The price of the air-cooled condensing unit varies depending on factors such as cooling capacity and the brand of the equipment. However, you can purchase this unit at a competitive price from Atlas Refrigeration, along with original equipment from reputable brands. All products from Atlas Refrigeration are manufactured in accordance with American national standards and European Union regulations and come with a valid warranty.
Design and Construction of the Air-Cooled Condensing Unit
The design and construction of the air-cooled condensing unit must adhere to the American standard ARI 460-2000, which outlines the manufacturing and installation requirements for air-cooled condensers with forced air circulation. Additionally, the American national standard and the European standard ENV 327 must be considered during production.
At Atlas Co., a range of air-cooled condensing units is produced while ensuring compliance with all global standards. These units are designed to work with common refrigerants, such as R22 and R134a. Renowned compressors from reputable brands, including Danfoss, Bitzer, and others, are incorporated into the design and construction of these devices.
Atlas Co. Services Regarding the Air-Cooled Condensing Unit
The technical and engineering team at Atlas Co. has extensive experience in manufacturing a wide range of air-cooled condensing units. We have successfully collaborated with both large and small companies across various industries in our country. The key advantage of our products lies in the use of advanced, up-to-date technology in their manufacturing, as well as incorporating top global brands, all at highly competitive prices.
For a free professional consultation before placing your order, feel free to contact our technical experts at Atlas Co. You can reach out using the contact information provided on our website.
Conclusion
In conclusion, air-cooled condensing units with modern design and advanced equipment offer an ideal solution for cooling needs in various environments. With benefits such as no reliance on water, easy installation, and the ability to operate in harsh weather conditions, these units are an excellent choice for industries such as food, pharmaceuticals, and HVAC. If you’re seeking a reliable and eco-friendly cooling system, air-cooled condensing units are a smart and efficient choice.
Yes, air-cooled condensing units can be used in humid and corrosive environments, such as coastal areas, by applying corrosion-resistant coatings to the condenser.
While these units can operate in high ambient temperatures, their efficiency may decrease. To maintain optimal performance in such conditions, it’s important to select the appropriate model and consider using auxiliary equipment.
The lifespan of an air-cooled condensing unit is influenced by factors such as the quality of internal components, use of the correct refrigerant, regular maintenance, and the environmental conditions in which it operates.
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