In modern HVAC (Heating, Ventilation, and Air Conditioning) systems, both AHU (Air Handling Unit) and Chiller play essential roles in treating and cooling air, although they serve different functions and have distinct structural components. This article will help clarify the differences, comparing these two systems in terms of structure, operating principles, and their unique advantages. AHU and Chiller are both devices and systems used to treat air. AHU is the air handling unit, while Chiller is the air conditioning system. So how do p Differentiate, compare AHU and Chiller different?
Nội dung bài viết:
Structure and Purpose of AHU
The AHU, or Air Handling Unit, is a heat exchanger widely used in HVAC systems, commonly found in industries like pharmaceuticals, cosmetics, and electronics. AHUs are typically utilized in commercial buildings and shopping centers, where air circulation and filtration are crucial for comfort and air quality.
Components of an AHU:
- Fan: Moves air through the unit.
- Heat Exchanger: Manages temperature adjustments.
- Cooler: Adds coolness to the air.
- Air Filter: Filters dust and impurities.
- Protective Cover: Ensures safety and protects components.
Structure and Purpose of Chiller
A Chiller, also known as a central chiller system, is designed to generate a cold water source primarily for cooling objects, food, and various applications requiring temperature control. Unlike AHUs, Chillers are generally produced as clusters rather than standalone units.
The central air-conditioning system using Chillers produces cold water by refrigerating it through an evaporator at an input temperature of around 12°C and a target temperature of approximately 7°C.
Components of a Chiller System:
- Refrigeration Compressors: Three types – spiral, screw, and centrifugal compressors.
- Outdoor Unit (Condenser Beam Tube): Assists with heat release.
- Chiller Evaporator: Includes dry, submerged, and stainless steel types.
- Control Cabinet: Manages and monitors system operations.
Operating Principle Differences
AHU Operation:
When the room temperature exceeds the set temperature, the AHU’s 3-way valve opens to allow cold water through the heat exchanger, which cools the air before it circulates into the room. For air purity, a prefilter and bag filter are used, and for highly sanitized environments, a HEPA filter may be added. The air passes through the heat exchanger inside the AHU to create cool, filtered air, which then flows into a chamber that distributes it to air-conditioned spaces.
Chiller Operation:
The Chiller’s main function is to supply chilled water to Fan Coil Units (FCUs) for space cooling. The chilled water loop begins with the compressor, which can vary in type depending on the cooling capacity needed. For instance, screw compressors are used for high-capacity needs, while centrifugal compressors are better suited for moderate cooling demands.
Evaporator Types:
- Water Flowing Inside the Tube: Copper tubing where water is cooled externally. These units are insulated to prevent freezing.
- Water Flowing Outside the Pipe: Helps reduce freezing risks, although maintenance can be challenging.
Comparing Advantages of AHU and Chiller
AHU Advantages:
- Strong, lightweight panels with high thermal insulation and rust resistance.
- Low leakage rate, reducing condensation and energy loss.
- Customizable capacities for various applications.
- Quiet operation with low noise levels.
- ARI certified, ensuring high performance.
Chiller Advantages:
- Capacity ranging from 5 tons to several thousand tons.
- Compact piping design, making it ideal for high-rise buildings.
- Long-lasting and durable with stable performance.
- Various load reduction options for optimized energy use.
- Suitable for large-scale projects with consistent temperature control.
In Conclusion
INTECH has outlined key distinctions between AHUs and Chillers, focusing on their structure, operation, and benefits. By understanding these three aspects, it becomes easy to identify which system best meets the specific cooling requirements of a project.
Liên hệ: 0976.404.895
📥 Email: contact@intechgroup.vn
🌐 Website: air-cleantech.vn
Tin liên quan