What is an ACU? Structure and Applications of Air Clean Units | Tan Long

In design standards industrial refrigeration system và HVAC, việc kiểm soát độ sạch cục bộ là yếu tố sống còn để đảm bảo chất lượng sản phẩm. Vậy What is ACU? và tại sao nó lại đóng vai trò then chốt trong các môi trường yêu cầu khắt khe như dược phẩm hay điện tử?

Với hơn 20 năm kinh nghiệm thực chiến trong tư vấn và lắp đặt thiết bị xử lý không khí, chuyên gia từ Tan Long sẽ phân tích chi tiết từ cấu tạo, nguyên lý vận hành đến cách phân biệt ACU với What is AHU? hay các loại PLC control cabinet đi kèm. Bài viết dưới đây sẽ giúp bạn có cái nhìn toàn diện nhất để tối ưu chi phí và hiệu suất cho công trình của mình.

What is ACU?

What is ACU? Viết tắt của cụm từ Air Clean Unit (Thiết bị Làm sạch Không khí), đây là một giải pháp kỹ thuật chuyên dụng được dùng để điều hòa, lọc bụi và duy trì áp suất dương cho luồng không khí trước khi đưa vào hệ thống phòng sạch.

Trong các dự án thiết kế và lắp đặt hệ thống lạnh công nghiệp, ACU đóng vai trò như một “trạm trung chuyển” khí sạch. Điểm ưu việt của hệ thống này là khả năng cung cấp lưu lượng khí sạch ổn định mà không cần sử dụng sàn nâng lưới (raised floor), giúp tối ưu hóa chi phí xây dựng cơ bản.

Bên cạnh đó, các dòng ACU hiện đại do Tan Long tư vấn thường tích hợp sẵn bộ điều khiển thông minh để quản lý chặt chẽ nhiệt độ và độ ẩm. Việc hiểu rõ cấu trúc này tương tự như việc nắm vững cold storage structure, giúp chủ đầu tư vừa tiết kiệm không gian lắp đặt, vừa dễ dàng vận hành và bảo trì thiết bị về lâu dài.

Common types of ACUs used in cleanrooms today

Depending on the area, budget, and required level of cleanliness, choosing the right type is important. What is ACU? This will directly affect the overall operational performance. HVAC systemCurrently, in cleanroom installation projects, there are two types of Air Clean Units most commonly used:

Direct-blown Air Clean Unit (ACU)

To understand this device, we first need to know... What is ACU?An ACU (Air Conditioning Unit) is a specialized air conditioning processing device that plays a crucial role in air conditioning systems. HVAC and cleanrooms. Among these, direct-blowing ACUs (or self-supplying ACUs) are designed to deliver clean air directly into the usable space without the need for a complex duct network. This is an effective localized air handling solution, often recommended by Tan Long for small-scale cleanrooms or areas requiring rapid clean air supply.

The application of direct-blowing ACUs offers the following specific technical and operational advantages:

• High flexibility: The device has a compact and lightweight design, allowing it to be moved and installed in various locations within the room depending on changing production needs.
• Optimizing initial investment costs: By eliminating the duct system, the investor can significantly save on material costs and installation time.
• Easy to maintain: The technical components are located directly on the machine body, allowing the operating team easy access for cleaning the dust filters or performing routine inspections.

However, in addition to the advantages, users should be aware of some specific limitations of this type of machine in order to arrange it appropriately:

• Uneven gas distribution: Due to the lack of a directional airflow system, the airflow from the ACU often concentrates in one area, easily causing differences in cleanliness and temperature between points in the room.
• Operating noise: Because the booster fan and mechanical components are located directly in the workspace, noise levels are typically higher compared to ducted ACU systems located in technical rooms.
• Scope limitations: This device is not the optimal choice for large cleanrooms or environments requiring absolute pressure control and cleanliness.

When selecting a direct-blowing ACU, engineers need to carefully calculate parameters such as cooling capacity, filter efficiency (HEPA/ULPA), and standard noise levels. To ensure the system's durability, customers should prioritize products from reputable suppliers and strictly adhere to the manufacturer's maintenance procedures. For projects requiring higher stability, such as standard cold storage or industrial cleanroom installations, combining ducted ACUs or specialized air handling units like AHUs will be a perfect alternative to provide a stable airflow and effectively control microclimate parameters.

Ducted ACU

Ducted air handling units (ACUs), also known as ducted air units, are a type of air handling unit connected to a duct system to distribute clean air to various locations within a space. To understand this better... What is ACU? In an industrial context, you can imagine this as a crucial component in the system. HVACIt plays a crucial role in controlling temperature, humidity, and cleanliness in environments requiring stringent standards. At Tan Long, we often recommend this solution for large-scale cleanrooms or cold storage installations that require absolute climate uniformity at every point.

Ducted ACU solutions offer superior performance and operational advantages:

• Optimal air distribution capability: Clean air is channeled through a network of ducts, helping to maintain cleanliness and stable pressure in all areas, eliminating temperature "dead zones".
• Effective noise control: Because fans and other major mechanical components are typically installed outside the work area or in a separate technical room, noise levels within the workspace are minimized.
• Aesthetic appeal and design flexibility: The system can be installed flush with the ceiling or concealed, optimizing interior space and creating a comfortable working environment for employees.

However, when deciding to invest in this system, business owners need to carefully consider the technical aspects and costs:

• The installation process is complex: Designing and constructing a proper duct system requires a team of highly skilled engineers to ensure that airflow is not lost.
• Initial investment costs: The cost of ducted air conditioning units (ACs) is typically higher than that of direct-blowing units due to the additional ducting and accessories required.
• Space requirements: Sufficient technical space is required (usually above the false ceiling) to accommodate the gas duct network.

Khi lựa chọn lắp đặt, quý khách hàng cần đặc biệt chú trọng đến công suất máy, hiệu suất lọc bụi và kích thước hệ thống ống gió sao cho tương thích. Việc sử dụng các thiết bị chất lượng từ nhà cung cấp uy tín như Tân Long, kết hợp với chế độ bảo trì định kỳ, sẽ giúp ACU hoạt động bền bỉ và đạt hiệu suất cao nhất. Trong một số trường hợp đặc thù, việc kết hợp giữa ACU nối ống gió và hệ thống xử lý không khí trung tâm AHU sẽ mang lại hiệu quả vượt trội, giúp tối ưu hóa chi phí vận hành và tính ROI dài hạn cho dự án.

Cấu tạo chi tiết của hệ thống ACU (Air Clean Unit)

Mặc dù có kích thước nhỏ gọn để tối ưu diện tích và tiết kiệm năng lượng, nhưng cấu tạo của ACU vẫn đảm bảo đầy đủ các thành phần kỹ thuật khắt khe. Hiểu rõ cấu tạo không chỉ giúp bạn trả lời câu hỏi What is ACU? một cách tường minh mà còn giúp quá trình vận hành, bảo trì diễn ra chính xác hơn.

Các bộ phận chính cấu thành nên một bộ ACU tiêu chuẩn bao gồm:

• Khung vỏ bảo vệ: Thường được chế tạo từ thép sơn tĩnh điện hoặc nhôm cách nhiệt. Đặc biệt, phần thân vỏ thường sử dụng các loại vỏ panel cách nhiệt tỷ trọng cao để ngăn chặn thất thoát nhiệt và đảm bảo độ kín khít tuyệt đối cho phòng sạch.
• Hệ thống lọc khí đa cấp: ACU sử dụng các tầng lọc khác nhau tùy theo yêu cầu của môi trường.
  • Đối với phòng bán sạch: Thường dùng lọc G4 để tối ưu chi phí.
  • Đối với phòng sạch tiêu chuẩn (như kho dược phẩm, điện tử): Yêu cầu kết hợp lọc G4 và lọc HEPA H13 để loại bỏ 99,97% bụi mịn, đảm bảo độ sạch tối đa.
• Bộ điều khiển nhiệt độ và độ ẩm thông minh: Đây là điểm khác biệt lớn nhất giữa ACU và What is AHU?. ACU cho phép đặt ngay trong phòng sạch và tích hợp sẵn hệ thống điều khiển tinh vi. Các linh kiện như thiết bị bảo vệ, rơ-le, MCCB và màn hình cảm ứng HMI (Human-Machine Interface) được thiết kế đồng bộ trong PLC control cabinet, giúp người dùng dễ dàng giám sát thông số thời gian thực.
• Hệ thống trao đổi nhiệt và cấp khí: Bao gồm quạt cấp cao áp, dàn sưởi và industrial refrigeration. Ngoài ra, bộ phun ẩm giúp duy trì độ ẩm lý tưởng, đóng vai trò then chốt trong việc bảo quản các sản phẩm nhạy cảm với môi trường.

Nguyên lý hoạt động của ACU: Quy trình xử lý khí sạch tiêu chuẩn

To understand better What is ACU?, chúng ta không chỉ nhìn vào cấu tạo mà phải phân tích cách luồng không khí được “làm mới” hoàn toàn trước khi đưa vào môi trường sản xuất. Khác với các hệ thống thông gió thông thường, ACU vận hành theo một quy trình tuần hoàn khép kín và cực kỳ khắt khe để duy trì độ sạch cục bộ.

Quy trình 6 bước xử lý không khí của Air Clean Unit

Mọi luồng gió hồi từ phòng sạch sẽ được xử lý qua các giai đoạn sau để đạt chất lượng chuẩn kỹ thuật:

1. Gió hồi qua lọc sơ cấp G4: Loại bỏ các hạt bụi kích thước lớn để bảo vệ các linh kiện bên trong.
2. Xử lý nhiệt tại dàn lạnh công nghiệp: Hạ nhiệt độ và tách ẩm, đảm bảo môi trường luôn khô thoáng.
3. Cân bằng độ ẩm tại bộ tạo ẩm: Bổ sung hơi ẩm cần thiết nếu môi trường quá khô (đặc biệt quan trọng trong ngành linh kiện điện tử).
4. Tạo áp suất qua quạt cấp: Quạt ly tâm công suất cao đẩy luồng khí vào hệ thống ống gió.
5. Lọc tinh qua lọc HEPA H13: Bước “chốt chặn” cuối cùng, loại bỏ 99,97% vi khuẩn và hạt bụi siêu mịn.
6. Phân phối vào phòng sạch: Luồng khí sạch tuyệt đối được đưa vào phòng qua các cửa gió trên trần.

Cơ chế phân phối gió thẳng đứng

Hệ thống ACU hoạt động dựa trên cơ chế tạo ra luồng gió theo phương thẳng đứng (Vertical Laminar Flow) thông qua hệ thống ống gió lắp đặt áp trần. Luồng khí này đi từ trên xuống, giúp đẩy các hạt bụi phát sinh trong quá trình làm việc xuống sàn và ra ngoài qua hệ thống cửa gió hồi.

Nguyên lý này không chỉ giúp tối ưu hóa không gian lắp đặt mà còn đảm bảo sự đồng nhất về nhiệt độ và độ sạch tại mọi vị trí trong phòng. Toàn bộ quy trình này được giám sát chặt chẽ bởi hệ thống PLC control cabinet, giúp tự động điều chỉnh các thông số kỹ thuật dựa trên dữ liệu từ cảm biến thời gian thực.

In Tan Long, chúng tôi tùy chỉnh nguyên lý vận hành này phù hợp với từng mô hình doanh nghiệp, từ kho dược phẩm đến nhà máy sản xuất thực phẩm, nhằm đáp ứng các điều kiện kỹ thuật và yêu cầu bảo quản khắt khe nhất của HVAC system.

Practical applications of ACU in various industries.

ACUs have numerous applications in various industries, especially in those requiring high levels of cleanliness such as pharmaceuticals, electronics, and healthcare.

Application of ACU in pharmaceutical manufacturing (GMP/GSP standards)

In the pharmaceutical industry, understanding is crucial. What is ACU? And applying this equipment scientifically is a key factor in meeting stringent standards such as GMP (Good Manufacturing Practice) and GSP (Good Pharmaceutical Storage Practices). The ACU acts as a central air handling system, providing absolute control over cleanliness, humidity, and temperature, thereby preventing cross-contamination and ensuring the highest purity of pharmaceuticals before they reach consumers.

Integrating a standard ACU system offers practical benefits for businesses:

• Maintain GMP certification: Support factories in meeting stringent air cleanliness level requirements (Class A, B, C, D) in direct production areas.
• Preventing pollution and cross-contamination: Through high-performance filtration membranes, ACU thoroughly removes fine dust, bacteria, and harmful agents, maximizing the stability of pharmaceuticals.
• Optimize storage conditions: Perfectly integrated with the system. cold storage To maintain the ideal temperature range for heat-sensitive vaccines or medications.
• Protecting the health of the workforce: Creating a well-ventilated, fresh-air working environment helps employees maintain optimal health.

Currently, Tan Long is providing consulting and installation services for specialized ACU systems in key areas of the pharmaceutical industry, such as:

• Mixing and extraction room: This is a place that requires the highest level of cleanliness to prevent bacteria from contaminating the raw materials.
• Finished product packaging room: Ensure a completely sterile environment during the finishing process.
• GSP warehouse system: Store medicines and raw materials under the standard conditions set by the Ministry of Health.
• Laboratory and testing: Microclimate control is essential to ensure the accuracy of biochemical analysis results.

Applications in the production of electronic and semiconductor components.

In the field of electronics and semiconductor manufacturing, establishing a controlled environment for ultrafine particulate matter is crucial. To answer this question... What is ACU? In this segment, it can be understood as a critical terminal device in HVAC systems, responsible for maintaining stable cleanliness, humidity, and temperature in cleanrooms. Because semiconductor components are extremely sensitive to dust and static electricity, the ACU acts as a "protective filter" to eliminate fault-causing agents during lithography and chip packaging.

The application of standard ACUs in the electronics manufacturing process brings the following core values:

• Ensure the required yield rate: By strictly controlling suspended dust particles, ACU prevents contamination of the wafer surface, minimizing product defects and ensuring that component quality meets international standards.
• Increase productivity and optimize costs: Maintaining a stable working environment helps machinery operate continuously, reducing downtime due to breakdowns or cross-contamination, thereby optimizing ROI for the business.
• Automation support: Modern ACU systems typically integrate various components. PLC control cabinet To monitor parameters in real time, ensuring the system always operates within the permissible parameter range.
• Protecting measuring equipment: Electronic testing and inspection laboratories require a temperature-neutral environment to ensure the absolute accuracy of their measuring instruments.

Currently, Tan Long is implementing advanced air treatment solutions for various specialized areas within the electronics industry:

• Semiconductor chip manufacturing room: Areas requiring the highest level of cleanliness with standard HEPA/ULPA filters.
• SMT component assembly room: Control humidity to prevent static electricity and oxidation of the weld.
• Quality Control (QC) area: Ensure a sterile environment and stable temperature for component durability testing.
• Cold storage system for components: Preserve semiconductor materials that are sensitive to natural environmental conditions.

The combination of in-depth knowledge of What is ACU? With practical experience in implementing projects at large factories, Tan Long provides optimal solutions, helping businesses to confidently produce and meet all the stringent standards of Industry 4.0.

Applications of ACU in hospital operating rooms and laboratories.

In medical and research settings, understanding is crucial. What is ACU? It's not just a conventional air conditioning unit; it's the "heart" of the infection control system. An ACU (Air Conditioning Unit) is the terminal device in an HVAC system, responsible for processing fresh air, filtering fine dust and microorganisms through specialized filters (HEPA). In modern hospitals, ACUs are designed to create positive pressure, helping to maintain absolute cleanliness in operating rooms and testing areas, preventing any risk of external pathogens entering.

The medical-grade ACU system advised and installed by Tan Long offers the following core values:

• Thorough infection control: The ACU removes airborne dust particles, bacteria, and viruses, minimizing the risk of postoperative infections for patients.
• Create a safe recovery environment: Maintaining ideal temperature and humidity helps stabilize the physiological state of patients in intensive care units (ICUs).
• Protecting medical staff: Ventilation and exhaust gas treatment systems help remove excess anesthetic gases and airborne pathogens, ensuring the safety of healthcare workers during their work.
• Ensure the accuracy of the experiment: In laboratories, ACUs help stabilize the environment so that measuring equipment and samples are not degraded by external temperature or humidity.

Currently, our air treatment solutions are widely used in:

• Sterile operating room: Strict control is required over the number of particulate matter and the rate of convective airflow.
• Intensive Care and Emergency Room: Locations requiring a continuous supply of fresh air 24/7.
• Microbiology and Biochemistry Laboratory: Ensure a clean environment equivalent to pharmaceutical cleanroom standards.
• Negative pressure isolation zone: Use specialized ACUs to prevent pathogens from spreading into the community.

The combination of modern ACU equipment and an automated monitoring system via PLC control panel allows healthcare facilities to easily manage real-time environmental parameters. For units requiring storage of medical supplies and vaccines, we also provide integrated cold storage solutions with ACU systems to ensure the healthcare supply chain always meets the highest quality standards.

Comparing ACU and AHU: When should you use which type?

Both ACU (Air Clean Unit) and AHU (Air Handling Unit) are important air handling devices, but they have different characteristics and applications. The choice of the appropriate device depends on the specific requirements of each application.

Features	ACU	AHU
Main functions	Filters the air, maintaining local cleanliness.	Controlling temperature, humidity, and air filtration for entire buildings or large areas.
Scope of application	Cleanroom, an area requiring a high degree of cleanliness.	Office buildings, shopping malls, manufacturing plants (large areas)
Size	Compact, easy to install and move.	Larger sizes require separate installation space.
Filtration capacity	HEPA/ULPA filters, high filtration efficiency.	Coarse filter, fine filter, possibly HEPA/ULPA filter (optional)
Control	Simple, local control	Complex, centrally or locally controlled
Expense	Lower than AHU	Higher than ACU
Noise	It may be higher than the AHU (depending on the design).	Typically lower than the ACU (due to the fan and other components being located outside the operating area).
Maintenance	Simpler, easier to replace the filter.	More complex, it requires regular maintenance of the entire system.

In some cases, ACUs and AHUs can be used in combination to achieve optimal air handling efficiency. For example, an AHU can be used to pre-treat the air and supply conditioned air to the ACU, helping the ACU operate more efficiently and extending the lifespan of the filter.

Cleanroom ACU installation process at Tan Long

The construction and installation process of an ACU (Air Conditioning Unit) for a cleanroom requires meticulous attention to detail and strict adherence to technical standards to ensure the equipment operates at its optimal performance. To understand the importance of this equipment, we need to know... What is ACU? In HVAC systems, this is the end-stage air handling unit responsible for maintaining cleanliness, temperature, and residual pressure in the room. At Tan Long, we apply a scientific construction process, optimized through numerous large projects, to ensure that the system meets ISO or GSP standards for our customers.

Step 1: On-site survey and in-depth technical consultation

Before implementation, Tan Long's engineering team will conduct a site survey to assess microclimatic factors and technical infrastructure. Based on the collected data, we will provide the most optimal solutions for your business.

• Defining cleanroom standards: Analyze the requirements for cleanliness levels (Class A, B, C, D) and the types of pollutants that need to be controlled.
• Actual measurements: Survey the area size, assess the surrounding environmental conditions, and determine the optimal location for installing the ACU to ensure good airflow.
• Proposed solution: We advise on the most suitable ACU type (direct blowing or ducted) along with optimal energy-saving solutions.

Step 2: Calculate and select equipment with appropriate power capacity.

The choice of equipment is not based solely on concept. What is ACU? Furthermore, it must be based on the ROI (return on investment) calculation. The machine's capacity must be calculated precisely to avoid wasting electricity or failing to achieve the required cleanliness level.

• Calculate the cooling load and airflow rate: Based on room size and staff/equipment density, choose the most suitable capacity.
• Choose a reputable brand: Tan Long is committed to using high-quality ACU units with full CO/CQ certifications and dust filtration performance that meets standards.
• Input quality control: All equipment undergoes a rigorous factory inspection process before being shipped to the customer's cold storage or cleanroom installation site.

Step 3: Installation, connection, and commissioning

This is the most crucial stage, requiring high technical expertise to ensure the system operates stably and reliably. The process is carried out by Tan Long's team of skilled technicians:

• Mechanical installation: Securely position the ACU in its designed location, ensuring a perfect seal to prevent any loss of clean air.
• Connecting the control system: Connect the device to the power supply and the PLC control panel to monitor operating parameters such as temperature, humidity, and pressure differential.
• Operational testing (Commissioning): Conduct system testing to check noise levels, vibration, and actual air filtration efficiency.
• Parameter calibration: Fine-tune operating parameters to ensure the equipment reaches optimal performance, perfectly meeting the established technical standards.
• Handover and operational training: Once the system meets the standards, we will proceed with the handover and provide detailed training to the customer's technical team to ensure safe and efficient operation.

Technical notes for efficient and long-lasting ACU operation.

To ensure the ACU operates efficiently and reliably, the following technical considerations must be followed:

• Regular cleaning: Regularly clean the ACU to remove dust and contaminants that accumulate on the equipment's surfaces and in the filtration system.
• Replace the filter: Replace the filter membranes regularly as recommended by the manufacturer to ensure effective air filtration.
• Inspection and maintenance: Regularly inspect and maintain the ACU components to detect and rectify any problems promptly.
• Adjust the parameters: Adjust the ACU's operating parameters to match the cleanroom's cleanliness and pressure requirements.
• Use correctly: Use the ACU correctly according to the manufacturer's instructions to avoid damaging the equipment.
• Ensure a stable power supply: Ensure that the power supply to the ACU is stable and meets the voltage and power requirements.
• Track performance: Monitor the ACU's performance to detect any abnormalities and take timely corrective action.
• Keep a journal: Maintain an ACU operation and maintenance log to track the equipment's operation and maintenance history.

Why choose Tan Long as your ACU supplier and installer?

Understanding the nature What is ACU? This is just the beginning of building a standard climate-controlled environment. For the system to be truly effective, ensuring cleanliness and durability, businesses need a partner with in-depth implementation capabilities. Tan Long is proud to be a pioneer in Vietnam specializing in providing comprehensive ACU solutions for cleanrooms, combining practical experience with internationally standardized technical processes.

By choosing services at Tan Long, customers will receive the following distinct benefits:

• Extensive practical experience: We have completed hundreds of ACU installation projects for demanding segments such as GSP-certified pharmaceutical factories, high-tech electronics component manufacturing, and sterile operating room systems in major hospitals.
• Highly skilled technical team: Tan Long's engineers not only have a thorough understanding of HVAC systems but also possess the ability to handle complex technical problems related to air convection and room pressure.
• High-quality equipment, integrated with technology: All ACU products we supply are CO/CQ certified, operate smoothly, and are easily integrated with PLC control panel systems for remote parameter monitoring.
• Comprehensive and dedicated solutions: From design consultation and cold storage installation to routine maintenance, Tan Long always accompanies customers to ensure uninterrupted system operation.
• Cost optimization and ROI: We are committed to providing the most competitively priced solutions, helping businesses save on operating energy and extend equipment lifespan.
• Brand reputation and commitment: With the motto "Quality creates trust," Tan Long is committed to meeting all stringent standards for cleanliness and technical safety for each project.

In short, from the definition What is ACU? From mastering its structure, principles, and practical applications, it's clear that this is an indispensable device in modern industries. Compared to larger systems like AHUs, ACUs offer superior flexibility and local efficiency. Investing in and operating ACUs correctly not only protects the health of workers and improves product quality but also forms the foundation for the sustainable development of businesses. Tan Long is always ready to be a reliable partner, providing the best clean air solutions for our valued customers.

Frequently Asked Questions about ACU

Here are some frequently asked questions about ACUs:

Are ACUs more energy-efficient than AHUs?

Generally, ACUs can be more energy-efficient than AHUs in certain situations. This is because ACUs are typically used for localized air handling, while AHUs are used to handle air for an entire building or large area. Therefore, an ACU only needs to work to clean the air in a small area, while an AHU has to work to clean the air for the entire area.

However, the energy savings of an ACU compared to an AHU depend on several factors, such as the size of the air treatment area, the required cleanliness, and the efficiency of the equipment. In some cases, if the air treatment area is large and requires high cleanliness, using an AHU may be more energy efficient.

How often should the filter in the ACU be replaced?

The filter replacement schedule in an ACU depends on several factors, such as the type of filter, the level of air pollution, and the length of use. Generally, pre-filters need cleaning or replacement once a month, fine filters need replacement every 3-6 months, and HEPA/ULPA filters need replacement every 1-2 years.

However, to ensure effective air filtration, the manufacturer's recommendations regarding filter replacement time should be followed. Additionally, the filters should be inspected periodically to detect any signs of damage or blockage and replaced promptly.