Cleanroom Design

In the realm of high-tech industries, where even the slightest trace of contamination can compromise product quality or research outcomes, cleanroom design and build are paramount. From semiconductor manufacturing to pharmaceutical research, cleanrooms serve as sanctuaries, isolating delicate processes from external pollutants. Today, let’s delve into the intricate world of cleanroom design, examining its principles, challenges, and the innovation that drives its construction.

1. The Essence of Cleanroom Design

At its core, cleanroom design revolves around three fundamental principles: air filtration, surface materials, and environmental control. Each element contributes to maintaining an environment free from particles, microorganisms, and other contaminants that could disrupt sensitive operations.

• Air Filtration: High-efficiency particulate air (HEPA) filters are the backbone of cleanroom ventilation systems. These filters are capable of removing up to 99.97% of particles as small as 0.3 microns in diameter, ensuring a constant flow of clean air. The design must account for airflow patterns, ensuring even distribution and minimizing dead zones where contaminants can accumulate.
• Surface Materials: Everything from walls, floors, to ceiling panels is selected for their non-shedding, easy-to-clean properties. Stainless steel, PVC, and epoxy-coated surfaces are common choices due to their resistance to corrosion, bacteria growth, and the release of particles.
• Environmental Control: Temperature, humidity, and pressure are tightly regulated within cleanrooms to prevent fluctuations that could impact product stability or introduce contamination. Design considerations include insulation, dehumidification, and airlocks to minimize external influences.

2. Challenges in Cleanroom Design

Cleanroom Design and building a cleanroom is a complex undertaking, fraught with unique challenges:

• Customization: Every cleanroom project is unique, requiring tailored solutions based on the specific requirements of the industry, processes, and products involved.
• Compliance: Meeting regulatory standards, such as ISO Classifications (ISO 14644) and Good Manufacturing Practices (GMP), is crucial. Designers must ensure every aspect of the cleanroom adheres to these stringent guidelines.
• Integration: Cleanrooms often need to seamlessly integrate with existing facilities, posing challenges in terms of logistics, infrastructure, and maintaining cleanliness during construction.

3. How to Do cleanroom design ？

Designing a cleanroom is a complex and intricate process that requires comprehensive consideration of multiple factors to ensure it meets the cleanliness requirements of specific industries. Here are some key steps and considerations for designing a clean room:

(1) Clearly define requirements and standards

• Determine the purpose: Firstly, clarify the specific purpose of the cleanroom, such as pharmaceutical production, semiconductor manufacturing, biological laboratories, etc., as different industries have different requirements for cleanliness.
• Understanding standards: Familiarize oneself with and follow relevant industry standards, such as the ISO 14644 series standards, which specify particle control requirements for different cleanliness levels.

(2) Develop a design plan

• Space layout: Based on the functional requirements of the clean room, plan the space layout reasonably to ensure smooth workflow and reduce the risk of cross contamination.
• Airflow design: Design a reasonable airflow pattern, such as one-way flow, turbulent flow, etc., to ensure the cleanliness and uniformity of indoor air. For areas with high cleanliness requirements, laminar flow hoods or local exhaust measures can be used.
• Material selection: Choose building materials that are easy to clean, do not produce particles, and are corrosion-resistant, such as stainless steel, PVC board, epoxy flooring, etc.
• Filtering system: Equipped with high-efficiency particulate air (HEPA) filters to ensure that the air entering the clean room reaches the required level of cleanliness.
• Temperature and humidity control: Design a temperature and humidity control system to meet the environmental requirements of specific processes or experiments.

(3) Detailed design and verification

• Detailed cleanroom design: Based on the preliminary design plan, carry out detailed drawing design and construction instructions, including electrical system, water supply and drainage system, lighting system, etc.
• Simulation verification: Use computational fluid dynamics (CFD) and other tools to simulate airflow and pollutant distribution, and verify the feasibility of the design scheme.
• Cleanroom design review: Invite experts or third-party organizations to review the design proposal to ensure compliance with relevant standards and requirements.

(4) Construction and Installation

• Select construction team: Choose a construction team with clean room construction experience to ensure construction quality and progress.
• Construction preparation: Preparation work before construction, such as site cleaning, material procurement, equipment debugging, etc.
• Construction and installation: Install according to the design plan, including the installation of walls, floors, ceilings, filtration systems, temperature and humidity control systems, etc.
• On site monitoring: Conduct on-site monitoring and inspection during the construction process to ensure that the construction quality and progress meet the requirements.

(5) Verification and Debugging

• Installation Verification (IQ): Verify whether the cleanroom equipment and systems are installed as designed, including checking the installation position, connection method, sealing, etc. of the equipment.
• Operational Qualification (OQ): Verify whether the equipment and system meet the design requirements under operating conditions, including testing the operational effectiveness of the air conditioning system and the filtration efficiency of the filtration system.
• Performance Verification (PQ): Verify whether the cleanroom meets the expected performance standards under actual operating conditions, including air cleanliness testing, airflow mode testing, microbial monitoring, etc.

(6) Maintenance and Management

• Develop maintenance plan: Develop a regular maintenance plan for the cleanroom, including cleaning, inspection, and replacement of filters.
• Personnel training: Train the personnel using the clean room to ensure they understand the rules and operating procedures of the clean room.
• Monitoring and recording: Regularly monitor and record various parameters of the clean room to promptly detect and handle abnormal situations.