Designing Walk-In Chillers for Pharmaceutical Facilities
When it comes to pharmaceutical walk-in chiller and storage, precision is everything. In particular, medications, vaccines, and biologics are highly sensitive to temperature and humidity fluctuations. Even minor deviations can compromise product integrity, leading to financial loss or worse—risk to patient safety.
That’s why walk-in chillers designed for pharmaceutical facilities must go beyond basic refrigeration. Specifically, these systems must support stable, controlled environments with built-in safeguards to maintain compliance with stringent regulations like Good Distribution Practices (GDP).
In this article, we’ll explore three essential factors in designing effective walk-in chillers for pharma use:
- Ensuring proper airflow and humidity control
- Building redundancy into cooling systems
- Meeting compliance requirements under GDP
1. Ensuring Proper Airflow and Humidity Control
In a pharmaceutical walk-in chiller, uniform temperature and humidity distribution is critical. Certain medicines—particularly biologics and injectable treatments—are extremely sensitive not only to heat but also to moisture levels. Furthermore, poor airflow can lead to hot or cold spots, while uncontrolled humidity can encourage microbial growth or degrade packaging.
Best Practice: Use a Well-Engineered Air Distribution System
A well-designed air distribution system ensures even temperature circulation from top to bottom and corner to corner. Moreover, high-efficiency evaporator fans, defrost cycles, and proper return air ducting prevent stratification and maintain temperature uniformity, usually within ±2°C.
Humidity Control
Most walk-in cold rooms and walk-in chillers operate within a relative humidity (RH) range of 45%–65%, depending on the type of pharmaceutical product stored. Incorporating dehumidifiers or humidifiers, as needed, into the chiller system helps meet this requirement.
Case Study: Vaccine Storage Facility in Singapore
In one Singapore-based pharmaceutical logistics facility, Kiat Lay installed a customised walk-in chiller with ceiling-mounted evaporators and high-velocity fan coils to eliminate dead air zones. The system also integrated a dedicated humidity control unit, allowing operators to maintain RH between 50–55%, ideal for vaccine storage. As a result, the client passed multiple audits with zero non-compliance reports.
2. The Importance of Redundancy in Cooling Systems
Downtime in a pharmaceutical cold room isn’t just inconvenient—it can be catastrophic. If temperature excursions aren’t caught quickly, stored medications can become unusable, requiring disposal and recall.
To safeguard against equipment failure, redundancy in design is critical.
Key Strategies:
Dual Compressor Systems: Equip the chiller with two compressors that alternate during operation or act as a backup when one fails.
Backup Power Supply: For added reliability, install an uninterruptible power supply (UPS) and diesel generator to keep the system running during blackouts.
Real-Time Monitoring: Implement sensors with alert systems that notify facility managers of temperature deviations in real-time.
Case Study: Biologics Storage for Regional Distribution Hub
A global pharmaceutical company partnered with Kiat Lay to build a high-capacity walk-in chiller at their regional distribution hub. The system featured twin cooling circuits, each capable of independently maintaining the target temperature of 2–8°C. In addition, the facility used a real-time monitoring platform that sent SMS and email alerts for any anomalies. This redundancy setup helped the client maintain zero loss during a power outage that lasted over two hours.
3. Compliance with Good Distribution Practices (GDP)
Regulatory compliance is non-negotiable in pharmaceutical logistics. The European Union’s GDP guidelines, adopted widely across the globe including in Singapore, require that medicinal products be stored and transported under conditions that do not compromise their quality.
Key GDP elements relevant to walk-in chiller design include:
Temperature Mapping: Prior to use, chillers must undergo rigorous temperature mapping to verify uniform conditions throughout the space. Mapping should be redone periodically or whenever changes are made to the storage layout or equipment.
Calibration and Validation: All temperature sensors and data loggers used must be calibrated against national standards. The chiller itself must be validated to prove it can consistently meet required conditions.
Documentation and Traceability: Systems should include data logging and storage for temperature and humidity readings. This data must be readily available for audits and investigations.
Kiat Lay’s GDP-Compliant Approach
Kiat Lay’s walk-in chillers are designed with full GDP compliance in mind. Every project includes:
- Full documentation of the system design, components, and layout
- Installation of calibrated sensors with data logging capabilities
- Support for qualification processes including Installation Qualification (IQ), Operational Qualification (OQ), and Performance Qualification (PQ)
Choosing the Right Partner for Your Pharmaceutical Cold Room
Designing and installing a walk-in chiller for pharmaceutical use is not a one-size-fits-all process. Each facility has unique storage needs, whether it’s temperature range, space constraints, or product types. Working with an experienced provider like Kiat Lay ensures your cold room is engineered to perform reliably, remain compliant, and protect your pharmaceutical inventory.
Why Kiat Lay?
- Over 30 years of experience in cold chain solutions
- Proven track record with pharmaceutical and healthcare clients
- In-house design, fabrication, and servicing teams
- Commitment to energy efficiency and long-term performance
Final Thoughts
Walk-in chillers are the backbone of any pharmaceutical cold storage facility. But not all chillers are created equal. Designing for airflow and humidity control, incorporating redundancy, and meeting GDP requirements are all essential to ensure operational success.
Whether you’re building a new facility or upgrading an existing one, make sure your walk-in chiller design is tailored for compliance, reliability, and peace of mind.
Looking for a pharmaceutical-grade walk-in chiller?
Contact Kiat Lay cold room specialist today for a customised solution backed by decades of cold chain expertise.