By Eamonn Ryan
The recent episode of Taking the Temperature on HVACR featuring Jamie Kitchen, Jörg Saar, and John Broughton offered a comprehensive exploration of mobile and stationary refrigeration systems. Listeners gained insight into system design, compressor engineering, component selection and cold chain management. This is part seven of a seven-part series.
Kitchen summarised the overarching theme: “There are differences in what you need to do in mobile refrigeration and air conditioning to match the applications.” Mobile systems contend with vibration, fluctuating temperatures and variable power sources, whereas stationary systems prioritise stability, efficiency and minimal maintenance.
Best practices for mobile refrigeration include:
- Proper mounting of compressors: Semi-hermetic and scroll compressors must be secured to handle vibration without damaging internal components. Face seal connections allow maintenance without disturbing surrounding pipes.
- Component selection for movement: Flexible hoses, baffles in oil sumps, and electronic pressure regulators provide adaptability in trucks, buses or ships.
- Proactive maintenance: Frequent replacement of filter driers and regular inspection of mounts and hoses prevent system failures. Broughton emphasised, “Maintenance strategies are built into the design.”
- Power management: Systems must balance battery, diesel or generator power depending on the vehicle type. Electric buses rely on battery packs, while long-haul trucks and reefer containers often use diesel engines or auxiliary generators.
- Cold chain integrity: Multiple compartments, adjustable temperatures and precise control ensure perishable goods remain viable. Saar highlighted, “The system must maintain environment precisely, otherwise the goods are compromised.”
For stationary systems, best practices include:
- Rigid frame mounting of parallel compressors to prevent fractures
- Proper vibration isolation within rack systems to avoid loose connections or leaks
- Regular inspection and maintenance schedules, even though vibration and movement are less severe than in mobile systems
Kitchen concluded that understanding these differences is critical for engineers, technicians and logistics professionals. “Whether it’s trucks, buses or large ships, understanding design, operation and maintenance ensures reliability, efficiency and product quality.”
This discussion demonstrates that refrigeration technology is highly context-dependent. Mobile systems face challenges that stationary units do not, requiring specialised knowledge in component durability, system flexibility, and cold chain logistics. Meanwhile, stationary systems benefit from predictability, but still demand careful design and maintenance to maintain operational integrity.
For HVACR professionals, fleet operators and cold chain managers, these insights are invaluable, providing practical guidance for system selection, maintenance planning and operational decision-making in both stationary and mobile applications.