RACA Journal October 2025 RACA_October2025 | Page 33

Project

Reflecting on the evolution of refrigeration plant design, Arnold highlighted substantial advancements over the last decade. " The design has evolved significantly. Previously, configurations often involved simplex or multiplex systems for each temperature requirement. Current designs favour a single, large multiplex system providing both low and medium temperature refrigeration, which offers enhanced diversity and operational flexibility. This is particularly advantageous as it allows continued plant operation even with individual compressor maintenance, improving overall system resilience." He also noted improvements in condenser technology, specifically the integration of adiabatic pads on gas coolers to pre-cool intake air, thereby increasing efficiency.

Addressing the higher initial capital expenditure associated with CO₂ systems, Arnold emphasised the anticipated longterm economic advantages. " From an energy consumption standpoint, the savings are significant. Furthermore, we anticipate that the cost of CO₂-specific components, such as compressors and valves, will decrease as market demand increases. Therefore, the long-term operational costs, particularly energy usage which represents a major expense, are expected to be considerably lower." The projected substantial reduction in energy consumption throughout the system ' s lifespan is expected to offset the initial higher investment.

The integrated CO₂ system at the East London Massmart store serves as a compelling case study for the economic and environmental advantages of embracing natural refrigerant technology, paving the way for a more sustainable future in commercial refrigeration and air conditioning. RACA

“ This necessitated a phased commissioning approach, operating only a limited number of units at a time to ensure plant functionality.”

Blower coils

HC Group