Space optimisation: high-performance units for tight layouts
In contemporary industrial refrigeration, space has in many cases become the real limiting factor of the project. Increasingly product-dense rooms, compact process tunnels, roofs saturated with equipment and structural constraints imposed by existing buildings force designers and technical managers to deal with tight layouts, often already defined before the refrigeration plant design even begins.
In these contexts, the risk is not so much being unable to install the units, but building systems that, once in operation, quickly show their limits. Every reduction in space introduces additional resistance to the plant’s operation, which can be physical (such as a lower or shorter room) or functional, linked to a high load density or to geometries that hinder air circulation. When the flow is slowed or diverted, the installed cooling capacity loses effectiveness and the system enters a sub-optimal operating condition.
It is in these conditions that temperature differences within the room, longer process times and microclimate instability emerge — effects that are particularly evident in high-intensity applications such as rapid chilling and freezing, where even a few minutes can affect the final quality of the product and its commercial value.
Power density: a concept to handle with care
The most immediate response to space constraints is to increase the power density, concentrating more cooling kW in a reduced volume. In practical terms, however, increasing the capacity without rethinking the air distribution means further loading the ventilation system. In congested environments, the truly decisive parameter is not so much the nominal flow rate, but the available static pressure, i.e. the fan’s ability to overcome the resistances of the real layout.
This is where many standard solutions show their limits. Designed for “average” conditions, they work well in free, regular rooms, but struggle when they have to push air through dense trolleys, multi-level pallets or tunnels with forced geometries.
Designing from the flow, not from the machine
A genuinely engineering approach to space optimisation always starts from the analysis of the airflow. Even before choosing a unit, it is necessary to understand where the air must reach, what obstacles it will encounter and with what uniformity it must operate.
In cooling and freezing tunnels, where blast freezers and shock freezers are installed, for example, the goal is not just to cool, but to do so quickly and evenly across the whole load. In these cases, air coolers designed for high static pressure make it possible to maintain high air velocities even under strong resistance, ensuring cycle times consistent with the process specifications.
The compactness of the unit, in this context, should therefore not be understood as a simple reduction in size, but as the ability to integrate into the layout. Configurations based on horizontal coils, structures with easily removable panels and maintenance-designed access points allow correct positioning in the tunnel and become functional elements of the project, not secondary details.
The often-underestimated role of the exchange coil
When space is limited, the heat-exchange coil tends to be “compressed” too. However, reducing the coil’s volume without considering the fin spacing and the operating conditions can have negative effects in the medium term.
In low-temperature, high-humidity environments, an overly tight fin spacing favours rapid frost formation. This entails more frequent defrosts, an increase in energy consumption and a progressive loss of efficiency. In tight layouts, where the air already struggles to move, the effect is amplified.
A conscious design sometimes accepts a slightly larger footprint in exchange for greater operational stability. This is the principle guiding the adoption of correctly sized exchange coils and, when floor space is a constraint, of V-shaped configurations, which make it possible to increase the exchange surface while keeping the plant’s overall footprint compact. It is a choice that pays off over time, especially in continuously running applications.
Operational continuity and maintenance: the real test
A compact plant that delivers its performance only in ideal conditions introduces a factor of fragility into the system. In tight layouts, maintenance is often the first thing to be sacrificed, with direct effects on operational reliability and service continuity.
Fan accessibility, coil inspection, drain-tray management and ease of defrosting are aspects that must be integrated into the design from the outset. In real industrial environments, where plant downtime has a high cost, the ability to intervene quickly is part of the unit’s performance.
Optimisation does not stop at evaporation
Condensation also plays a key role when space is limited. Congested roofs or reduced technical spaces require solutions capable of concentrating high capacities in contained surfaces.
Compact condensers, microchannel or V-geometry (such as the RCVS, RCVM and RCVD lines), make it possible to respond to these constraints without penalising efficiency. Integrating adiabatic systems also makes it possible to manage summer peaks without oversizing the plant, with clear benefits for consumption and operating stability.
Applications where compactness is a necessity, not a choice
In chilling and freezing tunnels, space is often dictated directly by the process line. The units must operate in extreme conditions, with high thermal loads and tight cycle times, within strongly constrained geometries. In these contexts, as in the applications developed by Refteco for high-intensity freezing tunnels, the use of air coolers and unit coolers designed for high static pressure makes it possible to concentrate the cooling capacity without compromising cooling uniformity, keeping product quality under control even in limited spaces.
In large logistics rooms, the problem changes in nature: it is not the installable capacity that is the main constraint, but the ability to distribute it effectively within deep, densely loaded volumes. A typical example is rooms with shelving, where the free space for installation is limited and the air meets numerous obstacles. In applications of this kind, as in the case of a fresh-product cold room in France, compact dual-flow configurations made it possible to fit between the existing structures while ensuring a uniform airflow and operating conditions compatible with the presence of staff.
Similar situations occur in rooms with limited usable height, often typical of retrofit plants. In a tropical-fruit storage project in Italy, the reduced distance between shelving and ceiling required the development of particularly low units, but longer than standard. The adoption of high-static-pressure blowing fans made it possible to compensate for the constrained geometry, ensuring uniform, time-stable ventilation, an essential requirement for the long storage of the product.
Finally, in ripening processes, the spatial constraint can become even more extreme, to the point of leaving no free surfaces on either the wall or the ceiling. In banana-ripening rooms, the design required rethinking the use of the available volumes, integrating functions that are normally separate. In these cases, the engineering concerns not only the distribution of air through multiple pallets, but also the integration of elements such as lighting directly on the refrigeration units, turning a physical limit into a functional, orderly solution.
Optimising space in industrial refrigeration does not mean passively adapting to a constraint, but recognising it as a fully-fledged design variable. Every plant has specific geometric, operational and regulatory constraints that can hardly be solved with standard solutions. This is why space optimisation requires an engineering approach based on the analysis of the context and on the application experience gained in the field.
If you are dealing with a complex layout, a critical space or a retrofit with stringent constraints, engaging a technical partner can make the difference right from the early design stages. Contact our engineers and submit your application case: together we will analyse flows, geometries and operating conditions to identify a solution consistent with your process, today and over time.
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