By 
The refrigeration system for a new food business in Perth is not the kind of decision that can be easily revisited once construction has begun. Unlike a signage decision or a fit-out colour choice, the refrigeration infrastructure determines the physical layout of your cold storage, the electrical supply required from the building, the drainage provisions in the floor, and in the case of coolrooms, the structural elements of the space itself.
Getting these decisions wrong at the design stage creates problems that range from inconvenient to genuinely expensive. A coolroom that is undersized for peak stock levels forces operational compromises from day one. A refrigeration electrical load that was not adequately accounted for in the switchboard design creates supply constraints that limit future capacity. A coolroom positioned for aesthetic convenience rather than operational workflow adds unnecessary steps to every stock movement in the facility.
For Perth food business owners who are planning a new fit-out, a new build, or a significant expansion, this article covers the design decisions that should be made before construction begins, what the commercial refrigeration and electrical disciplines need from each other, and how to avoid the most costly mistakes in commercial cold storage planning.
Starting With the Cold Chain: What Temperatures Do You Actually Need?
The starting point for any commercial refrigeration design is understanding the specific temperature requirements of the products being stored. This sounds obvious, but a significant number of commercial refrigeration installations in Perth food businesses are designed around a generic assumption rather than the specific requirements of the operation.
Different product categories require different storage temperatures, and the temperature requirements have both regulatory and product quality dimensions:
Chilled storage for perishable foods under the Food Standards Code requires temperatures at or below 5 degrees Celsius. Most commercial chilled storage is designed to maintain 2 to 4 degrees as the working range, providing a margin against the regulatory limit.
Frozen storage requirements under the Food Standards Code specify minus 15 degrees Celsius as the maximum, but most commercial freezer operations target minus 18 degrees as standard practice, with blast chilling processes requiring much lower temperatures for rapid product temperature reduction.
Produce and floral storage often requires higher temperatures than standard refrigeration, typically 8 to 12 degrees, and higher humidity than standard coolroom designs provide.
Wine and beverage storage has temperature requirements that are more about quality than food safety, typically targeting 12 to 14 degrees for red wine service temperature.
A business that needs multiple temperature zones, as most hospitality and food retail operations do, requires either separate coolroom structures for each temperature range or a multi-temperature refrigeration system. Understanding this at the design stage determines how many coolrooms are needed, how they are positioned relative to each other and to the work areas they serve, and what the total refrigeration load on the electrical supply will be.
Coolroom Sizing: How to Avoid Under- and Over-Specifying
Sizing commercial coolrooms correctly is one of the areas where inexperienced design produces the most practical problems. The tendency is to size based on current stock levels, which consistently underestimates the actual requirement.
Coolroom sizing should account for:
Peak stock levels, not average levels. If a hospitality business receives its primary weekly delivery on Tuesday and the coolroom is designed for typical mid-week stock levels, the Tuesday evening fill will overflow into other storage areas or require stacking that compromises airflow and product rotation.
Product rotation requirements. Good cold storage practice requires FIFO (first in, first out) product rotation, which means shelving must be accessible from both front and back or organised in a way that allows older stock to be accessed first without moving newer stock. A coolroom that is correctly sized by volume may be incorrectly proportioned for the rotation practices the business needs.
Circulation space and access. A coolroom needs enough working space to allow staff to access all shelved products comfortably, to move product trolleys if applicable, and to manage stock safely. Reducing the circulation space to maximise storage volume creates a facility that is difficult and time-consuming to work in.
Future growth provision. A business that is planned to grow over the next few years should size its coolroom for the projected peak stock level at maturity, not the current level at opening. Adding coolroom capacity after initial construction is significantly more expensive than sizing correctly at the outset.
For Perth food businesses planning a new installation, consulting with specialists in commercial refrigeration design and installation provides access to the operational experience needed to size cold storage for genuine business requirements rather than initial estimates.
The Coolroom Construction Decisions That Affect Long-Term Performance
Beyond the sizing question, the construction specification of a coolroom determines how it performs and how much it costs to operate across coolroom service life.
Insulation thickness and thermal performance. The refrigeration unit keeps the coolroom at the required temperature. The insulated structure determines how hard that refrigeration unit has to work. Better insulated panels reduce the heat load on the refrigeration system, which reduces running costs and extends equipment life. In Perth’s climate, where ambient temperatures can exceed 40 degrees in summer, the thermal performance of the coolroom structure has a direct and significant effect on refrigeration energy consumption.
Door seals and door design. The door is the most thermally vulnerable point of any coolroom. Seals must be in excellent condition to prevent warm air infiltration, and the door design must encourage proper closure, including self-closing hinges and curtains over frequently accessed openings. Strip curtains over frequently used coolroom doors can reduce the heat infiltration from door opening cycles by a significant margin.
Floor drainage and non-slip surfaces. Coolroom floors require non-slip surfaces that are also easy to clean, and adequate drainage to manage condensation and cleaning water. The floor specification and drainage requirements need to be confirmed before the surrounding slab is poured, not retrofitted afterward.
Condensate management. Evaporator units produce condensate that must be discharged from the refrigerated space. Condensate drain routing needs to be planned before installation so that drains can be correctly positioned without interference with the coolroom structure.
Commercial Electricians in Food Business Refrigeration: Why the Integration Matters
Commercial refrigeration is fundamentally an electrical system. The refrigeration equipment itself, the monitoring and alarm systems, the lighting, and the control infrastructure all require properly designed and correctly installed electrical supply. The quality of that electrical infrastructure directly affects both the reliability of the refrigeration system and the safety of the facility.
The electrical requirements for a commercial food business refrigeration installation include several specific considerations that general commercial electrical practice does not always address.
Load calculation and switchboard specification. Commercial refrigeration equipment draws significant electrical load, particularly during startup when compressors are pulling maximum current. A switchboard that was not designed for the refrigeration load, or that does not include the correct protection devices for each refrigeration circuit, creates reliability problems and potentially safety issues. Experienced commercial electricians working in food business environments understand how to specify and install the electrical infrastructure that commercial refrigeration requires.
Circuit isolation for each refrigeration unit. Each major refrigeration unit should have its own dedicated circuit with appropriate overcurrent and fault protection. Shared circuits create situations where a fault in one unit can take down multiple coolrooms simultaneously.
Temperature monitoring and alarm wiring. A compliant food business requires documented temperature monitoring for all refrigerated storage. Temperature probes, data loggers, and remote alarm notification systems all require electrical installation. Planning the wiring for these systems at the same time as the refrigeration installation avoids the need to surface-run cable through a completed facility.
Lighting rated for low-temperature environments. Coolroom lighting must be rated for the temperature range of the specific application. Standard lighting is not appropriate for freezer environments and will fail prematurely. The luminaire specification for each cold storage area should be confirmed before installation.
Emergency response provisions. Large coolrooms should have internal emergency release mechanisms that allow a person who becomes trapped to exit. These mechanisms have electrical components that must be installed and tested as part of the commissioning process.
Commissioning and Testing Before Operations Begin
A commercial refrigeration installation that has not been properly commissioned is not ready for food storage, regardless of how well it appears to be working immediately after the refrigeration units are switched on.
Commissioning should include:
Pull-down test. The refrigeration system should be tested for its ability to bring the coolroom from ambient temperature to the target setpoint within an acceptable time frame, with a measured load representing typical product volume.
Temperature distribution mapping. The temperature should be measured at multiple points within the coolroom to confirm that the refrigeration unit is achieving uniform temperature distribution across the entire storage space, not just at the sensor location.
Door seal verification. Door seals should be verified against a documented standard, including a light test or thermographic inspection to identify any gaps.
Alarm system testing. All temperature alarms should be tested to confirm they trigger at the correct temperatures and that notifications reach the intended recipients.
Documentation of as-built conditions. The completed installation should be documented with as-built drawings, equipment data plates, maintenance access procedures, and commissioning records that form the baseline for ongoing compliance and maintenance.
Conclusion
Commercial refrigeration for a Perth food business that is designed correctly from the outset, integrating the refrigeration engineering, the electrical infrastructure, and the operational requirements of the business, performs reliably, costs less to operate, and supports regulatory compliance far more effectively than one where these elements are addressed sequentially or in isolation.
The time invested in thorough design before construction begins is the most leveraged investment available in the entire fit-out process. The decisions made on paper before the first slab is poured cost nothing to change. The same decisions after construction is underway can cost significantly more to correct.
Design it right the first time.
Comments