Deep freeze warehouse automation

In a -25°C environment, you are not just storing pallets; you are paying to cool every cubic inch of air surrounding them. Traditional forklift operations require wide aisles, forcing you to refrigerate 60% empty space. The starack system eliminates these aisles, doubling your storage density and slashing energy bills by reducing the total volume of air requiring thermal management.

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The Thermodynamics of High-Density Storage

The primary cost driver in frozen food manufacturing and cold chain logistics is not the building itself, but the Operating Expense (OpEx) of electricity required to maintain sub-zero temperatures. In a standard wide-aisle warehouse, the “honeycombing effect” results in massive pockets of cold air that generate no revenue.

Our approach utilizes Automated Pallet Warehouse technology to compress the storage footprint. By deploying the starack-Shuttle or multi-deep Stacker Crane systems, we remove the need for human access lanes.

Figure 1: High-density multi-deep storage minimizes air volume, directly reducing refrigeration loads.

Volumetric Efficiency vs. Cooling Load

By increasing storage density, the starack system creates a thermal mass of frozen product that helps stabilize the ambient temperature. The logic is simple: frozen fish or meat holds temperature better than empty air.

Implementing a High Bay Warehouse design allows you to build upwards rather than outwards. A smaller roof surface area and a smaller foundation footprint mean significantly less heat transfer from the external environment, reducing the workload on your refrigeration compressors.

Hardware Survival in Cryogenic Conditions

Standard steel becomes brittle at low temperatures, leading to structural risks under heavy loads. The starack system is engineered specifically for these hostile environments.

Metallurgy: We utilize Q355 High-Strength Steel for all structural components. Unlike standard Q235, Q355 maintains ductility and impact resistance even at -30°C.
Connection Logic: We employ a fully bolted structure rather than on-site welding. Welding in freezing temperatures can introduce micro-cracks due to rapid cooling; bolted connections eliminate this risk and provide superior vibration resistance.
Electronics Protection: All laser positioning systems and control cabinets are equipped with internal heating elements to prevent condensation and component failure.

Figure 2: Drive units and bottom rails engineered with cold-resistant lubrication and heating protocols.

Turning Gravity into Electricity: Regenerative Braking

In a cold storage facility, every watt of heat generated by equipment must be removed by the cooling system. Traditional braking resistors in cranes generate massive amounts of waste heat—a double penalty where you pay for the electricity to run the crane and then pay again to remove the heat it creates.

The starack AS/RS System features integrated Regenerative Braking Units. When the stacker crane lowers a 1,000kg pallet of frozen seafood from a height of 25 meters, the motor acts as a generator. This potential energy is converted back into electricity and fed into the DC bus to power the horizontal travel motors or returned to the grid.

The Result: Overall energy consumption is reduced by 20-30%, and the heat load inside the freezer chamber is minimized.

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Rack Clad Buildings: The Ultimate Insulation Strategy

For new cold chain projects, the Rack Clad construction method offers the highest thermal integrity. Instead of building a warehouse and putting racks inside, the racking itself supports the insulated wall and roof panels.

Figure 3: Rack Clad structures integrate insulation panels directly onto the racking, reducing thermal bridges.

This construction eliminates structural columns that act as “thermal bridges” conducting heat from the ground or roof into the freezer. It also maximizes the pallet positions per square meter of land, which is critical in high-land-cost industrial zones near ports or urban centers.

Comparison: Manual Forklift vs. Starack Automation

Operational Metric	Manual Forklift Operation	Starack Deep Freeze Automation
Space Utilization	40-50% (Wide aisles required for turning)	85-95% (Narrow aisles or channel storage)
Labor Conditions	High turnover; harsh -25°C environment; safety risks.	Zero entry; “Lights-out” operation; humans stay in warm zones.
Energy Impact	Frequent door openings for entry/exit cause thermal loss.	Airlock conveyor systems minimize air exchange.
Inventory Accuracy	Manual scanning errors; lost pallets.	100% WMS tracking; strict FIFO control for expiration dates.

Frequently Asked Questions

1. Can the system handle the condensation during in/out transitions?

Yes. We implement an “anteroom” or buffer zone strategy. Pallets are often wrapped or undergo a profile check in a temperature-controlled transition zone (0°C to 5°C) before entering the deep freeze (-25°C). This prevents rapid icing on the product and the conveyor mechanicals.

2. How do you perform maintenance in a -25°C environment?

The starack system is designed for high reliability to minimize entry. However, when maintenance is required, the stacker crane can be remotely driven to a “maintenance bay” at the end of the aisle, which can be isolated and warmed up, allowing technicians to work without freezer suits.

3. What happens if the power fails? Is the stock trapped?

We recommend backup generators for the cooling system as a priority. For the AS/RS, the system includes manual brake release protocols and emergency retrieval procedures to lower the carriage safely, preventing stock from being “stuck” at height.

4. Is fire suppression possible in a high bay freezer?

Absolutely. We integrate Oxygen Reduction Systems (ORS) which lower the oxygen level to a point where fire cannot ignite, eliminating the need for water sprinklers that would freeze and damage stock. Alternatively, dry pipe sprinkler systems can be integrated into the rack structure.

5. Does this system work for variable pallet sizes?

While standardization is best for automation, the starack system utilizes a Profile Gauge at the induction point. If your 3PL operation handles varying pallet heights, the WMS will automatically assign the pallet to a rack location with the appropriate vertical clearance, optimizing the “air” usage.