Cold storage ASRS energy savings

The Economics of Density: Reducing the “Cooled Volume”

The primary driver of energy waste in cold storage is the “honeycomb effect” found in traditional racking. When pallets are picked manually, partial lanes create pockets of air that must still be refrigerated. This is thermodynamically inefficient.

By implementing a High density pallet storage configuration, such as the starack-Shuttle system, we decouple the storage depth from the retrieval mechanism. The system utilizes a satellite shuttle that travels deep into the racking lane (up to 10-20 pallets deep), depositing loads with zero gaps. This structure allows you to store the same amount of inventory in 40% less volume compared to selective racking.

Furthermore, because the Automated Pallet Warehouse operates without human presence in the aisles, lighting can be eliminated (Lights-out operation), removing a significant heat source that otherwise adds load to your refrigeration compressors.

Regenerative Braking: Turning Gravity into Electricity

Moving 1,000kg pallets of frozen fish or pharmaceuticals requires significant energy, but physics offers a rebate mechanism. The starack system’s hoist motors act similarly to an electric vehicle’s regenerative braking system.

Structure: The lift motors are equipped with a Regenerative Braking Unit connected to the DC Bus.

Function: When the stacker crane lowers a heavy load from a height of 30 meters (approx. 98 feet), the potential energy is converted into kinetic energy. The motor acts as a generator during this descent, converting the counter-electromotive force back into electrical energy.

Value: This energy is immediately fed back into the grid to power the horizontal travel motors or other facility equipment. In a high-throughput Cold Chain distribution center, this feature alone can reduce the ASRS specific energy consumption by 20% to 30%, directly impacting the OpEx bottom line.

Rack Clad Construction: Superior Thermal Insulation

For new cold storage projects, the Rack Clad (Rack Supported Building) approach offers superior thermal integrity compared to installing racking inside a traditional warehouse shell.

In a Rack Clad Automated Pallet Warehouse, the racking itself serves as the structural skeleton of the building. The insulated wall panels and roof are attached directly to the rack uprights. This engineering method minimizes the building footprint and eliminates the need for massive structural columns that create thermal bridges (points where heat conducts into the freezer).

By reducing the surface area of the building envelope relative to the stored volume, thermal leakage is minimized, allowing your refrigeration plant to maintain -30°C with lower duty cycles.

Operational Integrity in Freezing Conditions

Beyond the physics of cooling, operational efficiency in cold chains is often hampered by human limitations. Working in -25°C requires heavy freezer suits, frequent warm-up breaks (often 15 minutes every hour), and results in high staff turnover. Furthermore, forklifts moving in and out of freezers cause condensation and ice buildup on floors, leading to wheel slippage and safety hazards.

The starack system utilizes Q355 high-strength steel that maintains structural ductility at low temperatures. All electronic components, including laser positioning systems and sensors, are rated for deep-freeze environments or equipped with heating elements to prevent fogging. By automating the internal movements, you create a stable, sealed environment where the doors only open for the product, not for the driver.

Frequently Asked Questions

Question	Answer
Can starack systems operate in -30°C (-22°F) environments?	Yes. We utilize cold-resistant steel grades and low-temperature lubricants for all mechanical bearings and gearboxes. Electrical cabinets are equipped with internal heating elements to prevent condensation and component failure.
How does ASRS prevent ice buildup on rails?	Unlike forklifts that drag humidity in from the loading dock, the Automated Pallet Warehouse operates in a sealed environment. We also use specific wheel materials (Vulkollan or steel) designed to maintain traction on cold rails, and the system creates zero exhaust moisture compared to propane forklifts.
What happens if a pallet collapses inside the freezer?	The system includes a Profile Gauge (contour detection) at the induction point to reject unstable loads before they enter. If a collapse occurs inside, manual entry is required, but our rigorous induction protocols reduce this risk to near zero compared to manual handling.
Is the Rack Clad structure cheaper than building a traditional freezer warehouse?	Generally, yes. By combining the rack and building structure, you eliminate duplicate steelwork and foundation costs. More importantly, the construction timeline is significantly shorter, allowing you to bring the cold storage facility online faster.
How much energy can I save compared to a manual warehouse?	Typical savings range from 30% to 50% on refrigeration energy costs. This is achieved through higher storage density (less volume to cool), minimized door openings (airlocks with conveyors), and the elimination of lighting and human-heat generation inside the freezer.