Impact of Cold Storage Structural Scheme Selection on Operations: A Full-Cost Comparative Framework

Impact of Cold Storage Structural Scheme Selection on Operations: A Full-Cost Comparative Framework

Data Note: All calculations are based on a reference scenario (20,000 m², 8-story cold storage) with assumed unit prices (rental rate, electricity cost) for illustrative purposes only. Actual project parameters vary significantly; these results do not constitute a return on investment guarantee. Please calculate based on specific project parameters.

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1. Structural Scheme: Not Just a Construction Phase Concern

In cold storage investment decisions, owners often focus on construction costs (land, construction, equipment) while overlooking the long-term operational impact of structural schemes. Structural scheme choice also drives 20-year operating costs: storage capacity, refrigeration energy and joint maintenance.

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2. Dimension 1: Effective Storage Capacity and Rental/Operating Revenue

Traditional small-span scheme (7–9m column spacing):
In a 20,000 m² building, columns occupy approximately 3%–5% of floor area, plus dead zones around columns for rack layout. Actual rackable area is about 75%–80% of gross floor area. Using industry-standard storage utilization metrics, effective storage area is approximately 15,000–16,000 m².

Large-span post-tensioned scheme (12m column spacing):
Column count reduced by over 60%, minimizing interference from columns and dead zones. Effective storage area increases to 90%–95% of gross floor area, yielding approximately 18,000–19,000 m² for the same 20,000 m² cold storage.

Reference scenario calculation example:

Effective storage area increases by about 3,000 m². Assuming a rental rate of 200 RMB/m²/month in East China (for illustrative purposes only, not a revenue guarantee):

• Annual incremental rental revenue: 3,000 m² × 200 RMB/m²/month × 12 months ≈ 7.2 million RMB/year
• 20-year cumulative reference: approximately 144 million RMB

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3. Dimension 2: Floor Height Savings and Refrigeration Energy Consumption

Floor height difference:
Compared to waffle slab systems, the post-tensioned flat slab significantly reduces structural depth on every floor. In a multi-story cold storage, total building height is reduced accordingly while maintaining the same clear floor height.

Refrigeration energy correlation:
Refrigeration energy consumption is positively correlated with internal volume. Reduced total height, with constant floor area, decreases internal volume. Less air volume to cool reduces refrigeration load. Considering unchanged envelope heat loss and reduced air volume, system energy consumption decreases accordingly.

How to estimate it:

• Annual electricity cost savings = annual refrigeration electricity consumption × energy-saving ratio × electricity price
• Life-cycle savings = annual savings × operating years

The energy-saving ratio depends on the number of stories, envelope thermal performance, refrigeration equipment efficiency, and other factors, and can be calculated with project-specific parameters.

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4. Dimension 3: Reduced Expansion Joints and Insulation System Savings

The large-span post-tensioned scheme, combined with joint-free design for lengths up to 120 m, eliminates expansion joints, removing double walls and double columns at joint locations.

For a 120 m long cold storage, eliminating one expansion joint saves (reference range):

• Structural materials for double columns and walls: approximately 500,000–800,000 RMB (depending on section sizes)
• Double-layer insulation walls at joint: approximately 200,000–400,000 RMB
• Long-term maintenance of joint sealants (10 years): approximately 100,000–200,000 RMB

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5. Full-Cost Comparison Framework Summary

For the reference 20,000 m², 8-story cold storage, 20-year lifecycle comparison:

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6. Practical Application of the Framework

BICP's iBLM TaiShu Cloud platform can generate full-cost comparisons from project parameters. Contact us for project consultation services.