Controlled Atmosphere — recipe & sizing

Tool · 07 of 07 · USDA Handbook 66

Step 1

Crop & storage target

Crop

Tonnage

tonnes

Storage target

months

Realistic CA storage life depends on crop variety + harvest maturity.

Step 2

Chamber sealing

Sealing tier

High (ULO)≤ 0.5%/day leak · gas-tight chamber Medium≤ 1.5%/day · refresh-cycle CA Modified AtmSealed bags / shrouds only

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CA Recipe — your crop

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Atmosphere targets

O₂

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CO₂

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N₂

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Storage temperature

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Chamber size required

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N₂ generator sizing

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PSA nitrogen generator. Sized for initial pull-down + leak make-up.

Storage life extension

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CA vs cold-only storage.

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Compute heat load on this CA chamber →

Show the math & references

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CA recipes from USDA Agriculture Handbook 66 and ASHRAE Refrigeration Ch. 25. Actual targets vary by cultivar, harvest maturity, and intended market. Initial commissioning requires a dedicated CA engineer + atmosphere monitoring. Multi-crop storage in one chamber is not supported — different crops need different recipes.