How to Size an Industrial Freeze Dryer for Your Daily Output

Quick answer

To size an industrial freeze dryer, divide your daily wet input (kg) by the loading density (kg per m² of shelf) and by the number of batches you can run per day. Example: 2,000 kg/day of sliced fruit at 10 kg/m² with one 20-hour batch per day needs about 200 m² of shelf area — one QS-FD-200 or two QS-FD-100 units.

Key takeaways

Size by shelf area (m²), not by the 'kg' number in a listing title.
Loading density for sliced fruit is usually 8–12 kg/m²; liquids such as coffee extract can be higher.
Plan for one batch per 24 h for most fruit; faster products allow more batches.
Two medium units give redundancy; one large unit gives the lowest cost per kg.

The most common mistake we see in enquiries is choosing a freeze dryer from a single 'kg per batch' figure. That figure only holds for one product at one loading depth. The reliable way to size a machine is to work from shelf area.

Step 1 — Fix your daily wet input#

Start with the weight of prepared, ready-to-load product per day (after peeling, coring and slicing), not the weight of raw fruit at receiving. Trimming losses for pineapple or mango can be 30–50 %.

Step 2 — Choose a realistic loading density#

Product	Typical loading density	Typical cycle
Sliced fruit (strawberry, apple, mango)	8–12 kg/m²	18–24 h
Diced vegetables	8–10 kg/m²	16–22 h
Coffee or tea extract (slab)	10–14 kg/m²	20–28 h
Cooked meat, seafood	10–12 kg/m²	20–26 h
Freeze-dried candy	4–6 kg/m²	6–12 h

These are planning ranges. A lab or pilot test on your own product is the only way to confirm them, and we offer test runs before quotation.

Step 3 — Count batches per day#

Add the loading, unloading and defrost time to the drying cycle. For a 20-hour fruit cycle, one batch per day is realistic. For candy, three batches per 24 hours is possible.

Step 4 — Calculate shelf area#

Required shelf area (m²) = daily wet input (kg) ÷ loading density (kg/m²) ÷ batches per day.

Worked example: freeze-dried strawberry slices#

Daily prepared input: 1,000 kg
Loading density: 10 kg/m²
Batches per day: 1
Required shelf area: 1,000 ÷ 10 ÷ 1 = 100 m² → one QS-FD-100

Worked example: freeze-dried candy#

Daily input: 300 kg
Loading density: 5 kg/m²
Batches per day: 3
Required shelf area: 300 ÷ 5 ÷ 3 = 20 m² → one QS-FD-20

Step 5 — Match a model#

Model	Nominal shelf area	Wet load per batch (fruit)	Footprint (L×W×H, mm)
QS-FD-20	≈ 20 m²	200–300 kg	4500 × 1300 × 1400
QS-FD-100	≈ 100 m²	1,000–1,500 kg	7000 × 4000 × 2300
QS-FD-200	≈ 200 m²	2,000–3,000 kg	12000 × 4000 × 2300

One large unit or two smaller ones?#

One large chamber gives the lowest equipment and energy cost per kilogram. Two medium chambers give redundancy, allow staggered loading so your freezing and packing teams work steadily, and let you run two products at once. Many first-time plants start with one QS-FD-100 and add a second when sales grow.

Don't forget utilities#

Power: 380 V three-phase as standard; 220 V and other voltages on request.
Cooling: air-cooled or water-cooled condensing; water-cooled needs a cooling tower.
Space: allow at least 1.5 m service clearance around the chamber and refrigeration skid.
Pre-freezing: large plants often add a blast freezer so the chamber is used only for drying.

Want a quick estimate? Use the capacity estimator, then send us your product and daily target for an engineered proposal.

FAQ#

What size freeze dryer do I need for 1 tonne per day?

For sliced fruit at about 10 kg/m² and one batch per day, 1,000 kg/day needs roughly 100 m² of shelf area — a QS-FD-100 class machine.

Can I run more than one batch a day?

Yes, for fast-drying products such as freeze-dried candy or very thin slices. Most fruit runs one batch per 24 hours.

Is it better to buy one large or two small freeze dryers?

One large unit has lower cost per kg; two units give redundancy and flexibility. The right choice depends on your product mix and growth plan.