مخزنك المبرد يعمل بكفاءة. هل هو جاهز لمرحلة النمو التالية؟

Calculation method

1. 1. Storage duty (kW) = target pallets × kW/pallet (0.048 chilled · 0.060 pharma · 0.075 frozen · 0.115 deep)
2. 2. Throughput duty (kW) = target inbound pallets/day × pull-down factor (0.35 chilled · 0.30 pharma · 0.85 frozen/deep)
3. 3. Door duty (kW) = doors × (1 + throughput growth) × 6 kW
4. 4. New peak = storage + throughput + door duty; gap = peak − installed duty
5. 5. Utilisation = peak ÷ installed: > 115% upsizing likely · 85–115% review · < 85% may absorb growth

Inputs and results are in pallets and kW. Imperial equivalents: 1 kW = 3,412 BTU/h = 0.284 TR (tons of refrigeration).

Worked example

Frozen cold store growing from 10,000 to 18,000 pallets, inbound 220 → 380 pallets/day, 6 doors, 800 kW installed.

Inputs

• • Target 18,000 pallets
• • Inbound 380 /day (+73%)
• • 6 doors
• • Installed 800 kW (227 TR)

Calculation

• • 18,000 × 0.075 = 1,350 kW
• • 380 × 0.85 = 323 kW
• • 6 × 1.727 × 6 = 62 kW
• • Peak = 1,735 kW · gap = 935 kW · utilisation 217%

New peak ≈ 1,735 kW (≈ 493 TR · 5.9 million BTU/h) — plant upsizing or a second plant is very likely required.

Limitations

• • kW per pallet and pull-down factors are portfolio averages; intake temperature, packaging and dwell time change them materially.
• • Door load is a fixed 6 kW per door scaled by throughput — fast doors and airlocks can cut it sharply (see the door infiltration calculator).
• • Installed duty should be the real duty at design ambient, not nameplate; old plants often deliver well below nameplate.
• • The investment band is indicative and excludes land, grid upgrades and financing.

Illustrative planning result only. Confirm the final design, duty, equipment selection and performance with a qualified refrigeration engineer and supplier quotation.