Project records

Cold room and blast freezing project case studies — cost, cooling load and energy

Six anonymised projects, three cold storage and three blast freezing, each shown the way a buyer has to evaluate them: the specification that was tendered, the cooling load broken down in kW, the annual energy figure, and the delivered CAPEX and OPEX.

In short

Across these records, cold rooms were delivered at roughly USD 318–621 per m³ and consumed 60–134 kWh/m³ per year, while blast freezing lines ran at 91–120 kWh per tonne frozen for CAPEX between USD 1.3M and 2.6M. Square metres are not a cooling load: product entry temperature, throughput and pull-down time changed the design duty far more than room volume did.

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Cold room and cold storage projects

Cold room / cold storage · Kenya · high ambient, weak grid

1,800 m³ chilled produce cold room — East Africa

Horticulture exporter consolidating field-packed produce before airfreight. Two chilled rooms plus a small staging dock, operating 20 hours a day in peak season.

Specification

Volume: 1,800 m³ (2 rooms)
Room temperature: +2 °C
Ambient design: 34 °C dry bulb / 60% RH
Panel: 100 mm PUR, U ≈ 0.22 W/m²K
Daily throughput: 38 t/day, product in at 26 °C
Pull-down target: Product to +4 °C within 12 h

Cooling load build-up

Transmission (walls, roof, floor): 17 kW
Product cooling38 t/day from 26 °C to 2 °C over 12 h, cp 3.9 kJ/kg·K: 74 kW
Respiration heat: 6 kW
Infiltration (doors, dock): 13 kW
Fans, lights, people, forklifts: 11 kW
Safety margin (10%): 12 kW

133 kW design duty (evap −5 °C)

Energy

Installed compressor power: 44 kW
Annual consumption: ≈ 232,000 kWh/yr
Specific energy: ≈ 129 kWh/m³·yr
Tariff / energy cost: USD 0.19/kWh → ≈ USD 44,000/yr
Backup: 180 kVA genset, ≈ 610 h/yr run time

Cost (indicative)

Envelope, panels, doors: USD 176,000
Refrigeration plant & pipework: USD 268,000
Electrical, controls, monitoring: USD 74,000
Genset & switchgear: USD 61,000
Install, commissioning, contingency: USD 96,000
Delivered CAPEX: USD 675,000 (≈ USD 375/m³)
Annual OPEX: ≈ USD 78,000 (energy, service, spares)

What moved the numbers

Product load was 56% of the total duty — floor area alone would have undersized the plant by roughly half.
Cutting product entry temperature from 26 °C to 20 °C with shaded field staging removed ~18 kW of duty at no equipment cost.
Two bids differed by 21% only because one assumed 8 h pull-down and the other 16 h; they were not comparable until the brief fixed the pull-down time.

Cold room / cold storage · Poland · temperate, stable grid

6,500 m³ frozen distribution store — Central Europe

Third-party logistics operator adding a −24 °C frozen chamber to an existing chilled distribution centre, with 14 dock doors and high pallet turnover.

Specification

Volume: 6,500 m³
Room temperature: −24 °C
Ambient design: 32 °C summer / −15 °C winter
Panel: 180 mm PIR, heated floor slab
Throughput: ≈ 120 pallets/day, product already frozen
Refrigerant: NH₃/CO₂ cascade, low charge

Cooling load build-up

Transmission: 38 kW
Product (already at −20 °C): 9 kW
Infiltration through dock doors: 21 kW
Fans and defrost: 26 kW
Floor heating and lighting: 7 kW
Safety margin (10%): 10 kW

111 kW design duty (evap −32 °C)

Energy

Installed compressor power: 72 kW
Annual consumption: ≈ 391,000 kWh/yr
Specific energy: ≈ 60 kWh/m³·yr
Tariff / energy cost: EUR 0.16/kWh → ≈ EUR 63,000/yr
Efficiency measures: EC fans, on-demand defrost, rapid doors, air curtains

Cost (indicative)

Envelope and racking-ready fit-out: USD 690,000
NH₃/CO₂ cascade plant: USD 980,000
Dock doors, air curtains, floor heating: USD 215,000
Controls, monitoring, electrical: USD 180,000
Delivered CAPEX: USD 2.07M (≈ USD 318/m³)
Annual OPEX: ≈ USD 128,000

What moved the numbers

In a frozen store with no product pull-down, infiltration plus fans and defrost were 42% of the duty — door discipline was worth more than extra insulation.
Cascade CO₂ carried a 12% CAPEX premium over HFC but cut annual energy by roughly 19%, giving a payback under five years at the local tariff.
Specific energy per m³ is far lower than a small cold room because the surface-to-volume ratio improves with scale.

Cold room / cold storage · UAE · very high ambient, GDP validated

900 m³ GDP pharma cold room — Gulf

Pharmaceutical distributor building a +2 to +8 °C validated chamber with full redundancy, mapping and documented qualification.

Specification

Volume: 900 m³
Room temperature: +5 °C ± 3 K
Ambient design: 46 °C dry bulb
Redundancy: N+1 refrigeration, dual power feeds, UPS on controls
Compliance: GDP, temperature mapping, IQ/OQ/PQ

Cooling load build-up

Transmission at 46 °C ambient: 14 kW
Product (low turnover, pre-conditioned): 5 kW
Infiltration and airlock: 6 kW
Fans, lights, monitoring: 5 kW
Safety margin (15%, validated room): 5 kW

35 kW design duty per circuit, N+1

Energy

Installed compressor power: 2 × 13 kW (duty/standby rotating)
Annual consumption: ≈ 121,000 kWh/yr
Specific energy: ≈ 134 kWh/m³·yr
Tariff / energy cost: USD 0.09/kWh → ≈ USD 11,000/yr

Cost (indicative)

Envelope, airlock, doors: USD 143,000
N+1 refrigeration plant: USD 262,000
Monitoring, alarms, UPS, BMS integration: USD 96,000
Validation (mapping, IQ/OQ/PQ, documents): USD 58,000
Delivered CAPEX: USD 559,000 (≈ USD 621/m³)
Annual OPEX: ≈ USD 46,000 incl. requalification

What moved the numbers

Cost per m³ is ~65% higher than a food chilled room of similar size — redundancy and validation, not cooling, drive the difference.
Two of five bidders excluded validation from scope; normalising the RFQ moved the cheapest bid to third place.
At 46 °C ambient the condenser selection changed annual energy by ~14% between two otherwise similar offers.

Blast freezing and IQF projects

Blast freezing · Vietnam · export processing

2.5 t/h shrimp IQF spiral freezer — Southeast Asia

Seafood exporter replacing trolley blast rooms with a continuous IQF spiral to meet EU and Japanese buyer specifications on freezing rate and yield.

Specification

Throughput: 2,500 kg/h
Product in / out: +8 °C → −18 °C core
Air temperature: −38 °C, 4–6 m/s over product
Retention time: ≈ 22 min
Refrigerant: NH₃ pumped recirculation

Cooling load build-up

Sensible cooling +8 → −1 °C: 26 kW
Latent heat of freezing≈ 235 kJ/kg at 2,500 kg/h: 163 kW
Sensible cooling −1 → −18 °C: 35 kW
Belt, fans and drive heat: 48 kW
Infiltration and defrost: 19 kW
Safety margin (10%): 29 kW

320 kW design duty (evap −42 °C)

Energy

Installed compressor power: 285 kW
Annual consumption: ≈ 1.48 GWh/yr at 6,000 h
Specific energy: ≈ 99 kWh per tonne frozen
Tariff / energy cost: USD 0.08/kWh → ≈ USD 118,000/yr
Yield gain vs trolley blast: ≈ 1.1% less dehydration loss

Cost (indicative)

Spiral freezer and enclosure: USD 1.32M
NH₃ plant, evaporators, pipework: USD 810,000
Electrical, controls, hygiene fit-out: USD 240,000
Install and commissioning: USD 190,000
Delivered CAPEX: USD 2.56M
Annual OPEX: ≈ USD 205,000

What moved the numbers

Latent heat was 51% of the duty — freezing warm product and holding frozen product are entirely different refrigeration duties.
Two suppliers quoted the same tonnage at different exit core temperatures (−15 °C vs −18 °C); the cheaper machine was roughly 18% smaller in real duty.
Yield recovery from reduced dehydration was worth more per year than the entire energy bill difference between the shortlisted machines.

Blast freezing · Brazil · meat processing

1.2 t/h horizontal plate freezer line — South America

Beef processor adding carton and block plate freezing ahead of a −25 °C export store, replacing an overloaded blast tunnel.

Specification

Throughput: 1,200 kg/h in cartons
Product in / out: +4 °C → −18 °C core
Cycle time: ≈ 4.5 h per station
Contact medium: Plate freezing, −35 °C brine-free direct NH₃

Cooling load build-up

Sensible cooling +4 → −1.5 °C: 9 kW
Latent heat of freezing: 84 kW
Sensible cooling −1.5 → −18 °C: 17 kW
Packaging and hardware load: 6 kW
Infiltration, hydraulics, defrost: 11 kW
Safety margin (10%): 13 kW

140 kW design duty (evap −38 °C)

Energy

Installed compressor power: 118 kW
Annual consumption: ≈ 566,000 kWh/yr at 5,200 h
Specific energy: ≈ 91 kWh per tonne frozen
Tariff / energy cost: USD 0.11/kWh → ≈ USD 62,000/yr
Vs air-blast alternative: ≈ 22% lower kWh/t, faster cycle

Cost (indicative)

Plate freezer stations: USD 620,000
NH₃ plant and pipework: USD 430,000
Handling, hydraulics, electrical: USD 185,000
Install, commissioning, training: USD 105,000
Delivered CAPEX: USD 1.34M
Annual OPEX: ≈ USD 104,000

What moved the numbers

Plate freezing beat air blast on energy per tonne because contact heat transfer removed most of the fan load.
The bottleneck was not the plant but carton loading; the tender scope had to include handling to hit the stated tonnage.
Freezing capacity was sized against seasonal peak, not annual average — a 14% throughput swing decided the station count.

Blast freezing · Germany · industrial bakery

800 kg/h bakery spiral blast freezer — Western Europe

Bakery freezing part-baked goods before frozen distribution, with crust-quality constraints limiting air velocity and freezing rate.

Specification

Throughput: 800 kg/h
Product in / out: +22 °C → −18 °C core
Air temperature: −34 °C, controlled velocity
Retention time: ≈ 55 min
Refrigerant: CO₂ cascade, indoor plant room

Cooling load build-up

Sensible cooling +22 → −3 °C: 22 kW
Latent heat of freezing: 36 kW
Sensible cooling −3 → −18 °C: 9 kW
Belt, fans, drives: 23 kW
Infiltration and defrost: 8 kW
Safety margin (10%): 10 kW

108 kW design duty (evap −40 °C)

Energy

Installed compressor power: 96 kW
Annual consumption: ≈ 452,000 kWh/yr at 4,700 h
Specific energy: ≈ 120 kWh per tonne frozen
Tariff / energy cost: EUR 0.21/kWh → ≈ EUR 95,000/yr
Heat recovery: ≈ 140 MWh/yr reused for proofing and hot water

Cost (indicative)

Spiral freezer: USD 780,000
CO₂ cascade plant: USD 520,000
Heat recovery and integration: USD 130,000
Electrical, controls, install: USD 210,000
Delivered CAPEX: USD 1.64M
Annual OPEX: ≈ USD 141,000 net of heat recovery

What moved the numbers

Product quality limits capped air velocity, so the freezer is longer and slower than a seafood machine at similar tonnage.
Fan and belt heat was 21% of the duty — machine geometry, not just refrigerant choice, drives energy per tonne.
Heat recovery cut net operating cost by roughly 18% and was only possible because the plant room sat inside the building.

Buyer questions answered by these projects

How much does a cold room or blast freezer project actually cost?

In these records, chilled and frozen cold rooms landed between roughly USD 318 and 621 per m³ delivered, and blast freezing lines between USD 1.3M and 2.6M for 0.8–2.5 t/h. Cost per m³ falls as volume rises, and climbs sharply where redundancy, validation or backup power is required — a validated pharma room costs more per m³ than a larger food store at the same temperature.

Why do two cold rooms of the same size need different cooling loads?

Because the load is the heat that must be removed, not the floor area. In the East African produce room, product cooling was 56% of the duty; in the frozen distribution store, where product arrives already frozen, product load was under 10% and infiltration, fans and defrost dominated. Entry temperature, throughput, pull-down time, ambient conditions and door traffic change the answer far more than volume does.

How much energy does a cold store or freezer use per year?

The frozen distribution store ran at roughly 60 kWh/m³·yr, the smaller chilled and pharma rooms at 129–134 kWh/m³·yr, because surface-to-volume ratio improves with scale. Blast freezing is better measured per tonne frozen: 91–120 kWh/t across the plate, spiral and bakery lines here, driven by latent heat, fan power and exit core temperature.

What is the difference between cold storage and blast freezing duty?

Maintaining frozen product and freezing warm product are different refrigeration duties. Storage duty is mostly transmission, infiltration and fan heat. Freezing duty is dominated by latent heat — 51% of the total in the shrimp IQF line — and needs much lower evaporating temperatures, which cuts compressor efficiency and raises installed power for the same tonnage.

Why did bids for the same project differ so much?

Almost always because the design assumptions differed, not the equipment. Bids diverged 21% on pull-down time, 18% on exit core temperature and moved rank entirely once validation scope was normalised. Two refrigeration quotations are not comparable until their assumptions are comparable, which is what a structured RFQ brief fixes.

Cold room cost guide Blast freezer systems Market project case studies All case studies All guides

All projects are anonymised and generalised. Cooling loads, energy figures and costs are indicative planning-grade values from comparable ColdMatch Group project briefs — they are not quotations, engineering designs or guaranteed outcomes. Every real project must be verified by a qualified refrigeration engineer before procurement.

Supplier and manufacturer listings are provided for research, transparency and discovery only. ColdMatch Group does not provide automatic buyer-supplier introductions. Every cold chain project request is reviewed manually by David / ColdMatch Group, and supplier introductions are made only after internal approval.