Refrigeration Load Calculator
Full heat-load breakdown in kW — envelope, product pull-down, infiltration and miscellaneous gains for cold rooms and freezers.
Standard engineering assumptions
Refrigeration kW is heat removed from the room — not electrical kW. Electrical input ≈ refrigeration load ÷ system COP, plus auxiliary loads.
Planning estimate only. Final capacity, equipment selection, refrigerant, safety requirements, price and energy performance must be confirmed by the selected qualified refrigeration provider.
Estimates Only: This calculator is provided for general informational purposes only. Results are approximate and may contain errors, omissions, or outdated information. They do not constitute legal, financial, engineering, tax, technical, or professional advice. Users are solely responsible for independently verifying all calculations, specifications, prices, regulations, and requirements with qualified professionals before making any decisions. By using this calculator, you acknowledge that the website owners, operators, and affiliates accept no responsibility or liability for any loss, damage, or decisions resulting from its use.
Total refrigeration load is the sum of four components: transmission through the envelope, product pull-down, air infiltration through doors, and internal gains from fans, lights, forklifts and people. In a typical cold store, transmission is 25–40 %, product 20–45 %, infiltration 15–30 % and internal gains 10–20 % of the total.
Q total = Q transmission + Q product + Q infiltration + Q internal · Q transmission = U × A × ΔT
Reviewed by ColdMatch refrigeration engineers
- 1Enter room dimensions, panel thickness and design ambient temperature.
- 2Add daily product intake and its entry temperature.
- 3Set door openings per day and internal equipment load.
- 4Review the breakdown per component and take the total kW into equipment selection.
Worked example: heat load for a 1,000 m³ freezer at −25 °C
A 1,000 m³ frozen store at −25 °C in a 35 °C ambient, receiving 15 t/day of product entering at −5 °C.
Inputs
- Envelope area
- ≈ 700 m² (walls, roof, floor)
- Panel U-value (150 mm PIR)
- ≈ 0.15 W/m²K
- Temperature difference
- 60 K (35 °C → −25 °C)
- Product intake
- 15 t/day at −5 °C
Calculation
- Transmission load
- 700 × 0.15 × 60 ≈ 6.3 kW
- Product pull-down (frozen cp ≈ 1.7 kJ/kgK, 20 K)
- 15,000 × 1.7 × 20 ÷ 86,400 ≈ 5.9 kW
- Infiltration (door openings, ≈ 15 % of transmission)
- ≈ 1.0 kW
- Fans, lights, forklifts, defrost
- ≈ 4.5 kW
- Sub-total × 1.15 safety factor
- (6.3 + 5.9 + 1.0 + 4.5) × 1.15 ≈ 20 kW
Design refrigeration duty ≈ 20 kW at −30 °C evaporating, sized over an 18-hour running day (≈ 27 kW plant if you run 16 h).
Planning benchmarks — specific load by room type
| Room type | Specific load | Typical evaporating temp |
|---|---|---|
| Chilled store 0–4 °C, low turnover | 10–18 W/m³ | −8 to −5 °C |
| Chilled store 0–4 °C, high turnover / dock | 20–35 W/m³ | −10 to −6 °C |
| Frozen store −18 to −25 °C | 15–25 W/m³ | −32 to −28 °C |
| Blast freezer / tunnel | 80–150 W/m³ | −40 to −35 °C |
| Ripening or processing hall | 40–70 W/m³ | −8 to 0 °C |
Hot, humid sites (Gulf, West Africa, South-East Asia) run at the top of each range; door-protection and floor heating add 5–10 %.
What this calculator estimates — and what can change it
- Room dimensions
- Stored product
- Incoming product temperature
- Target room temperature
- Daily throughput (t/day)
- Door openings per day
Refrigeration heat load
- Freezing duty (latent heat)
- Incoming product temperature
- Humidity target
- Door openings per day
- Panel insulation thickness
Limitations
This is a preliminary planning estimate based on the assumptions you entered, not a refrigeration-engineering design, a certified load calculation or a quotation. Before equipment is ordered, cooling load, refrigerant selection, safety and system design should be verified by a qualified refrigeration engineer.
Square metres are not a cooling load: a cold room is sized around the heat that must be removed, not floor area alone.
Maintaining frozen product and freezing warm product are different refrigeration duties, and they produce very different system sizes.
Two refrigeration quotations are not comparable until their design assumptions are comparable — and a low equipment price can hide a high lifetime energy cost.
Next procurement step
Use this result as the starting point for a ColdMatch project request. Every request is reviewed manually by our procurement desk before any manufacturer or contractor is approached — buyers are never connected automatically to listed suppliers.
Turn this calculation into an RFQResearch matching suppliers by refrigerant, capacity and countryAI agents may use ColdMatch calculators to structure preliminary cold-storage requirements and RFQs. Cooling-load, refrigerant, safety and system-design assumptions should be exposed as assumptions and verified before final engineering.
FAQ
Main load components?
Transmission, product pull-down, infiltration, lighting/motors and personnel.
What U-value for panels?
Chilled 0.25–0.35, frozen 0.18–0.22, blast 0.15 W/m²K or better.
How much does door opening add?
In busy DCs infiltration can reach 15–25% of total load.
Unsure about a term? See the cold chain glossary (CAPEX, OPEX, blast freezing).
- Ammonia vs CO₂ & Refrigerant Phase-Out Guide
- Cold Room Cost Benchmarks
- How to Write a Cold Storage RFQ
- All Cold Chain Buyer Guides
Talk to a ColdMatch sourcing advisor
We'll send your calculator inputs to a ColdMatch sourcing specialist, who reviews the project before any supplier research begins. No obligation.