How is chiller capacity sized for a food plant?

Consider hourly product throughput, inlet and outlet temperatures, specific heat and the time allowed for cooling. Add tanks, exchangers, pipework, pumps, CIP cooling and ambient heat gains. Account for simultaneous processes and, in freezing applications, the latent heat removed during phase change.

How much chiller capacity is needed to cool milk?

Use hourly milk mass × 3.9 kJ/kg·K × temperature difference ÷ 3,600. Cooling 5,000 litres per hour from 35 °C to 4 °C gives an average load of about 168 kW. If a pasteuriser regenerates 85–90% of the heat, the chiller serves only the final cooling stage and the load is much lower.

Can food product flow directly through a chiller?

Keep product and chiller circuits separate. Pass the product through a hygienic heat exchanger designed to EHEDG principles, with water or water-glycol on the chiller side. This avoids product contact with the chiller, pumps and utility pipework and supports safer cleaning and fluid control.

Which glycol should be used in food plants?

Use food-grade propylene glycol in circuits where contact with product is possible; ethylene glycol may be used in fully isolated condenser and auxiliary circuits. Set concentration for the minimum fluid temperature; a typical chilled-water circuit uses 25–30%. Closed circuits above freezing with no freeze risk may use water without glycol.

What cooling-water temperature is needed?

Typical ranges are 0.5–2 °C for ice-water circuits, 1–2 °C for final pasteurisation cooling, 6–12 °C for general process and CIP cooling, and 15 °C or above for auxiliaries. Water that is colder than necessary increases energy use and can cause freezing. Separate circuits and use the highest safe temperature each process permits.

Is N+1 redundancy needed in a food plant?

N+1 redundancy is recommended where cooling failure could cause major product loss or production stoppage. Stored ice in an ice-bank plant can provide several hours of backup and may reduce the chiller standby capacity needed. Decide using product value, acceptable downtime, maintenance plans and critical load.

Can free cooling serve low-temperature processes?

Yes, if outdoor air and returning process fluid have enough temperature difference. Full free cooling is limited for ice-water circuits. Greater benefits may come from dry-cooler circuits after pasteuriser heat regeneration, for CIP cooling and for auxiliary loads. Use hourly climate data and approach temperatures to assess performance.

Is full-load COP enough to select a chiller?

No. Food-production loads vary during the day and across seasons. Assess part-load efficiency, compressor staging, minimum capacity and fan and pump energy. Estimate annual electricity cost from the plant’s actual load profile rather than one nominal COP value.

How should process temperature be recorded?

Monitor temperature, pressure and flow sensors at critical points through the control system. Keep time-stamped inlet and outlet temperatures, tank temperatures, pump status and alarm history. Retain records for temperature points defined as CCPs in the HACCP plan for ISO 22000 and BRCGS audits and for energy analysis.

Food & Beverage Process Cooling & Chiller Systems

Sector Overview & Process Demands

A food and beverage process cooling system combines chillers, dry coolers and controls to supply post-pasteurisation cooling, fermentation, filling and freezing processes with chilled water (0.5–2 °C), process water or food-grade glycol. A hygienic heat exchanger separates the utility circuit from the product. Carnot designs each system for the facility, from product-load calculations to HACCP-compatible fluid selection.

Cooling is central to product safety, process stability, shelf life and production capacity in food and beverage manufacturing. If product temperature cannot be reduced within the required time, microbiological risk can rise, quality can fall, process time can increase and the production line can slow down.

Carnot develops central and process-level cooling systems for dairy, beverages, brewing, ice cream, meat processing, bakery production and other food processes. Chillers, dry coolers, free cooling, pump and tank groups and controls maintain the required water temperature, flow rate and cooling capacity as production loads change.

Critical Operational Requirements

Why Is Process Cooling Important in Food Production?

Food plants need controlled heat transfer at many stages, not only lower room-air temperature. It is needed from raw-material intake through mixing and cooking to rapid product cooling, filling and storage. A properly engineered process cooling system supports these steps.

Reduces product temperature in the targeted time.
Keeps production recipes repeatable.
Keeps heat exchangers operating at stable temperatures.
Protects product quality and shelf life.
Reduces waiting times in the production line.
Prevents capacity loss during intensive production periods.
Provides seamless cooling in critical processes.
Keeps energy and water consumption under control.

Which Food and Beverage Processes Are Served?

Typical process temperatures include raw-milk storage at 4 °C (the Turkish Food Codex calls for cooling below 6 °C within two hours after milking), post-pasteurisation cooling to 4 °C, beer fermentation at 8–14 °C and cold conditioning at −1 to 0 °C, beverage carbonation at 2–4 °C, chocolate tempering at 27–32 °C, ice-cream freezer discharge at −5 °C and hardening at −30 to −40 °C, and carcass chilling below 7 °C within 24 hours. Each process differs in product temperature, timing, fluid and hygiene requirements. Size the plant from the heat removed at each stage, not total production volume alone.

Raw milk cooling and milk products production
Yogurt, ayran and cheese processes
Ice-cream production and hardening lines
Fruit juice and carbonated-beverage production
Bottling and filling lines
Beer, wine and fermentation processes
Meat, poultry and fish processing plants
Chocolate and confectionery production
Bakery and flour-based food production
Vegetable-oil production
Sauce, tomato-paste and canned-food production
After cooking product cooling
Chilled-water and glycol circuits
Line and tank cooling after CIP
Cold room and auxiliary cooling systems

System Design & Capacity Calculation

Engineering & Sizing Criteria

How Is a Food Process Cooling System Designed?

Assess product properties, production schedule and critical process temperatures together. In addition to the product load, include tanks, heat exchangers, pumps, pipework, ambient heat gains, CIP cycles and auxiliary equipment.

Design Parameter	Engineering Significance
Product inlet and outlet temperature	Determines the heat to be removed from the product.
Hourly production capacity	Determines instantaneous and total cooling load.
Specific heat of the product	Changes the cooling load of different products in the same quantity.
Cooling time	Determines the required instant chiller capacity directly.
Freezing or phase change	Requires a latent-heat calculation in addition to sensible heat.
Daily load profile	Guides how capacity is divided between ice storage and the chiller.
Process fluid temperature	Determines chiller operating conditions and energy efficiency.
CIP program	Affects post-CIP cooling peaks and capacity planning.
Flow and pressure loss	Determines pump selection and exchanger performance.
Minimum and maximum load	Determines compressor stepping and partial load efficiency.
Redundancy requirement	Maintains cooling on critical production lines.
Hygiene and fluid separation	Keeps the product circuit safely separate from the utility cooling circuit.

Capacity Calculation & Thermodynamic Formula

How Is Product Cooling Capacity Calculated?

The capacity needed to cool a product from its initial temperature to the target temperature is calculated using the following basic equation:

Q = m × cp × ΔT

Q (kW) = [m (kg/h) × cp (kJ/kg·K) × ΔT (°C)] / 3.600

Worked Engineering Example

Here Q is heat to be removed, m is product mass, cp is product specific heat and ΔT is the inlet-to-outlet temperature difference. Divide total energy by the allowed cooling time to find instantaneous capacity. For example, cooling 5,000 litres of milk per hour from 35 °C to 4 °C gives Q = 5,000 × 3.9 × 31 ÷ 3,600 ≈ 168 kW. For the water loop, Q (kW) = 1.163 × Flow (m³/h) × ΔT (°C); at 80 m³/h and 4 °C, Q = 1.163 × 80 × 4 = 372.16 kW. Freezing also requires latent heat for the water in the product (334 kJ/kg). In ice cream with 60–70% water, that latent load can be several times the sensible load per unit mass. Account for product composition, freezing point and required process time. Typical food-product specific heat values are listed in the table below.

The theoretical heat load carried by this water circuit is approximately 372 kW. Final chiller selection also includes heat gains from tanks and pipework, simultaneous processes, cleaning cycles and load changes.

Sector Reference Data

Product Specific Heat Values

Product	Specific heat (kJ/kg·K)
Water (reference)	4.186
Fruit juice, beer, soft drinks	3.8–4.0
Milk	3.9
Yogurt, Ayran	3.7
Meat, poultry (unfrozen)	2.9–3.2
Vegetable oil	2.0
Chocolate	1.6

Energy Optimization

Share your production schedule to compare direct chilled-water supply with an ice-bank arrangement.

Energy Consumption & Annual Operating Cost Analysis

750 kW Dairy & Beverage Plant Annual Energy Simulation

Theoretical full-load comparison for an example food processing plant with 750 kW cooling demand operating 6,000 hours/year.

Scenario comparison table

750 kW Dairy & Beverage Plant Annual Energy Simulation
System	COP	Compressor power	Annual consumption
Reference chiller system	4.50	166.7 kW	1,000,200 kWh
High-efficiency Carnot system	5.75	130.4 kW	782,400 kWh
Theoretical saving / difference	—	36.3 kW	217,800 kWh (21.7%)
Annual cost advantage	—	€0.12/kWh	Approximately €26,100

Annual compressor electricity consumption (kWh/year)

Annual Electricity Savings

217,800 kWh

21.7% theoretical reduction in compressor use

Annual Cost Advantage

~26,100 €

Calculated at €0.12/kWh reference electricity rate

Theoretical Power Difference

36.3 kW

Reference COP 4.50 / Carnot COP 5.75

Note: This calculation compares compressor power at 6,000 hours of full load. Actual annual savings will depend on plant load profiles, process temperatures, pump and fan modulation, local weather data, and economizer hours.

Engineering & Sizing Checklist

Let’s Design the Cooling System for Your Food Process

Carnot engineers the full system for your process, from product-load calculations and chiller, exchanger and hydraulic-equipment selection to integration with an existing ice bank, controls and annual energy analysis. The information below is enough for an initial review:

1Product and process type
2Hourly production volume and daily schedule
3Product inlet and target outlet temperatures
4Required cooling time
5Process water, ice water or glycol temperatures
6Flow and pressure need
7CIP program and frequency
8Daily and annual working time
9Electricity tariff (day/night)
10Facility location
11Current cooling system and ice bank information
12Critical processes and redundancy needs

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Related products

Technical Questions About Food & Beverage Cooling Systems

Detailed engineering answers on system sizing, capacity calculations, water temperatures, and Carnot equipment.

If load is concentrated in a few hours, such as morning milk reception, wort cooling or a filling shift, an ice bank lets the chiller be sized closer to average rather than peak load and may use off-peak electricity. For a steady load, a direct glycol chiller is more efficient because making ice operates at 20–25% lower COP than producing +1 °C chilled water. Carnot chillers can support either arrangement; the ice bank is supplied separately by the facility.

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By analyzing your process and operational data against engineering criteria, we determine capacity, system configuration, and implementation details. Let's turn your technical requirements into the right equipment selection and an actionable system design.

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Process Cooling Systems for the Food and Beverage Industry