Views: 0 Author: Site Editor Publish Time: 2026-08-20 Origin: Site
Most food factories use air‑cooled unit coolers, yet water‑cooled fin fan coolers (water‑cooled dry cooler) gain growing adoption for large‑scale packaged food rapid‑chilling projects (gravy pouches, mashed potato, vacuum seafood). Instead of rejecting heat directly to ambient air, this cooler uses circulating water/glycol as intermediate medium. It connects to evaporator coils inside rapid‑chill cold rooms, works with CO₂ transcritical or conventional refrigeration systems, and performs well in high‑temperature, dusty, or noise‑restricted food plant zones. This article covers key design considerations, material selection, system matching and typical configuration for food‑grade water‑cooled fin fan coolers.
1. Core Working Principle
The water‑cooled fin fan cooler acts as the heat rejection side of the secondary cooling loop.
Warm glycol‑water mixture absorbs heat from the stainless‑steel evaporator inside the rapid‑chilling cold room for bagged food.
Hot working fluid flows into the tube‑fin coil of the water‑cooled fin fan cooler.
Axial fans force ambient air across fin surfaces to take away heat; cooled fluid circulates back to indoor evaporators.
Note: It is an air‑to‑liquid dry cooler, no water spray, no fill media, different from evaporative cooling towers. Zero water splash risk, fully compliant with food‑plant hygiene requirements.
2. Critical Design Specifications for Food Processing Conditions
2.1 Heat Exchange Coil Design
Tube material:
Standard: 304 stainless steel seamless tube.
Upgrade option: 316L stainless steel, for coastal food plants or sites with salt‑laden air and chemical cleaning vapors.
For high‑pressure CO₂ indirect circuit: design pressure up to 1.6–2.5 MPa.
Fin: Hydrophilic coated aluminum fin; corrugated fin for enhanced turbulence. Fin spacing 2.5‑4 mm, anti‑dust clogging for factory workshop environment.
Tube‑fin connection: Mechanical expansion, tight contact, avoid gaps for dirt accumulation.
Medium: Glycol‑water mixture (ethylene / propylene glycol), typical concentration 30‑50% for anti‑freezing, matched with food‑grade glycol for food‑safety sites.
2.2 Fan System Design
Axial fans with IP54 / IP55 waterproof motor, suitable for outdoor or semi‑outdoor plant installation.
VFD variable‑frequency fan configuration (highly recommended). Automatically adjust fan speed according to return‑water temperature. Reduce power consumption in low‑ambient seasons; prevent over‑cooling of the circulation loop for stable rapid‑chilling performance for gravy, mashed potato and seafood bags.
Fan guard standard fitted to avoid foreign object damage.
2.3 Cabinet & Drainage Design
Shell: Hot‑dip galvanized steel or full SUS304 stainless steel. Full stainless steel preferred for coastal food factories.
Sloped drain pan for possible condensate discharge; drain port reserved.
Mounting frame: Galvanized or stainless‑steel support frame for rooftop or ground installation.
2.4 Thermal‑hydraulic Design Parameters
Design ambient temperature: Based on local maximum summer dry‑bulb temperature (key for overseas project quotation).
Inlet / outlet water temperature: Typical 45℃ in → 35℃ out for food rapid‑chilling secondary loop.
Allowable water‑side pressure drop: ≤ 0.08 MPa, to lower pump energy consumption.
Heat capacity: Customized by customer daily food output and cold‑room total cooling load.
3. System Matching Notes (with indoor stainless steel evaporator)
Matched indoor unit: Stainless‑steel tube aluminum fin evaporator for packaged‑food fast chilling, supports both DX direct‑expansion and flooded CO₂ refrigeration layout.
Secondary loop circulation pump: Select correct flow rate & head, filter installed to prevent coil clogging.
Expansion tank: Compensate volume change of glycol‑water solution.
Anti‑freezing logic: In cold winter, VFD fans reduce speed; auxiliary electric heater optional for extremely cold regions.
Filter: Water‑side strainer to block impurity from food‑plant circulating water, protect fin‑tube coil.
4. Main Advantages in Food‑Processing Application
Stable cooling performance under high summer ambient temperature. Unlike air‑cooled refrigeration units with capacity drop in hot weather, water‑cooled fin fan solution guarantees fast pull‑down for bagged gravy, mashed potato and vacuum seafood, shorten high‑temperature bacterial‑risk period.
Low noise: Fans can be installed far away from production workshop area, avoid noise disturbance to food production lines.
Hygiene safety: No spray water, no Legionella risk compared with cooling towers, meets HACCP food‑factory requirements.
Long service life: Stainless‑steel coil resists corrosion from plant‑site corrosive vapor. Easy maintenance: regular compressed‑air blowing for fin dust removal.
Flexible layout: Cooler can be placed on rooftop, outside workshop wall, separate from cold‑room area, save valuable indoor production space.
5. Typical Application Scenarios
Rapid‑chilling room for sterilized pouch gravy, sauces
Pre‑cooling line for packaged mashed potato & pre‑cooked vegetables
Vacuum‑packaged cooked seafood fast‑cooling workshop
Ready‑to‑eat cooked meat batch cooling facility
Retrofit of existing food factory CO₂ refrigeration projects
6. Customizable Options
Coil material upgrade: SUS316L for salt‑corrosion environment
Full‑stainless‑steel cabinet version
VFD fan package
Anti‑freeze electric heating module
Custom cooling capacity & dimension according to cold‑room parameters
