Food-grade Aluminum Pre-cooling And Refreezing Evaporator Units

Overview

The FD series pre-cooling and refreezing evaporator is a precision-engineered refrigeration solution tailored for food processing, seafood, and pharmaceutical applications. As a food-grade aluminum evaporator, it prioritizes hygiene, efficiency, and rapid cooling—making it ideal for pre-cooling fresh produce, refreezing processed goods, and preserving delicate items like berries. This low-pressure-drop evaporator features variable-fin-spacing coils and a vibration-proof design, delivering cost-effective performance without compromising on reliability. Backed by STELX’s expertise in industrial refrigeration, the FD series stands out as a versatile quick freezing evaporator that minimizes goods weight loss and shortens processing time.

Details

Structural & Material Design

Constructed with food-safe materials, the FD evaporator uses aluminum tubes/fins and optional stain steel 304/316 housing, complying with strict hygiene standards for food and pharmaceutical use. Its 3.0mm aluminum end plates enhance structural integrity while keeping production costs competitive. The electrostatic epoxy coating resists chemical sanitation, ensuring long service life even in frequent cleaning environments. For installation flexibility, it offers pre-fitted stainless steel return gas flanges, copper/aluminum liquid lines, and capillary tube protectors to simplify deployment and shipping safety.

Thermal Performance & Defrosting

The series’ signature variable-fin-spacing freezer coil (24-12-6mm to 40-20-10mm) minimizes pressure drop by 30%, allowing cold air to fully envelop products for uniform cooling. Its advanced defrosting system uses full-width perforated spray bars with evenly distributed nozzles, achieving zero-defrost dead zones without disrupting airflow. Whether using electric, hot gas, glycol, brine, or water defrosting, the FD evaporator ensures consistent performance while reducing downtime. Reinforced fan mounting plates with backside stiffeners eliminate operational vibration, enabling 24/7 vibration-free use.

Operational Advantages

With a capacity range of 10 ~ 150 kW, the FD evaporator adapts to small-to-medium processing lines and large-scale facilities alike. Its low-turbulence airflow reduces compressor workload, cutting energy consumption while maintaining high cooling capacity. The vertical air direction and compact design support both ceiling and floor mounting, making it suitable for tight spaces. Real customer feedback highlights its short refreezing time and exceptional results, particularly in seafood and berry applications.

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Water defrosting

Hot gas defrosting

Mounting feet

Corrosion protection

Distributions protection

Core Features

Food-Grade Construction: Aluminum tubes/fins and stainless steel housing (AISI 304) ensure hygiene compliance.

Low-Pressure-Drop Airflow: Triple-stage variable fin spacing reduces resistance by 30%.

Zero-Defrost Dead Zones: Full-width spray bars deliver uniform defrosting.

Vibration-Proof Design: Reinforced fan panels and armored end plates eliminate operational shake.

Quick Installation: Pre-fitted flanges and transport guards cut commissioning time by 50%.

Energy-Optimized: Low-turbulence airflow lowers compressor workload and energy costs.

Versatile Mounting: Ceiling or floor installation options for space flexibility.

Short Refreezing Time: Accelerates processing without compromising product quality.

Corrosion Resistance: Electrostatic epoxy coating withstands chemical cleaning.

Multi-Refrigerant Support: Compatible with HFC, NH₃, and CO₂ for diverse applications.

Usage

Application Scenarios

Food Processing Plants: Pre-cooling fresh produce, refreezing meat/poultry, and preserving baked goods.

Seafood Facilities: Rapid freezing of fish, shrimp, and shellfish to maintain freshness.

Berry & Fruit Processing: Gentle cooling to minimize dehydration and weight loss.

Pharmaceutical Labs: Temperature-sensitive material storage and pre-cooling.

Small-to-Medium Cold Storage: E-commerce micro-fulfillment centers and local distributors.

Ideal For

Food processors, seafood suppliers, and pharmaceutical businesses that require precise pre-cooling or refreezing. It excels in environments where hygiene, speed, and energy efficiency are non-negotiable—from artisanal producers to large-scale manufacturing facilities.

What is the capacity range of the FD series evaporator?

It offers a flexible capacity range of 10 ~ 150 kW, suitable for small processing lines to medium-scale industrial operations.

Is it easy to clean and maintain?

Yes! The optimized design facilitates easy inspection and cleaning, while the corrosion-resistant coating and zero-maintenance drainage system (capillary guards) reduce upkeep needs.

Can it be customized for specific fin spacing?

Absolutely—fin distances are available in 24-12-6, 28-14-7, 32-16-8, 40-20-10mm, or can be tailored to your requirements.

What fan motors does it use?

The FD series is equipped with reliable axial fans, ensuring efficient airflow and low noise operation.

Why choose a food-grade aluminum evaporator over stainless steel?

Food-grade aluminum offers excellent thermal conductivity for faster cooling, while remaining lightweight and cost-effective. Stainless steel options (AISI 304/316) are also available for high-hygiene or corrosive environments.