DDF Series Hot-Dip Zinc Coolers — WKDL Corrosion-Resistant Evaporators

Standard Evaporators Corroding in Your Seafood or Chemical Cold Room?

In high-humidity, corrosive environments — seafood processing, brine storage, chemical cold rooms, coastal installations — standard painted-steel evaporators start rusting within months. Epoxy coatings peel, fan motors seize, and you face premature replacement costs. The WKDL DDF Series eliminates this problem with full hot-dip galvanized construction that withstands years of salt spray, brine mist, and ammonia-laden atmospheres.

WKDL DDF Series — Hot-Dip Galvanized Evaporators for Corrosive Environments

The DDF Series shares the proven copper tube / aluminium fin coil design of the DD floor-mount line but wraps everything in hot-dip galvanized steel casings, fan guards, drip trays, and mounting frames. Eight models cover 4.0 kW to 38.0 kW cooling capacity across the −18 °C to −35 °C operating range. The zinc coating (≥80 µm per ISO 1461) provides sacrificial corrosion protection that lasts 5–10× longer than paint or powder coat in aggressive atmospheres.

Fan motors are sealed to IP56 with stainless steel hardware. Defrost heaters use nickel-plated elements resistant to chloride attack. Drip trays are sloped and fully galvanized to prevent standing water — a common corrosion accelerator in seafood facilities. Optional stainless steel (SS304/SS316L) drip trays and fan guards are available for the most extreme environments.

The DDF line is the standard specification for seafood processing plants, marine vessel provision stores, salt/brine handling facilities, chemical cold storage, and coastal cold chain infrastructure throughout Southeast Asia, the Middle East, and West Africa.

Key Specifications

CE (Manufacturer’s Declaration)
Manufacturer’s ISO 9001
ISO 1461 Galvanizing

• Operating Temperature — −18 °C to −35 °C
• Cooling Capacity Range — 4.0 kW (DDF-40) to 38.0 kW (DDF-380)
• Casing — Hot-dip galvanized steel (≥80 µm zinc coating per ISO 1461)
• Coil Construction — Copper tubes, hydrophilic aluminium fins, epoxy-coated headers
• Fin Spacing — 6 mm / 9 mm
• Defrost Method — Electric (standard) / Hot-gas (optional on ≥10 kW)
• Fan Motor — IP56 sealed, stainless hardware, 380 V 3-phase
• Drip Tray — Hot-dip galvanized (standard) / SS304 or SS316L (optional)
• Refrigerants — R404A, R507A, R22, R717 (ammonia compatible)

Model Range

DDF (Galvanized) vs DD (Standard) — Which Do You Need?

Rule of thumb: If your cold room handles seafood, brine, salt, chemicals, or is located within 5 km of the coast, specify DDF. The 20–35% price premium pays for itself within 2 years versus replacing corroded standard units. For clean, dry frozen-food warehouses, the DD standard line is sufficient.

Common Applications

• Seafood processing cold rooms — shrimp, fish, squid at −25 °C to −35 °C
• Brine tank areas and salt-handling freezer rooms
• Coastal cold chain infrastructure exposed to salt-laden air
• Marine vessel provision stores and onboard freezers
• Chemical cold storage for corrosive or reactive materials
• Ammonia-refrigerant systems where R717 compatibility is required

Recent Supply Example

A shrimp processing facility in Indonesia ordered 10 × DDF-150 units for blast-holding rooms operating at −30 °C in a high-humidity brine environment. Units included SS304 drip trays and IP56 fan motors. Delivered FOB Shanghai within 25 days at approximately USD 2,600 per unit. Total project value: ~USD 26,000.

Why Source Through hicool?

• Direct factory pricing — typically 30–50% below European equivalents
• Authorized WKDL distributor with full manufacturer warranty
• Complete documentation: galvanizing certificates, salt spray test reports, GA drawings
• Express delivery: 15–20 days for standard models; 25–30 days with SS options
• Spare parts available: IP56 fan motors, galvanized fan guards, defrost heaters

📩 Need a quotation? Send your requirements to sales@hiqool.com or request a quote online. We respond within 24 hours with pricing, lead time, and technical datasheets.