DJ Series Air Coolers — WKDL Low-Temperature Evaporators

Need Blast Freezing Performance That Won’t Buckle at −45 °C?

Standard evaporators ice up fast and lose efficiency below −25 °C, forcing excessive defrost cycles that raise product core temperatures and waste energy. The WKDL DJ Series is purpose-built for ultra-low-temperature environments from −25 °C to −45 °C, featuring oversized coil surfaces, hot-gas defrost as standard, and heavy-gauge construction rated for continuous blast freezing duty.

WKDL DJ Series — Heavy-Duty Evaporators for Blast Freezing

The DJ Series delivers the coil surface area and airflow volume required for rapid product freezing. Nine models span 5.0 kW to 45.0 kW cooling capacity, with coil designs optimised for the high latent loads and extreme frost accumulation of blast freezing operations. Wide fin spacing (9 mm / 12 mm) extends operating time between defrost cycles, while hot-gas defrost clears ice in under 15 minutes without the energy penalty of electric heaters.

Fan assemblies use high-static-pressure axial fans with IP54 motors capable of pushing air through product stacks and tunnel racks. All models feature reinforced mounting brackets rated for the additional ice load weight at ultra-low temperatures, and stainless steel drip trays are standard.

The DJ line serves blast freezing tunnels, quick-freeze rooms in meat and seafood processing plants, pharmaceutical deep-freeze storage, and industrial nitrogen-assisted freezing systems.

Key Specifications

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

• Operating Temperature — −25 °C to −45 °C
• Cooling Capacity Range — 5.0 kW (DJ-50) to 45.0 kW (DJ-450)
• Coil Construction — Copper tubes, hydrophilic aluminium fins, oversized surface area
• Fin Spacing — 9 mm / 12 mm (ultra-low-temp optimised)
• Defrost Method — Hot-gas defrost standard; electric defrost optional on ≤10 kW models
• Fan Type — High-static-pressure axial fans, IP54 motors, 380 V 3-phase
• Casing Material — Heavy-gauge galvanized steel, epoxy powder coat
• Refrigerants — R404A, R507A, R23 (cascade), R744 (CO₂ sub-critical)

Model Range

DJ (Blast Freezing) vs KFS (Blast Chilling) — Which Do You Need?

Rule of thumb: DJ for continuous or batch freezing where products stay in the room for hours. KFS for rapid chilling in food processing where the goal is to pass through the bacterial danger zone (60–5 °C) in under 90 minutes.

Common Applications

• Blast freezing tunnels for meat, poultry, and seafood (−35 °C to −40 °C)
• Quick-freeze rooms for pre-packaged frozen food (−30 °C)
• Pharmaceutical ultra-low-temperature storage (−40 °C)
• Ice cream hardening rooms (−35 °C to −40 °C)
• Industrial plate/contact freezer support cooling

Recent Supply Example

A poultry processing plant in Egypt ordered 6 × DJ-200 units for two blast freezing tunnels operating at −38 °C. Each tunnel processes 20 tonnes of product per 12-hour cycle. Units were delivered FOB Shanghai within 25 days at approximately USD 3,200 per unit, including hot-gas defrost valve assemblies and stainless steel drip trays. Total project value: ~USD 19,200.

Why Source Through hicool?

• Direct factory pricing — typically 30–50% below European equivalents
• Authorized WKDL distributor with full manufacturer warranty
• Complete documentation: performance curves, defrost timing charts, piping diagrams
• Express delivery: 10–15 days for standard models; 20–25 days for custom configurations
• Refrigeration system design support available (compressor + condenser + evaporator matching)

📩 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.