1. Product Overview

This series of air coolers (also known as ceiling-mounted evaporators) are forced convection heat exchange units specifically designed for cold storage interiors. They absorb heat from within the storage facility via high-efficiency internal coils, utilising axial fans to uniformly distribute cool air throughout every corner of the chamber for rapid temperature reduction.
Featuring a compact design for ceiling installation, these units maximise floor storage space. We offer three standardised series – Fresh-keeping, Freezing, and Quick-freezing – tailored to different storage temperatures, perfectly compatible with all types of Freon refrigeration units.

2. Series & Classification

Within the cold storage industry, air coolers are typically categorised into three main series based on fin spacing to accommodate varying frosting conditions:
2.1 DL Series (High-temperature type)
Fin Spacing: 4.5 mm
Operating Temperature: Around 0°C (primarily for temperatures above -5°C)
Typical Applications: Vegetable and fruit preservation cold stores, egg storage, floral storage, pharmaceutical cool storage.
Features: Dense fins provide extensive heat exchange surface area, effectively maintaining humidity within the storage area and reducing moisture loss in produce.
2.2 DD Series (Medium-Temperature Type) - Most Commonly Used
Fin Spacing: 6.0 mm
Operating Temperature: Approximately -18°C (primarily for -15°C to -25°C)
Typical Applications: Meat refrigeration, seafood freezing, ice cream storage.
Characteristics: Moderate fin spacing design ensures heat transfer efficiency while preventing excessive frost buildup and blockage during freezing operations.
2.3 DJ Series (Low-Temperature Type)
Fin spacing: 9.0 mm
Operating temperature: Below -25°C (primarily for -35°C blast-freezing chambers)
Typical Applications: Food rapid-freezing tunnels, fresh meat rapid-freezing chambers.

Features: Extra-wide fin spacing design prevents airflow blockage from heavy frost accumulation during rapid freezing, ensuring prolonged operation without frequent defrosting.