They are designed to maintain the container’s temperature, humidity, and atmosphere at constant values throughout the transit time. There are 4 settings that must be considered when transporting refrigerated goods: temperature, ventilation, humidity, and drainage.

Temperature: All standard refrigerated containers are built to maintain the temperature of refrigerated and frozen cargo between +25°C and –25°C. A percentage of the world’s refrigerated fleet is also capable of maintaining temperatures at –35°C or below. Special containers (super freezers) keep the temperature at –70°C.

Ventilation: For refrigerated temperatures, air must always flow through the cargo to remove heat and gases. Therefore, the transport box used should be ventilated. Fruits and vegetables need fresh air ventilation. Air must flow around the cargo for refrigerated cargo. There must be no large gaps between the cargo, the wall, and the cargo itself. Goods should be stacked in blocks.

Humidity: Some products benefit from lower air humidity. The cooler has a dehumidification function that reduces the moisture content in the air. While some newer units can go as high as 50%, the standard is relative humidity (RH) between 60% and 85%.

Drains: These are used to drain excess water that may accumulate inside the container. Plus, they’re designed to keep water or insects out of the container.

Internal Fan: An internal fan located inside the cooler helps airflow to promote proper temperature control and stability.

Control Unit: The control unit allows you to set and adjust the internal atmosphere of the cooler, including temperature, alarm conditions, and, in some cases, ventilation and humidity levels.

Fresh Air Vents: The fresh air vents allow air to enter from the outside and allow any gases inside the container (such as ethylene gas from ripening fruit) to escape.

Unit Evaporators: Excessive moisture in coolers can damage products, accelerate food spoilage, and damage packaging, leaving contents vulnerable. The unit evaporator helps keep the moisture in the container. The refrigerated unit’s evaporator heats or cools the air that is circulated by the fan. Sometimes coolers need to heat the air to maintain a consistent internal temperature, which can be done using hot air heating or electric heating elements. Freezers can maintain temperatures up to 30°C (86°F). Whether it heats or cools the air depends on the desired internal temperature.

Condenser: The condenser may be air-cooled or water-cooled, but the industry usually uses air-cooled condensers. The air-cooled type draws cooled air from the top of the container and discharges it under the cargo, pushing the air to the rear door where it then rises by natural convection and flows back over the cargo to the return air vents of the refrigerated unit. As the air flows under the cargo, proper loading and covering as much floor as possible is essential to prevent the ‘chimney’ effect and short cycles.

Features of the 20ft A-frame Container

• Short production cycle: The container has a fast production time and an extended lifespan.
• Easy to move: The container is designed for easy lifting and transportation.
• High structural strength: The container is robust and suitable for installing large electrical equipment.
• Custom design and drawings: Tailored to specific equipment models and purposes, ensuring a more aesthetic, functional, and versatile design.
• Portability: The container is both removable and reusable.
• Efficient assembly: Quick manufacturing with no need for a foundation.
• Safety: Constructed with a steel frame, the container is resistant to wind and shock.
• Long-lasting: The steel plate exterior is corrosion-proof, acid-proof, rust-resistant, and crack-resistant, providing over 20 years of durability.
• Sound and heat insulation: Air insulation design offers excellent soundproofing and thermal insulation.
• Attractive appearance: Available in various shapes with colorful exteriors, providing a bright and appealing look.
• Affordable: High-quality container at a competitive price.

CONSTRUCTION SPECIFICATION

The floor is composed of sub-floor, VIP panel, PLS rail, cross member, fiberglass tube, fiberglass assembly and Top “T”-shaped floor board with insulation of polyurethane. There are two PLS rails welded between rear door sill and front sill .There are four holes in the left side PLS rail and four holes in the right  side PLS rail. There are four Forklift holes in the left side PLS rail and four holes in the right side PLS rail. There is a locking panel in the left side PLS rail and a locking panel in the right side PLS rail. Some Forklift protect plates will be welded between two PLS rails Forklift holes and bottom side rails. Some cross members will be welded between PLS rail and bottom side rail. Between the sub floor and Top “T”-shaped floor board some VIP panels are placed. The Top “T”-shaped floor board is to be screwed to each fiberglass tube by countersunk full threaded stainless steel screws. As the Top “T”-shaped floor board is inserted each other by its groove and convex side.  The Top “T”-shaped floor board are welded together to form a one- piece and offers the best protection against water and air leakage.  There are six (6) ANCRA track fixed between the Top “T”-shaped floor boards by 10.9 grade high strength M10 bolts.Two (2) drain holes with rubber plugs are provided at the rear end of the container. The drain pipe is made of poly-vinyl chloride of low thermal conductivity. At the end of the pipe, there are automatic drain valves.

The roof is composed of several MGSS panels butt welded together by automatic TIG welding with corrugations facing upwards onto which hat section Corten roof bows are welded to outer skin by spot welding. At the perimeter, the roof sheet is welded to the outside flange of the top side rail. Two (2) PVC extruded spacers are inserted to roof bows. A Front Evaporator is fitted to roof lining by stainless steel bolts. Between the roof plate and roof lining some VIP panels are placed.

The right side door is for a special design. The side door is composed of MGSS door panel, and small corrugated stainless steel inner lining with polyurethane insulation. The door has hinges, locking gears and a door rope. The outer E.P.D.M.”C” section double lip and Inner E.P.D.M.”O” section with mould corners are provided. The door has four hinges. There is an 864X377 escape window on side door. A  VIP panel is place in

Front frame is composed of Corten steel frame members and “A” shape frame. Front end wall is composed of Corten steel frame members, and a recessed front panel .The front panel is composed of 1.2 mm thick M.G.S.S. panel and stainless steel inner lining with polyurethane insulation. The refrigeration machinery can be fitted on the front panel by stainless steel bolt. The “Z” section front posts which are fitted to the outer skin by structural adhesive. The fuel tank will be fitted up the front PLS rail by owner. Between the front wall plate and front wall lining some VIP panels are placed. 

Rear end wall is composed of Corten steel frame and door. The hinge lugs are composed of MGSS .The rear door is composed of MGSS door panel, and corrugated stainless steel inner lining with polyurethane insulation. Each door has hinges; locking gears and a door rope which holds it open approximately 270°. The outer E.P.D.M.”C” section double lip and Inner E.P.D.M.”O” section with mould corners is provided. There is an 864X377 escape window on right rear door. Not any TIR bolt is used.

The refrigerated unit has two evaporators, one fixed on the front roof lining in frozen room, another fixed on the left side lining in cooler room. The outer refrigerated unit fixed on the outer.