Views: 0 Author: Site Editor Publish Time: 2026-05-15 Origin: Site
1. Core Design Requirements for Banana Ripening
Banana rooms need stable temperature, uniform airflow, high humidity, and no direct cold wind on fruit.
Temp range: 13°C – 20°C (adjustable for different ripening stages)
Humidity: 85% – 95%RH
Airflow: horizontal circulation, no dead zones
Defrost: minimal, low-frequency
Material: food-safe, corrosion-resistant (ethylene + high humidity = corrosive)
2. Complete Air Cooler Unit Design
A. Type
Ceiling-mounted ducted / non-ducted air cooler
Horizontal blowing, top return air
B. Heat Exchanger (Coil)
Tube material: copper tube + aluminum fin
Fin spacing: 4.0mm – 5.0mm (wider to prevent clogging & frost buildup)
Rows: 4 – 6 rows (balanced cooling capacity and airflow)
Design pressure:
For normal refrigerant: ≥3.0MPa
For CO₂ refrigerant: ≥12.0MPa (high-pressure design)
C. Fan Design (Most Critical for Banana Rooms)
EC external rotor motors (energy-saving, adjustable speed)
Reversible fan function optional (improves uniformity in large rooms)
Air volume: high air volume, low wind speed
→ Avoid drying banana peel / causing uneven temperature
Air outlet: long strip air deflector to spread airflow evenly
D. Casing & Structure
Casing: galvanized sheet + plastic spray / 304 stainless steel
Drain pan: stainless steel, inclined design, no water accumulation
Suspension type: 4-point hanger with shock absorption pads
E. Defrost System
Electric heating defrost (most common for banana rooms)
Defrost starts by time + coil temperature
Drain pipe with heat tracing cable to prevent freezing
F. Drainage
Large diameter drain hole
U-shaped water trap to prevent air backflow
Insulated drain pipe
3. Airflow Layout Design (Key to Even Ripening)
Small room (≤2 rooms)
One air cooler mounted centrally on the ceiling
Air blows horizontally to the far wall, circulates back
Medium/large banana room
2 air coolers, one on each side
Airflow forms horizontal double circulation
Keep 0.8m – 1.2m distance from banana boxes
Do NOT blow directly at cartons
Goal:
Whole room temperature difference ≤ ±0.5°C
No hot spots, no cold spots
4. Matching Refrigeration System Design
Unit cooling capacity: 100W – 150W per m³ of room volume
Use small temperature difference design
→ Coil temperature not too low
→ Reduce humidity loss
For better humidity retention:
→ Reduce fan speed during cooling
→ Avoid excessive dehumidification
5. Control System Design
Independent electric control box
Digital temperature controller (0.1°C precision)
Fan: continuous running (low speed)
Defrost: automatic, 1–2 times per day (or as needed)
Protection:
Fan overload
High pressure
Defrost overheating
Power phase loss protection
6. Standard Technical Parameters (Example)
Cooling capacity: 15kW – 60kW
Fan quantity: 2 – 6 pcs
Fin space: 4.5mm
Defrost: electric heating
Power supply: 380V/3Ph/50Hz
Protection class: IP54
Installation: ceiling suspension
If you tell us your room size (length × width × height) and number of banana boxes, I can give you a custom air cooler model & exact layout drawing description.
