What is the structure of the hot air circulation chili drying room

The hot air circulation chili drying room is mainly composed of the following core components:

1. Hot air generation system: It includes burners (fuel oil/gas/electric heating) or heat pumps, providing a stable heat source. Take electric heating as an example. Its power is usually 15-30kW, which can meet the low-temperature drying requirements of 40-60℃.

2. Circulating fan: A high-temperature resistant axial flow fan (air volume 2000-5000m³/h) is adopted to force air flow and ensure uniform heat distribution.

3. Drying room: Multi-layer stainless steel or galvanized sheet material tray racks, with a layer spacing of 15-20cm, can hold 500-2000kg of fresh peppers at a time.

4. Dehumidification device: An adjustable dehumidification port is installed at the top. It automatically opens when the humidity exceeds 70% to maintain the drying efficiency.

Optimization of the hot air circulation path

Adopt the "top in and bottom out" or "side in and side out" airflow pattern to avoid dead corners. A reasonable layout can reduce energy consumption by more than 20%.

Install deflector plates in the air duct to control the wind speed at 1.5-2.5m/s and prevent local overheating.

2. Thermal insulation and sealing performance

The wall is made of polyurethane sandwich panels (with a thickness of 100-150mm), and the thermal conductivity is ≤0.025W/(m·K), reducing heat loss.

Silicone sealing strips should be embedded in the door gap, and the air leakage rate should be less than 5%.

3. Intelligent control system

The integrated temperature and humidity sensor (with an accuracy of ±0.5℃) and PLC controller enable the setting of multi-stage drying curves. For example: 50℃ for the initial stage (2 hours) → 45℃ for the middle stage (6 hours) → 40℃ for the later stage (2 hours), to prevent the color of the chili peppers from deteriorating.

1. Adaptive improvement: For high-humidity areas, auxiliary dehumidifiers (dehumidification capacity ≥10L/h) can be added; During the rainy season, the feeding interval should be shortened to 2 to 3 hours.

2. Maintenance points: Clean the dust accumulated on the fan blades every month and check the resistance value of the heating element every quarter (replacement is required if the deviation exceeds 10%).