Baolida has launched a drying greenhouse that is 8 meters wide and 12 meters long, with PC boards as the covering material, which is mainly used for drying vegetables.
How to achieve maximum drying efficiency? How long does it take to dry 1 ton of potatoes in this greenhouse?
1. Measures to improve drying efficiency:
- Cut potato slices: Cut the potatoes into slices of uniform thickness (3-5 mm is recommended) to increase the surface area and reduce the time for water evaporation.
- Uniform distribution: Spread the potato slices evenly on the drying rack, avoiding stacking, to ensure that each potato slice can be fully exposed to air and sunlight.
- It is recommended to use multi-layer drying racks to make full use of the internal space of the greenhouse.
- Optimize greenhouse ventilation Use the greenhouse's ventilation system and top vents to keep air flowing and take away evaporated moisture. In high humidity weather, turn on fans to assist ventilation.
- Control greenhouse temperature and humidity: Close some side vents on sunny days, use the light-transmitting properties of PC boards to increase the temperature in the greenhouse and accelerate water evaporation. When the humidity is high at night, the vents can be closed to avoid moisture back-seepage.
- Turn the potato slices at the right time: Turn the potato slices regularly to ensure that the upper and lower surfaces are evenly dried.
2. Estimation of drying time:
Drying time is affected by the following factors:
1. Internal temperature of greenhouse:
The internal temperature of PC board greenhouse is generally 10-15℃ higher than that of outdoor, and can reach about 40-50℃ during the day.
2. Humidity and weather:
Drying efficiency will be higher under low humidity and continuous sunny days.
3. Potato moisture content:
The moisture content of fresh potatoes is about 75%-80%, and the goal is to reduce the moisture content to 12%-15% to achieve a dry state.
Estimated time:
Under optimized conditions (continuous sunny days, good ventilation):
It takes about 3-5 days to dry 1 ton of potato slices in this greenhouse.
If the weather is cloudy or the humidity is high, it may take 6-7 days.
3. Equipment support recommendations:
1. Drying rack: Using a multi-layer hollow drying rack can effectively increase the drying area and improve efficiency.
2. Automated control: The greenhouse intelligent control system can be used to monitor temperature and humidity in real time and adjust ventilation strategies.
3. Auxiliary heating equipment (optional): When there is insufficient light, the auxiliary heating device can be used to shorten the drying time.
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