Greenhouse And Cannabis Cultivation Cooling Systems

Greenhouse And Cannabis Cultivation Cooling Systems

Cannabis, especially high-value medicinal cannabis grown indoors, has extremely demanding environmental requirements:

Mold Control During Flowering: During the flowering period, humidity must be strictly controlled between 40-50%. A separate dehumidification system is absolutely essential, as cooling and dehumidification alone may not be able to meet these requirements and consumes extremely high amounts of energy. Once humidity levels are out of control, gray mold outbreaks are highly likely, leading to complete plant destruction.

Odor Control: Some AHUs can also integrate activated carbon filters to treat the strong odor emitted by cannabis plants, meeting environmental or privacy requirements.

Light Cycle Synchronization: The system must be 100% light-tight to prevent light from leaking into the grow room during the dark cycle, disrupting the plant's photoperiod and causing abnormal flowering or reduced yields.

Air handling units used in greenhouses and cannabis cultivation are the core of environmental control. They differ significantly from AHUs in typical commercial buildings and are designed specifically to meet the unique needs of plant growth.

Powerful Temperature and Humidity Control Capabilities

Cooling: These units are typically connected to large chillers, screw compressors, or direct expansion coils to handle the significant heat loads generated by plant transpiration and solar radiation. Heating: Built-in hot water or steam coils are used for winter or nighttime heat preservation.

Dehumidification: This is one of the most critical functions. In addition to condensation dehumidification via the cooling coil, a rotary dehumidifier or heat pump dehumidification system is often integrated to provide independent and efficient dehumidification even when cooling is not required (especially at night).

Humidification: A high-pressure mist humidifier or steam humidifier is used to quickly add humidity when humidity is insufficient.

High-Precision CO₂ Concentration Management: The cabinet is typically equipped with a CO₂ injection line and a gas distributor to evenly distribute CO₂ into the supply airflow.

By integrating with environmental sensors, the CO₂ concentration in the greenhouse is maintained at 800-1500 ppm (much higher than the atmospheric level of 400 ppm) during daytime when photosynthesis is active, significantly improving yields.

High-Efficiency Air Filtration: Bag/panel filters rated EU4/F8 or higher are used to prevent pollen, dust, fungal spores, and other airborne pathogens from entering the growing area, which is crucial for preventing pests and diseases.

Highly Sealed

The enclosure and coils are tightly sealed to prevent the leakage of expensive CO₂ gas, ensuring efficient resource utilization.

Durability and Corrosion Resistance

Due to the long-term high humidity and potential use of chemical agents in greenhouse environments, internal frames and panels are typically constructed of galvanized steel or stainless steel with an anti-corrosion coating.