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Air Conditioning Unit for Oyster Mushroom Rooms
Oyster mushrooms require strict environmental parameters during different growth stages (spawning, mycelium colonization, and fruiting). The air conditioning unit must regulate:
Temperature: Typically 20–25°C (68–77°F) for mycelium growth and 15–20°C (59–68°F) for fruiting. Fluctuations can slow growth or cause abnormal fruiting.
Humidity: High humidity (85–95%) is essential to prevent mushroom caps from drying out, especially during fruiting.
Air Circulation: Gentle airflow to distribute heat, moisture, and fresh air evenly, avoiding stagnant zones that may lead to mold or bacterial contamination.
CO₂ Control: Mushrooms release CO₂ during respiration; proper ventilation (via the AC unit) removes excess CO₂ (keeping levels below 1000 ppm) and introduces fresh oxygen.
Key Features of Air Conditioning Units
Precise Temperature Regulation
Equipped with high-sensitivity thermostats and variable-speed compressors to maintain temperatures within ±1°C of the setpoint. This stability is critical, as even small deviations can disrupt mycelium growth.
Some units include heating elements to raise temperatures in cold environments (e.g., winter) or in rooms with excessive heat loss.
Humidity Control
Integrated humidifiers ( ultrasonic, evaporative, or steam-based) to boost humidity levels. Evaporative humidifiers are common, as they add moisture without significantly cooling the air.
Dehumidification capabilities for periods of excess moisture (e.g., after watering substrates), using refrigeration-based dehumidifiers or desiccants to prevent condensation and mold.
Air Circulation & Ventilation
Low-noise fans (axial or centrifugal) with adjustable speed to ensure gentle, uniform airflow. Turbulent air can damage delicate mushroom caps, while stagnant air increases contamination risk.
Ventilation systems to exchange stale air with fresh outdoor air (filtered to remove contaminants like spores or dust). This helps expel CO₂ and replenish oxygen.
Filtration
High-efficiency particulate air (HEPA) or activated carbon filters to remove airborne contaminants (mold spores, bacteria, dust) that could compete with oyster mushrooms or cause disease.
Energy Efficiency
Inverter technology adjusts compressor speed based on cooling/heating demands, reducing energy consumption.
Insulated ducts and panels minimize heat exchange between the mushroom room and external environments, lowering operational costs.
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