Views: 0 Author: Site Editor Publish Time: 2026-10-09 Origin: Site
A greenhouse makes its own humidity — plants transpire continuously, irrigation evaporates, and at night, when the glass cools, that moisture condenses on the roof and drips onto the crop. High humidity is the single biggest driver of fungal disease and of the grower's traditional remedy, venting, which throws heated air out of the greenhouse along with the moisture. A dehumidifier for a greenhouse removes the moisture inside the closed house, keeps the heat, prevents condensation drip and lets the grower hold humidity for crop health and quality instead of fighting it with the vents. CSTHEATEXCHANGER manufactures air-cooled refrigerant dehumidifiers that condense moisture on the evaporator and return the recovered condensation heat to the air — so the greenhouse gets drier and no cooler — with high-static low-noise centrifugal fans for ducting along crop rows, corrosion-resistant coil options for the humid, fertiliser-laden atmosphere, touch-panel control and a communication interface for integration with the greenhouse climate computer. Our Agricultural Heating And Cooling Machine and Rooftop Air Conditioner ranges serve greenhouses that also need heating or cooling.
Source / effect | Detail |
|---|---|
Transpiration | Plants release large quantities of water vapour, highest in the day under light |
Irrigation and wet floors | Continuous evaporation |
Night condensation | Roof glass or plastic cools below dew point; drips on crop; wet leaves at dawn |
Disease | Fungal and bacterial pathogens thrive at high RH and on wet leaves |
Venting cost | Opening vents to dump humidity dumps heat — in cold climates a major share of heating energy |
Closed greenhouses / CO₂ enrichment | Vents must stay shut to keep enriched CO₂; humidity must be removed another way |
Grow rooms / vertical farms | Fully enclosed; all moisture must be removed mechanically |
Humid greenhouse air is drawn through a filter to the evaporator coil, cooled below dew point; water vapour condenses and drains — recoverable as irrigation water where the grower wishes.
The dried air passes the condenser coil and is re-warmed with the recovered condensation heat and compressor heat — the greenhouse loses moisture, not heat.
The centrifugal fan ducts the warm, dry air along crop rows or under benches, giving uniform conditions and air movement across the canopy.
The humidistat holds the set RH; the communication interface lets the greenhouse climate computer control and log the unit.
Materials — coated or stainless coils and trays for the humid, fertiliser- and chemical-laden atmosphere.
Greenhouse | Configuration |
|---|---|
Glasshouse vegetables (tomato, cucumber, pepper) | Ducted refrigerant dehumidifiers along rows; night operation to prevent drip; integration with climate computer |
Ornamentals and cut flowers | Tight RH for quality; multiple units for even conditions |
Propagation / nursery | Stable RH; gentle air movement |
Closed greenhouse with CO₂ enrichment | Dehumidifier is the primary humidity control; sized for full transpiration load |
Grow room / vertical farm | Fully mechanical dehumidification; large capacity; heat recovery offsets lighting heat balance |
Greenhouse needing heating and cooling as well | Agricultural Heating And Cooling Machine or Rooftop Air Conditioner with dehumidification section |
Transpiration load sets capacity — crop type, canopy area, light level, irrigation; size for the peak-growth, closed-vent case.
Night operation — the drip problem is at night; the unit runs when transpiration meets cooling glass.
Air distribution — ducted along rows; avoid blowing directly on plants; uniform canopy conditions.
Heat balance — recovered condensation heat reduces heating; in summer, coordinate with cooling.
Water recovery — condensate is clean; can be collected for irrigation.
Corrosion — coated or stainless wetted parts; washable filters.
Control — integrate with the climate computer via communication interface; RH set points by crop stage.
Venting dumps heat with the moisture; the dehumidifier removes moisture inside and keeps the heat — and lets vents stay shut for CO₂ enrichment.
No — CSTHEATEXCHANGER refrigerant units return the recovered condensation heat; the air is drier and slightly warmer.
Yes — running at night keeps the air below the dew point of the cooling glass.
Yes — via the communication interface for control and logging.
Yes — it is clean water suitable for irrigation collection.
Send CSTHEATEXCHANGER the greenhouse area and crop, light and irrigation regime, target RH by growth stage, heating system and climate computer. We will return a ducted, corrosion-protected dehumidifier selection — or a combined heating/cooling/dehumidifying unit — for approval.
Email: info@cstheatexchanger.com
International business: +86 0519 8878 2189
Website: https://www.cstheatexchanger.com/
CSTHEATEXCHANGER — dry air, kept heat and dry leaves for the greenhouse.
