Greenhouse Energy Balance
Greenhouses heat large volumes of air and vent warm, humid air during the day, so recovering that exhaust energy to pre-heat incoming air directly reduces the heating bill and stabilizes the growing environment.
How Recovery Helps
An air-to-air core transfers heat from the vented air to the intake, and an enthalpy version also moves moisture back in, which can reduce the humidification or the condensation load. Because growing is continuous, the saving accrues every day through the season.
| Need | Core choice |
|---|---|
| Heat only | Plate |
| Heat and humidity | Enthalpy or membrane |
Specifying
Size for the ventilation rate the crop needs, keeping pressure drop within the fan budget. Condensation on the exhaust side is expected and should drain, and corrosion-resistant materials suit the damp, fertilizer-laden air.
Outcome
Growers report meaningful cuts in heating energy and more stable temperatures, which protects growth and yield. The recovered-energy figure supports the carbon and energy reporting that increasingly accompanies produce sold into regulated or premium markets.
Sizing and Selection Checklist
| Need | Core |
|---|---|
| Heat only | Plate |
| Heat and humidity | Enthalpy or membrane |
| Corrosion | Resistant to fertilizer air |
| Drainage | Condensate managed |
Common Pitfalls
Growers sometimes size only for heating and ignore humidity recovery, missing the larger summer saving. Others use non-corrosion-resistant material in damp, fertilizer-laden air. Forgetting condensate drainage wets the space instead of recovering energy.
Frequently Asked Questions
Does recovery help in summer?
Yes, returning moisture to intake can cut humidification or condensation load, depending on the climate and crop.
What saving is typical?
Meaningful heating-energy cuts and more stable temperatures, which protect growth and yield through the season.
Summary
Greenhouse recovery stabilizes the growing environment and reduces heating energy with a documented carbon figure.
Next Steps for Greenhouses
Start by recording the daily ventilation schedule and the humidity ratio of the exhaust, because that decides whether a sensible or enthalpy core is the better buy.
- Map ventilation on and off periods across the season to size the core.
- Decide if moisture recovery matters for your crop and climate.
- Specify corrosion-resistant material for the damp, fertilizer-laden air.
A correctly sized core stabilizes the growing environment while lowering the heating bill and the reported carbon figure.
Cost, Payback and Upkeep
Greenhouse recovery is a moderate capital item whose payback is steadier temperatures and lower heating energy through the season. The main extra cost is corrosion-resistant material and managed condensate in damp, fertilizer-laden air.
- Capital: core plus drainage and resistant material.
- Payback: meaningful heating cut and yield protection across the season.
- Upkeep: condensate management and periodic core cleaning.
The recovered-energy figure also supports the carbon reporting increasingly tied to produce sales.
Key Takeaways
Greenhouse recovery stabilizes the growing environment: record the ventilation schedule and humidity ratio to choose sensible or enthalpy recovery, specify corrosion-resistant material for damp air, and manage condensate drainage.
- Size from the seasonal ventilation schedule.
- Decide latent need by humidity ratio.
- Resistant material and drainage.
By reducing both the heating bill and temperature swings, recovery protects crop yield and quality, which often outweighs the equipment cost many times over. The documented carbon figure also helps growers meet the reporting now tied to premium and regulated produce markets.