Greenhouse Management

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Presentation transcript:

Greenhouse Management Greenhouse Heating

Greenhouse Heating After the cost of labor, greenhouse heating is the greatest expense a grower will have. Heating costs: Fuel Greenhouse location Crops grown

An Outline of Heating Systems Central Heating Steam Hot water Biotherm Heating Unit Heater Infrared (Radiant) Heater

Central Heating Boiler heats water or makes steam. Hot water systems operate at temperatures of around 180 degrees F. Steam systems operate at temperatures between 212 - 215 degrees F.

Central Heating Coil

Central Heating-Coil Location The pipes (coil) that distribute the hot water or steam are mounted: on the curtain wall above the crop below the benches in the floor

Coil Location: Curtain Wall

Coil Location: Above the Crop

Coil Location: Below the Benches

Coil Location: In the Floor Delta Tube HD Floor Heating

Floor Heating Plastic tubes are buried in the floor. Can be used in gravel or concrete floors. Good for bedding plants which are typically grown in flats on the floor.

Advantages of Below Crop Heating Improved heat transfer to the crop. Better root development and plant growth. Increased foliage temperatures and reduced condensation problems. Energy savings.

Finned Pipe vs. Bare Pipe Finned pipe increases the surface area for heat dissipation. The external surface area of 100 linear feet of Delta Fin Multi Fin pipe is approximately the same as 844 linear feet of 2” bare pipe. DeltaFin TF Delta Fin Multi Fin

Hot Water Biotherm Heating Uses flexible plastic tubing through which hot water is circulated. The tubes are installed 2-3 inches apart across the width of the bench. Pots or flats are placed directly on top of the tubes.

Hot Water Biotherm Heating DeltaTube Heating System

Hot Water Biotherm Heating Supply Manifold Return Manifold

Unit Heaters Typically fueled by natural gas. Some models contain a coil that circulates hot water or steam. Unlike boilers, unit heaters are located inside the greenhouses they heat. Air flow can either be horizontal or vertical depending upon the model selected.

Gas-fired Horizontal Unit Heater

Horizontal vs. Vertical Unit Heaters Horizontal Unit Heater Vertical Unit Heater

Infrared (Radiant) Heaters Installed directly above the crop. Consists of a metal tube in which natural gas is burned. Tube is heated to 900 degrees F. A metal reflector directs the heat downwards.

Infrared (Radiant) Heaters CoRayVac Infrared Heater

Infrared (Radiant) Heaters Advantages: very efficient (90%) reduced fuel costs since the heater heats the plants, soil, and benches, foliage condensation is reduced.

Infrared (Radiant) Heaters Disadvantages: cold spots; plants must be directly under the heater. heater blocks incoming sunlight. cold soil; as the crop grows larger it prevents the radiation from reaching the soil. Root rot is more problematic in cold soils.

The End