Greenhouse Heating Systems

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Greenhouse Heating Systems

• Harrison County High School
• Agriculture Department
• Mrs. Jones

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Things to Consider

• Operation Costs (List 4)
• The greenhouse effect (explain)
• Fuels used for heating a greenhouse (List 6)
• Types of heating systems (List 3 and leave space)
• Terms BTU (Define)
• Reference Commercial Greenhouse pg. 71- 85

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1. Operation Costs

• Labor
• Heat
• Water
• Fertilizer Supplies

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2. The greenhouse effect

• Light strikes the cladding and undergoes
  diffraction.
• The light bounces off the floor and other
  structures and is trapped by the cladding.
• This results in a positive flow of energy.

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3. Fuels used for heating a greenhouse

• Gas
• Fuel Oil
• Coal
• Electricity
• Wood
• Solar Energy

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4. Types of Heating Systems

• Things to keep in mind
• Optimum temperature ranges from 60-80 degrees,
  depending on the plant stages
• Night temperature often from 50-65 degrees

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1. Boilers

• A.K.A- Centralized
• Usually used to heat larger greenhouses (15,000
  sq ft or more)
• Burns fossil fuels to create steam or heat water
  (coal, oil, natural gas)
• Pipes are used to distribute heat

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1. Boilers

• 2 Types
• Steam systems
• Hot water systems
• Provides more constant heat

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Pipes
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Cold Pockets
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Hot Water or Steam Distribution
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2. Unit Heaters

• A.K.A. LOCALIZED
• Used for smaller greenhouses
• Convection heat- to heat the air
• Distribute heat by fans or convention tubes
• Most burn natural gas
• Can operate independently

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Convection Tube
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Holes
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3. Radiant Heaters

• AKA- Infrared Heater
• Infrared Heat Lamp creates heat
• Radiant Heat
• IR warms surfaces (plants, benches, sidewalks,
  soil)
• The warm surfaces in turn warms the air
• The air is not directly heated
• Heaters are overhead 20 to 30 feet apart
• Fueled on gas or electricity

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4. Terms

• BTU (British Thermal Unit)
• Heat required to raise 1 lb. of water 1oF
• Used to measure and compare ability of heating
  systems

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REVIEW
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Unit Heaters

• ARE ALSO KNOWN AS???
• LOCALIZED
• Used for _____________greenhouses
• smaller
• Convection heat- means to heat the______
• air

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Unit Heaters

• Distribute heat by _____ or convention tubes
• fans
• Most burn_________ _________
• natural gas

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Radiant Heaters

• Also Known As??-
• Infrared Heater
• Infrared Heat Lamp creates heat
• Radiant Heat
• IR warms ______________??
• surfaces (plants, benches, sidewalks, soil)

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Radiant Heaters

• Heaters are ______________ 20 to 30 feet apart
• overhead
• Fueled on ______ or ____________
• Gas / Electricity

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Heating Systems

• Things to keep in mind
• Optimum temperature ranges from____ to ____
  degrees, depending on the plant stages
• 60-80
• Night temperature often from____ to ____degrees
• 50-65

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Boilers

• A.K.A????-
• Centralized
• Usually used to heat ___________ greenhouses
• larger (15,000 sq ft or more)
• Burns ______ fuels (coal, oil, natural gas)
• fossil

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Boilers

• Pipes are used to distribute heat
• 2 Types ????
• Steam systems
• Hot water systems
• Provides more constant heat

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Terms

• BTU stands for ?
• (British Thermal Unit)
• Heat required to raise ___ lb. of water __oF
• 1, 1
• Used to ________ and compare ability of heating
  systems
• measure

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What type of heater is this?

• Unit heater- with convection tube