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Greenhouse Heating Systems

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Types of heating systems (List 3 and leave space) Terms: BTU (Define) ... 4. Types of Heating Systems. Things to keep in mind: ... – PowerPoint PPT presentation

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Title: Greenhouse Heating Systems


1
Greenhouse Heating Systems
  • Harrison County High School
  • Agriculture Department
  • Mrs. Jones

2
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

3
1. Operation Costs
  • Labor
  • Heat
  • Water
  • Fertilizer Supplies

4
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.

5
3. Fuels used for heating a greenhouse
  • Gas
  • Fuel Oil
  • Coal
  • Electricity
  • Wood
  • Solar Energy

6
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

7
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

8
1. Boilers
  • 2 Types
  • Steam systems
  • Hot water systems
  • Provides more constant heat

9
Pipes
10
Cold Pockets
11
Hot Water or Steam Distribution
12
(No Transcript)
13
(No Transcript)
14
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

15
Convection Tube
16
Holes
17
(No Transcript)
18
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

19
4. Terms
  • BTU (British Thermal Unit)
  • Heat required to raise 1 lb. of water 1oF
  • Used to measure and compare ability of heating
    systems

20
REVIEW
21
Unit Heaters
  • ARE ALSO KNOWN AS???
  • LOCALIZED
  • Used for _____________greenhouses
  • smaller
  • Convection heat- means to heat the______
  • air

22
Unit Heaters
  • Distribute heat by _____ or convention tubes
  • fans
  • Most burn_________ _________
  • natural gas

23
Radiant Heaters
  • Also Known As??-
  • Infrared Heater
  • Infrared Heat Lamp creates heat
  • Radiant Heat
  • IR warms ______________??
  • surfaces (plants, benches, sidewalks, soil)

24
Radiant Heaters
  • Heaters are ______________ 20 to 30 feet apart
  • overhead
  • Fueled on ______ or ____________
  • Gas / Electricity

25
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

26
Boilers
  • A.K.A????-
  • Centralized
  • Usually used to heat ___________ greenhouses
  • larger (15,000 sq ft or more)
  • Burns ______ fuels (coal, oil, natural gas)
  • fossil

27
Boilers
  • Pipes are used to distribute heat
  • 2 Types ????
  • Steam systems
  • Hot water systems
  • Provides more constant heat

28
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

29
What type of heater is this?
  • Unit heater- with convection tube
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