A presentation on Greenhouse Structures. Structures with walls and roofs covered with transparent material. Allows sunlight to enter for plant growth and maintenance. Artificially heated and cooled
2. GREENHOUSE
Structures with wall and roof
Covered with transparent material
Allows sunlight to enter for plant
growth and maintenance
Artificially heated and cooled
3. Purposes
Control interior environment
Over wintering tender plants
Raising vegetables, fruits and
flowers out of season
Growing specialty plants
Special Experiment
4. Designed to local weather
extremes
Minimum yearly temp.
Max. wind speeds
Max. snow loads
Best light transmission
8. The greenhouse is put
against the wall of
building and thus
makes use of maximum
sun light and minimum
roof support structure.
Usually, this style is not
for commercial
purpose. The heat loss
in this type is very low,
usually on the south-
facing side.
Attached Greenhouse
9. Attached Greenhouses
Advantages:
Less construction material needed
Can be utilized to heat homes in
winter, cool in summer through heat
and humidity change
Disadvantages
Existing building can shade the
greenhouse, limiting light needed for
plants
Ventilation and temperature are
difficult to control.
10. Greenhouse is not
attached a buildings.
Usually, this greenhouses
are
constructed for commercial
purposes
Freestanding Greenhouse
12. Even-Span
Rafters of equal
length
Usually clears
spans w/ truss
supports
ADVANTAGE:
Allows more
freedom of space/
movement and
equipment
13. Uneven-Span
Rafters of unequal length
Usually used for hillside placement
ADVANTAGES: maximizes sun light
DISAVANTAGES: internal orientation of
greenhouse can make working in it
difficult
24. Shed
Designs allow the roof to be opened
and closed.
Gives plants protection from
weather when needed
Reduced watering, rainwater can be
used
25. Lath House/ Shade House
Provides some shade and wind
protection for plants
Allows moisture and air to permeate
structure
Used as an outdoor setting for
plants with some protection
26. Greenhouse Coverings
Glass
Provides excellent light
transmission.
Long-lasting.
Double-strength
installation and heating.
Requires good structural
support of aluminum or
steel.
27. Greenhouse Coverings
Polycarbonate
Lightweight
Ease of installation.
Good heat insulation.
Good light transmission.
Available in clear,
corrugated single layer
panels.
Good replacement for
corrugated fiberglass-
reinforced plastic.
Disadvantage:
Flammable
28. Greenhouse Coverings
Corrugated
Fiberglass-Reinforced
Plastic
Low in cost.
Ease of installation.
Tensile strength.
Longer lifespan.
Good light penetration.
Can degrade over time
from ultraviolet damage,
dust, and pollutants.
Flammable and may
increase insurance costs.
29. Greenhouse Coverings
Polyethylene
Inexpensive installation.
Low heating cost.
Short-lived.
UV inhibitors increase its
lifespan.
Produces condensation
which increases wet
plant foliage and disease
possibilities.
Light reduction
compared to glass.
31. Hot water heat system
heating water in a boiler and pumping the hot water
Steam heat
boilers that bring water to a boil and the resulting steam
flows through pipes in the greenhouse
Unit heaters
heat air within the unit, then blow the air throughout the
greenhouse.
Infrared heat systems
produce heat energy that is absorbed by the plants, media,
and benches
Heating
36. Natural
Air exchange is fostered through
open ridge and side venting, under
thermostatic control.
Not advised for winter cooling due
to possible plant injury
37. Fan-Tube
Fans bring in cool air which is mixed
with warm air and distributed
though holes in plastic tubing
running the length of the
greenhouse
May be used in conjunction with
heating systems