Which is a term that describes heat loss through the glazing, metal purlins, barcaps and doors of a greenhouse?

1.   ?    radiation
2.   ?    conduction
3.   ?    infiltration
4.   ?    excitation
5.   ?    none of the above

Which is a term that describes heat loss through cracks or openings around glass panels, doors and fans of a greenhouse?

1.   ?    radiation
2.   ?    conduction
3.   ?    infiltration
4.   ?    excitation
5.   ?    none of the above

Which is a term that describes a heating system that generates heat in one location and distributes that heat energy to many locations or throughout a large greenhouse complex?

1.   ?    central heating system
2.   ?    localized heating system
3.   ?    radiant heating system
4.   ?    unit heating system
5.   ?    none of the above

Which is a term that describes a heating system in which the heat is generated within the greenhouse structure that it is intended to heat?

1.   ?    central heating system
2.   ?    localized heating system
3.   ?    solar heating system
4.   ?    passive heating system
5.   ?    none of the above

Which is an advantage of using steam rather than hot water to distribute heat throughout a greenhouse complex?

1.   ?    less water is required when using steam
2.   ?    pumps are not required for distribution when using steam
3.   ?    less plumbing is required with steam
4.   ?    steam allows for more rapid temperature adjustments
5.   ?    all of the above

At what temperature is steam that is generated in a boiler and used to heat greenhouses?

1.   ?    100(Degree)F
2.   ?    115(Degree)F
3.   ?    150(Degree)F
4.   ?    215(Degree)F
5.   ?    350(Degree)F

Which is the term for the amount of heat energy required to raise 1 lb of water 1(Degree)F?

1.   ?    mho
2.   ?    ohm
3.   ?    S
4.   ?    joule
5.   ?    Btu

Which is a fuel source that could be used in a central heating system for a greenhouse complex?

1.   ?    wood chips
2.   ?    coal
3.   ?    natural gas
4.   ?    number 1 oil
5.   ?    all of the above

Which is the part of a unit heater that collects hot exhaust, allows the transfer of heat energy from the exhaust to the air inside the greenhouse and allows the exhaust to be vented to outside of the greenhouse?

1.   ?    fan
2.   ?    flame box
3.   ?    heat exchanger
4.   ?    fuel line
5.   ?    none of the above

As the diameter of the pipe used to distribute hot water throughout a greenhouse (in a central heating system) increases, how does the number of Btu delivered (or released) per linear foot of pipe change?

1.   ?    the number of Btu given off per linear foot increases
2.   ?    the number of Btu given off per linear foot decreases
3.   ?    there will be no change
4.   ?    this answer depends on the type of pipe used
5.   ?    none of the above

Out of which material may pipes used to distribute steam in a central heating system be made?

1.   ?    cast iron
2.   ?    aluminum
3.   ?    copper
4.   ?    all of the above
5.   ?    none of the above

Which is an advantage of "finned" pipe as compared to "smooth" pipe when used in a greenhouse heating system?

1.   ?    more Btu are given off per liner foot of finned pipe
2.   ?    fewer Btu are given off per linear foot of finned pipe
3.   ?    one would never use finned pipe because the cost is too high
4.   ?    finned pipe has a longer life span
5.   ?    none of the above

What is the primary purpose of HAF fans when used in greenhouses?

1.   ?    mix air within a greenhouse to improve temperature uniformity
2.   ?    create an environment unfavorable to insect pests
3.   ?    improve heat generation of unit heaters
4.   ?    improve uniformity of water distribution from overhead irrigation systems
5.   ?    none of the above

Which is a common name for a heating system that uses rubber tubes to circulate hot water in close proximity to the plant roots and increase the temperature of the root substrate?

1.   ?    biologe
2.   ?    radiant
3.   ?    convection
4.   ?    Netafilm
5.   ?    Biotherm

Which is a fuel source that cannot be used in unit heaters in greenhouses?

1.   ?    natural gas
2.   ?    propane
3.   ?    No. 2 fuel oil
4.   ?    waste motor and cooking oils
5.   ?    wood chips

What would be a typical heat transfer coefficient (Btu/ft(Square)/hr/(Degree)F) for a single layer of glass used as a greenhouse glazing?

1.   ?    1.13
2.   ?    2.20
3.   ?    4.50
4.   ?    5.60
5.   ?    7.25

What would be a typical heat transfer coefficient (Btu/ft(Square)/hr/(Degree)F) for a double layer of glass used as a greenhouse glazing?

1.   ?    0.35
2.   ?    0.65
3.   ?    1.25
4.   ?    2.25
5.   ?    3.25

What would be a typical heat transfer coefficient (Btu/ft(Square)/hr/(Degree)F) for a single layer of polyethylene film used as a greenhouse glazing?

1.   ?    0.15
2.   ?    1.15
3.   ?    2.15
4.   ?    3.50
5.   ?    4.50

What would be a typical heat transfer coefficient (Btu/ft(Square)/hr/(Degree)F) for a double layer of polyethylene film used as a greenhouse glazing?

1.   ?    0.70
2.   ?    1.40
3.   ?    2.40
4.   ?    3.40
5.   ?    4.40

With respect to greenhouse construction and maintenance, which would be an important method of heat conservation?

1.   ?    select a glazing with a low heat transfer coefficient
2.   ?    design the greenhouse to minimize surface area
3.   ?    plant windbreaks around the greenhouse to reduce wind speeds
4.   ?    seal all cracks or openings in the greenhouse structure
5.   ?    all of the above