Which is the term used to describe any type of greenhouse cooling system that does not utilize energy to cool the structure?

1.   ?    open
2.   ?    closed
3.   ?    passive
4.   ?    active
5.   ?    none of the above

Which is the term used to describe any type of greenhouse cooling system that utilizes energy to cool the structure?

1.   ?    open
2.   ?    closed
3.   ?    passive
4.   ?    active
5.   ?    none of the above

What is the most common type of active cooling system used for greenhouses?

1.   ?    swamp coolers
2.   ?    positive pressure coolers
3.   ?    fan-and-pad cooling systems
4.   ?    self-condensing air conditioners
5.   ?    none of the above

What is the basis by which both fan-and-pad cooling systems and positive pressure cooling systems cool air before it enters the greenhouse?

1.   ?    wind speed
2.   ?    changes in pressure
3.   ?    evaporation
4.   ?    shading
5.   ?    none of the above

When using a fan-and-pad cooling system, fans create a vacuum that results in air movement. Where is the vacuum created?

1.   ?    inside of the greenhouse
2.   ?    outside of the greenhouse
3.   ?    inside of the unit containing the fan
4.   ?    outside of the unit containing the fan
5.   ?    none of the above

When using a positive pressure cooling system, a fan creates a vacuum that results in air movement. Where is the vacuum created?

1.   ?    inside of the greenhouse
2.   ?    outside of the greenhouse
3.   ?    inside of the unit containing the fan
4.   ?    outside of the unit containing the fan
5.   ?    none of the above

What is the basis by which saran or dilute white latex paint reduces greenhouse temperatures?

1.   ?    wind speed
2.   ?    changes in pressure
3.   ?    evaporation
4.   ?    reduces incoming solar radiation
5.   ?    none of the above

What is the purpose of the sump in a fan-and-pad cooling system?

1.   ?    it pumps water over the pads
2.   ?    it creates a vacuum inside of the greenhouse
3.   ?    it chills the water before it passes over the pads
4.   ?    it serves as a reservoir of water for the pads
5.   ?    none of the above

Which factors may reduce the effectiveness of a fan-and-pad cooling system?

1.   ?    high relative humidity
2.   ?    salts buildup on the pads
3.   ?    algae growth on the pads
4.   ?    all of the above
5.   ?    none of the above
   
   

What is a disadvantage of using sodium hypochlorite (bleach) to prevent algae growth on the pads of a fan-and-pad cooling system?

1.   ?    sodium increases pH and softens the pad
2.   ?    sodium decreases pH and softens the pad
3.   ?    sodium hypochlorite does not kill algae
4.   ?    very large amounts of sodium hypochlorite are required
5.   ?    none of the above

What is the name of a greenhouse cooling system that uses very small water droplets suspended briefly in the air to cool the surrounding air?

1.   ?    positive pressure cooler
2.   ?    swamp cooler
3.   ?    fog cooling system
4.   ?    fan-and-pad cooling system
5.   ?    none of the above

What type of fan is commonly used in a positive pressure cooling system?

1.   ?    squirrel cage fan
2.   ?    flat bladed fan
3.   ?    inversed fan
4.   ?    reversed fan
5.   ?    none of the above

When placing fans along a greenhouse wall for a fan-and-pad cooling system, what is the maximum distance that should occur between fans?

1.   ?    10 ft
2.   ?    25 ft
3.   ?    55 ft
4.   ?    60 ft
5.   ?    80 ft

Integration of multiple cooling systems allows staging of the cooling systems with increasing cooling capacity being brought online as the cooling need increases. What is the primary advantage using this strategy in greenhouse cooling?

1.   ?    allows a lower temperature to be maintained
2.   ?    reduces energy costs
3.   ?    reduces relative humidity in the greenhouse
4.   ?    none of the above
5.   ?    all of the above

What are the two most common thicknesses for cellulose pads to be used in a fan-and-pad cooling system?

1.   ?    1 and 2 inches
2.   ?    2 and 4 inches
3.   ?    4 and 6 inches
4.   ?    10 and 12 inches
5.   ?    none of the above

What is the recommended length for the pad wall used in a fan-and-pad greenhouse cooling system?

1.   ?    50% of the length of the wall to one side (running perpendicular) of the fans
2.   ?    the length of the wall to one side (running perpendicular) of the fans
3.   ?    50% of the length of the wall opposite of the fans
4.   ?    the entire length of the wall opposite of the fans
5.   ?    none of the above