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PAES > GREENHOUSE > Flashcards

GREENHOUSE Flashcards

1
Q

(FLOOR AREA REQ) Benches should be up to _____ wide if they are to be access from both sides, and should not exceed ______ if they are accessible only from one side.

A

1.8 m , 0.9 m

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2
Q

(FLOOR AREA REQ) An air circulation space of approximately _______ shall be allowed between the sidewalls and the benches.

A

160 mm

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3
Q

(FLOOR AREA REQ) For fixed benches, the usable space should be _________ of the floor area while ________ for rolling benches.

A

66%-75% , 90%

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4
Q

(WALKWAYS) If the walkway will be used only as a place to stand while servicing the benches, a minimum of ________ aisle shall be used for determinate crops and a minimum of _______ aisle for indeterminate crops.

A

0.3 m , 0.8 m

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5
Q

(WALKWAYS) The width of the walks shall be adjusted if machinery will be used. Larger greenhouse often have __________ secondary aisle and __________ primary aisle.

A

0.6 m - 0.9 m , 1.2 m -1.8 m

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6
Q

(WALKWAYS) If a worker is in a wheelchair, __________ wide aisle shall be used and ramps shall be provided for easy access.

A

1.2 m

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7
Q

(FLOOR LENGTH AND WIDTH) When figuring the length of a plastic structure, an extra _________ shall be allowed to fasten the plastic properly.

A

0.6 m

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8
Q

(FLOOR LENGTH AND WIDTH) The length of the greenhouse should not exceed __________.

A

50 m

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9
Q

(FLOOR LENGTH AND WIDTH) For gutter connected greenhouses, the total width should not exceed __________ for well distribution of air.

A

50 m

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10
Q

(BUILDING HEIGHT) The eave height for a gable roof greenhouse shall be atleast _________ with a minimum gable height of _________.

A

1.7 m , 2.4 m

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11
Q

(WORKING HEIGHT) Gutter heights of __________ are recommended for multi span houses to allow machines to move freely.

A

2.8 m - 3.0 m

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12
Q

(WORKING HEIGHT) The height of the house in the walk areas shall not be less than ________.

A

2.0 m

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13
Q

(WORKING HEIGHT) For tall crops, _________ shall be the minimum height at the eaves and __________ as minimum desirable height.

A

2 m , 2.1 m

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14
Q

(FOUNDATION) For permanent greenhouses, all foundations shall be of durable material and shall extend to a minimum depth of _________.

A

0.45 m

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15
Q

(WALLS) Height of side posts and columns should be _________.

A

0.3 m - 3 m

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16
Q

(WALLS) For greenhouses with wooden structural members, a _________ high reinforced concrete wall at the bottom shall be provided for support.

A

0.4 m

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17
Q

(FRAMES) Framing shall adequately support the covering and any equipment and/or hanging baskets suspended from the framing. It shall be able to carry trellising loads up to ___________.

A

25 kg/m²

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18
Q

(FRAMES) Framing shall be able to withstand maximum wind gusts of __________.

A

250 km/hr

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19
Q

(FRAMING MATERIALS - WOOD) Rafters should be placed __________ from center to center, depending on the strength requirements.

A

0.6 m - 1.2 m

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20
Q

(FRAMING MATERIALS - WOOD) Greenhouses over ________ wide shall require a reinforced truss construction.

A

15.25 m

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21
Q

(FRAMING MATERIALS - WOOD) Purlins should be connected by a cross tie. __________ spacing should be used depending on the size of the greenhouse.

A

1 m - 2.5 m

22
Q

(COVERING) It should be durable as well as economical and should withstand heavy loads like wind gusts of ____________.

A

150 kph

23
Q

(COVERING MATERIALS) Polyethylene sheet roofing shall have a minimum thickness of __________.

A

130 úm

24
Q

(ROOF PITCH) Roof pitch for a glass greenhouse should be _________ to prevent inside condensation from dripping on plants.

A

51%

25
Q

(ROOF PITCH) Plastic covered greenhouses require a steeper pitch of ____________ to prevent drip.

A

58% - 70%

26
Q

(GUTTER) For gutter connected greenhouses a __________ slope shall be provided for drainage.

A

2%

27
Q

(ACCESS) Large doors in the end of the greenhouse should be provided. If walking tractors are to be used, ________ wide standard doors shall be provided. A minimum of _________ wide side doors shall be provided.

A

1.2 m , 0.8 m

28
Q

(FLOOR AND WALKWAYS) A concrete, gravel or stone walkway __________ wide should be built for easy access to the plants.

A

0.6 m - 0.9 m

29
Q

(BENCHES) Benches should be of height and width suitable to an averaged size worker, benches shall not exceed ________ high when against the wall.

A

0.9 m

30
Q

(BENCHES) For temporary benches for growing and bedding plants, benches as wide as __________ and only ____________ high should be used.

A

1.5 m - 1.8 m , 0.45 m - 0.6 m

31
Q

(BENCHES) When shade plants are to grow under the benches, bench heights as high as ________ should be used.

A

1.2 m

32
Q

(ARTIFICIAL LIGHTING) Artificial lighting should be provided for the production of photo-period sensitive plants and for the workers, _________ lux should be provided.

A

200

33
Q

(IRRIGATION AND DRAINAGE) A general rule of thumb to follow in irrigating greenhouse crops is to apply _________ more water than the container will hold to facilitate leaching at each irrigation and reduce the potential for the accumulation of soluble salts.

A

10% - 15%

34
Q

(IRRIGATION AND DRAINAGE) The recommended drainage rate is ___________ of the water dose given to the plant. The drained water should be contained in a storage tank.

A

30% - 50%

35
Q

(IRRIGATION AND DRAINAGE) Soil beds and benches are leveled with a slight slope of __________ to drain the water dripping from the media containers.

A

0.8% - 1%

36
Q

(NATURAL VENTILATING SYSTEM) Large vent openings provide the most ventilation, the total vent area should be ___________ of the floor area.

A

15% - 25%

37
Q

(NATURAL VENTILATING SYSTEM) Top hinged ridge vents should form a _______ angle with roof when fully opened.

A

60⁰

38
Q

(MECHANICAL VENTILATING SYSTEM) A maximum ventilation rate of __________ air exchange per minute is recommended for most greenhouses.

A

3/4 - 1

39
Q

(MECHANICAL VENTILATING SYSTEM) Ventilation fans should deliver the required ventilation capacity at _________ static pressure when all guards and louvers are in place unless specific design requirements require air delivery at higher static pressures.

A

0.03 kPa

40
Q

(MECHANICAL VENTILATING SYSTEM) Fans should be spaced not more than ________ apart for uniform ventilation.

A

7.5 m

41
Q

(MECHANICAL VENTILATING SYSTEM) If the fans must be located on the windward side, increase the design ventilation capacity at least _________.

A

10%

42
Q

(MECHANICAL VENTILATING SYSTEM) A clearance between the fan discharge and any obstruction of at least ________ the fan diameter should be maintained. Fans may be mounted in the roof if obstructions interfere with other mountings.

A

1.5 times

43
Q

(MECHANICAL VENTILATING SYSTEM) Intake louver area should be at least ______ times the area of the fans.

A

1.25

44
Q

(MECHANICAL VENTILATING SYSTEM) Manufactured guards should be used or install a woven wire mesh screen of at least ______ (gage 16) wire and_______ openings, for placement within 100 mm of moving parts.

A

1.5 mm , 13 mm

45
Q

(MECHANICAL VENTILATING SYSTEM) Guards more than 100 mm
from moving parts may be made with woven wire mesh of _______ (gage 12) wire, and _______ openings.

A

2.7 mm , 50 mm

46
Q

(PAD AND FAN COOLING) The pad to fan distance should be _______.

A

30 m - 50 m

47
Q

(PAD AND FAN COOLING) The pad is normally run continuously along the side or end of the house opposite the ventilation fans. Vertical pad height should not exceed _______ nor less than be ______ for uniform water flow.

A

2.5 m , 0.5 m

48
Q

(PAD AND FAN COOLING) Pad location is not as important when the greenhouse is sheltered from prevailing winds by another building or greenhouse located within ________.

A

7.5 m

49
Q

(PAD AND FAN COOLING) Keep fans from exhausting directly into pads on an adjacent greenhouse, unless they are separated by at least ________.

A

15 m

50
Q

(SHADING) Overhangs should be sized to fit the particular design requirements of the space. The length of the overhang should be _________ of the glazing height, and the height of separation between window and overhang should be ________ of the window height.

A

1/3 -1/2 , 1/4

51
Q

(INSTRUMENTATION AND CONTROLS) The shade should be made of a material having a low thermal conductivity and high reflectivity such as white painted wood. Wood should have a minimum thickness of _______.

A

13 mm

PAES (3 decks)

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