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Poultry AnSc 440 > Ventilation > Flashcards

Ventilation Flashcards

1
Q

why do you need ventilation

A
  • gas exchange with O2 and get rid of CO2
  • heat and humidity control
  • moisture control
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2
Q

what are the primary factors that determine how much ventilation we need

A
  • temperature / humidity
  • moisture (ammonia, dust, pathogens)
  • gases (oxygen, CO2 and Carbon monoxide)
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3
Q

what kind of pressure does ventilation create? how?

A

negative pressure
- pressure inside is higher then air outside
- air inside brings air from outside

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4
Q

what helps with negative pressure

A
  • fans move air, pushing it out
  • air intakes (inlets) direct air - air distribution and movement in a barn
  • control mechanisms = minimum ventilation control (never have no air moving)
  • thermostates, relative humidity
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5
Q

what do fans do

A
  • air exchange pushes air out
  • provides negative pressure in barn that powers air entry and assists in air distribution
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6
Q

what is the relationship between air inlets and fans

A

one pushes air and one directs it

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7
Q

what is the difference between intentional and unintentional air flow

A

intentional - fans and inlets
unintentional - air that you dont want, a gap in the wall or an open door or window

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8
Q

what happens when the static pressure gauge is below 0.05

A
  • too much opening
  • air enters very slowly
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9
Q

what happens when static pressure is above 0.12

A
  • too little opening
  • not bringing in enough air
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10
Q

what is the relationship between static pressure and air velocity

A

they work in tandem
- the higher the static pressure the higher the air velocity

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11
Q

why is fan location not very important

A

they just drop air outside to maintain the pressure
- so it doesnt matter where the air gets dumped

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12
Q

what factors affect fan capacity

A

-restrictions - fan covers
-amount of negative pressure - fans rated against a negative pressure
- air short circuting - movement back against the fan

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13
Q

why is there minimum ventilation

A
  • fan capacity that maintains an acceptable barn environment
  • always need at least a little air flowing
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14
Q

what is important to remember in the summer

A

fan capacity for cooling
- minimizes the temperature increase in the barn

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15
Q

what is important when selecting the fans

A
  • quantity of air delivered at different static pressures
  • energy efficiency
  • quality of dealer service and support
  • reliabiliy
  • suitability for application
  • cost - purchasing and operating
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16
Q

what path does air take when it enters a proper inlet

A

drags up along the roof to warm up the air before it drops down onto the birds

17
Q

what is the function of inlets

A
  • no motor or electronics
  • space in wall that opens and closes for temp reg
  • facilitate removal of moisture
18
Q

does location of an inlet matter

A

yes

19
Q

how are inlets controlled

A
  • static pressure gauges
  • computers or manuals - detecting if barn is too hot or cold and opens or closes depending on temp
20
Q

what happens if air is cold

A
  • chills the birds
  • cold air also doesnt remove moisture from the litter
  • more heat to remove moisture and warm birds
  • they dont grow well because all their energy is used to stay warm
21
Q

what does the air getting conditioned mean

A

warmed
- the air needs to be heated before it drops down on the birds
- also helps with moisture

22
Q

where should inlets be

A

as close to the ceiling as possible
- ideally the top of the inlet is the ceiling
- angeled not surface mounted
- should be able to direct air downword during hot weather

23
Q

what happens if theres a free air jet

A
  • no chance for air to warm
  • chilling birds
  • not removing moisture
  • causes crowding
24
Q

how can you test for air leaks

A

smoke bombs

25
Q

should ceilings be free of obstructions

A

yes
obstructions change the airflow

26
Q

what happens if the barn is loose

A
  • ## static pressure will decrease (reduced inlet air speeds and air mixing)
27
Q

how can you make up for poor inlet design

A
  • circulation fans
  • move warm down
  • typically in older barns
28
Q

what are other control mechanisms

A
  • cold weather ventilation
  • fan use - variable speeds, timer based
  • RH and ammonia monitors
  • thermostats - staged settings bring on more fans with higher temperatures

Poultry AnSc 440 (19 decks)

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