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Is tunnel ventilation negative pressure ventilation?
- Yes:
- cools animals with wind chill
- Better for warmer climates (not used N. of Lethbridge)
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How does tunnel ventilation work?
- negative intake on both sides at one end
- cold water is used to cool air at intake
- sucks air through the barn and out the other end--> large fans
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A downfall of tunnel ventilation
- only used in warmer climates
- expensive (thermometer controlled sometimes)
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What is negative pressure ventilation?
- negative pressure inside
- air is actively pumped out
- Passive intake--> control over speed of fans, more control over air intake (**12m**)
- active exhaust
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How can you tell if negative pressure ventilation is working?
- ideally air should tumble and pick up moisture
- used smoke bomb and watch how the smoke moves
- feel for wind and temperature
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What happens if air intake is too large or small is negative pressure ventilation?
- too large: air drops in and pool on floor. Moves too slowly and is too cold
- too small: air whistles through too fast and doesn't mix or pick up moisture
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Positive pressure ventilation
- positive pressure on inside of barn
- control over : speed of fan intaking air
- Air is actively pumped in
- **least common b/c less control
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Ventilation (3)
- 1. optimize gases (increase O2, decrease CO2, ammonia, methane, water, SO2)
- 2. modulate temperature
- 3. decrease dust, mold & bacteria
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ice damming (what is it?)
snow melts on roof (warm air) then freezes when it hits cold air at overhang
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in let (what is it?)
allows air to passively come in barn
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curtain (in relation to in let)
tarp that can be lowered or raised to control passive air intake
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Claiming pens
enclosure for ewes to give birth and/or bond with new baby lambs
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Sheep dip tank
tub of chemicals and disinfectants that saturates and kills flees and ogns on sheep
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