Kivinen, Tapani

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1Positive pressure tube ventilationFor calf barnsTapani KivinenMTTAgrifood Research FinlandAnimal Production ResearchDairy barn built in 2011, Separated compartment with separatedindividual ventilation for calves2Dairy barn built in 2011, Separated compartment with separatedindividual ventilation for calvesToday we recommend dairy producers to buildseparate buildings for milking cows, calves and heifersReason: disease prevention3A calf barn - outsideA calf barn - inside4Manure removal+ new strawMilk taxiHay + silagePositive pressure tube for blowing air into the barnCalf barn 280 m248 animal places5,6 m2/calf (total area)Simple and functional calf barn (expandable)Positive pressure means slight over pressure,However it has no negative impact on constructions becauseair escapes freely through curtains, chimneys, doors etc.Precision air blow flushesStanding unclean air awayFrom the boxes5Tube system is aplicable in old barns, too.Tube system is aplicable in old barns, too.6A new calf barn in Middle FinlandWhere measurements were doneAir tubesGroup pensSinglepens7Planning tool = excel based programmDesigned by Dr. Ken Nordlund et al. – University of Wisconsin USA8First measurement, curtains openNorth facadeSecond measurement, curtains closedNorth facade9Air speed inside,Curtains openAir speed inside,Curtains openWinddirectionAir speed outside outletsCurtains closedAir speed outside outletsCurtains closedAir speed at pen levelCurtains closedSecond measurement, curtains closedOutdoor temp + 24 CPositive pressure tube ventilation performanceSpatial volume is 1020 m3 (15 x 20 x 3,4 m)Blown air quantity is 1900 m3 per hourThis is equivalent to 1,9  (2) changes per hourNo harmful draught on animal levelThis can be considered as sufficient basic ventilation rate!When the target is to flush the boxes at animal level!(in winter, curtains closed)(in summer, no wind)10Typical outdoor and indoor temperatures (hour by hour) in natural ventilated curtain barn for 120 dairy cows in Finland(measurements and simulation 2011 by VTT & MTT)-30-20-100102030401.1. 31.1. 1.3. 31.3. 30.4. 30.5. 29.6. 29.7. 28.8. 27.9. 27.10. 26.11. 26.12.Sisälämpötila, CUlkolämpötila, COutdoor tempindoor tempAir exchange rate and outdoor  temperature in naturally ventilated dairy barn with curtainsIlmanvaihtokerroin (1/h) vuoden jokaisena tuntina ulkolämpötilan suhteen02468101214161820-35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25ulkolämpötila, C0ilmanvaihtokerroin 2 exchages / hourIs sufficient enough specially in winter conditionsAir exchagerate, times/ hourOutdoor temperature, CAir exchange rate during every hour around the year, (8760 hours)Performance areaFor a mechanicalFan ventilation(measurements and simulation 2011 by VTT & MTT)11Fresh air!

Positive pressure tube ventilation for calf barns

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