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A satisfactory balance between heat gains and heat losses is fundamental for good winter ventilation of farm animal housing where temperature and humidity control are required. With decreasing outside winter temperature, a point is inevitably reached where animal heat production alone is not sufficient to overcome building heat losses plus ventilation heat losses. For satisfactory humidity control below this critical temperature, there are three alternatives: add supplemental heat, reduce building heat losses, or reduce ventilation heat losses. This problem was reviewed by Turnbull (3). Pattie (1) has shown that if part of the wall or ceiling area of an insulated animal building could be made to act as a porous, distributed fresh-air inlet, some of the building conductive heat loss could be eliminated. Where the ventilating air is drawn through a layer of porous insulation in the opposite direction to the heat flow, this infiltrating air can pick up much of the escaping heat. Thus, the air can be pre-warmed slightly, reducing the effective heat loss to negligible proportions.
ventilation of dairy barns with porous ceiling inlet systems -part i
Turnbull, J.E. and C.G. Hickman 1974. VENTILATION OF DAIRY BARNS WITH POROUS CEILING INLET SYSTEMS -Part I. Canadian Agricultural Engineering 16(2):91-95.
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