Insulating the poultry house

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Insulating the poultry house

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The act of protecting something by surrounding it with some material that reduces or prevents the transmission of heat. 3

Needs of insulationTo maintain uniform temperature

To conserve heat

To eliminate heat stress

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Benefits of insulationIt saves money and limited energy resources

Makes our house more comfortable by helping to maintain a constant temperature throughout the house

It helps to improve bird performance in both winter and summer

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During colder periods, insulation is beneficial for reducing the loss of heat from the building. So, it makes walls, ceilings, and floors warmer in the winter

During hot weather, insulation reduces the amount of heat allowed to enter the building. So, it makes walls, ceilings, and floors cooler in the summer6

Cont.

Insulation in RoofInsulation in the ceiling or under the roof is essential in all climate.

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Insulation in WallsIn colder climates, insulation in the side walls and end walls is also recommended.

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Insulation is economical..

Increased level of insulation becomes more economical as the difference between outside temperature and the desired inside temperature. 9

Qualities of insulating materialsThe quality of an good insulator material is that it must resist the transfer of heat.

A insulator material must contain a large number of small isolated dead air spaces.

The more small air spaces present in a cubic unit of a material, the better insulator it becomes.

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R-valueThe ability to resist the transfer of heat through a material is called resistance

It is referred to as R-value.

Higher the R-value, the greater its ability to restrict the transfer of heat.

R = T / QA11

Vapor BarrierDefinition:

Vapor barriers is a sheet on a insulating material which resist the movement of water vapors or moisture

Benefits of vapor barrier:

It keeps the insulating materials dry

If moisture comes it act as a conductor, resulting in the transfer of heat.

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ContCertain insulating materials do not absorb moisture and thus do not require a vapor barrier. Polystyrenes, Polyurethans, Vermiculite

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ContThese insulating materials will absorb moisture and therefore require a separate vapor barrier. CelluloseFiberglassVarious wool products

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Permeability (perm) valueThe ability of a material to allow or restrict vapor movement is known as its permeability (perm) value.

A perm value of less than 0.5 is required for a material to be considered a desirable vapor barrier. 15

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17More than 0.5Not acceptable vapor barriers. - Plywood - Framing limber - Bricks - Concrete - Masonry blocks

Importance of vapor barriersThe vapor barrier must be installed on the inside (warm side) of the insulation to minimize the movement of water vapor into the material. 18

How Much Insulation is required????

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R-Value in different climateThe following are recommended R-value for three types of climates:

20Climate type R-valueCeilingSide wallsHot (t < 30F or 17C)*96Medium (t 30 - 50F or 17 - 28C)*128Cold (t > 50F or 28C)*2014

*t = difference between inside and lowest outside temperatures

Determining the R-value of walls and roofsAll building materials have an R-value

The sum total of the R-values of the various materials used will give the total R-value for a wall or roof section.

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R-Value of wallR value of a wall section has been calculated below:

22Wall insulation itemR-valueOutside surface0.17Metal siding0.09vertical air space0.913 -inch fiberglass (3.7 per 1 inch)12.95Vapor barrier 0.15-inch plywood0.32Inside surface0.61Total resistance rating (R) of wall15.20

Determining heat loss from buildings Heat loss from the side walls and ceiling can be calculated by using the following equation:

Q = A t R

Q = Total heat loss in btus (per hour)A = The area of outside wall and ceiling surfaces (ft)t = Difference between inside and outside temperature (F)R = R-values

23A British Thermal Unit (BTU) is the amount of heat energy needed to raise the temperature of one pound of water by one degree F.

Heat loss during winter:Heat loss can occur when ventilating with fans during winter while removing moisture from the poultry house.

In properly constructed and insulated poultry houses, up to 75% of total heat loss can occur in this way. 24

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Calculation of heat loss through ventilationThe following equation is used to calculate heat loss through ventilation:Q = 0.018 CFM 60 t

Q = Total heat loss in btus (per hour)0.018 = A constantCFM = Measurement of air flow in cubic feet per minute60 = Converting cubic feet per minute to cubic feet per hourt = Difference between inside and outside temperature

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R- Values of Building MaterialsItems R-values

1.Blanket bat3.70 2.Wool fiber blanket4.00 3.Cellulose fiber4.16 4.Polysterene molded3.50 5.Polysterene extruded5.00 6.Urethane foam6.60 7.Straw4.75 8.Wood fiber3.33

Summary Insulation help to maintain uniform temperature and eliminate heat stress

More the dead isolated air spaces, material become good insulator

Greater the R-Value, greater the ability to resist the heat

Vapor barrier keeps the insulating material dry

Determine the R-value R = T / QA

Determine the heat loss from the building Q = A t RCalculation of heat loss through ventilation Q =0.018CFM60t

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