Ventilation Lesson 1: Principles of Air Flow & Moisture Control

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Presentation transcript:

Ventilation Lesson 1: Principles of Air Flow & Moisture Control Ag Structures – Mr. Dieckhoff

Air Flow in a Dairy Barn https://www.youtube.com/watch?v=Iaq-s9ZmrN0

Ventilation in Poultry Barn https://www.youtube.com/watch?v=xyn2RwpS4Vs

Ventilation in Horse Stalls https://www.youtube.com/watch?v=O4oPQdhMUII

Ventilation in a Shop https://www.youtube.com/watch?v=f2U4pdqN4d8

Heat Transfer Heat always moves from warm areas toward cold areas .

How to Combat Heat Transfer Insulation is typically placed in the walls, floors, and ceilings that surround the working areas of an enclosed structure.

Heat Transfer Methods

How Heat is measured A Btu is the quantity of heat required to raise the temperature of 1 lb of pure water 1°F at or near the temperature of maximum density of water (39°F).

Dew Point Moisture is always present in the air, although it is usually not visible to the naked eye. The dew point is the temperature at which condensation occurs. Condensation must be prevented in all structures because it can lead to hidden problems such as mold, insect damage, and weakening of wooden strength members.

R-Value the capacity of an insulating material to resist heat flow. The higher the R-value, the greater the insulating power

Preventing Heat Transfer Air infiltration to a building is prevented by installing caulking, weather stripping, or door bottom seals.

Preventing Heat Transfer Multiple-pane windows can have two or more panes of glass and are used to reduce heat loss within a structure.

Preventing Heat Transfer Gas-filled windows are three to four times more energy efficient than standard multiple-pane windows.

Preventing Heat Transfer

Review Heat Transfer Conduction, Convection, Radiation BTU Dew Point R-Value

True/False Quiz (14 points – 2 pts ea) The three methods by which heat transfer occurs are conduction, convection, and radiation. Convection is the direct transmission of heat by invisible waves similar to light waves. Insulation materials protect a building from losing heat or coolness by any method of heat transfer. Heat is measured in British thermal units (Btu). Moisture is always present in the air, although it is usually not visible to the naked eye. Condensation must be prevented in all structures because it can lead to hidden problems such as mold, insect damage, and weakening of wooden strength members. Glass-filled windows are three to four times more energy efficient than standard multiple-pane windows.