Infiltration and Ventilation

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Infiltration and Ventilation
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Heat Loss Due to Infiltration

• Infiltration
• Btu H (.018) x (ACH) x V x (Ti To)
• ACH air exchanges per hour
• V volume
• Ti inside temperature
• To outside temperature

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Heat Loss Due to Infiltration

• OR

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Heat Loss Due to Infiltration

• Infiltration
• Using equation 2-11 page 34 and applied to
  Problem 2-1 page 41
• Btu H 1.1 x CFM x (Ti To)
• CFM (ACH x volume) / 60 min per hour

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Heat Loss Due to Infiltration

• Infiltration
• Please Note
• For tight construction use 0.5 for ACH.
• For medium construction use .85 for ACH.
• For loose construction use 1.3 for ACH.
• For really bad construction use 2.0 for ACH
• For the summer months (cooling) use 70 of the
  winter values.

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Heat Gains Due to Infiltration

• Latent Load
• BtuH 4500 x (air exchanges x (volume) /60) x
• (W Final W Initial)
• (W Final W Initial) Difference Ratio Pounds
  of Moisture per dry air

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Heat Loss Due to Ventilation

• Ventilation
• Btu H 1.1 x (Ra x square feet of building )
  
• (number of people in the building x Rp )
• x
• (Ti To)

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Heat Loss Due to Ventilation

• Ventilation
• Ra Area Outdoor Air Rate
• Rp People Outdoor Air Rate
• Example Pharmacy
• Ra .18
• Rp 5

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Heat Loss Due to Ventilation

• Ventilation
• Btu H 1.1 x (.18 x 3,632) (30 x 5) x 76o
• 67,214

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Infiltration and Ventilation

• I hope this clears the problem up!
• Let us move on.