Course Content

  • AHU Fresh Air

Course Content


Q(L)=720 x R x ΔH where: Q(L) is the Latent heat load in kcal/h. R is the fresh air rate in m3/h. ΔH is the absolute difference in outdoor and indoor humidity in kg/kg.

The outside air intake is calculated by multiplying the sum of Vbz in each zone by the calculated Ev value. In our example, if Vbz=600 CFM and Ev=0.6, the outdoor air intake equals 6000.6 = 1000 CFM.

Fresh air is essential for the overall health of HVAC systems and buildings. Ventilation systems, which all have one thing in common: their fresh air is outside air, are the solution for keeping fresh air circulating. It improves the building's air quality by replacing stale or filthy air.

The amount of fresh air required in a building can be calculated using both mass and heat transfer principles. The ventilation rate is defined as the volume of fresh air that reaches an area per unit time (kg/s) or hPa (ft3/min).

As the number of people become more concentrated in certain areas, it is common for buildings to have ventilation systems. One of the biggest benefits of using this type of system is that it can help reduce energy costs as well as improving air quality with proper filtration.

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