Question

For an infiltration
rate of 1.32 air changes per hour (ACH), determine sensible,
latent, and total infiltration heat load of a building at sea
level, in kW, that is 20 m long, 13 m wide, and 3 m high when the
outdoor air is at 32°C and 35 percent relative humidity. The
building is maintained at 24°C and 55 percent relative humidity at
all times. The gas constant and the specific heat of air are
*R* = 0.287 kPa·m^{3}/kg·K and
*c _{p}* = 1.005 kJ/kg·°C, respectively. Use data
from the tables.

The sensible infiltration heat load of the room is kW.

The latent infiltration heat load of the room is kW.

The total infiltration heat load of the room is kW.

Answer #1

Given: building temperature

relative humidity

ambient temperature

relative humidity

From the psychrometric chart we determine the humidity ratios

We will calculate the volume

From ideal gas equation we will determine the density of outside air

mass flow rate of air entering the room given ACH = 1.32

enthalpy at room temperature Tr ==>

sensible

latent

Total heat transfer

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