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44 TRG-TRC001-EN
notes
period six
Psychrometric Analyses
In response to the reduction in room sensible heat gain, the coil capacity is
throttled, raising the supply air temperature from D to D’ to balance the new
room sensible heat gain. This new supply air temperature is dictated by the
equation:
Since the supply airflow and the desired room dry-bulb temperature are
constant, the only variable that responsed to this change in sensible heat gain is
supply air temperature.
This new supply air temperature D’ is delivered in sufficient quantity to absorb
the room’s sensible heat gain, but it does not fall on the part-load SHR line and
is not dry enough to completely absorb the latent heat gain. When the
conditioned air enters the room, it mixes with room air along the 0.70 sensible
heat ratio line from D’ to A’. The resulting room condition A’, where the SHR
line intersects the room dry-bulb temperature line (78°F), shows that the
relative humidity increased to 61%.
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Figure 71
Supply Airflow (cfm)
Sensible Heat Gain
1.085 Room DB Supply DB–()×
=
47,000 Btu/hr
1.085 78°F Supply DB–()×
3,430 cfm=
Supply DB 65.4°F=