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Latent System Capacity
The total capacity of an air conditioner is made up of the
Sensible capacity, the output of the unit used to remove
heat from the air in the area being conditioned, and the
Latent capacity, the output of the unit used to dehumidify
the air in the area being conditioned. For humid climates
and applications, the Sensible/Latent capacity split of the
unit should be considered. The Sensible capacity listed in
the specification charts on page 55 is at a standard rating
condition of 95°F dry bulb/75°F wet bulb outdoors; 80°F dry
bulb/67°F wet bulb indoors. The Latent system capacity is
1.00 minus the Sensible capacity. (If the Sensible capacity is
listed at .74 the Latent capacity is .26. This means that 74% of
the capacity of the unit is used to remove heat from the air
and 26% is used to remove moisture form the air at standard
test conditions.)
In some applications information about the Sensible/Latent
split, or ratio, at conditions other than the standard rating
conditions is needed. The chart below provides data at
various indoor conditions.
MODEL
Indoor WB
(F)
Indoor Ambient DB Temperature (F)
60 65 70 75 80 85 90 95 100
All 7000 BTUH 59 0.51 0.67 0.83 0.99 1.00 1.00 1.00 1.00 1.00
units except 63 0.46 0.62 0.77 0.92 1.00 1.00 1.00 1.00
Dry Air 25 67 0.42 0.60 0.75 0.88 1.00 1.00 1.00
71 0.42 0.54 0.66 0.78 0.90 1.00
AZ29E07DAP/EAP 59 0.38 0.49 0.65 0.80 0.95 1.00 1.00 1.00 1.00
(Dry Air 25) 63 0.38 0.54 0.68 0.80 1.00 1.00 1.00 1.00
67 0.35 0.52 0.66 0.79 0.92 1.00 1.00
71 0.32 0.45 0.58 0.73 0.85 1.00
All 9000 BTUH 59 0.42 0.59 0.77 0.93 1.00 1.00 1.00 1.00 1.00
units except 63 0.40 0.55 0.70 0.83 0.96 1.00 1.00 1.00
Dry Air 25 67 0.42 0.55 0.68 0.81 0.93 1.00 1.00
71 0.38 0.49 0.60 0.71 0.82 0.93
AZ29E09DAP/EAP 59 0.30 0.45 0.60 0.75 0.92 1.00 1.00 1.00 1.00
(Dry Air 25) 63 0.32 0.42 0.57 0.73 0.90 1.00 1.00 1.00
67 0.32 0.45 0.58 0.70 0.85 1.00 1.00
71 0.30 0.38 0.48 0.61 0.74 0.85
All 12000 BTUH 59 0.38 0.54 0.71 0.88 1.00 1.00 1.00 1.00 1.00
units except 63 0.40 0.54 0.68 0.81 0.93 1.00 1.00 1.00
Dry Air 25 67 0.41 0.54 0.67 0.80 0.93 1.00 1.00
71 0.36 0.47 0.58 0.71 0.82 0.93
AZ29E12DAP/EAP 59 0.30 0.45 0.60 0.75 0.92 1.00 1.00 1.00 1.00
(Dry Air 25) 63 0.30 0.41 0.56 0.72 0.89 1.00 1.00 1.00
67 0.31 0.44 0.57 0.70 0.84 0.99 1.00
71 0.31 0.40 0.50 0.61 0.73 0.84
All 15000 BTUH 59 0.38 0.54 0.71 0.88 1.00 1.00 1.00 1.00 1.00
units except 63 0.40 0.54 0.68 0.81 93.00 1.00 1.00 1.00
Dry Air 25 67 0.41 0.54 0.67 0.80 0.93 1.00 1.00
71 0.36 0.47 0.58 0.71 0.82 0.93
Capacities are nominal capacity
Cooling Sensible Heat Ratio (SHR) at Various Indoor WB and DB Temperatures