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TRG-TRC001-EN 11
period one
The Psychrometric Chart
notes
Additionally, the dew-point temperature does not change as the dry-bulb
temperature changes, provided that the moisture content of the air remains the
same. Merely heating the air does not change its moisture content. Therefore,
as the air is heated, its condition will move horizontally along a constant
humidity-ratio line.
In this example, heating 60°F saturated air moves the air condition along a
horizontal humidity-ratio line that corresponds to a constant 77.56 grains of
moisture per pound of dry air.
Horizontal lines can be drawn from each saturation point across to the right
side of the chart. A horizontal line can be provided for each humidity-ratio
value.
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Figure 19