Advanced Radiant Systems Cool-Space CSW-12-VD Panduan Pemilik - Halaman 6
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Halaman CetakTo understand how the portable evaporative cooler works a basic understanding of psychrometrics is necessary.
Psychrometrics is the branch of thermodynamics devoted to the study of air and water vapor mixtures.
psychrometric chart is a graphical representation of properties of moist air. To illustrate how the unit operates, some of
the relevant properties are described in this section followed by a sample application.
Dry-bulb temperature is measured with a thermometer. Dry-bulb temperature lines on the psychrometric chart are
the vertical lines. The wet bulb temperature is the lowest temperature that can be reached by evaporating water
into the air.
DRY BULB TEMP
Dew-point temperature is the temperature to which a
given sample of air must be cooled so that moisture
will start condensing out of it. When air is saturated,
the dry-bulb, wet-bulb, and dew-point temperatures
will all be equal. The horizontal lines show the dew-
point temperature on the psychrometric chart.
Relative humidity is the amount of moisture in the air
relative to the amount of moisture the air would hold if
saturated at that dry-bulb temperature.
humidity is not the same as relative humidity and is not
used in HVAC design. This graph shows the relative
humidity curves on the psychrometric chart.
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HOW EVAPORATIVE COOLING WORKS
Percent
WET BULB TEMP
DEW POINT TEMP
The