Velleman WS2800 Software User’s Guide - Manual (Page 23)

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TEMPERATURE AND HUMIDITY
The temperature and humidity section of the main dialog shows you:
•
The current indoor and outdoor temperature.
•
The current indoor and outdoor humidity
levels.
•
Min and Max values for both indoor and
outdoor temperature.
•
Min and Max values for both indoor and
outdoor humidity.
To view or reset the min or max values for any of the temperature properties, please refer to the Min Max Values
section .
To view or set alarm triggers for any of the temperature properties, please refer to the section on Setting Alarms .
DEWPOINT TEMPERATURE
WHAT IS THE “DEWPOINT”?
The dewpoint is the temperature to which a given parcel of air must be cooled, at constant barometric pressure,
for water vapor to condense into water. This condensed water is called dew, and so the condensation or saturation
temperature is referred to as the dewpoint.
THE RELATIONSHIP BETWEEN DEWPOINT, TEMPERATURE AND RELATIVE HUMIDITY
A high relative humidity indicates that the dew point is closer to the current air temperature. Relative humidity of
100% indicates the dew point is equal to the current temperature and the air is completely saturated with water.
When the dew point remains constant and temperature increases, relative humidity will decrease.
Lower dew points (less than 50 °F) usually go along with lower ambient temperatures. A lower dew point can go
along with a high temperature only at extremely low relative humidity, allowing for relative effective cooling.
HOW DOES THE DEWPOINT AFFECT ME?
Humans tend to be uncomfortable with a higher dewpoint (anything greater than 60 °F). At this level, the body
begins to perspire and produce sweat to cool down. High relative humidity, and consequently a high dewpoint, will
prevent the evaporation of sweat and reduces evaporative cooling. When the body can’t cool itself, it starts to
overheat, and we feel hot and uncomfortable. Discomfort also exists when dealing with low dew points. The drier