Gauge Pressure And Absolute Pressure; Dry Bulb Temperature, Wet Bulb Temperature And Black Ball Temperature - Autool Lm150 Benutzerhandbuch

Gauge
pressure and
absolute
pressure
Dry bulb
temperature,
wet bulb
temperature
and black
ball tempera-
ture
●
Gauge pressure:
Gauge pressure refers to the pipeline pressure, refers to the
pressure measured by pressure gauges, vacuum gauges,
U-shaped tubes, etc., also known as relative pressure. The
"table pressure" starts with atmospheric pressure and the
symbol is Pg.
●
Absolute pressure:
The pressure directly acting on the surface of a container or
object is called "absolute pressure", the absolute pressure
value is absolute vacuum as a starting point, the symbol is
PABS (ABS is a subscript) and the absolute pressure is atmo-
spheric pressure + gauge pressure.
●
At atmospheric pressure, the gauge pressure is 0 and the
absolute pressure is 1.013bar.
● Dry bulb temperature:
The temperature measured by ordinary thermometers.
● Wet bulb temperature:
A wet cloth is wrapped around the thermometer, and the
temperature indicates a drop due to the evaporation of water.
The temperature at this time is called the wet-bulb tempera-
ture.
● The device, which has both the dry ball thermometer and the
wet bulb thermometer, is called the dry humidimeter, which can
be used to measure the relative humidity in the atmosphere.
● Black ball temperature:
Also called actual temperature, it indicates the actual sensory
temperature expressed by temperature when a person or an
object is combined with radiant heat and convective heat in a
radiant heat environment.
The black ball temperature measured is generally higher than
●
the ambient temperature, which is the air temperature.
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