HD32.3
- 6 -
V1.4
2.
WORKING
PRINCIPLE
Microclimate
term means the environmental parameters that influence the thermal exchanges be-
tween the being and the environments inside limited places and that determinate the so-called
“thermal well-being”.
The micro-environmental weather factors together with your own job influences a series of your
biologic responses connected to well-being situations (Comfort) or thermal uneasiness
(Discom-
fort).
In fact, the human body tries to keep the thermal balance in equilibrium conditions in order to keep
the body temperature on optimal values.
HD32.3 detects the following sizes:
During the visualization of
WBGT index
:
•
t
nw
:
wet bulb with natural ventilation temperature probe
•
t
g
:
globe thermometer temperature
•
t
a
:
ambient temperature
During the visualization of
PMV index
:
•
v
a
:
air speed
•
t
g
:
globe thermometer temperature
•
t
a
:
ambient temperature
•
rh
:
relative humidity
In addition to the direct measurements made with the probes connected to the instrument can di-
rectly calculate and visualize, in WBGT measurement, the
WBGT index in presence or absence
of solar radiation
, in the PMV measurement,
the medium radiant temperature t, the Predicted
Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD).
2.1.1 WBGT Index
WBGT
(Wet Bulb Globe Temperature) - wet bulb and globe thermometer temperature - is one of
the indexes used for determining the thermal stress to which is submitted a being in a warm envi-
ronment. It represents the value, with reference to the metabolic waste connected to a special job,
over which the being is in a thermal stress condition. WBGT index combines the temperature meas-
urement of natural ventilation wet bulb
t
nw
with the Glob thermometer
t
g
and, in some situations,
with the air temperature
t
a
.
The formula for the calculation is the following one:
•
inside and outside the buildings in absence of solar irradiation:
WBGT
close environments
= 0,7 t
nw
+ 0,3 t
g
•
outside the building in presence of solar irradiation:
WBGT
external environments
= 0,7 t
nw
+ 0,2 t
g
+ 0,1 t
a
where:
t
nw
=
wet bulb temperature with
natural ventilation
t
g
=
globe thermometer temperature;
t
a
=
air temperature.
Summary of Contents for HD32.3
Page 4: ...HD32 3 4 V1 4 HD32 3 WBGT PMV PPD indices...
Page 52: ...HD32 3 52 V1 4 12 PRINTING OF THE MEASUREMENT REPORT Norm ISO 7243 Norm ISO 7243...
Page 53: ...HD32 3 53 V1 4 Warm environments Norm ISO 7243...
Page 54: ...HD32 3 54 V1 4 Warm environments Norm ISO 7243 Norm ISO 7243...
Page 55: ...HD32 3 55 V1 4 Warm environments Norm ISO 7243...
Page 56: ...HD32 3 56 V1 4 Warm environments Norm ISO 7243...
Page 57: ...HD32 3 57 V1 4 Warm environments Norm ISO 7243...
Page 58: ...HD32 3 58 V1 4 Moderate environments Norm ISO 7730 Norm ISO 7730...
Page 59: ...HD32 3 59 V1 4 Moderate environments Norm ISO 7730...
Page 60: ...HD32 3 60 V1 4 Moderate environments Norm ISO 7730...
Page 61: ...HD32 3 61 V1 4 Moderate environments Norm ISO 7730...
Page 62: ...HD32 3 62 V1 4 Moderate environments Norm ISO 7730...
Page 63: ...HD32 3 63 V1 4 Moderate environments Norm ISO 7730...
Page 64: ...HD32 3 64 V1 4 Moderate environments Norm ISO 7730...
Page 71: ......
