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54
AST 14 C 257/00
The above curves refer to a fictitious amb ient temperature of 20°C. If a temperature other
than 20°C is requested, all the curves move in a parallel.
Example of a curve shift w ith P10=1.5, w ith a fictitious ambient temperature from 20°C to 25°C:
Choosing a curve can
either be performed mentally
or using a mathematical formula. In either case it is necessary to check the temperature
variations and choose the exact curve.
Mental calculation – take a real outside temperature value as a reference and associate
it with the required flow value. Then choose the nearest curve.
Example:
an outside temperature of -4°C requires a flow temperature of 62°C, e.g. curve: 1.5
+5
-5
CURVE
OUTSIDE TEMPERATURE
CURV
E
F
L
O
W
T
E
M
P
E
RAT
URE
