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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 9 Function block: Space heating 15.03.2011
The basic settings during the commissioning phase are made based on the plan-
ning documentation or according to local practices.
They are made on operating lines 14 and 15:
Op. line Setpoint
14 Flow temperature setpoint at an outside temperature of 15 °C
15 Flow temperature setpoint at an outside temperature of –5 °C
2474Z06
120
110
100
90
80
70
60
40
30
20
10
20
15
10
5
0
-5
50
-10 -15 -20 -30
BZ 14
BZ 15
T
Vw
T
A
Heating curve diagram showing the basic settings
BZ 14 Setting operating line 14, flow temperature setpoint at an outside temperature of 15 °C
BZ 15 Setting operating line 15, flow temperature setpoint at an outside temperature of –5 °C
T
A
Outside temperature
T
Vw
Flow temperature setpoint
9.6.3 Deflection
The heat losses of buildings are proportional to the difference of room temperature
and outside temperature. By contrast, the heat output of radiators does not in-
crease proportionally when the difference of radiator and room temperature in-
creases. For this reason, the radiators' heat exchanger characteristic is deflected.
The heating curve's deflection takes these properties into consideration.
In the range of small slopes (e.g. with floor heating systems), the heating curve is
practically linear – due to the small flow temperature range – and therefore corre-
sponds to the characteristic of low temperature heating systems.
Slope ”s” is calculated according to the following formula:
T
Vw(5)
T
Vw(+15)
s = —————————
20 K
s Heating curve slope
T
Vw(5)
Flow temperature setpoint at an outside temperature of 5 °C
T
Vw(+15)
Flow temperature setpoint at an outside temperature of 15 °C
The heating curve is valid for a room temperature setpoint of 20 °C.
39


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