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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 18 Function block: Solar d.h.w. 15.03.2011
18.3.6 Storage tank recooling
After overtemperature protection for the collector has been active, function "Stor-
age tank recooling" discharges the d.h.w. storage tank to bring it down to a lower
temperature level.
Storage tank recooling is effected via the collector’s surface. For that, the collector
pump is activated, thus transferring heat from the storage tank to the collector to be
emitted to the environment via the collector’s surface.
The recooling setpoint (TRk) is set to a fixed 80 °C. The switching differential for
recooling (SD
ON
) corresponds to the value of the switch-on differential (operating
line 201) of charging control, but is limited to a minimum of 3 K for recooling.
1 K
1 K
2541D10
ON
OFF
2 K
TRk
SD
ON
Temperature differential ON ON / OFF Collector pump
TRk
Recooling setpoint
T
Temperature
TSp
Storage tank temperature
t
Time
TKol
Collector temperature
If the storage tank temperature lies at least 2 K above the recooling setpoint and
by at least the temperature differential ON above the collector temperature, the
collector pump is activated:
TSp > TRk + 2 K and TSp > TKol + SD
ON
If the collector temperature rises to a level of 2 K below the storage tank tem-
perature, the collector pump is deactivated:
TKol > TSp – 2 K
If the storage tank temperature reaches a level of 1 K above the recooling set-
point, the function is ended:
TSp < TRk + 1 K
86


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