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wcon_sensor
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F lo w C o n S e n s o r / S e n s o r H E
3
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1. Pump station with integrated controller
• With Grundfos Direct Sensors
TM
• High efficiency pump (product version
F lo w C o n
S e n s o r
HE) funded by a number of national incentive
programs
• Precise measurement of temperature, pressure and
flow rate
• Advanced error diagnostic system
• Heat quantity measurement
• Full graphic display
• RESOL VBus
®
The
F lo w C o n S e n s o r / S e n s o r H E
is a complete
pump station that is delivered with all the electric and
hydraulic core components of the solar system, including
the sensors required, pre-assembled in one easy-to-mount
unit. The separate installation of collector and store sen-
sors is not required.
The
F lo w C o n S e n s o r / S e n s o r H E
offers the effi-
ciency and the functional range of a standard solar system
while being much more reliable and requiring less instal-
lation effort.
The station is equipped with important components and
safety assemblies for operating the solar thermal system
:
• Ball valves in flow and return in combination with check
valves to prevent gravity circulation
• Digital sensors for measuring temperature, pressure
and flow rate
• AirStopp for manual bleeding of the solar thermal system
• Manometer for displaying the system pressure
• Safety valve to prevent inadmissible overpressure
• High-efficiency pump (
F lo w C o n S e n s o r H E
only)
In order to optimise the time frame, the algorithm takes a
range of parameters into account, e. g. the tilt and the ori-
entation of the collector, the geographical position as well as
the season. Furthermore, the testing time frame is adjusted
to the typical identified store temperature.
Sequence of control phases of the
F lo w C o n S e n s o r
:
Loading
yes
no
no
30 min pause
Identification
The testing time frame begins with an identification
phase. The controller activates the pump at minimum
speed to check whether a solar gain might be possible.
If a solar gain is possible, the stabilising phase is started,
during which the pump remains active and the controller
continues to test for the possibility of an efficient solar gain.
The pump station commences normal operation, i. e. it
enters the loading phase. The store is loaded as long as
an efficient solar gain is possible.
yes
Stabilising
What makes the
F lo w C o n S e n s o r
so special is its con-
trol algorithm. For each individual operating day, it calculates
a specific time frame during which it is sensible to start the
pump for testing purposes. The integrated sensors then
identify the collector and store temperatures by experi-
mentally activating the pump.
If no solar loading is possible, a 30 min pause is run in
order to give the collector time to heat up.
Theoretical irradiation on
the collectors
Testing time frame
Pause
6:00
12:00
18:00