Additional functions
48
Start function (ideal for tube collectors)
In the morning, solar power systems sometimes do not “start” quickly
enough because the warm heat transfer medium does not reach the collector sensor. Flat
collector panels and
forced-circulation vacuum tubes
generally lack sufficient gravitational
force.
The start function tries to release a rising interval while the collector temperature is con-
stantly monitored. The computer first determines the weather conditions based on the con-
stant measurements of the collector temperatures. It thus determines the right time for a
short rinsing interval to maintain the actual temperature for normal operation.
When the radiation sensor is used, the solar radiation is used for the calculation of the start
function (radiation sensor
GBS 01
- non-standard accessory).
The start function is deactivated ex works.
A 1
–
Activation
of start function.
A 1
means start function active,
A 0
=
start function deactivated
ew
= A 0
F 3
– Connection of a radiation sensor to sensor input
T3
.
F 0
means,
that the average temperature (long-term mean regardless of the weather)
is calculated instead of the radiation sensor value.
ew
= F 0
c20
–
radiation threshold
200W/m², above which rinsing is allowed.
Without a radiation sensor, the computer calculates the necessary tem-
perature increase for the long-term mean that launches rinsing from this
value.
ew
= 15
r15
–
Pump runtime
(rinsing time) in seconds. During this time, the
pump should have pumped roughly half of the content of the collector’s
heat transfer medium past the collector sensor.
ew
= 15
i35
– Maximum allowable
interval
between two rinses in minutes (exam-
ple: 35 minutes). This time is automatically reduced according to the
temperature increase after rinsing.
ew
= 20
n 4
–
Number of start attempts
(= counter). The system is automatically
reset for a start attempt if the last start attempt was more than four hours
ago.