Pressure drop in collectors
– Calculations of Demokritos Institute
Collector: ST 2000 selective (2,10 m
2
,26 C)
Collector: ST 2500 selective (2,61 m
2
, 24 C)
For the systems 150
– 500, BL1 or BL2, the parallel connection of the solar
Collectors is recommended
In this case the pressure drop in one collector is about equal to the pressure
drop in the whole row of collectors for the supply that is equivalent to the total
of installed square meters.
The required flow of the pump for the forced circulation is approximately 40 - 80
liters / h for each installed square meter and depends on the design of each
installation.
Example:
For one system 300 E/BL1 with 3 collectors ST-2000 in a parallel connection,
total surface area 6,30m
2
, we can choose a medium flow rate of 60lt/h
per square meter of installed collectors. This means that the necessary flow
rate of the pump must be 60lt/hm
2
x6,30m
2
=378lt/h approximately. When
dividing by 3 (number of collectors), we obtain 126lt/h. When transforming to
liters/second (by dividing by 3.600) we will have 0,035 liters/second. From the
above graph of pressure drop of the collector St 2000, we estimate that
the flow rate of 0,035 liters/second corresponds to a pressure drop of
approximately 100 Pa.
15
hot
water
outlet
cold water inlet
or
hot
water
outlet
cold water inlet
Mass flowrate (Kg/s)
Mass flowrate (Kg/s)
Pre
s
s
o
re
Dr
op
(PA
)
Pre
s
s
o
re
Dr
op
(PA
)
Summary of Contents for 1000/BL1
Page 1: ......
Page 12: ...CLIMATIC DATA OF SELECTED WORLD CITIES 12...
Page 13: ...Energyoutputofthecollectorinseveralcitiesoftheworld inkWh m2 13...
Page 30: ...Assembly diagram of the support base for one 30...
Page 34: ...Assembly diagram of the support base for three 34...
Page 37: ...Connectionofcollectorsandaccessories 37...
Page 39: ...HYDRAULIC KIT 39...
