Technical Manual

Vitosol 200-T, SPE Technical Data
11
5693 556 v1.0
Flow Rate
High-flow mode
High-flow mode results in low temperature spread across
the collectors, but may require bigger pump and pipe sizes
for large systems. High-flow mode is best suited for small
scale systems consisting of less than 60 tubes.
Medium and low-flow modes
Medium and low-flow modes result in smaller pipe and
pump sizes, but higher temperature spread across the
collectors. Low-flow and medium-flow modes should
be used for larger collector arrays consisting of greater
than 60 tubes, to avoid high friction losses and high fluid
velocities within the collector, and reduce the size of
supply and return piping requirements.
Use the charts below to determine the required flow rate,
based on the size of the collector or collector array.
Flow High flow mode
USG/min (L/min)
Medium flow mode
USG/min (L/min)
Low flow mode
USG/min (L/min)
Model 1.63m
2
(9 tube collector) 0.47 (1.8) 0.35 (1.33) 0.26 (1.0)
Model 3.26 m
2
(18 tube collector) 0.95 (3.6) 0.70 (2.65) 0.53 (2.0)
Individual collector flow rates
Recommended collector array flow rates
Flow High flow mode
USG/min (L/min)
Medium flow mode
USG/min (L/min)
Low flow mode
USG/min (L/min)
9 tube collector array (model 1.63m
2)
0.47 (1.8) -- --
18 tube collector array (model 3.26 m
2)
0.95 (3.6) -- --
27 tube collector array* 1.4 (5.4) -- --
36 tube collector array* 1.9 (7.2) -- --
45 tube collector array* 2.4 (9.0) -- --
54 tube collector array* 2.9 (10.8) -- --
72 tube collector array* -- 2.8 (10.6) --
90 tube collector array* -- 3.5 (13.3) 2.7 (10.0)
108 tube collector array* -- -- 3.2 (12.0)
* Collector arrays are combinations of collector model 1.63m
2
and/or model 3.26 m
2.
SPE collectors have minimum required flow rates (low-
flow mode), and maximum flow rates (high-flow mode).
The collectors must operate within this range, and the
designer must choose a flow rate based on the specific
parameters of the system.
Design Information