DE DIETRICH NEO 2.1 - Manual (Page 9)

3 Technical description
3.1 Operating principle
The short-wave solar radiation (sunlight) striking the solar panel is
converted into heat by the selective coating on the absorber. From
there it is transferred by heat conduction to the absorber pipe and
carried by the heat-transporting fluid to the calorifier. The solar-panel
fluid heats the calorifier by means of the energy absorbed from the
sun and cools down itself in the process. The cooled heat-transporting
fluid then flows back to the solar panel in order to collect more solar
energy. An intelligent control system ensures that the circulation
system is only active when there is sufficient solar radiation, thus
optimising the collection of solar energy.
3.2 Technical specifications
3.2.1. Solar collectors
Length mm 1960
Width mm 1060
Height mm 70
Weight kg 34,45
Gross collector area A
G m 2 2,1
Inlet surface Aa
m
2 1,88
Absorber surface A
A m 2 1,90
Water content litres 1,2
Maximum operating pressure bar 10
Testing pressure bar 15
Optical efficiency η
o
0,773
Loss rating a
1 W/m 2 .K 3,676
Loss rating a
2 W/m 2 .K 0,0143
Stagnation temperature °C 180
Hydraulic connections mm 12
Pressure drop mbar See below
Fitted tilt angle
minimum/maximum
° 17 to 65
NEO 2.1 / SUN 211 3. Technical description
20/02/2013 - 300024195-001-02 8