Expansion Tank - De Dietrich D 230 Folleto De Información Sobre El Sistema

IN
OUT
IN
m2 5
l/h*m2 15 20 30
l/h 75 100 150
inside DN
DN13 DN13 DN13
OUT
7.5
40 60 15 20 30
200 300 113 150 225
DN16 DN16 DN13 DN13 DN16
Temperature probe
Temperature sensors should be installed in such a way as to ensure good
contact with the measuring point. They should be insulated from the in-
fluence of environmental conditions and installed against the flow of the
fluid The temperature probe will be installed at the hottest point of the
output of the corresponding row.
Ensure correct installation of the thermal sensor in the collector.
Secure the sensor wire with a suitable material to prevent its ac-
cidental removal from the collector.
Special attention must be paid to the maximum temperatures rea-
ched in the last collector of the row as the solar liquid may beco-
me deteriorated.
Pipes
The pipes will be as short as possible and allow for complete draining.
Horizontal sections will have a minimum slope of 1%. The pipes of the
primary circuit may be made of stainless steel or copper and have threa-
ded, welded or flanged joints. Outdoor pipes must have external pro-
tection to enable them to withstand the effect of the weather and avoid
transport losses.
The recommended sizes of pipe to maintain a pressure drop of less than
2.5 mbar per linear meter are:
12.5
40 60 15 20 30
300 450 188 250 375
DN16 DN20 DN13 DN16 DN20

Expansion tank

An expansion tank will be installed in the primary circuit close to the hy-
draulic unit, in line with the size and characteristics of the installation. The
size of the expansion tank will be calculated according to DIN 4757, EN
12977 or VDI 6002. This expansion tank will be installed:
1. Such that the temperature of the water touching the membrane is as
low as possible.
2. Preferably in the pump suction line.
3. Cut-off elements should not be installed between the expansion tank
and the system.
Pumps
Where possible, the pump should be assembled in the cooler parts of the
circuit, ensuring that there is no cavitation, and always with a horizontal
axis of rotation.
To calculate the size of pump to install, we must take account of the
pressure drop in the collectors installed, as well as pipe losses. The cha-
racteristic curves of pressure drop for the solar collectors are:
11
11
25
40 60 15 20 30
500 750 375 500 750
DN20 DN25 DN20 DN20 DN25
UK
40 60
1000 1500
DN25 DN32