2 Technical description
6 720 646 864 (12/2010) – Technical guide Logano GE315, GE515 and GE615
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2.2 Thermostream technology of the Ecostream cast iron boilers
2.2.1 Function principle
Thermostream technology is based on the mixing of cold
return water with hot flow water inside the boiler. Return
temperature raising takes place in the upper section of the
boiler. The return water therefore reaches a higher
temperature level before it flows to the heating surfaces.
A thermal shock to the heating surfaces is consistently
prevented, even if there is a sudden inflow of cold return
water.
No additional measures are required to raise the return
temperature or maintain a minimum flow rate under certain
operating conditions.
In steady operation, the surface temperatures on the hot
gas side are above the dew point of the hot gases. No
condensate is formed in the combustion chamber or
secondary heating surfaces. As a consequence,
corrosion inside the boiler is prevented.
The combustion chamber and heating surfaces receive a
flow of boiler water through natural circulation, and they
continually extract heating energy from the hot gas flow.
This results in high energy utilisation, stable operating
characteristics and simple hydraulic connections.
Thermostream technology means the boiler is
constructed with single-skin direct heating surfaces,
making it extremely compact.
Fig. 2 Thermostream technology taking the Ecostream cast iron boiler Logano GE515 as an example
VK Boiler flow
1 Boiler section with heating water channels
2 Combustion chamber
3 Secondary heating surfaces
4 Feed pipe for return water
6 720 644 097-01.1il
VK
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