Ormandy Group Norland, Техническое руководство

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NORLAND
2
1 GENERAL
The NORLAND boilers have a horizontal through-flame combustion chamber and a vertical condensing sec-
tion of a special design, in stainless steel type AISI 316 Ti. These elements are immersed in water contained
in a horizontal boiler drum with a vertical column to which the system inlet and outlet connections are fitted.
These boilers reach very high efficiency levels as the flue gases not only are released at a temperature little
higher than that of the system return water, but also a large part of the water vapour contained in the flue
gases is condensed, recovering the latent heat of condensation.
The particular flame path (through the combustion chamber without inversion) limits as much as possible the
formation of Nitrogen Oxides (NOx) that form when the flame remains at high temperature in the combustion
chamber for long periods.
The Norland boilers place no limit on the return water temperature, and reach the highest performance when
used with floor panel heating systems in which the return temperature is lower than 58C. At higher tempera-
tures, condensation does not occur and so the recovery of the latent heat contained in the water vapour, pre-
sent in the flue gas, is impossible. The efficiency of the boiler remains in any case high (97%) even with tradi-
tional high-temperature heating systems (
∆
t 82/71° C ) .
The very high efficiency due to the complete recovery of the heat content of the fuel and to heavy
thermal insulation of the boiler, using high density glass wool, allow classification of the Norland
boilers as “4-Star - very high efficiency” as to the Efficiency Directive 92/42/CEE..