Introduction. WNS series horizontal internal combustion boiler is classic 3-pass wetback oil/gas fired boiler. After fuel is atomized by burner, flame is full of the wave furnace and transfer heat via furnace wall, called 1st pass; the high temperature flue gasses are collected in reversal chamber and then enter 2nd pass, which is grooved tube bundle area through heat convection, air
Good condensing boilers can attain energy efficiency of 90% or more. Boiler Efficiency Ratings. A boiler’s efficiency is measured by annual fuel utilization efficiency (AFUE). This is the ratio of the boiler’s annual heat output compared to the total annual fossil fuel energy it consumes.
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For an 80,000 btu/hr load (a typical larger old frame home in most Rust belt cities in the US), you could probably pipe up the system with 1 inch, use 3/4 branches to the boiler and 1 inch for the boiler and boiler bypass loop, with valves to balance the flow, just like in most installation manuals.
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3-pass Steam Boiler Wholesale, Steam Boiler Suppliers - Alibaba.com offers 2,410 3-pass steam boiler products. About 99% of these are boilers, 1% are boiler parts, and 1% are other food processing machinery. A wide variety of 3-pass steam boiler options are available to you, such as once through, natural circulation.
A 3-pass firetube boiler design consists of three sets of horizontal tubes, with the stack outlet located on the rear of the boiler. A downdraft design keeps the cooler water from having an effect on the hot surfaces within the boiler.
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