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H2O BOILER SERIES IOM Manual
2
1.1 Boiler/Water Heater Heat Exchanger
The H2O HC series is a gas-fired water tube boiler and water heater with nominal input
rating ranging from 600,000 to 2,500,000 Btu/hr.
Each unit consists of several stainless
steel coiled tubes (SA-249 Type 316L), 1" diameter and 0.049" wall thickness. The coils are
held parallel vertically by means of stainless steel ready rods and adjustment nut assemblies. The
inlets and outlets of the coils are welded to the manifolds pipes of the boiler.
Figure 2: HC Series Boiler
The heat exchanger assembly consists of a ceramic refractory, insulation plate and support ring
prevent hot gas escaping through the rear coil. The front hub and the front coil are connected and
support a high performance gas burner. The weight of the burner is counter balanced by the heat
exchanger.
The exact mechanism of heat exchange is an engineering phenomenon, involving combination of
counter flow, condensation heat recovery, fouling factors, and two-phase conditions. The working
of heat exchanger is a simple process. The gas burner ignites the gas and air mixture inside the
combustion chamber (the central space of the four coils). The hot gas particles cool and condense
as they pass through the gaps of the coils. The flue particles are gathered in the boiler chamber
(space outside the coils and within the liners) and exit through the chimney. The water flows in
the opposite direction of gas. Feed water enters the each coil at the perimeter of the heat
exchanger. The water picks up heat gradually as it circulates through the coil tubes and exits at the
center (near the central hubs). The counter flow design reduces the impact of thermal shock and
increases the heat exchanger life. The flue condensate is drained through a fitting at the bottom
right of the boiler.
D-VAC Sales Inc.
Email: dmann@dvachvac.com
Tel: (516) 256-3131
www.dvachvac.com
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