TM 5-3895-374-24-2
Combustion gases in the firebox exit the
firebox through the heat exchanger. These
gases travel inside a set of densely packed
boiler tubes. The heat transfer oil passes
on the outside of these tubes in a multi-
pass
positive
forced
flow
pattern.
Extremely high forced convection heat
transfer coefficients are experienced in the
heat exchanger maintaining high oil flow
velocities in each pass of the flow pattern.
Automated welded techniques are highly
ductile low carbon steel maximize the
thermal fatigue life of the heat exchanger
Combustion from the burner occurs in the
firebox. The hot gases caused by
combustion must pass twice through the
firebox before exiting through the
exchanger, which is located at the same
end of the firebox as the burner. The
firebox jacket contains flow controls rings,
which force the heat transfer efficiently and
eliminating hot spots. The thermal or heat
transfer resistance which exists between
the combustion gases and the heat transfer
oil is minimized. The is accomplished by
using materials which have a high thermal
conductivity and optimum thickness which
do not compromise on the structural
integrity of the firebox. The Firebox heat
transfer surface area is fully utilized.
The micro processor based temperature
controller is a digital, single, loop device
that provides the operator with maximum
control over many functions of the Heater.
The SERIES 2000 works with the burner for
efficient full modulation fuel flow while
allowing the contractor to have a "tamper
proof" temperature setting for the Hot Oil
Heater.
page 3-918
