TM 5-3895-374-24-2Combustion gases in the firebox exit thefirebox through the heat exchanger. Thesegases travel inside a set of densely packedboiler tubes. The heat transfer oil passeson the outside of these tubes in a multi-pass positive forced flow pattern.Extremely high forced convection heattransfer coefficients are experienced in theheat exchanger maintaining high oil flowvelocities in each pass of the flow pattern.Automated welded techniques are highlyductile low carbon steel maximize thethermal fatigue life of the heat exchangerCombustion from the burner occurs in thefirebox. The hot gases caused bycombustion must pass twice through thefirebox before exiting through theexchanger, which is located at the sameend of the firebox as the burner. Thefirebox jacket contains flow controls rings,which force the heat transfer efficiently andeliminating hot spots. The thermal or heattransfer resistance which exists betweenthe combustion gases and the heat transferoil is minimized. The is accomplished byusing materials which have a high thermalconductivity and optimum thickness whichdo not compromise on the structuralintegrity of the firebox. The Firebox heattransfer surface area is fully utilized.The micro processor based temperaturecontroller is a digital, single, loop devicethat provides the operator with maximumcontrol over many functions of the Heater.The SERIES 2000 works with the burner forefficient full modulation fuel flow whileallowing the contractor to have a "tamperproof" temperature setting for the Hot OilHeater.page 3-918
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