This recent Bowen project resulted in a dramatic improvement in efficiency and profit because of much shorter "furnace batch" cycle time. The system involved two individual heat exchangers linked by "Therminol" heat transfer fluid.

One exchanger was inside the furnace to absorb the heat, with high-temperature furnace air directed through the exchanger by an externally-driven fan.

A pump circulated the Therminol to the second unit outside the furnace, with heat from there dissipated to the stack by an associated fan.

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