TM 5-3895-374-24-2
HEAT TRANSFER FLUID CIRCULATION
CET heaters are designed to transfer as much heat (created by burning diesel fuel or gas) as possible to the
heat transfer fluid being circulated through the closed system by the circulating pump. When the heat transfer
fluid is returned to the heater, it is first circulated through the heat exchanger to absorb heat from the hot gases
passing inside the firetubes. Next, the heat transfer fluid is circulated around the firebox in a helical fashion
caused by the flow control rings. The heat transfer fluid then exits the firebox and is again circulated through the
closed system. Note that the heat transfer fluid never has to change directions when it has heat applied to it.
This is important because it reduces the possibility of hot spots and, as a result, metal fatigue.
(page 3-912)
