Hot Oil Boilers
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Hot Oil Boilers or Thermal Oil heaters as they are sometimes known are made with coils of seamless tubes. The thermal fluid is heated during the flow through the tubes. The heat is transferred to the oil as radiant heat in the combustion chamber, where the inner cyclindrical tube coil and a flat tube coil forms the chamber wall and the bottom respectively. The combustion gasses are hereafter cooled in the outer convection part, as the gasses pass the space gab between the two tube coils.
The thermal design ensures a modest volume of the thermal fluid relative to the size of the heater, and allows unlimited thermal expansion due to the high fluid temperature. Thermal fluid heaters typically operate up to 350degC at atmospheric pressure and remain pumpable down to minus 20degC, and lower with special fluids, which makes it a solution suitable for a multitude of applications.
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