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Q: Transfer of heat is mainly due to conduction, convection and radiation in –
  • A. Insulated pipes carrying hot water
  • B. In the refrigerator
  • C. In boiler furnaces
  • D. Actual condensation in a condenser is the transfer of heat
Correct Answer: Option C - Heat transfer within steam boiler furnaces is accomplished by the three methods, radiation, convection and conduction. The heating surface in the furnace area receives heat primarily by radiation. The remaining heating surface in the steam boiler receives by convection from the hot gases. Heat receives by the heating surface travels through the metal by conduction, heat is then transferred from the metal to the water by convection.
C. Heat transfer within steam boiler furnaces is accomplished by the three methods, radiation, convection and conduction. The heating surface in the furnace area receives heat primarily by radiation. The remaining heating surface in the steam boiler receives by convection from the hot gases. Heat receives by the heating surface travels through the metal by conduction, heat is then transferred from the metal to the water by convection.

Explanations:

Heat transfer within steam boiler furnaces is accomplished by the three methods, radiation, convection and conduction. The heating surface in the furnace area receives heat primarily by radiation. The remaining heating surface in the steam boiler receives by convection from the hot gases. Heat receives by the heating surface travels through the metal by conduction, heat is then transferred from the metal to the water by convection.