A steam coil is a heating heat exchanger that transfers heat from pressurized steam flowing through its tubes to warm air in HVAC systems. Steam coils are used in industrial facilities, hospitals, and large commercial buildings where steam is already generated for other processes, making it an economical heating source.
Technical Details
Steam coils typically operate at 5 to 30 psig (pounds per square inch gauge) with steam temperatures ranging from 220°F to 290°F. Heating capacity can exceed 1,000,000 BTU/h in large coils. The condensed steam (condensate) must be properly drained through a steam trap to prevent water accumulation that reduces efficiency and damages the coil. Air-side pressure drop typically ranges from 0.1 to 0.5 inches of water column.
Applications and Significance
Steam coils serve industrial manufacturing, hospitals, and district heating systems where steam availability reduces operational costs. They provide rapid, high-capacity heating for make-up air units and process conditioning. Proper condensate management through correctly sized steam traps prevents coil flooding and ensures reliable performance. Regular maintenance includes trap inspection and cleaning to optimize energy efficiency.