A high turndown ratio is important for boilers that are required to operate over a wide range of capacities. A boiler with a higher turndown ratio will usually handle fluctuating loads more efficiently than one with lower turndown.
A Boiler's burner will modulate or "turn down" as the demand for hot water or steam decreases, in an attempt to meet the required load. The turndown ratio tells you the minimum output the boiler can achieve before turning off and then cycling on and off frequently.
If the demand goes below the burner's minimum turndown, the boiler will cycle off until there's more demand. This results in the system cycling on, running for a brief period and then cycling off again. Every time this happens, the boiler must go through a pre-purge, a firing interval and then a post-purge. This is extremely inefficient.
How an Incorrect Turndown Ratio
Affects Boiler Efficiency
Energy Loss & Waste
Inconsistent Steam Pressure
Excessive Wear on Components
Premature Equipment Failure
Modular Systems For Fluctuating Load Demands
A Modular or Hybrid system can be a good solution for meeting varying load demands. Using a mix of different types and sizes of boilers allows for larger boiler to handle high load needs while a smaller, more efficient boiler covers lower demands. And, each boiler can be turned down when not in use.
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