Turndown has been a trending topic in the boiler industry for many years but is it as important as we think?
What is boiler turndown? Boiler turndown is the ratio that a boiler can fire at full capacity to its lowest firing rate before the system shuts down. For example, if a boiler is a 1 million BTU boiler that can fire as low as 250,000 BTUs, then the boiler has a 4:1 turndown ratio.
Boiler turndown certainly has an effect on efficiency, but for each application that effect could be different. There are three major elements that are impacted by a boiler’s turndown; boiler loads, operating cycles, and overall efficiency.
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