Controlling Multiple Modulating Boilers

Clerico, Vincent
March 2007
Heating/Piping/Air Conditioning Engineering;Mar2007, Vol. 79 Issue 3, p54
The article reports on the efficiency of multiple modulating boilers. According to the author, the mass capacity and efficiency of boilers determine the level of their operation. He notes that modulating boilers have turndown ratios or the minimum stable heat-output rate divided to the full heat-output rate. Parallel loading involves the operation of several boilers at lower firing rates. The use of control that is flexible to different modes and conditions can help choose modulating boilers.


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