Maximizing Condensing-Boiler-System Efficiency

Moe, Eric
September 2007
Heating/Piping/Air Conditioning Engineering;Sep2007, Vol. 79 Issue 9, p64
The article discusses how heating-water return temperature (HWRT) can be achieved with industrial-grade pressure-independent control. When coil flow control is optimized, partload ΔT will increase significantly above design, and HWRT will drop, making it possible to dramatically increase the hours boilers condense in operation. Resetting the heating-water supply temperature may lower boiler and distribution-system heat loss and increase tolerance of poor control. Pressure-independent control valves reduce simultaneous heating and cooling.


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