Air Source Heat Pump: A Replacement For A Gas Boiler
The supply temperature of the hot water for a heat pump is significantly lower than for a gas boiler. So the output of the radiators has to be bigger and the flow rate through them has to be higher. Since many installed radiators are already higher …
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Boiler Combustion - CleanBoiler.org
Flue gas recirculation, or FGR, is the most effective method of reducing NOx emission from industrial boilers with inputs below 100 MMBtu/hr. FGR entails recirculating a portion of relatively cool exhaust gases back into the combustion process in order to lower the flame temperature and reduce NOx formation.
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