To know how much natural gas or fuel oil is needed to meet your steam load, use the BTU requirement formula. of water per hour per horsepower is a standard rule of thumb for calculating make-up water. Heat Loss: Conclusion BTU/hr Needed=Boiler Horsepower (BHP)×33,479BTU/hr Needed equals Boiler Horsepower (BHP) cross 33 comma 479 Boiler efficiency measures how effectively the fuel energy is converted into usable steam energy. The direct method compares the energy output (steam) to the energy input (fuel).
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