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Boiler horsepower (Bhp)

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  • Boiler horsepower (Bhp)

    can OC convert a boiler rating from units of boiler horsepower (Bhp) to heat input (MMBtu)

    1 Bhp @ 100% fuel to steam efficiency = 33,446 BTU

    Boilers are not 100% efficient in converting fuel input to steam output - it varies from 75-90%.

    1 Bhp @ 80% fuel to steam = 33,446/.8 = 44,807.5 BTU

    a 750 Bhp 80% boiler = 31,355,636 Btu

  • #2
    Re: Boiler horsepower (Bhp)

    1 BHp is 33,475 BTU/Hr
    33,446/.8 = 41807.5 BTU not 44,807 you calculated but that's factor for BHP is incorrect anyhow.
    33,475/.8 is 41,843.75
    750 BHp to HP is 31,382,812.5 BTU

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    • #3
      Re: Boiler horsepower (Bhp)

      How is your 80 percent get more btu's than your 100 percent? Multiply by .8 instead of dividing.

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      • #4
        Re: Boiler horsepower (Bhp)

        1 bhp=33475, @ 80% = 26,780*750=20,085,000

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        • #5
          Re: Boiler horsepower (Bhp)

          How many BTU's in one boiler HP

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          • #6
            Re: Boiler horsepower (Bhp)

            Boiler horsepower is based on the output capacity of the boiler. therefore, if the boiler is 80% efficient, the gas burned is calculated by dividing the boiler horsepower or BTUH output of the boiler by the efficiency. One horsepower is equal to 33,475 BTUH output.

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            • #7
              Re: Boiler horsepower (Bhp)

              Everyone is missing the point on the 80% efficient example. 80% efficient means you need to input 100 BTUs of energy (natural gas, oil, coal, etc ) and your output is 80 BTUs worth of steam. So to produce 100 units of steam energy, your boiler will actually burn 125 units of fuel energy.

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              • #8
                Re: Boiler horsepower (Bhp)

                Concerning "everyone's missing the point": This comment supposes that the boiler's burner has the ability to deliver and burn the 20% greater fuel BTU's, found in each fuel unit consumed, required to produce 100% output capactiy. Isn't the Boiler's hp output rating based on the expected boiler efficiency and BTU content of fuel consumed in the first place? And if so then the conversion from hp to BTUH boiler "outpout" is one to one or 100% as long as the fuel BTU content utilized remains constant.

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                • #9
                  Re: Boiler horsepower (Bhp)

                  Originally posted by Unregistered View Post
                  Concerning "everyone's missing the point": This comment supposes that the boiler's burner has the ability to deliver and burn the 20% greater fuel BTU's, found in each fuel unit consumed, required to produce 100% output capactiy. Isn't the Boiler's hp output rating based on the expected boiler efficiency and BTU content of fuel consumed in the first place? And if so then the conversion from hp to BTUH boiler "outpout" is one to one or 100% as long as the fuel BTU content utilized remains constant.
                  The boiler horsepower is based on steam output, not fuel input.

                  However in this quote from Wikipedia on boiler horsepower, the operative words are "entirely obsolete." It has little connection with the power a modern steam engine can make from that steam. It would be better described in watts, BTUs, or something.
                  The amount of power that can be obtained by a steam engine or steam turbine based on boiler horsepower varies so widely that use of the term is entirely obsolete for these purposes. The term makes no distinction as to the steam pressure or temperature which is produced (both of which significantly influence engine/turbine output); it merely defines a thermal output of a boiler. Smaller steam engines often require several boiler horsepower to make one horsepower, and modern steam turbines can make power with as little as about 0.15 hp (boiler) thermal output per actual horsepower developed.

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                  • #10
                    Re: Boiler horsepower (Bhp)

                    Originally posted by Unregistered View Post
                    How is your 80 percent get more btu's than your 100 percent? Multiply by .8 instead of dividing.
                    its mean that we need more power to evaporate the water

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