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1MMBTU can produced 293kW

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  • 1MMBTU can produced 293kW

    Hi

    i want to know that what is the guarantee that 1MMBTU can produced 293kW in case of Natural gas,
    and what is the guarantee that 1MMBTU energy contains 1.055 GJ of energy .

    thanks

  • #2
    Originally posted by alikhan View Post
    Hi

    i want to know that what is the guarantee that 1MMBTU can produced 293kW in case of Natural gas,
    and what is the guarantee that 1MMBTU energy contains 1.055 GJ of energy .

    thanks
    You are confusing power (watts) and energy (kilowatt-hours, joules, BTUs)

    How about a "near-guarantee?" The BTU has a variable definition in that it is the energy to heat 1 lb of water 1 F. However, the specific heat of water is variable, and there are at least five different definitions of the BTU in common use (same problem applies to the calorie), based on the initial and final temperature over which the measurement is made. When converted to joules (which are a uniform definition of energy), 1 MMBTU ranges from 1.05468 to 1.05967 MJ, depending on which BTU is in use. Rounded to 4 figures your number is correct, but reality could be very slightly lower, certainly greater than 1.054 GJ. The petroleum and natural gas industry uses the BTU defined at 60 F (US) or 15 C (most metric countries) which is near the lower number. Some countries require the BTU-IT, which is the figure you gave. If the minor difference is significant to you, you would have to look into what is legally specified in your country for the BTU (or the therm, which is 100 000 BTU) for metric conversion.

    Energy may also be measured in watt-hours (with a suitable prefix). It is used especially for electricity but may be used for any type of energy. Because there are 3600 s in 1 h, 1 Wh = 3600 J or 3.6 kJ. This is a representation of the same type of energy in alternate units. 1.055GJ of thermal energy converts to 293 kWh of thermal energy. As no engine/generator set has 100% thermal efficiency, I absolutely guarantee it will NOT generate 293 kWh of electrical energy. Slightly less than 100 kWh of electric energy would be typical (around 33% efficiency), but depends on your setup. "Most" thermal energy consumed by an engine is dissipated as waste heat.

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