7. give the examples of higher heating values of natural gases from various sources?
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1-primary energy sources-Primary energy is the energy extracted or captured directly from the environment. Three distinctive groups of primary energy are:
• Nonrenewable energy (fossil fuels): coal, crude oil, natural gas, nuclear fuel.
• Renewable energy: hydropower, biomass, solar energy, wind, geothermal, and occean energy.
2-secondary energy sources-The primary energy is transformed to secondary energy in the form of electrical energy or fuel, such as gasoline, fuel oil, methanol, ethanol, and hydrogen. The primary energy of renewable energy sources, such as sun, wind, biomass, geothermal energy, and flowing water is usually equated with either electrical or thermal energy produced from them. Final energy is often electrical energy and fuel, which is referred to as useful energy. The selected four forms of final energy are electrical, thermal, mechanical, and chemical energy. These forms of final energy set a boundary between the energy production and the consumption sectors.
• Nonrenewable energy (fossil fuels): coal, crude oil, natural gas, nuclear fuel.
• Renewable energy: hydropower, biomass, solar energy, wind, geothermal, and occean energy.
2-secondary energy sources-The primary energy is transformed to secondary energy in the form of electrical energy or fuel, such as gasoline, fuel oil, methanol, ethanol, and hydrogen. The primary energy of renewable energy sources, such as sun, wind, biomass, geothermal energy, and flowing water is usually equated with either electrical or thermal energy produced from them. Final energy is often electrical energy and fuel, which is referred to as useful energy. The selected four forms of final energy are electrical, thermal, mechanical, and chemical energy. These forms of final energy set a boundary between the energy production and the consumption sectors.
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