What is the energy efficiency of natural gas?

Answer 1

Energy efficiency is found by dividing the useful energy by the total energy consumed.

For instance, in an older gas furnace, you might burn the equivalent of 100,000 btu's but if only 70,000 go into the heated space, then the efficiency of the unit is 70%.

So, the efficiency will vary in how you use it and the equipment you use it in. Most new models of gas furnaces in the US are required, I believe, to be at or above 90%.

Answer 2

The amount of energy that is obtained from the burning of a volume of natural gas is measured in British thermal units (Btu). The value of natural gas is calculated by its Btu content. One Btu is the quantity of heat required to raise the temperature of one pound of water of 1 degree Fahrenheit at atmospheric pressure. A cubic foot of natural gas on the average gives off 1,000 Btu, but the range of values is between 500 and 1,500 Btu.

Energy content of natural gas is variable and depends on its accumulations which are influenced by the amount and types of energy gases they contain: the more non-combustible gases in a natural gas, the lower the Btu value. In addition, the volumic mass of energy gases which are present in a natural gas accumulation also influences the Btu value of natural gas. The more carbon atoms in a hydrocarbon gas, the higher its Btu value.

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Answer 3

What do you mean ??

Do you mean the calorific value in kJ/m³ ???