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and 102 kPa) (42,065) (41,581) (35,918)

(38,079)

(36,290)

Btu/lb(kJ/kg)

23,170

22,904

22,077

21,824

20,160

of fuel (53,893) (53,275) (51,351)

(50,763)

(46,892)

Table 5-4 Selected Samples of Natural Gas from U.S. Fields. Source: Babcock & Wilcox

Table 5-4 Selected Samples of Natural Gas from U.S. Fields. Source: Babcock & Wilcox

However, when the Btu is defined as the amount of energy required to raise the temperature of one lbm of pure water from 59°F to 60°F, it has a value of 1054.804 Joules (J). This particular Btu value is somewhat smaller than the International Table Btu (1 BtuIT = 1,055.056 J), which is slowly becoming the standard Btu for all applications. It should be noted, however, that only when Btu59 is used, the legally defined therm is equivalent to 100,000 Btu. In many less rigorous applications, the therm is taken to represent the energy content of 100 cf (1 Ccf) of natural gas; similarly, the energy content of 1,000 cf (1 Mcf) is equated to 1 million

Btu computed on an HHV basis, or 1 decatherm.

The heat content of natural gas production has remained fairly constant over the past few decades. The heat content of production (dry) has ranged from 1,026 to 1,032 Btu/cf and the heat content of production marketed (wet) has ranged from 1,098 to 1,115 Btu/cf (both as reported by the DoE EIA). Note that the heat content of production marketed (wet) is calculated annually by adding the heat content of dry natural gas production and the total heat content of natural gas plant liquids production and dividing this sum by the total quantity of marketed (wet) natural gas production.

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