Dulong’s equations

Calculate the net heating value (NHV) of methane, chloroform, benzene(g), chlorobenzene, and hydrogen sulfide. This assumes that the water product is in the vapor state. Compare these values with those calculated using Dulong s equation. Calculate the relative percent difference between the true NHVs as determined by thermodynamic calculations and the estimated values calculated using Dulong s equation. Dulong s equation can be written as follows ... 

The following results from Dulong s equation can be summarized as ... 

Based on these calculations, the difference between the thermodynamically based NHV values and those estimated using Dulong s equation can be summarized as ... 

In this table, a basis of 1000 Ib/h total waste flow of the four compounds was used. The NHV can be calculated for this four-compound mixture using Dulong s equation ... 

The relationship between the high and low heating values of a fuel having the empirical chemical formula is given by Dulong s equations. Note that the negative sign indi-... 

Dulong block To calculate performance- and capacity-related parameters, the lower heating value (LHV) is assessed according to Dulong s equation using the ultimate analysis, including the fuel moisture (as-received basis). 

Because the solution of Eq. (63) is not analytically feasible when k is not an integer, the case discussed here is k = 514, the Dulong and Petit s heat transfer law. So one can take the reasonable approximations only for the exponents in Equation (63),... 

This relation, commonly known as Einstein s (1905) law of heat capacities, correctly corresponds to the limiting cases Cy = Oat T = 0 and to Cy = 3R at infinite temperature—the law of Dulong and Petit. It immediately rationalizes the deviations of the observed Cy values from this law at lower temperatures that had mystified scientists before the advent of quantum mechanics. However, the above equation generally deviates to some extent from experiment in particular, at low T, the above relation shows that Cy, while experiments conform to aCy T variation. 

---