Huffs method for vapour pressure systems

Huffs method11,21 (given in A5.2.2 below) is derived by noting that differential material. and energy balances give a simple expression for relief rate at the point where the temperature stops rising and begins to fall  

No simplifying assumptions are involved to this point in the derivation. Simplifying assumptions are involved to obtain the mass, m, at the point when the temperature begins to fall. The required relief flow rate can then be calculated on the basis that, at the maximum temperature, the heat released by the reaction is balanced by the heat removed by pressure relief. The method makes use of adiabatic experimental data, which can be obtained as described in Annex 2. 

There are two versions of Huffs method. The original and more rigorous method is described in reference 1 It requires iteration to find a solution and, therefore, takes longer to evaluate than the simplified method given below[2) for little increase in accuracy 

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