Converting the Fisher Universal Gas Sizing Equation to SI units

6 Converting the Fisher Universal Gas Sizing Equation to Si units 

To convert the equation pair (A3.17) and (A3.18) into SI units, we begin by converting back from scf/h to cubic feet per hour using the inverse of equation (A3.13), namely  

Dividing by the specific volume in ft /lb gives the mass flow in Ib/h  

The term 0 in equation (A3.18) is dimensionless, and so it has not been necessary to change it in the conversion process. It may, however, be rearranged in terms of the SI conductance ratio, C = Cg/C , which has the advantage over C that it is dimensionless. CI may be related to C through equations (A3.25) and (A3.4)  

Since C depends on specific-heat ratio, y, but C does not, it follows that Cj and hence C are dependent on y in the same way as C and Cg. Substituting from equation (A3.26) into equation (A3.18) gives an alternative formula for 0  

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See also in sourсe #XX -- [ ]

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