Equivalent leakage area

Equivalent leakage area (ELA) The specified design pressure difference that allows a given air quantity to pass through a set orifice area. 

This jacket is considered a special case of a helical coil if certain factors are incorporated into equations for calculating outside-film coefficients. In the equations at left and below, the equivalent heat transfer diameter D. for a rectangular cross-section IS equal to four times the width of the annular space, w and IS the mean or centerline diameter of the coil helix. Velocities are calculated from the actual cross-section of the flow area. pw. where p IS the pitch of the spiral baffle, and from the effective mass flowrate. W. through the passage. The leakage around spiral baffles is considerable, amounting to 35-50% of the total mass flowrate. The effective mass flowrate is about 60% of the total mass flowrate to the jacket W =... 

Figure 6.12 Model electrical equivalent circuit to calculate the leakage current in an electrodialyzer. C cation exchange membrane A anion exchange membrane Re electrical resistance of effective membrane area (cell resistance) Rc electrical resistance of channels between compartment of effective membrane area and internal conduits of concentrated and desalting stream (leakage resistance) Rd electrical resistance of conduits in the inlet and outlet of concentrated and desalting stream in the electrodialyzer (channel resistance).

The results from the single channel model described in section 3.4.1 were used to define the angular distribution and spectrum of a lamina disk source placed at the bottom of the core support plate. The radius of this disk source was based on the equivalent area of all the fuel channels and the source strength was normalised to give the correct neutron leakage from the whole core. 

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