An integral mass balance formulation of the constant concentration tracer technique.

This paper extends the integral mass balance approach to the remaining constant concentration technique. An integral formulation of the constant concentration problem is presented that accounts for the possibility of variation of tracer concentration. This approach leads, in principle, to data reduction strategies that may be expected to improve the accuracy of the constant concentration technique and that may be used to isolate those portions of a given constant concentration data set that are likely to be most reliable. The method is applied to the reduction of constant concentration data sets measured at the National Swedish Institute for Building Research and the results of this application are reviewed.