Four computer programs written in FORTRAN and BASIC develop theoretical predictions and data reduction for a junior-senior level heat exchanger experiment. Programs may be used at the terminal in the laboratory to check progress of the experiment or may be used in the batch mode for interpretation of final information for a formal report. Several extensions treat the implementation of new theoretical and practical considerations into the program codes, illustrating both direct and adjunct use of the computer. Experimental results are checked with theoretical predictions to illustrate the use of the programs. (Author/GA)