Heat Exchanger Performance Subprograms by S.Gabel and
M. J. Brandemuehl.  Revised for TRNSYS by N.Blair and
R.Schwarz.

      	This model was adapted strictly for use with the TRNSYS Program by
the Solar Energy Laboratory.

This subroutine calculates the output states of simple
heat exchanger using the effectiveness-Ntu method of
analysis.  There are six different heat exchanger con-
figurations adressed by the algorithm.

               1.  Counterflow
               2.  Parallel flow
               3.  Cross flow, both streams unmixed
               4.  Cross flow, both streams mixed
               5.  Cross flow, stream 1 unmixed
               6.  Cross flow, stream 2 unmixed


Developed at: University of Colorado at Boulder for the ASHRAE
May 25, 1992