Cooling Coil with Completely Wet Surface
By S. Gabel and M. Brandemuehl for ASHRAE
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 outlet water temperature, air dry bulb
temperature and humidity ratio, and the total and sensible cooling capacity for
a coil with a completely wet fin surface.  The coil is considered to be 
operating under "all wet" surface conditions if the surface temperature at the 
air inlet is lower than the inlet air dewpoint temperature.  Under wet 
conditions, the steady state air and water conditions can be determined using
standard heat exchanger effectiveness relationships based on enthalpies rather 
than temperatures.  A counterflow effectiveness model for enthalpy exchange is 
used which closely approximates the performance of multi-row counter-crossflow
heat exchanger.  The resistances to enthalpy transfer are computed in terms of
conventional heat transfer coefficients, fin efficiencies, and "fictitious 
enthalpy" parameters.  Sample input and output values are included in the source
code.

REF: A Toolkit for Secondary HVAC System Energy Calculations  May 25, 1992
     Joint Center for Energy Management  University of Colorado at Boulder