Simple Heating Coil
by S. Gabel and M. 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 outlet liquid temperature, air dry bulb 
temperature and humidity ratio, and the heating capacity for an air-to-liquid 
heat exchanger.  The steady state air and liquid conditions can be determined 
by using standard heat exchanger effectiveness relationships.  A crossflow 
effectiveness model with both fluids unmixed is used where the capacity rates
are calculated from inlet conditions and an overall heat transfer coefficient
for the coil.  The heat transfer coefficient is determined from coil rating 
data and is assumed to be constant.  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