Detailed Hot Water 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 describes the operation a finned hot water heating coil 
for the purpose of heating an air stream.  The extended surface can be comprised
of either individual circular fins or continous plate fins.  The algorithm used
to calculate sensible heat transfer performance assumes single pass water flow
in a crossflow heat exchanger configuration.  The model is appropriate for coils
with one or two rows.  The heat transfer characteristics of the coil, such as
fin efficiencies and convection heat transfer coefficient, are determined from
detailed information about the coil geometry.  The algorithm calculates thermal 
resistances between the liquid and air streams from detailed geometric 
characteristics of the heat exchanger.  Components of thermal resistance, 
including convection heat transfer coefficients, are calculated in seperate heat
transfer utility routines.  While the Toolkit includes a particular set of heat
transfer correlations, users are welcome to substitute alternative correlations
as desired.  Sample input and output 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