Type 68 --- TOWERTL  
                                ===================

SIMULATION OF A COOLING TOWER WITH TWO AIR FLOW RATES

Routine TOWERTL deals with the part load operation of a cooling tower 
with two fan speeds, i.e. two different air flow rates (called "maximium"
and "minimium" rates). 

The purpose of routine TOWERTL is to determine to  cooling tower 
operating mode in order to reach a given set point temperature, i.e. a 
mean exhaust water temperature.
Again, the part load opertion is simulated by a linear interpolation 
between two steady-state regimes and the cyclic losses are not accounted 
for. 
A heat transfer coefficient must previously be identified for each air 
flow rate.
A non zero value of AUoff will correspond to the case where the fan is 
OFF but the water pump is still ON (free convection regime) while AUoff
is set equal to zero when both fan and water pump are shut down. 

Note: The Pos and corresponding theta values (already used in routine 
TOWEROO ) can be used in order to define the fan and pump electricity 
consumption.

Input, Output and Parameter descriptions are in the *.for file. For More 
details, see the HVAC1KIT manual.

For a complete  description of the routine, reference the HVAC1KIT manual, 
prepared by;
Jean Pascal BOURDOUXHE and Marc GRODENT, Research Assistants.
Jean LEBRUN, Principle Investigator.