Type 97 --- BOILERCT
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NUMERICAL SIMULAITON OF A BOILER SUBMITTED TO A CERTAIN HEAT DEMAND
Most modern boilers are equipped with combustion control systems that
satisfy heat demands. Three types of combustion control systems are
considered in this Toolkit1; ON-OFF, low-high-low-OFF and modulating
control systems. Boilers with a single burner levels make use of the
ON-OFF control system that simply starts and stops the fuel burner in
order to satisfy the heat demand; a low-high-low-OFF ("low" applies
to the minimium firing rate and "high" to the maximium one) control
system is used for burners with two burner levels. These two control
systems are referred to as "cyclic" operating modes because the burner
is passsing from one firing rate to another. This regimes are described
by reference as a "quasi-static" model : it is assumed that the cyclic
operation can be represented by a simple linear combination of two
steady state regimes. In the case of a burner with two boiler levels,
a gas-water heat transfer coefficient associated with the lower level
is assumed to be the same as for the higher level.
Ther exists a third combustion control system for boilers equipped
with a modulating burner. The boiler regulates the fuel mass flow rate
by means of a modulating burner in order to reach the given set point
temperature. Thereofre within the range of the modulating operation, the
boiler operates continuously with the same fuel flow rate. Once again,
the water-environment heat transfer coefficient is assumed to remain
constant whatever the regime may be.
The aim of routine BOILERCT is to determine the boiler operating mode
in order to reach a given set point temperature. Once again, the water
envorinment heat transfer coefficient is assumed to remain constant
whatever the regime may be.
The aim of routine BOILERCT is to determine the boiler operating mode in
order to reach a given set point temperature (i.e. a mean exhaust
temperature).
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.