Chapter 5e - Function set simple - a Simple simulation of a specific Stirling engine configuration
From the flow
diagram below we see that the main program
sea
(stirling engine
analysis) first defines the system to be simulated in terms of the
set of global variables set up by the
define
set of functions, as
described previously. It then invokes either the function
adiabatic
which does an Ideal
Adiabatic simulation, or the function
simple
to do a Simple
simulation to evaluate the heat transfer and pressure drop loss
effects. Function set 'simple' includes nine functions, all contained
in separate m-files as shown. The four main functions are
hotsim
and
kolsim
to respectively
evaluate the heater and cooler gas temperatures,
regsim
to evaluate the
regenerator effectiveness and resulting enthalpy loss, and
worksim
to evaluate the
pumping loss. The
heat-transfer/flow-friction
function set
includes function
reynum
to evaluate the
instantaneous Reynolds Number, and the three functions
pipefr
,
foilfr
and
matrixfr
to determine the
various flow friction and heat transfer coefficients.
The
dynamics of the solution algorithm lies in function
simple
,
as shown in the
following flow diagram. Thus the function set
define
specifies the
operating conditions, including the temperature bounds
th
and
tk
.
Since the temperature bounds of the working gas affect both the power
output and efficiency, the simple routine invokes
adiab
,
regsim
,
hotsim
,
and
kolsim
in a loop until
convergence of the gas temperatures is attained.
The nine
functions of the set
simple
are included in the
following m-files (refer to the flow diagram above): [
simple.m
,
hotsim.m
,
kolsim.m
,
regsim.m
,
reynum.m
,
worksim.m
,
pipefr.m
,
foilfr.m
and
matrixfr.m
].
As before, these can be directly copied from this website and used in
a system which has MATLAB installed.
Notice
that there are a limited number of heat exchanger configurations
specified. It is intended that the user will modify and augment this
system as required for specific systems, and as more updated heat
transfer correlation data becomes available.
Stirling Cycle Machine Analysis by Israel
Urieli
is licensed under a Creative
Commons Attribution-Noncommercial-Share Alike 3.0 United States
License