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GASPAT
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GASPAT.TXT
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1992-05-11
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USER'S INFORMATION FOR FURNACE CALIBRATION PROGRAM GASPAT
APPROACH
Program GASPAT is a driver program to compute furnace performance using
the routines from the SP43 Simulation Model. The user can control the burner
on-time and time from burner-off to start of the next cycle. Alternatively,
the user can invoke a steady-state cyclic run followed by a cycle similar to
the AFUE cycle in length. The first 20-minute-on/20-minute-off cycle is
preceded by three similar preconditioning cycles to establish consistency in
the cyclic pattern by minimizing the effect of initial conditions.
Output from the first on-cycle provides steady-state values for
comparison to furnace calibration data such as flue-gas temperature, air-
temperature rise, and steady-state efficiency. Comparison of the transient
efficiency from the second "AFUE" cycle with steady-state efficiency from the
first cycle, provides an estimate of the difference in efficiency to be
expected between the two cycles. The residual energy from an energy balance is
provided for both cycles to assure the user of consistency in the input values
for fuel rate, excess air, and circulating-air flow rate.
Note: This driver program cannot, in its present form, calculate an AFUE
value for the furnace. It could calculate flue temperatures to use
in an AFUE calculation; however, it was not used for this purpose
in the SP43 program.
The output data from a run are on file TAPE60
INPUT PARAMETERS
Primary input parameters are described below followed by a description
of values that are of secondary importance in furnace calibration.
INPUT PARAMETERS FOR PROGRAM GASPAT (namelist /INPUT/ data in files
GASPATA.DAT)
Variable Typical
Name Description Value Units
TIMEON On-time duration 0** min
TIMEOF Off-time duration 0** min
TRETP Return-air temperature 68. F
WSPED Wind velocity (affects vent flow) 3. mph
TI Indoor temperature (affects vent heat loss) 68. F
TODDB Outdoor temperature 42. F
TATTC Attic Temperature (Affects vent heat loss ) 45. F
TAIN Furnace environment temperature (Affects jacket and
vent heat loss) 68. F
TWBI Combustion air wet-bulb temperature (affects moisture
in combustion air--little effect with non condensing
furnaces but should be set to give 50 percent relative
humidity with condensing furnaces 67. F
TCOMB Combustion air temperature 68. F
ICOND = 0 for noncondensing furnaces,
= 1 for condensing furnaces 0 --
NCYCLS No. of preconditioning cycles 3 --
IAFUE = 1 to follow up the first cycle
(after preconditioning) with a cycle similar to the AFUE
cycle in length 1 --
NSK1, NSK2, NSK3 No. of lines to skip within the furnace
file (see the GASPAT listing --allows the user to
access furnace parameters from the HOUSE_II furnace
input file FUR1AXXX.DAT) 3, 9, 5 --
** Zero on and off duration invokes cyclic operation of 20 min on and 20 min off followed by a cycle similar in length to the AFUE cycle.
SECONDARY INPUT PARAMETERS FOR PROGRAM GASPAT
(file GASPATA.DAT -- namelist /INPUT/)
Variable Typical
Name Description Value Units
TCYCON Obsolete parameter used to include a delay in onset of
increased flue flow due to combustion 0 --
ISKIP = 0 on first call to GASF to initialize many constant values 0 --
IDEBUG Debug print if not equal zero 0 --
TRAREF If >0, TAIN and TCOMB get set to this value within GASF 0 --
BARPSI Barometer 14.4 psia
TMSV, TJSV, TMACSV, TMPLSV, TMV are initial metal temperatures
(not much affect with three preconditioning cycles)
TMSV Heat exchanger sections 99.,125.,130. F
TJSV Jacket 76. F
TMACSV A-Coil 88. F
TMPLSV Plenum 78. F
TMV Vent 76.,76.,71.,64.,62. F
INDQ Indicators for summing the net heat exchange at metal of
the heat exchanger sections, jacket, A-coil, plenum, and vent 1,1,1,1,1 --
IQFILE Indicator for printing tables of time and the following
values. Heat flows: input, useful, sensible loss at vent,
and latent loss at vent. Heat transferred at: heat exchanger
metal, jacket metal, A-coil metal, plenum metal, and vent metal. 0 --
INPUT FOR NAMELIST/PAT1/ (appended to the data for namelist /INPUT/
in files GASPATA.DAT)
Input for NAMELIST/PAT1/ is read in the main program GASPAT. This
group of parameters can be used to match predicted and measured air
and gas temperatures during a heat up and cool down cycle for use in
adjusting dynamic furnace operation.
Variable Typical
Name Description Value Units
TMAFU(1) Time after burner ignition 0.3333 min
TFON1 Flue-gas temperature at TMAFU(1) 295. F
TMAFU(2) Time after burner ignition 1.3333 min
TFON2 Flue-gas temperature at TMAFU(2) 415. F
TMAFU(3) Time after burner ignition 16.6667 min
TFSS Flue-gas temperature at TMAFU(3) 468. F
DTRA2 Air temperature rise (including blower) 63.4 F
TMAFU(4) Time after burner off 1.3333 min
TFOFF3 Flue-gas temperature at TMAFU(4) 285. F
TMAFU(5) Time after burner off 9. min
TFOFF4 Flue-gas temperature at TMAFU(5) 128. F
TMAFU(6) Time after burner ignition 1.3333 min
DTRA4 Air temperature rise at TMAFU(6) 40. F
TFOFF5 Flue-gas temperature at time after burner off
of > 20 min. 105. F
DTRA3 Air temperature rise corresponding to TFOFF5 15. F
OUTPUT DATA
In this description of output data from program GASPAT, reference
is made to the output file for the example problem listed in File TAPE60A.
The first group of output data provide values for various parameters,
including the firing rate, QEXTT(1), in units of Btu/h. A table of values
for parameters predicted during the 20-minute heat-up cycle begins next.
Parameters in this table are described in the following sectin titled
"Key Output Parameters from Program GASPAT". Interspersed within this
table are output values from the plenum routine and values for the sensible
and latent heat loss in the vent. For furnace calibration, the important
steady state parameters occur at the end of the 20-minute on cycle.
These are:
TG2 Flue gas temperature, F (the 2nd column in the table)
DTA Air-side temperature rise--includes head input from blower,F (the
3rd column in the table)
EFFYSS Furnace efficiency based on stack losses, percent
STEADY-STATE EFFCY Steady-state efficiency based on airside output
less blower heat input and fuel input, percent.
Furnace efficiencies identified as "FOR TRANSIENT CYCLE" are based on
integrated values for the entire on/off cycle. The QNXXX values below the
transient cycle efficiencies are the net residual heat exchange (in BTU) at
metal in various furnace sections called for by the INDQ parameter. The values
should be close to zero for equality of heat into and out of the metal. Minor
errors do occur due to the finite-difference approach with 20-second- time step
and variable heat exchange coefficients with the blower on or off.
KEY OUTPUT PARAMETERS FROM PROGRAM GASPAT
Table Header
Variables Description Units
TG2 Flue gas temperature F
DTA Air temperature rise (including blower heat input) F
WGT Flue flow Lbm/hr
WD Diverter flow Lbm/hr
WV Vent flow Lbm/hr
TM(2) Metal temperature at second section of heat exchanger F
TVENTI Gas temperature at the vent inlet after mixing of dilution air F
TVH Gas temperature in the vent at the inlet to the attic section F
TAMX Air temperature leaving the heat exchanger F
TAJAC Air temperature leaving the heat exchanger corrected for jacket
loss F
TAAC Air temperature leaving the A-coil F
TAPL Air temperature leaving the plenum (at entry to the supply duct) F
BURN = 1 burner on; = 0, burner off
BLWR = 1 blower on; = 0, blower off
Interspersed Variables
Plenum
- - - -
DTRA same as DTA
TA2, TPL Air temperature entering and leaving plenum F
TMPL Plenum metal temperature F
QIPL Convective heat flow at inner walls of plenum Btu/hr
QPLEN Heat loss from plenum Btu/hr
QMPL Net heat exchange at plenum metal Btu/hr
Flue losses
- - - - - -
QVLOS Sensible heat loss in vent Btu/hr
QVLLOS Latent heat loss in vent Btu/hr