Note - this case requires optional compounds
This example illustrates how Alph can be used to do a simple conversion reaction calculation, specifically the burning of methane in air to determine an adiabatic flame temperature. See the more detailed description.
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{
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"PropPkg" : "APRNGL",
"Tools" : [
{
"Type" : "Mixer",
"name" : "mixer",
"DiagramX" : 104.3643,
"DiagramY" : 155.0293,
"inputPaths" : [
"air",
"fuel"
]
},
{
"Tools" : [
{
"Source" : "mixed",
"name" : "feed",
"Description" : "parent reactant fluid",
"Notes" : "Should be connected to the fluid in the parent containing the reactants.",
"DiagramX" : 20.80527,
"Type" : "Model Input Tool",
"DiagramY" : 96.7365
}
],
"name" : "burner",
"Notes" : "This model performs a single stoichiometric reaction.\n\nSee the notes for #feed, $s, $basis and $extent for information on the required inputs.\n\nSee the notes for $product, $isoproduct and $q for information on the calculated values.",
"DiagramX" : 274.8101,
"Variables" : [
{
"PropertyFormula" : "#feed*#feed.f",
"name" : "r",
"Description" : "reactant flows",
"DiagramX" : 129.9649,
"Type" : "V",
"PropertyType" : "X",
"DiagramY" : 173.1295
},
{
"name" : "s",
"Description" : "stoichiometry",
"Notes" : "Assign the reaction stoichiometry to the compounds.\n\nminus for reactants\npositive for products\nzero for inerts\n\nFor example:\n\n2H2 + O2 => 2H2O\n\nwould have:\n\nH2 = -2\nO2 = -1\nH2O = 2\nN2 = 0\n",
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"PropertyFormula" : "[-1,1,0,-2,2]",
"Type" : "V",
"PropertyType" : "X",
"DiagramY" : 189.8138
},
{
"PropertyFormula" : "#feed.x:$basis * #feed.f * $extent / (-$s:$basis)",
"name" : "e",
"Description" : "methane consumption",
"DiagramX" : 133.5778,
"Type" : "V",
"PropertyType" : "F",
"DiagramY" : 254.7208
},
{
"name" : "basis",
"Description" : "compound extent is based on",
"Notes" : "Compound the reaction extent is based on.\n\nMust be a quoted name like \"methane\"",
"DiagramX" : 21.087,
"PropertyFormula" : "\"methane\"",
"Type" : "V",
"PropertyType" : "Vf",
"DiagramY" : 226.389
},
{
"name" : "extent",
"Description" : "fraction of basis compound consumed in the reaction",
"Notes" : "Fraction of basis compound consumed in the reaction",
"DiagramX" : 22.17861,
"PropertyFormula" : "0.95",
"Type" : "V",
"PropertyType" : "Vf",
"DiagramY" : 275.3838
},
{
"PropertyFormula" : "$r + $s * $e",
"name" : "p",
"Description" : "reaction products",
"DiagramX" : 210.7751,
"Type" : "V",
"PropertyType" : "X",
"DiagramY" : 224.0997
},
{
"name" : "q",
"Description" : "reactor q",
"Notes" : "Contains the total heat produced by the reaction. Note the use of the rxnbasis property to convert the enthalpies into ones that take into account heats of formation.",
"DiagramX" : 416.42,
"PropertyFormula" : "(#feed.h + #feed.rxnbasis) * #feed.f\n -\n(@iso.h + @iso.rxnbasis)\n* @iso.f\n\n",
"Type" : "V",
"PropertyType" : "Q",
"DiagramY" : 168.8822
},
{
"name" : "product",
"Description" : "adiabatic reaction product",
"Notes" : "Contains the products assuming the reaction is adiabatic.\n",
"DiagramX" : 415.4342,
"PropertyFormula" : "@prod",
"Type" : "V",
"PropertyType" : "Reference",
"DiagramY" : 100.061
},
{
"name" : "isoproduct",
"Description" : "isothermal reaction product",
"Notes" : "Contains the products assuming isothermal.",
"DiagramX" : 421.5417,
"PropertyFormula" : "@iso",
"Type" : "V",
"PropertyType" : "Reference",
"DiagramY" : 209.9726
}
],
"diagramX" : -8.232287,
"Type" : "Model Tool",
"Fluids" : [
{
"FlowFormula" : "{ sum $p }",
"SumCompForFlow" : false,
"DiagramX" : 249.1213,
"FirstPropType" : "T",
"SecondPropType" : "P",
"CompFormula" : "$p",
"FirstPropFormula" : "#feed",
"Retrograde" : false,
"TwoLiquids" : false,
"SecondPropFormula" : "#feed",
"name" : "iso",
"Description" : "isothermal reaction products",
"Type" : "F",
"DiagramY" : 171.5073
},
{
"FlowFormula" : "@iso",
"SumCompForFlow" : false,
"DiagramX" : 320.3455,
"FirstPropType" : "P",
"SecondPropType" : "H",
"CompFormula" : "@iso",
"FirstPropFormula" : "@iso",
"Retrograde" : false,
"TwoLiquids" : false,
"SecondPropFormula" : "( @iso.q + $q ) / @iso.f",
"name" : "prod",
"Description" : "adiabatic reaction product",
"Type" : "F",
"DiagramY" : 101.1295
}
],
"diagramScale" : 2.089317,
"DiagramY" : 154.2459,
"diagramY" : -69.9846
}
],
"diagramX" : -6.068729,
"SelectedToolIndex" : 1,
"Program" : "Alph",
"NextFluidNumber" : 1,
"Fluids" : [
{
"FlowFormula" : "400 kgmole/h",
"SumCompForFlow" : false,
"DiagramX" : 16.06873,
"Retrograde" : false,
"FirstPropType" : "T",
"CompFormula" : "[ 0,0,.79,.21,0 ]",
"SecondPropType" : "P",
"FirstPropFormula" : "20 C",
"TwoLiquids" : false,
"SecondPropFormula" : "100 kPa",
"name" : "air",
"Type" : "F",
"DiagramY" : 128.6773
},
{
"FlowFormula" : "30 kgmole/h",
"SumCompForFlow" : false,
"DiagramX" : 16.44849,
"FirstPropType" : "T",
"SecondPropType" : "P",
"CompFormula" : "[ 1,0,0,0,0 ]",
"FirstPropFormula" : "20 C",
"Retrograde" : false,
"TwoLiquids" : false,
"SecondPropFormula" : "100 kPa",
"name" : "fuel",
"Description" : "pure methane",
"Type" : "F",
"DiagramY" : 189.9702
},
{
"FlowFormula" : "#mixer",
"SumCompForFlow" : false,
"DiagramX" : 191.7962,
"FirstPropType" : "P",
"SecondPropType" : "H",
"CompFormula" : "#mixer",
"FirstPropFormula" : "#mixer",
"Retrograde" : false,
"TwoLiquids" : false,
"SecondPropFormula" : "#mixer",
"name" : "mixed",
"Description" : "air / fuel mixture",
"Type" : "F",
"DiagramY" : 154.5751
},
{
"FlowFormula" : "#burner.product",
"SumCompForFlow" : false,
"DiagramX" : 358.4761,
"Retrograde" : false,
"FirstPropType" : "T",
"CompFormula" : "#burner.product",
"SecondPropType" : "P",
"FirstPropFormula" : "#burner.product",
"TwoLiquids" : false,
"SecondPropFormula" : "#burner.product",
"name" : "product",
"Type" : "F",
"DiagramY" : 153.6326
}
],
"Hypotheticals" : [],
"diagramY" : -118.6773,
"CompoundNames" : [
"METHANE",
"CARBON DIOXIDE",
"NITROGEN",
"OXYGEN",
"WATER"
],
"SelectedVariableIndex" : 2147483647,
"Variables" : [],
"CaseName" : "combustion",
"CurrentUnitSet" : 1,
"NextVariableNumber" : 1,
"Version" : 1.4,
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"DisplayedProperties" : {
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"8" : "y",
"-2" : "y",
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"-6" : "y",
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