/// <summary>
/// Calculates VS_COD degradation rate and return its normalized
/// value as VS_COD_fitness
/// </summary>
/// <param name="mySensors"></param>
/// <param name="VS_COD_degradationRate"></param>
/// <returns>VS_COD_fitness: normalized between 0 and 1</returns>
private static double getVS_COD_fitness(biogas.sensors mySensors,
out double VS_COD_degradationRate)
{
// Volatile Solids COD degradation
// volatile COD in the final storage tank
// TODO stimmt so nicht, masseabgang durch biogas
// da der FLuss welcher in das Endlager rein geht immer identisch mit
// dem Fluss der Eingangssubstrate ist, kürzen sich die beiden werte
// immer raus, also hier nicht benötigt
physValue Q_final_storage = mySensors.getCurrentMeasurement("Q_finalstorage_2");
// gCOD/l
physValue VS_COD_final_storage = mySensors.getCurrentMeasurement("VS_COD_finalstorage_2");
// gCOD/l * m^3 == also eine Menge, keine Konzentration
double VS_COD_amount_final = VS_COD_final_storage.Value * Q_final_storage.Value;
// volatile COD in the substrate feed
// TODO
// measure Q_total_mix_2
physValue Q_total_mix = mySensors.getCurrentMeasurement("Q_total_mix_2");
// gCOD/l
physValue VS_COD_substrate = mySensors.getCurrentMeasurement("VS_COD_total_mix_2");
// gCOD/l * m^3 == also eine Menge, keine Konzentration
double VS_COD_amount_total = VS_COD_substrate.Value * Q_total_mix.Value;
//
// a value between 0 and 100
VS_COD_degradationRate =
(1 - Math.Max(VS_COD_amount_final, 0) / Math.Max(VS_COD_amount_total, double.Epsilon)) * 100;
//
double VS_COD_degradationMin = 0;
double VS_COD_degradationMax = 100;
// values between 0 and 1
double VS_COD_fitness = Math.Abs((1 - math.normalize(VS_COD_degradationRate,
VS_COD_degradationMin, VS_COD_degradationMax)));
return(VS_COD_fitness);
}
/// <summary>
/// Calculates the thermal energy balance of the digester. It compares
/// thermal sinks (negative) with thermal sources (positive) inside the digester
///
/// At the moment the following processes are reflected:
///
/// thermal sinks are:
///
/// 1) heat energy needed to heat the substrates up to the digesters temperature
/// (heat substrates)
/// 2) heat energy loss due to radiation through the surface of the fermenter
/// (radiation)
///
/// thermal sources are:
///
/// 1) microbiology
/// 2) stirrer dissipation
///
/// For further effects see
///
/// 1) Lübken, M., Wichern, M., Schlattmann, M., Gronauer, A., and Horn, H.:
/// Modelling the energy balance of an anaerobic digester fed with cattle manure
/// and renewable energy crops, Water Research 41, pp. 4085-4096, 2007
/// 2) Lindorfer, H., Kirchmayr, R., Braun, R.:
/// Self-heating of anaerobic digesters using energy crops, 2005
///
///
/// </summary>
/// <param name="Q">substrate feed measured in m^3/d</param>
/// <param name="mySubstrates"></param>
/// <param name="T_ambient">ambient temperature</param>
/// <param name="mySensors"></param>
/// <param name="Psubsheat">thermal energy needed to heat substrates in kWh/d</param>
/// <param name="Pradloss">thermal energy loss due to radiation in kWh/d</param>
/// <param name="Pmicros">Wärme produziert durch Bakterien in kWh/d</param>
/// <param name="Pstirdiss">thermal energy created by stirrer in kWh/d</param>
/// <returns>thermal energy balance mesasured in kWh/d</returns>
/// <exception cref="exception">Q.Length < mySubstrates.Count</exception>
/// <exception cref="exception">energy calculations failed</exception>
public double calcThermalEnergyBalance(double[] Q, substrates mySubstrates,
physValue T_ambient, sensors mySensors, out physValue Psubsheat, out physValue Pradloss,
out physValue Pmicros, out physValue Pstirdiss)
{
//physValue Pel_kWh_d;
//physValue Pel_kW;
// thermal energy needed to heat substrates in kWh/d
try
{
Psubsheat = mySubstrates.calcSumQuantityOfHeatPerDay(Q, T).convertUnit("kWh/d");
}
catch (exception e)
{
Console.WriteLine(e.Message);
throw new exception("calcThermalEnergyBalance: heat substrates failed!");
}
//physValue P_radiation_loss_kW;
//physValue P_radiation_loss_kWh_d;
// energy needed to compensate loss due to radiation
//compensateHeatLossDueToRadiation(T_ambient, out P_radiation_loss_kW, out P_radiation_loss_kWh_d);
// thermal energy loss due to radiation in kWh/d
try
{
Pradloss = calcHeatLossDueToRadiation(T_ambient).convertUnit("kWh/d");
}
catch (exception e)
{
Console.WriteLine(e.Message);
throw new exception("calcThermalEnergyBalance: heat loss calculation failed!");
}
// Wärme produziert durch Bakterien
// in kWh/d
try
{
Pmicros = mySensors.getCurrentMeasurement("energyProdMicro_" + id);
// wenn noch nichts aufgezeichnet wurde, dann ist der Wert 0
if (Pmicros.Value != 0)
{
Pmicros = Pmicros.convertUnit("kWh/d");
}
else // setzte zu 0 kWh/d, da einheit sonst nicht stimmt
{
Pmicros = new physValue(0, "kWh/d");
}
}
catch (exception e)
{
Console.WriteLine(e.Message);
throw new exception("calcThermalEnergyBalance: microorganisms failed!");
}
// Wärme welche das Rühwerk erzeugt ist eine Wärmequelle, muss hier addiert werden
// In Ganzheitliche stoffliche und energetische Modellierung S. 65
// Dissipation Rührwerk - ist identisch mit der aufgebrachten Leistung des
// rührwerks. dafür muss erstmal rührwerksleistung berechnet werden, s. ebenfalls
// In Ganzheitliche stoffliche und energetische Modellierung S. 45 ff.
// für rührwerksleitung muss auch viskosität berechnet werden s. S. 81 für verschiedene
// TS im fermenter
// thermal energy created by stirrer in kWh/d
try
{
Pstirdiss = calcStirrerDissipation(mySensors).convertUnit("kWh/d");
}
catch (exception e)
{
Console.WriteLine(e.Message);
throw new exception("calcThermalEnergyBalance: stirrer dissipation failed!");
}
// sinks are negative, themal sources are positive
physValue balance = -Psubsheat - Pradloss +
Pstirdiss + Pmicros; // + produzierteWärme im Fermenter
return(balance.Value);
}
