.AixLib.DataBase.CHP.ModularCHPEngineData.CHPEngDataBaseRecord

Information

Overview

Data base record for CHP power units. The nominal / rated operation point most likely corresponds to the given full load performance.

Requirements

These quantities must be known for reliable simulation (by value, variable relation etc.):

- Heat and Power: Q_MaxHea, etaCHP(Hi)

- Engine Geometry: hStr, dCyl, z, i

- Generator specification: p or n0, n_nominal, U_1, P_elNominal, f_1

- Lambda or xO2Exh: Required for calculation of the engine combustion, heat flow and the exhaust gas composition (Lambda = 0.21 / (0.21 - xO2Exh))

- nEngNominal

- dInn (typical values around 0.005m, important for heat transfer from engine to cooling)

Default values and variable relations

These are the default values or relations in case that there is no information available:

- nEngMax: Engine speed at full load (=nEngNominal)

- etaGen: Generator efficiency (default=0.92)

- I_elNominal (=P_elNominal/(sqrt(3)*U_1*cosPhi))

- P_mecNominal (=P_elNominal/etaGen)

- P_FueNominal (=(P_elNominal+Q_MaxHea)/etaCHP)

- VEng (default=0.25*hStr*Modelica.Constants.pi*dCyl^2*z)

- mEng (default=70389*VEng+17.913, for first appraisal of the heat capacities of engine housing, should be calibrated)

- eps (typical values around 12 (SI) and 21 (DI))

- T_ExhPowOut (default=373.15K)

- gearRatio (default=1)

- cosPhi (default=0.8)

- useGenHeat (default=false)

- Exhaust and Coolant: dExh(default=0.06m), dCoo(default=0.04m), dp_Coo(default=0.15bar), m_flowCooNominal(default=0.00003*Q_MaxHea-0.2043)

- Engine material: lambda, rhoEngWall, c (default is cast iron(most common))

Contents

Name	Description
RotationSpeed
AirRatio