public static CalcResult ElementCalc(string fluid, double l, double Aa_fin, double Aa_tube, double A_r_cs, double Ar, Geometry geo, double tai, double RHi, double tri, double pri, double hri, double mr, double g, double ma, double ha, double haw, double eta_surface, double zh, double zdp, int hexType, double thickness, double conductivity, AbstractState coolprop) { //AbstractState coolprop = AbstractState.factory("HEOS", fluid); double dh = geo.Di; double r_metal = thickness / conductivity / Ar; double gg = 9.8; double q_initial = 0.01; double q = q_initial; double err = 0.01; bool flag = false; int iter = 1; CalcResult res = new CalcResult(); //res.Tao[0] = new double(); double EnthalpyL, EnthalpyV; //recalc tri to make sure it is 2ph, ruhao, 20180225 coolprop.update(input_pairs.PQ_INPUTS, pri * 1000, 0); tri = coolprop.T() - 273.15; //tri = CoolProp.PropsSI("T", "P", pri * 1000, "Q", 0, fluid) - 273.15; coolprop.update(input_pairs.QT_INPUTS, 0, tri + 273.15); EnthalpyL = coolprop.hmass() / 1000; //EnthalpyL = CoolProp.PropsSI("H", "T", tri + 273.15, "Q", 0, fluid) / 1000; coolprop.update(input_pairs.QT_INPUTS, 1, tri + 273.15); EnthalpyV = coolprop.hmass() / 1000; //EnthalpyV = CoolProp.PropsSI("H", "T", tri + 273.15, "Q", 1, fluid) / 1000; res.x_i = (hri - EnthalpyL) / (EnthalpyV - EnthalpyL); RefHTCandDPResult htc_dp = new RefHTCandDPResult(); do { flag = false; htc_dp = RefrigerantHTCandDP.HTCandDP_2p(fluid, dh, g, pri, res.x_i, l, q, zh, zdp, hexType, coolprop); res.href = htc_dp.Href; res.DP = htc_dp.DPref; double cp_a = 1.0; //keep it for now as a constant cp_a = (hexType == 0 ? 1.027 : 1.02); double C_a = ma * cp_a; res.R_1a = 1 / ((eta_surface * Aa_fin + Aa_tube) * ha); res.R_1r = 1 / (res.href * Ar); res.R_1 = res.R_1a + res.R_1r + r_metal; double UA = 1 / res.R_1; double NTU = UA / (C_a * 1000); double epsilon = 1 - Math.Exp(-NTU); res.Q = epsilon * C_a * (tai - tri) * Math.Pow(-1, hexType);//Math.Abs(tai - tri) res.Tao = tai + Math.Pow(-1, (hexType + 1)) * res.Q / C_a; res.hro = hri + Math.Pow(-1, hexType) * res.Q / mr; //0:evap, 1:cond res.x_o = (res.hro - EnthalpyL) / (EnthalpyV - EnthalpyL); //+ 139.17 for reference state, to be changed //res.DP = 0; res.Pro = pri - res.DP; if (res.Pro < 0) { res.Pro = -10000000; return(res); } coolprop.update(input_pairs.HmassP_INPUTS, res.hro * 1000, res.Pro * 1000); res.Tro = coolprop.T(); //res.Tro = CoolProp.PropsSI("T", "P", res.Pro * 1000, "H", res.hro * 1000, fluid); double rho_o = coolprop.rhomass(); //double rho_o = CoolProp.PropsSI("D", "P", res.Pro * 1000, "H", res.hro * 1000, fluid); res.Tro = res.Tro - 273.15; res.Vel_r = g / rho_o; if (Math.Abs(q - res.Q) / res.Q > err) { q = res.Q; flag = true; } iter++; } while (flag && iter < 100); if (iter >= 100) { throw new Exception("iter for href > 100."); } return(res); }
public static CalcResult ElementCalc1(string fluid, double l, double Aa_fin, double Aa_tube, double A_r_cs, double Ar, Geometry geo, double tai, double RHi, double tri, double pri, double hri, double mr, double g, double ma, double ha, double haw, double eta_surface, double zh, double zdp, int hexType, double thickness, double conductivity, AbstractState coolprop, double[,] SourceTableData) { Model.HumidAirProp humidairprop = new Model.HumidAirProp(); RHi = RHi > 1 ? 1 : RHi; double dh = geo.Di; double r_metal = thickness / conductivity / Ar; double gg = 9.8; double q_initial = 0.01; double q = q_initial; bool flag = false; double err = 0.01; int iter = 1; CalcResult res = new CalcResult(); double EnthalpyL, EnthalpyV; coolprop.update(input_pairs.PQ_INPUTS, pri * 1000, 0); tri = coolprop.T() - 273.15; //tri = CoolProp.PropsSI("T", "P", pri * 1000, "Q", 0, fluid) - 273.15; coolprop.update(input_pairs.QT_INPUTS, 0, tri + 273.15); EnthalpyL = coolprop.hmass() / 1000; //EnthalpyL = CoolProp.PropsSI("H", "T", tri + 273.15, "Q", 0, fluid) / 1000; coolprop.update(input_pairs.QT_INPUTS, 1, tri + 273.15); EnthalpyV = coolprop.hmass() / 1000; //EnthalpyV = CoolProp.PropsSI("H", "T", tri + 273.15, "Q", 1, fluid) / 1000; res.x_i = (hri - EnthalpyL) / (EnthalpyV - EnthalpyL); RefHTCandDPResult htc_dp = new RefHTCandDPResult(); do { flag = false; htc_dp = RefrigerantHTCandDP.HTCandDP_2p(fluid, dh, g, pri, res.x_i, l, q, zh, zdp, hexType, coolprop); res.href = htc_dp.Href; res.DP = htc_dp.DPref; double k_fin = 237; double Fthickness = geo.Fthickness; double Pt = geo.Pt; double Pr = geo.Pr; double Do = geo.Do; double r_eta = Do / 2; double XD = Math.Pow((Pr * Pr + Pt * Pt / 4), 0.5) / 2; double XT = Pt / 2; double rf_r = 1.27 * XT / r_eta * Math.Pow((XD / XT - 0.3), 0.5); double m = Math.Pow((2 * ha / k_fin / Fthickness), 0.5); double fai = (rf_r - 1) * (1 + (0.3 + Math.Pow((m * r_eta * (rf_r - r_eta) / 2.5), (1.5 - 1 / 12 * rf_r)) * (0.26 * Math.Pow(rf_r, 0.3) - 0.3)) * Math.Log(rf_r)); double eta_0 = Math.Tanh(m * r_eta * fai) / m / r_eta / fai * Math.Cos(0.1 * m * r_eta * fai); double eta_a = (eta_0 * Aa_fin + Aa_tube) / (Aa_fin + Aa_tube); //// //double cp_a0 = CoolProp.HAPropsSI("C", "T", tai + 273.15, "P", 101325, "R", RHi); //double cp_a = 1005.1458551 + 0.1541627 * tai + 4.3454442 * RHi - 0.0090904 * Math.Pow(tai, 2) - 0.3409659 * Math.Pow(RHi, 2) - 0.0007819 * tai * RHi + 0.0001851 * Math.Pow(tai, 3) + 0.0049274 * Math.Pow(RHi, 3) + 0.0476513 * tai * Math.Pow(RHi, 2) + 0.020268209 * Math.Pow(tai, 2) * RHi; double cp_a = humidairprop.Cp(tai, RHi, SourceTableData); double UA = 1 / (1 / ha / (Aa_fin * eta_0 + Aa_tube) + 1 / (res.href * Ar) + r_metal); double Ntu_dry = UA / (ma * cp_a); double epsilon_dry = 1 - Math.Exp(-Ntu_dry); double Q_dry = epsilon_dry * ma * cp_a * (tai - tri) * Math.Pow(-1, hexType); double tao = tai - Q_dry / (ma * cp_a) * Math.Pow(-1, hexType); double hro = hri + Q_dry / 1000 / mr * Math.Pow(-1, hexType); double UA_o = ha * (Aa_fin * eta_0 + Aa_tube); double UA_i = res.href * Ar; double NTU_o = UA_o / (cp_a * ma); double T_so_a = (UA_o * tai + UA_i * tri) / (UA_o + UA_i); double T_so_b = (UA_o * tao + UA_i * tri) / (UA_o + UA_i); double Q = Q_dry; double Q_sensible = 0; //double omega_in0 = CoolProp.HAPropsSI("W", "T", tai + 273.15, "P", 101325, "R", RHi); //double omega_in = (-0.0682340 + 0.0292341 * tai + 4.1604535 * RHi - 0.0025985 * Math.Pow(tai, 2) - 0.0769009 * Math.Pow(RHi, 2) + 0.1246489 * tai * RHi + 6.008 * Math.Pow(10, -5) * Math.Pow(tai, 3) - 0.0006775 * Math.Pow(RHi, 3) + 0.0267183 * tai * Math.Pow(RHi, 2) + 0.019904969 * Math.Pow(tai, 2) * RHi) / 1000; double omega_in = humidairprop.O(tai, RHi, SourceTableData); //double hai0 = CoolProp.HAPropsSI("H", "T", tai + 273.15, "P", 101325, "R", RHi); //double hai = -244.2924077 + 1135.8711 * tai + 10101.404 * RHi - 12.968219 * Math.Pow(tai, 2) - 11.356807 * Math.Pow(RHi, 2) + 357.25464 * tai * RHi + 0.3178346 * Math.Pow(tai, 3) - 0.0024329 * Math.Pow(RHi, 3) + 44.100799 * tai * Math.Pow(RHi, 2) + 50.31444812 * Math.Pow(tai, 2) * RHi; double hai = humidairprop.H(tai, "R", RHi, SourceTableData); //double ha2 = ((1.006 + 1.805 * omega_in1) * tai + 2501 * omega_in1) * 1000;//采用湿空气 物性的关系来写 //double omega_out = omega_in; double hout_a = hai - Q / ma * Math.Pow(-1, hexType); ///// //***delete***// //res.RHout = CoolProp.HAPropsSI("R", "T", tao + 273.15, "P", 101325, "W", omega_out); //res.RHout = 0.0215344 - 0.0059467 * tao + 0.2386894 * (omega_out * 1000) + 0.0004378 * Math.Pow(tao, 2) + 0.0004635 * Math.Pow((omega_out * 1000), 2) - 0.0125912 * tao * (omega_out * 1000) - 9.134 * Math.Pow(10, -6) * Math.Pow(tao, 3) + 1.696 * Math.Pow(10, -6) * Math.Pow((omega_out * 1000), 3) - 2.214 * Math.Pow(10, -5) * tao * Math.Pow((omega_out * 1000), 2) + 0.000200865 * Math.Pow(tao, 2) * (omega_out * 1000); //***delete***// //double resRHout0 = CoolProp.HAPropsSI("R", "T", tao + 273.15, "P", 101325, "H", hout_a); //res.RHout = 0.0259124 - 0.0996818 * tao + 0.0934877 * (hout_a / 1000) + 0.0040018 * Math.Pow(tao, 2) - 0.0003662 * Math.Pow((hout_a / 1000), 2) - 0.0034077 * tao * (hout_a / 1000) - 1.76447 * Math.Pow(10, -5) * Math.Pow(tao, 3) - 2.74524 * Math.Pow(10, -6) * Math.Pow((hout_a / 1000), 3) + 2.99291 * Math.Pow(10, -5) * tao * Math.Pow((hout_a / 1000), 2) - 9.56644 * Math.Pow(10, -6) * Math.Pow(tao, 2) * (hout_a / 1000); double Tdp_out = humidairprop.Ts(hout_a, SourceTableData); res.RHout = humidairprop.RHI(tao, Tdp_out, SourceTableData); double f_dry = 0; if (hexType == 0 && tri < tai) { double hao = 0; //double Tdp0 = CoolProp.HAPropsSI("D", "T", tai + 273.15, "P", 101325, "R", RHi) - 273.15; //double Tdp = -273.15 + 241.0212518 + 0.5718833 * tai + 84.99553 * RHi + 0.002691 * Math.Pow(tai, 2) - 95.003186 * Math.Pow(RHi, 2) + 0.7135779 * tai * RHi - 2.691 / Math.Pow(10, 5) * Math.Pow(tai, 3) + 42.58183 * Math.Pow(RHi, 3) - 0.3227474 * tai * Math.Pow(RHi, 2) - 0.000884612 * Math.Pow(tai, 2) * RHi; double Tdp = humidairprop.Tdp(tai, RHi, SourceTableData); /* * double Ps = omega_in * 101325 / (0.622 + omega_in); * double Tdp1 = -39.957 - 1.8762 * Math.Log(Ps) + 1.1689 * Math.Pow(Math.Log(Ps), 2); * double Tdp3 = 8.22 + 12.4 * Math.Log(Ps) + 1.9 * Math.Pow(Math.Log(Ps), 2); * if (Tdp1 <= 0) * { * Tdp1 = -60.45 + 7.0322 * Math.Log(Ps) + 0.37 * Math.Pow(Math.Log(Ps), 2); * } */ if (T_so_b > Tdp) { f_dry = 1.0; Q = Q_dry; Q_sensible = Q; //omega_out = omega_in; } else { double T_ac = 0; double h_ac = 0; if (T_so_a < Tdp) { f_dry = 0.0; Q_dry = 0.0; T_ac = tai; h_ac = hai; } else { T_ac = Tdp + UA_i / UA_o * (Tdp - tri); epsilon_dry = (tai - T_ac) / (tai - tri); f_dry = -1.0 / Ntu_dry * Math.Log(1.0 - epsilon_dry); //double h_ac0 = CoolProp.HAPropsSI("H", "T", T_ac + 273.15, "P", 101325, "W", omega_in); //h_ac = -244.2924077 + 1135.8711 * T_ac + 10101.404 * RHi - 12.968219 * Math.Pow(T_ac, 2) - 11.356807 * Math.Pow(RHi, 2) + 357.25464 * T_ac * RHi + 0.3178346 * Math.Pow(T_ac, 3) - 0.0024329 * Math.Pow(RHi, 3) + 44.100799 * T_ac * Math.Pow(RHi, 2) + 50.31444812 * Math.Pow(T_ac, 2) * RHi; h_ac = humidairprop.H(T_ac, "Omega", omega_in, SourceTableData); Q_dry = ma * cp_a * (tai - T_ac); } //double h1 = 58.732687 * Math.Pow(tri + 273.15 + 0.01, 2) - 30921.970577 * (tri + 273.15 + 0.01) + 4075493.951473; double h1 = humidairprop.H(tri + 0.01, "R", 1, SourceTableData); //double h2 = 58.732687 * Math.Pow(tri + 273.15 - 0.01, 2) - 30921.970577 * (tri + 273.15 - 0.01) + 4075493.951473; double h2 = humidairprop.H(tri - 0.01, "R", 1, SourceTableData); double c_s = (h1 - h2) / 0.02; //double c_s0 = (CoolProp.HAPropsSI("H", "T", tri + 273.15 + 0.01, "P", 101325, "R", 1.0) - CoolProp.HAPropsSI("H", "T", tri + 273.15 - 0.01, "P", 101325, "R", 1.0)) / 0.02; m = Math.Pow((2 * haw / k_fin / Fthickness), 0.5); fai = (rf_r - 1) * (1 + (0.3 + Math.Pow((m * r_eta * (rf_r - r_eta) / 2.5), (1.5 - 1 / 12 * rf_r)) * (0.26 * Math.Pow(rf_r, 0.3) - 0.3)) * Math.Log(rf_r)); double eta_wet = Math.Tanh(m * r_eta * fai) / m / r_eta / fai * Math.Cos(0.1 * m * r_eta * fai); //eta_a = (eta_0 * Aa_fin + Aa_tube) / (Aa_fin + Aa_tube); UA_o = haw * (eta_wet * Aa_fin + Aa_tube); NTU_o = UA_o / (ma * cp_a); double UA_wet = 1 / (c_s / UA_i + cp_a / UA_o); double Ntu_wet = UA_wet / ma; double epsilon_wet = 1 - Math.Exp(-(1 - f_dry) * Ntu_wet); //double h_s_s_o0 = CoolProp.HAPropsSI("H", "T", tri + 273.15, "P", 101325, "R", 1.0); //double h_s_s_o = 58.732687 * Math.Pow(tri + 273.15, 2) - 30921.970577 * (tri + 273.15 - 0.01) + 4075493.951473; double h_s_s_o = humidairprop.H(tri, "R", 1, SourceTableData); double Q_wet = epsilon_wet * ma * (h_ac - h_s_s_o); Q = Q_wet + Q_dry; hao = h_ac - Q_wet / ma; double h_s_s_e = h_ac - (h_ac - hao) / (1 - Math.Exp(-(1 - f_dry) * NTU_o)); //double T_s_e0 = CoolProp.HAPropsSI("T","H",h_s_s_e,"P",101325,"R",1.0)-273.15; //double T_s_e = -273.15 - 1.96 * Math.Pow(10, -3) * Math.Pow(h_s_s_e / 1000, 2) + 0.5357597 * h_s_s_e / 1000 + 268.871551; double T_s_e = humidairprop.Ts(h_s_s_e, SourceTableData); tao = T_s_e + (T_ac - T_s_e) * Math.Exp(-(1 - f_dry) * NTU_o); Q_sensible = ma * cp_a * (tai - tao); hro = hri + Q / 1000 / mr; } hout_a = hai - Q / ma * Math.Pow(-1, hexType); //double resRHout00 = CoolProp.HAPropsSI("R", "T", tao + 273.15, "P", 101325, "H", hout_a); //res.RHout = 0.0259124 - 0.0996818 * tao + 0.0934877 * (hout_a / 1000) + 0.0040018 * Math.Pow(tao, 2) - 0.0003662 * Math.Pow((hout_a / 1000), 2) - 0.0034077 * tao * (hout_a / 1000) - 1.76447 * Math.Pow(10, -5) * Math.Pow(tao, 3) - 2.74524 * Math.Pow(10, -6) * Math.Pow((hout_a / 1000), 3) + 2.99291 * Math.Pow(10, -5) * tao * Math.Pow((hout_a / 1000), 2) - 9.56644 * Math.Pow(10, -6) * Math.Pow(tao, 2) * (hout_a / 1000); Tdp_out = humidairprop.Ts(hout_a, SourceTableData); res.RHout = humidairprop.RHI(tao, Tdp_out, SourceTableData); if (res.RHout > 1) { res.RHout = 1; //double tao0 = CoolProp.HAPropsSI("T", "H", hao, "P", 101325, "R", 1)-273.15; //tao = -273.15 - 1.96 * Math.Pow(10, -3) * Math.Pow(hao / 1000, 2) + 0.5357597 * hao / 1000 + 268.871551; tao = humidairprop.Ts(hao, SourceTableData); Q_sensible = ma * cp_a * (tai - tao); } } res.R_1a = 1 / ((eta_0 * Aa_fin + Aa_tube) * ha); res.R_1r = 1 / (res.href * Ar); res.R_1 = res.R_1a + res.R_1r + r_metal; res.Q = Q / 1000; res.Tao = tao; res.hro = hro; res.Pro = pri - res.DP; if (res.Pro < 0) { res.Pro = -10000000; return(res); } coolprop.update(input_pairs.HmassP_INPUTS, res.hro * 1000, res.Pro * 1000); res.Tro = coolprop.T() - 273.15; //res.Tro = CoolProp.PropsSI("T", "P", res.Pro * 1000, "H", res.hro * 1000, fluid); double rho_o = coolprop.rhomass(); //double rho_o = CoolProp.PropsSI("D", "P", res.Pro * 1000, "H", res.hro * 1000, fluid); res.Vel_r = g / rho_o; res.x_o = (res.hro - EnthalpyL) / (EnthalpyV - EnthalpyL); //+ 139.17 for reference state, to be changed if (Math.Abs(q - res.Q) / res.Q > err) { q = res.Q; flag = true; } iter++; } while (flag && iter < 20); //if (iter >= 20) //{ // throw new Exception("iter for href > 100."); //} return(res); }
public static CalcResult ElementCalc(string[] fluid, double[] composition, double dh, double l, double Aa_fin, double Aa_tube, double A_r_cs, double Ar, double tai, double tri, double pri, double hri, double mr, double g, double ma, double ha, double eta_surface, double zh, double zdp, int hexType, double thickness, double conductivity) { double r_metal = thickness / conductivity / Ar; double gg = 9.8; //double temperature; int phase1 = 1; int phase2 = 2; double q_initial = 0.01; double q = q_initial; double err = 0.01; bool flag = false; int iter = 1; CalcResult res = new CalcResult(); //res.Tao[0] = new double(); var r = new Refrigerant.SATTTotalResult(); //temperature = Refrigerant.SATP(fluid, composition, pri, phase1).Temperature; r = Refrigerant.SATTTotal(fluid, composition, tri + 273.15).SATTTotalResult; //temperature res.x_i = (hri - r.EnthalpyL) / (r.EnthalpyV - r.EnthalpyL); //+ 140 for reference state, to be changed RefHTCandDPResult htc_dp = new RefHTCandDPResult(); do { flag = false; htc_dp = RefrigerantHTCandDP.HTCandDP(fluid, composition, dh, g, pri, res.x_i, l, q, zh, zdp); res.href = htc_dp.Href; res.DP = htc_dp.DPref; double cp_a = 1.0; //keep it for now as a constant cp_a = (hexType == 0 ? 1.027 : 1.02); double C_a = ma * cp_a; res.R_1a = 1 / ((eta_surface * Aa_fin + Aa_tube) * ha); res.R_1r = 1 / (res.href * Ar); res.R_1 = res.R_1a + res.R_1r + r_metal; double UA = 1 / res.R_1; double NTU = UA / (C_a * 1000); double epsilon = 1 - Math.Exp(-NTU); res.Q = epsilon * C_a * Math.Abs(tai - tri); res.Tao = tai + Math.Pow(-1, (hexType + 1)) * res.Q / C_a; res.hro = hri + Math.Pow(-1, hexType) * res.Q / mr; //0:evap, 1:cond res.x_o = (res.hro - r.EnthalpyL) / (r.EnthalpyV - r.EnthalpyL); //+ 139.17 for reference state, to be changed //res.DP = 0; res.Pro = pri - res.DP; res.Tro = Refrigerant.PHFLSH(fluid, composition, res.Pro, (res.hro + (fluid[0] == "Water" ? 0 : 140)) * r.Wm).t; // double rho_o = Refrigerant.TQFLSH(fluid, composition, res.Tro, res.x_o).D *r.Wm; // .TPFLSH(fluid, composition, res.Tro, res.Pro).D * r.Wm;//wrong value //double rho_o = Refrigerant.PHFLSH(fluid, composition, res.Pro, (res.hro + 140) * r.Wm).D * r.Wm; //if (res.x_o > 1 || res.x_o < 0) // rho_o = Refrigerant.PHFLSH(fluid, composition, res.Pro, res.hro).D; ////rho_o=density(ref$, P=Pri, T=Tro) //else // rho_o = 0; // //rho_o=density(ref$, P=Pri, x=x_o) res.Tro = res.Tro - 273.15; res.Vel_r = g / rho_o; if (Math.Abs(q - res.Q) / res.Q > err) { q = res.Q; flag = true; } iter++; } while (flag && iter < 100); if (iter >= 100) { throw new Exception("iter for href > 100."); } return(res); }