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 ElementCalc3(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, double Pwater, AbstractState coolprop, double[,] SourceTableData)
{
Model.HumidAirProp humidairprop = new Model.HumidAirProp();
RHi = RHi > 1 ? 1 : RHi;
double dh = geo.Di;
double Q = 0;
double Tout_a = 0;
double Q_sensible = 0;
double r_metal = thickness / conductivity / Ar;
CalcResult res = new CalcResult();
coolprop.update(input_pairs.HmassP_INPUTS, hri * 1000, (fluid == "Water" ? Pwater : pri) * 1000);
double mu_r = coolprop.viscosity();
//double mu_r = CoolProp.PropsSI("V", "H", hri * 1000, "P", (fluid == "Water" ? Pwater : pri) * 1000, fluid);
double k_r = coolprop.conductivity();
//double k_r = CoolProp.PropsSI("L", "H", hri * 1000, "P", (fluid == "Water" ? Pwater : pri) * 1000, fluid);
double rho_r = coolprop.rhomass();
//double rho_r = CoolProp.PropsSI("D", "H", hri * 1000, "P", (fluid == "Water" ? Pwater : pri) * 1000, fluid);
double cp_r = coolprop.cpmass();
//double cp_r = CoolProp.PropsSI("C", "H", hri * 1000, "P", (fluid == "Water" ? Pwater : pri) * 1000, fluid);
double Pr_r = cp_r * mu_r / k_r;
res.Vel_r = g / rho_r;
double Re_r = rho_r * res.Vel_r * dh / mu_r;
double fh = RefrigerantSPHTC.ff_CHURCHILL(Re_r);
double Nusselt = RefrigerantSPHTC.NU_GNIELINSKI(Re_r, Pr_r, fh);
res.href = Nusselt * k_r / dh * zh;
double cp_da = 1.0;
cp_da = (hexType == 0 ? 1.027 : 1.02) * 1000;
double Tin_a = tai;
double Tin_r = tri;
//double cp_da0 = CoolProp.HAPropsSI("C", "T", Tin_a + 273.15, "P", 101325, "R", RHi);
//cp_da = 1005.1458551 + 0.1541627 * Tin_a + 4.3454442 * RHi - 0.0090904 * Math.Pow(Tin_a, 2) - 0.3409659 * Math.Pow(RHi, 2) - 0.0007819 * Tin_a * RHi + 0.0001851 * Math.Pow(Tin_a, 3) + 0.0049274 * Math.Pow(RHi, 3) + 0.0476513 * Tin_a * Math.Pow(RHi, 2) + 0.020268209 * Math.Pow(Tin_a, 2) * RHi;
cp_da = humidairprop.Cp(Tin_a, RHi, SourceTableData);
double h_r = res.href;
double k_fin = 237;
double Fthickness = geo.Fthickness;
double Pt = geo.Pt;
double Pr = geo.Pr;
double Do = geo.Do;
//double h_fin = (Pt - Do) / 2;
//double dc = Do + 2 * Fthickness;
//double df = Math.Pow(4 / Math.PI * Pt * Pr, 0.5);
//double eta_a = 1 / (1 + ha * Math.Pow(df - dc, 2) * Math.Pow(df, 0.5) / 6 / Fthickness / k_fin / Math.Pow(dc, 0.5));
//double m = Math.Sqrt(2 * ha / (k_fin * Fthickness));
//double eta_a= Math.Tanh(m * h_fin) / (m * h_fin);// may cause error
//double eta_dry = eta_surface;
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 UA_i = h_r * Ar;
double UA_o = eta_a * (Aa_fin + Aa_tube) * ha;
double Ntu_i = UA_i / (mr * cp_r);
double Ntu_o = UA_o / (ma * cp_da);
double UA = 1 / (1 / (UA_i) + 1 / (UA_o) + r_metal);
double Cmin = Math.Min(cp_r * mr, cp_da * ma);
double Cmax = Math.Max(cp_r * mr, cp_da * ma);
double C_star = Cmin / Cmax;
double Ntu_dry = UA / Cmin;
double epsilon_dry = (1 - Math.Exp(-Ntu_dry * (1 - C_star))) / (1 - C_star * Math.Exp(-Ntu_dry * (1 - C_star)));
double Q_dry = epsilon_dry * Cmin * (Tin_a - Tin_r) * Math.Pow(-1, hexType);//need to be modified//所以蒸发器算不出Q
double Tout_a_dry = Tin_a - Q_dry / (ma * cp_da) * Math.Pow(-1, hexType);
double Tout_r = Tin_r + Q_dry / (mr * cp_r) * Math.Pow(-1, hexType);
double Tout_s = (UA_o * Tout_a_dry + UA_i * Tin_r) / (UA_o + UA_i);
double Tin_s = (UA_o * Tin_a + UA_i * Tout_r) / (UA_o + UA_i);
double Tout_r_dry = Tout_r;
double f_dry = 1.0;
//double omega_in0 = CoolProp.HAPropsSI("W", "T", Tin_a + 273.15, "P", 101325, "R", RHi);
//double omega_in = (-0.0682340 + 0.0292341 * Tin_a + 4.1604535 * RHi - 0.0025985 * Math.Pow(Tin_a, 2) - 0.0769009 * Math.Pow(RHi, 2) + 0.1246489 * Tin_a * RHi + 6.008 * Math.Pow(10, -5) * Math.Pow(Tin_a, 3) - 0.0006775 * Math.Pow(RHi, 3) + 0.0267183 * Tin_a * Math.Pow(RHi, 2) + 0.019904969 * Math.Pow(Tin_a, 2) * RHi) / 1000;
double omega_in = humidairprop.O(Tin_a, RHi, SourceTableData);
//double omega_out = omega_in;
double hin_a = 0;
if (hexType == 0 && tri < tai)
{
bool isFullyWet = true;
//double hin_a0 = CoolProp.HAPropsSI("H", "T", Tin_a + 273.15, "P", 101325, "R", RHi);
//hin_a = -244.2924077 + 1135.8711 * Tin_a + 10101.404 * RHi - 12.968219 * Math.Pow(Tin_a, 2) - 11.356807 * Math.Pow(RHi, 2) + 357.25464 * Tin_a * RHi + 0.3178346 * Math.Pow(Tin_a, 3) - 0.0024329 * Math.Pow(RHi, 3) + 44.100799 * Tin_a * Math.Pow(RHi, 2) + 50.31444812 * Math.Pow(Tin_a, 2) * RHi;
hin_a = humidairprop.H(Tin_a, "R", RHi, SourceTableData);
double hout_a = hin_a - Q_dry / ma * Math.Pow(-1, hexType);
//double Tdp0 = CoolProp.HAPropsSI("D", "T", Tin_a + 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(Tin_a, RHi, SourceTableData);
//***delete***//
//res.RHout = CoolProp.HAPropsSI("R", "T", Tout_a_dry + 273.15, "P", 101325, "W", omega_out);
//res.RHout = 0.0215344 - 0.0059467 * Tout_a_dry + 0.2386894 * (omega_out * 1000) + 0.0004378 * Math.Pow(Tout_a_dry, 2) + 0.0004635 * Math.Pow((omega_out * 1000), 2) - 0.0125912 * Tout_a_dry * (omega_out * 1000) - 9.134 * Math.Pow(10, -6) * Math.Pow(Tout_a_dry, 3) + 1.696 * Math.Pow(10, -6) * Math.Pow((omega_out * 1000), 3) - 2.214 * Math.Pow(10, -5) * Tout_a_dry * Math.Pow((omega_out * 1000), 2) + 0.000200865 * Math.Pow(Tout_a_dry, 2) * (omega_out * 1000);
//***delete***//
//res.RHout = CoolProp.HAPropsSI("R", "T", Tout_a_dry + 273.15, "P", 101325, "H", hout_a);
//double resRHout0 = CoolProp.HAPropsSI("R", "T", Tout_a_dry + 273.15, "P", 101325, "H", hout_a);
//res.RHout = 0.0259124 - 0.0996818 * Tout_a_dry + 0.0934877 * (hout_a / 1000) + 0.0040018 * Math.Pow(Tout_a_dry, 2) - 0.0003662 * Math.Pow((hout_a / 1000), 2) - 0.0034077 * Tout_a_dry * (hout_a / 1000) - 1.76447 * Math.Pow(10, -5) * Math.Pow(Tout_a_dry, 3) - 2.74524 * Math.Pow(10, -6) * Math.Pow((hout_a / 1000), 3) + 2.99291 * Math.Pow(10, -5) * Tout_a_dry * Math.Pow((hout_a / 1000), 2) - 9.56644 * Math.Pow(10, -6) * Math.Pow(Tout_a_dry, 2) * (hout_a / 1000);
//double Tdp_out0 = CoolProp.HAPropsSI("T", "H", hout_a, "P", 101325, "R", 1.0) - 273.15;//@@@@@@@@@@@@@@@@@@@@@@@@@@
double Tdp_out = humidairprop.Ts(hout_a / 1000, SourceTableData);
res.RHout = humidairprop.RHI(Tout_a_dry, Tdp_out, SourceTableData);
Tout_a = Tout_a_dry;
Q = Q_dry;
if (Tin_s < Tdp)
{
isFullyWet = true;
}
else
{
isFullyWet = false;
}
if (Tout_s < Tdp | isFullyWet == true)
{
double x1 = Tin_r + 0.001;
double x2 = Tin_a - 0.001;
double eps = 1e-8;
int iter = 1;
double change = 999;
double y1 = 0, y2 = 0, x3 = 0;
double m_star = 0, epsilon_wet = 0, h_s_w_i = 0, h_s_w_o = 0, h_s_s_e = 0, T_s_e = 0, h_a_x = 0, T_a_x = 0;
double Q_wet = 0, Ntu_owet = 0, mdot_min = 0;
double Ntu_wet = 0;
while ((iter <= 3 | change > eps) && iter < 100)
{
if (iter == 1)
{
Tout_r = x1;
}
if (iter > 1)
{
Tout_r = x2;
}
double Tout_r_start = Tout_r;
//double h_s_w_i0 = CoolProp.HAPropsSI("H", "T", Tin_r + 273.15, "P", 101325, "R", 1.0);
//h_s_w_i = 58.732687 * Math.Pow(Tin_r + 273.15, 2) - 30921.970577 * (Tin_r + 273.15) + 4075493.951473;
h_s_w_i = humidairprop.H(Tin_r, "R", 1, SourceTableData);
///////
//double h10 = 58.732687 * Math.Pow((Tin_r + Tout_r) / 2 + 273.15 + 0.01, 2) - 30921.970577 * ((Tin_r + Tout_r) / 2 + 273.15 + 0.01) + 4075493.951473;
double h1 = humidairprop.H((Tin_r + Tout_r) / 2 + 0.01, "R", 1, SourceTableData);
//double h20 = 58.732687 * Math.Pow((Tin_r + Tout_r) / 2 + 273.15, 2) - 30921.970577 * ((Tin_r + Tout_r) / 2 + 273.15 ) + 4075493.951473;
double h2 = humidairprop.H((Tin_r + Tout_r) / 2, "R", 1, SourceTableData);
double c_s = (h1 - h2) / 0.01;
//double c_s = (CoolProp.HAPropsSI("H", "T", (Tin_r + Tout_r) / 2 + 273.15 + 0.01, "P", 101325, "R", 1) - CoolProp.HAPropsSI("H", "T", (Tin_r + Tout_r) / 2 + 273.15, "P", 101325, "R", 1)) / 0.01;
//double c_s = 2500;
//m = Math.Sqrt(2 * ha*c_s/cp_da / (k_fin * Fthickness));
//eta_a= Math.Tanh(m * h_fin) / (m * h_fin);// may cause error
//double m_star=ma/(mr*(cp_r/c_s));
//eta_a = eta_a * c_s / cp_da;
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));
eta_0 = Math.Tanh(m * r_eta * fai) / m / r_eta / fai * Math.Cos(0.1 * m * r_eta * fai);
double eta_wet = (eta_0 * Aa_fin + Aa_tube) / (Aa_fin + Aa_tube);
Ntu_owet = (eta_0 * Aa_fin + Aa_tube) * haw / (ma * cp_da);//zzc
m_star = Math.Min(cp_r * mr / c_s, ma) / Math.Max(cp_r * mr / c_s, ma);
mdot_min = Math.Min(cp_r * mr / c_s, ma);
Ntu_wet = Ntu_owet / (1 + m_star * (Ntu_owet / Ntu_i));//zzc
if (cp_r * mr > c_s * ma)
{
Ntu_wet = Ntu_owet / (1 + m_star * (Ntu_owet / Ntu_i));//zzc
}
else
{
Ntu_wet = Ntu_i / (1 + m_star * (Ntu_i / Ntu_owet));
}
epsilon_wet = ((1 - Math.Exp(-Ntu_wet * (1 - m_star))) / (1 - m_star * Math.Exp(-Ntu_wet * (1 - m_star))));
Q_wet = epsilon_wet * mdot_min * (hin_a - h_s_w_i);
hout_a = hin_a - Q_wet / ma;
Tout_r = Tin_r + ma / (mr * cp_r) * (hin_a - hout_a);
//double h_s_w_o0 = CoolProp.HAPropsSI("H", "T", Tout_r + 273.15, "P", 101325, "R", 1.0);
//h_s_w_o = 58.732687 * Math.Pow(Tout_r + 273.15, 2) - 30921.970577 * (Tout_r + 273.15) + 4075493.951473;
h_s_w_o = humidairprop.H(Tout_r, "R", 1, SourceTableData);
//double UA_star = 1 / (cp_da / (eta_a * Aa_fin + Aa_tube) / haw + CoolProp.HAPropsSI("C", "T", (Tin_a + Tout_r) / 2.0 + 273.15, "P", 101325, "R", 1) / h_r / Ar);//zzc
double UA_star = 1 / (cp_da / (eta_a * Aa_fin + Aa_tube) / haw + c_s / h_r / Ar); //zzc
Tin_s = Tout_r + UA_star / h_r / Ar * (hin_a - h_s_w_o);
h_s_s_e = hin_a + (hout_a - hin_a) / (1 - Math.Exp(-Ntu_owet)); //zzc
//double T_s_e0 = CoolProp.HAPropsSI("T", "H", h_s_s_e, "P", 101325, "R", 1.0) - 273.15;
//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;
T_s_e = humidairprop.Ts(h_s_s_e, SourceTableData);
Tout_a = T_s_e + (Tin_a - T_s_e) * Math.Exp(-Ntu_owet);//zzc
Q_sensible = ma * cp_da * (Tin_a - Tout_a);
double errorToutr = Tout_r - Tout_r_start;
if (iter == 1)
{
y1 = errorToutr;
}
if (iter > 1)
{
y2 = errorToutr;
x3 = x2 - y2 / (y2 - y1) * (x2 - x1);
change = Math.Abs(y2 / (y2 - y1) * (x2 - x1));
y1 = y2;
x1 = x2;
x2 = x3;
}
iter++;
}
//if (iter > 500)
// Q = Q_dry;
double Tout_r_wet = Tout_r;
f_dry = 0.0;
if ((Tin_s > Tdp) && isFullyWet == false)
{
double iter1 = 1;
double error = 1;
double Tout_r_guess = 0;
x1 = 0.0001;
x2 = 0.9999;
eps = 1e-8;
while ((iter1 <= 3 | change > eps) && iter < 100)
{
if (iter1 == 1)
{
f_dry = x1;
}
if (iter1 > 1)
{
f_dry = x2;
}
double K = Ntu_dry * (1.0 - C_star);
double expk = Math.Exp(-K * f_dry);
if (cp_da * ma < cp_r * mr)
{
Tout_r_guess = (Tdp + C_star * (Tin_a - Tdp) - expk * (1 - K / Ntu_o) * Tin_a) / (1 - expk * (1 - K / Ntu_o));//zzc
}
else
{
Tout_r_guess = (expk * (Tin_a + (C_star - 1) * Tdp) - C_star * (1 + K / Ntu_o) * Tin_a) / (expk * C_star - C_star * (1 + K / Ntu_o));//zzc
}
epsilon_dry = ((1 - Math.Exp(-f_dry * Ntu_dry * (1 - C_star))) / (1 - C_star * Math.Exp(-f_dry * Ntu_dry * (1 - C_star))));
epsilon_wet = ((1 - Math.Exp(-(1 - f_dry) * Ntu_wet * (1 - m_star))) / (1 - m_star * Math.Exp(-(1 - f_dry) * Ntu_wet * (1 - m_star))));
double T_w_x = (Tin_r + (mdot_min) / (cp_r * mr) * epsilon_wet * (hin_a - h_s_w_i - epsilon_dry * Cmin / ma * Tin_a)) / (1 - (Cmin * mdot_min) / (cp_r * mr * ma) * epsilon_wet * epsilon_dry);
T_a_x = Tin_a - epsilon_dry * Cmin * (Tin_a - T_w_x) / (ma * cp_da);
h_a_x = hin_a - cp_da * (Tin_a - T_a_x);
Tout_r = (Cmin) / (cp_r * mr) * epsilon_dry * Tin_a + (1 - (Cmin) / (cp_r * mr) * epsilon_dry) * T_w_x;
error = Tout_r - Tout_r_guess;
if (iter1 > 500)
{
Q = Q_dry;
}
if (iter1 == 1)
{
y1 = error;
}
if (iter1 > 1)
{
y2 = error;
x3 = x2 - y2 / (y2 - y1) * (x2 - x1);
change = Math.Abs(y2 / (y2 - y1) * (x2 - x1));
y1 = y2;
x1 = x2;
x2 = x3;
}
iter1++;
}
//if (iter1 > 500)
// Q = Q_dry;
Q = mr * cp_r * (Tout_r - Tin_r);
hout_a = hin_a - Q / ma;
h_s_s_e = h_a_x + (hout_a - h_a_x) / (1 - Math.Exp(-(1 - f_dry) * Ntu_owet));//zzc
//double T_s_e0 = CoolProp.HAPropsSI("T", "H", h_s_s_e, "P", 101325, "R", 1.0) - 273.15;////////////////
//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;
T_s_e = humidairprop.Ts(h_s_s_e, SourceTableData);
Tout_a = T_s_e + (T_a_x - T_s_e) * Math.Exp(-(1 - f_dry) * Ntu_owet);//zzc
Q_sensible = ma * cp_da * (Tin_a - Tout_a);
}
else
{
Q = Q_wet;
}
//res.RHout = CoolProp.HAPropsSI("R", "T", Tout_a + 273.15, "P", 101325, "H", hout_a);
//double resRHout1 = CoolProp.HAPropsSI("R", "T", Tout_a + 273.15, "P", 101325, "H", hout_a);
//res.RHout = 0.0259124 - 0.0996818 * Tout_a + 0.0934877 * (hout_a / 1000) + 0.0040018 * Math.Pow(Tout_a, 2) - 0.0003662 * Math.Pow((hout_a / 1000), 2) - 0.0034077 * Tout_a * (hout_a / 1000) - 1.76447 * Math.Pow(10, -5) * Math.Pow(Tout_a, 3) - 2.74524 * Math.Pow(10, -6) * Math.Pow((hout_a / 1000), 3) + 2.99291 * Math.Pow(10, -5) * Tout_a * Math.Pow((hout_a / 1000), 2) - 9.56644 * Math.Pow(10, -6) * Math.Pow(Tout_a, 2) * (hout_a / 1000);
Tdp_out = humidairprop.Ts(hout_a, SourceTableData);
res.RHout = humidairprop.RHI(Tout_a, Tdp_out, SourceTableData);
if (res.RHout > 1)
{
//res.RHout = 1;
//double Tout_a0 = CoolProp.HAPropsSI("T", "H", hout_a, "P", 101325, "R", 1)-273.15;
//Tout_a = -273.15 - 1.96 * Math.Pow(10, -3) * Math.Pow(hout_a / 1000, 2) + 0.5357597 * hout_a / 1000 + 268.871551;
//Tdp_out0 = CoolProp.HAPropsSI("T", "H", hout_a, "P", 101325, "R", 1.0) - 273.15;//@@@
Tout_a = humidairprop.Ts(hout_a, SourceTableData);
Q_sensible = ma * cp_da * (Tin_a - Tout_a);
}
}
}
else
{
Tout_a = Tout_a_dry;
Q = Q_dry;
Q_sensible = Q_dry;
double hout_a = hin_a - Q / ma * Math.Pow(-1, hexType);
//***delete***//
//res.RHout = CoolProp.HAPropsSI("R", "T", Tout_a + 273.15, "P", 101325, "W", omega_out);
//res.RHout = 0.0215344 - 0.0059467 * Tout_a + 0.2386894 * (omega_out * 1000) + 0.0004378 * Math.Pow(Tout_a, 2) + 0.0004635 * Math.Pow((omega_out * 1000), 2) - 0.0125912 * Tout_a * (omega_out * 1000) - 9.134 * Math.Pow(10, -6) * Math.Pow(Tout_a, 3) + 1.696 * Math.Pow(10, -6) * Math.Pow((omega_out * 1000), 3) - 2.214 * Math.Pow(10, -5) * Tout_a * Math.Pow((omega_out * 1000), 2) + 0.000200865 * Math.Pow(Tout_a, 2) * (omega_out * 1000);
//***delete***//
//res.RHout = CoolProp.HAPropsSI("R", "T", Tout_a + 273.15, "P", 101325, "H", hout_a);
//double resRHout0 = CoolProp.HAPropsSI("R", "T", Tout_a + 273.15, "P", 101325, "H", hout_a);
//res.RHout = 0.0259124 - 0.0996818 * Tout_a + 0.0934877 * (hout_a / 1000) + 0.0040018 * Math.Pow(Tout_a, 2) - 0.0003662 * Math.Pow((hout_a / 1000), 2) - 0.0034077 * Tout_a * (hout_a / 1000) - 1.76447 * Math.Pow(10, -5) * Math.Pow(Tout_a, 3) - 2.74524 * Math.Pow(10, -6) * Math.Pow((hout_a / 1000), 3) + 2.99291 * Math.Pow(10, -5) * Tout_a * Math.Pow((hout_a / 1000), 2) - 9.56644 * Math.Pow(10, -6) * Math.Pow(Tout_a, 2) * (hout_a / 1000);
//double Tdp_out0 = CoolProp.HAPropsSI("T", "H", hout_a, "P", 101325, "R", 1.0) - 273.15;//@@@
double Tdp_out = humidairprop.Ts(hout_a, SourceTableData);
res.RHout = humidairprop.RHI(Tout_a, Tdp_out, SourceTableData);
}
res.Tao = Tout_a;
res.Tro = Tout_r;
res.Q = Q / 1000;
//res.hro = (hri + Math.Pow(-1, hexType) * res.Q / mr);
double f_sp = RefrigerantSPDP.ff_Friction(Re_r);
res.DP = zdp * f_sp * l / dh * Math.Pow(g, 2.0) / rho_r / 2000;
res.Pro = fluid == "Water" ? pri : pri - res.DP;
if (res.Pro < 0)
{
res.Pro = -10000000; return(res);
}
res.hro = hri + Math.Pow(-1, hexType) * res.Q / mr;
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;
if (fluid != "Water")
{
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) - 273.15;
}
return(res);
}
