/
sco2_pc_csp_int.cpp
5284 lines (4412 loc) · 218 KB
/
sco2_pc_csp_int.cpp
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/*
BSD 3-Clause License
Copyright (c) Alliance for Sustainable Energy, LLC. See also https://github.com/NREL/ssc/blob/develop/LICENSE
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "sco2_pc_csp_int.h"
//#include "sco2_pc_core.h"
#include "sco2_recompression_cycle.h"
#include "sco2_partialcooling_cycle.h"
#include "sco2_htrbypass_cycle.h"
#include "sco2_turbinesplitflow_cycle.h"
#include "csp_solver_util.h"
#include "CO2_properties.h"
#include <cmath>
#include <string>
#include "nlopt.hpp"
#include "fmin.h"
C_sco2_phx_air_cooler::C_sco2_phx_air_cooler()
{
// Get CO2 critical temperature
CO2_info co2_fluid_info;
get_CO2_info(&co2_fluid_info);
m_T_co2_crit = co2_fluid_info.T_critical; //[K]
m_P_co2_crit = co2_fluid_info.P_critical; //[kPa]
// Defaul critical temperature limit
m_is_T_crit_limit = true;
mf_callback_update = 0; // NULL
mp_mf_update = 0; // NULL
}
int C_sco2_phx_air_cooler::design(S_des_par des_par)
{
ms_des_par = des_par;
return design_core();
}
void C_sco2_phx_air_cooler::C_P_LP_in_iter_tracker::reset_vectors()
{
mv_P_LP_in.resize(0);
mv_W_dot_net.resize(0);
mv_P_mc_out.resize(0);
mv_od_error_code.resize(0);
mv_is_converged.resize(0);
}
void C_sco2_phx_air_cooler::C_P_LP_in_iter_tracker::push_back_vectors(double P_LP_in /*kpa*/, double W_dot_net /*kWe*/, double P_mc_out /*kPa*/,
int od_error_code, bool is_converged)
{
mv_P_LP_in.push_back(P_LP_in); //[kPa]
mv_W_dot_net.push_back(W_dot_net); //[kWe]
mv_P_mc_out.push_back(P_mc_out); //[kPa]
mv_od_error_code.push_back(od_error_code); //[-]
mv_is_converged.push_back(is_converged); //[-]
}
int C_sco2_phx_air_cooler::design_core()
{
// using -> C_RecompCycle::S_auto_opt_design_hit_eta_parameters
std::string error_msg;
int auto_err_code = 0;
std::string s_cycle_config = "";
// *************************************
// 4.25.22 Generator inputs - need to thread to cmod
int tgm_code = 0;
C_sco2_cycle_core::E_turbo_gen_motor_config turbo_gen_motor_config = static_cast<C_sco2_cycle_core::E_turbo_gen_motor_config>(tgm_code);
double eta_generator = 1.0;
// *************************************
double T_mc_in = ms_des_par.m_T_amb_des + ms_des_par.m_dt_mc_approach; //[K]
double T_t_in = ms_des_par.m_T_htf_hot_in - ms_des_par.m_phx_dt_hot_approach; //[K]
if (ms_des_par.m_cycle_config == 2)
{
std::unique_ptr<C_PartialCooling_Cycle> c_pc_cycle = std::unique_ptr<C_PartialCooling_Cycle>(new C_PartialCooling_Cycle(
turbo_gen_motor_config,
eta_generator,
T_mc_in,
ms_des_par.m_W_dot_net,
T_t_in, ms_des_par.m_P_high_limit,
ms_des_par.m_DP_LT, ms_des_par.m_DP_HT,
ms_des_par.m_DP_PC, ms_des_par.m_DP_PHX,
ms_des_par.m_LTR_N_sub_hxrs, ms_des_par.m_HTR_N_sub_hxrs,
ms_des_par.m_eta_mc, ms_des_par.m_mc_comp_type,
ms_des_par.m_eta_rc,
ms_des_par.m_eta_t, ms_des_par.m_N_turbine,
ms_des_par.m_frac_fan_power, ms_des_par.m_eta_fan, ms_des_par.m_deltaP_cooler_frac,
ms_des_par.m_N_nodes_pass,
ms_des_par.m_T_amb_des, ms_des_par.m_elevation));
s_cycle_config = "partial cooling";
mpc_sco2_cycle = std::move(c_pc_cycle);
}
else if(ms_des_par.m_cycle_config == 3)
{
std::unique_ptr<C_HTRBypass_Cycle> c_bp_cycle = std::unique_ptr<C_HTRBypass_Cycle>(new C_HTRBypass_Cycle(
turbo_gen_motor_config,
eta_generator,
T_mc_in,
ms_des_par.m_W_dot_net,
T_t_in, ms_des_par.m_P_high_limit,
ms_des_par.m_DP_LT, ms_des_par.m_DP_HT,
ms_des_par.m_DP_PC, ms_des_par.m_DP_PHX,
ms_des_par.m_LTR_N_sub_hxrs, ms_des_par.m_HTR_N_sub_hxrs,
ms_des_par.m_eta_mc, ms_des_par.m_mc_comp_type,
ms_des_par.m_eta_rc,
ms_des_par.m_eta_t, ms_des_par.m_N_turbine,
ms_des_par.m_frac_fan_power, ms_des_par.m_eta_fan, ms_des_par.m_deltaP_cooler_frac,
ms_des_par.m_N_nodes_pass,
ms_des_par.m_T_amb_des, ms_des_par.m_elevation));
s_cycle_config = "htr bypass";
// Get and Set HTF Parameters
{
int htf_code = ms_des_par.m_hot_fl_code;
util::matrix_t<double> htf_user_props = ms_des_par.mc_hot_fl_props;
HTFProperties htf_props;
if (htf_code != HTFProperties::User_defined && htf_code < HTFProperties::End_Library_Fluids)
{
if (!htf_props.SetFluid(htf_code, true))
{
throw(C_csp_exception("Hot fluid code is not recognized", "C_HX_co2_to_htf::initialization"));
}
}
else if (htf_code == HTFProperties::User_defined)
{
int n_rows = (int)htf_user_props.nrows();
int n_cols = (int)htf_user_props.ncols();
if (n_rows > 2 && n_cols == 7)
{
if (!htf_props.SetUserDefinedFluid(htf_user_props, true))
{
std::string error_msg = util::format(htf_props.UserFluidErrMessage(), n_rows, n_cols);
throw(C_csp_exception(error_msg, "C_HX_co2_to_htf::initialization"));
}
}
else
{
std::string error_msg = util::format("The user defined hot fluid table must contain at least 3 rows and exactly 7 columns. The current table contains %d row(s) and %d column(s)", n_rows, n_cols);
throw(C_csp_exception(error_msg, "C_HX_co2_to_htf::initialization"));
}
}
else
{
throw(C_csp_exception("Hot fluid code is not recognized", "C_HX_co2_to_htf::initialization"));
}
double HTF_PHX_inlet = ms_des_par.m_T_htf_hot_in;
double cp_htf = htf_props.Cp(HTF_PHX_inlet);
double T_target = ms_des_par.m_T_bypass_target;
double T_target_is_htf = ms_des_par.m_T_target_is_HTF;
double deltaT_bp = ms_des_par.m_deltaT_bypass;
double HTF_PHX_cold_approach = ms_des_par.m_phx_dt_cold_approach;
double set_HTF_mdot = ms_des_par.m_set_HTF_mdot;
c_bp_cycle->set_bp_par(HTF_PHX_inlet, T_target, cp_htf, deltaT_bp, HTF_PHX_cold_approach, set_HTF_mdot, T_target_is_htf);
}
mpc_sco2_cycle = std::move(c_bp_cycle);
}
else if (ms_des_par.m_cycle_config == 4)
{
std::unique_ptr<C_TurbineSplitFlow_Cycle> c_tsf_cycle = std::unique_ptr<C_TurbineSplitFlow_Cycle>(new C_TurbineSplitFlow_Cycle(
turbo_gen_motor_config,
eta_generator,
T_mc_in,
ms_des_par.m_W_dot_net,
T_t_in, ms_des_par.m_P_high_limit,
ms_des_par.m_DP_LT, ms_des_par.m_DP_HT,
ms_des_par.m_DP_PC, ms_des_par.m_DP_PHX,
ms_des_par.m_LTR_N_sub_hxrs, ms_des_par.m_HTR_N_sub_hxrs,
ms_des_par.m_eta_mc, ms_des_par.m_mc_comp_type,
ms_des_par.m_eta_rc,
ms_des_par.m_eta_t, ms_des_par.m_eta_t2,
ms_des_par.m_N_turbine,
ms_des_par.m_frac_fan_power, ms_des_par.m_eta_fan, ms_des_par.m_deltaP_cooler_frac,
ms_des_par.m_N_nodes_pass,
ms_des_par.m_T_amb_des, ms_des_par.m_elevation));
s_cycle_config = "turbine split flow";
mpc_sco2_cycle = std::move(c_tsf_cycle);
}
else
{
std::unique_ptr<C_RecompCycle> c_rc_cycle = std::unique_ptr<C_RecompCycle>(new C_RecompCycle(
turbo_gen_motor_config,
eta_generator,
T_mc_in,
ms_des_par.m_W_dot_net,
T_t_in, ms_des_par.m_P_high_limit,
ms_des_par.m_DP_LT, ms_des_par.m_DP_HT,
ms_des_par.m_DP_PC, ms_des_par.m_DP_PHX,
ms_des_par.m_LTR_N_sub_hxrs, ms_des_par.m_HTR_N_sub_hxrs,
ms_des_par.m_eta_mc, ms_des_par.m_mc_comp_type,
ms_des_par.m_eta_rc,
ms_des_par.m_eta_t, ms_des_par.m_N_turbine,
ms_des_par.m_frac_fan_power, ms_des_par.m_eta_fan, ms_des_par.m_deltaP_cooler_frac,
ms_des_par.m_N_nodes_pass,
ms_des_par.m_T_amb_des, ms_des_par.m_elevation));
s_cycle_config = "recompression";
mpc_sco2_cycle = std::move(c_rc_cycle);
}
// Set min temp
m_T_mc_in_min = mpc_sco2_cycle->get_design_limits().m_T_mc_in_min; //[K]
if (ms_des_par.m_design_method == 1)
{
// Design the cycle to hit a specified efficiency
// Define sCO2 cycle design parameter structure
ms_cycle_des_par.m_eta_thermal = ms_des_par.m_eta_thermal; //[-]
if (T_mc_in < m_T_mc_in_min)
{
std::string msg = util::format("The input design main compressor inlet temperature is %lg [C]."
" The sCO2 cycle design code reset it to the minimum allowable design main compressor inlet temperature: %lg [C].",
T_mc_in - 273.15,
m_T_mc_in_min - 273.15);
}
ms_cycle_des_par.m_T_pc_in = T_mc_in; //[K]
ms_cycle_des_par.m_DP_PC_pre = ms_des_par.m_DP_PC;
// LTR thermal design
ms_cycle_des_par.m_LTR_target_code = ms_des_par.m_LTR_target_code; //[-]
ms_cycle_des_par.m_LTR_UA = ms_des_par.m_LTR_UA; //[kW/K]
ms_cycle_des_par.m_LTR_min_dT = ms_des_par.m_LTR_min_dT; //[K]
ms_cycle_des_par.m_LTR_eff_target = ms_des_par.m_LTR_eff_target; //[-]
ms_cycle_des_par.m_LTR_eff_max = ms_des_par.m_LTR_eff_max; //[-]
ms_cycle_des_par.m_LTR_od_UA_target_type = ms_des_par.m_LTR_od_UA_target_type;
// HTR thermal design
ms_cycle_des_par.m_HTR_target_code = ms_des_par.m_HTR_target_code; //[-]
ms_cycle_des_par.m_HTR_UA = ms_des_par.m_HTR_UA; //[kW/K]
ms_cycle_des_par.m_HTR_min_dT = ms_des_par.m_HTR_min_dT; //[K]
ms_cycle_des_par.m_HTR_eff_target = ms_des_par.m_HTR_eff_target; //[-]
ms_cycle_des_par.m_HTR_eff_max = ms_des_par.m_HTR_eff_max; //[-]
ms_cycle_des_par.m_HTR_od_UA_target_type = ms_des_par.m_HTR_od_UA_target_type;
//
ms_cycle_des_par.m_eta_pc = ms_des_par.m_eta_pc;
ms_cycle_des_par.m_des_tol = ms_des_par.m_des_tol;
ms_cycle_des_par.m_des_opt_tol = ms_des_par.m_des_opt_tol;
ms_cycle_des_par.m_is_recomp_ok = ms_des_par.m_is_recomp_ok;
ms_cycle_des_par.m_is_bypass_ok = ms_des_par.m_is_bypass_ok;
ms_cycle_des_par.m_is_des_air_cooler = ms_des_par.m_is_des_air_cooler; //[-]
ms_cycle_des_par.m_des_objective_type = ms_des_par.m_des_objective_type; //[-]
ms_cycle_des_par.m_min_phx_deltaT = ms_des_par.m_min_phx_deltaT; //[C]
ms_cycle_des_par.m_fixed_P_mc_out = ms_des_par.m_fixed_P_mc_out; //[-]
ms_cycle_des_par.m_PR_HP_to_LP_guess = ms_des_par.m_PR_HP_to_LP_guess; //[-]
ms_cycle_des_par.m_fixed_PR_HP_to_LP = ms_des_par.m_fixed_PR_HP_to_LP; //[-]
ms_cycle_des_par.m_f_PR_HP_to_IP_guess = ms_des_par.m_f_PR_HP_to_IP_guess; //[-]
ms_cycle_des_par.m_fixed_f_PR_HP_to_IP = ms_des_par.m_fixed_f_PR_HP_to_IP; //[-]
ms_cycle_des_par.mf_callback_log = mf_callback_update;
ms_cycle_des_par.mp_mf_active = mp_mf_update;
auto_err_code = mpc_sco2_cycle->auto_opt_design_hit_eta(ms_cycle_des_par, error_msg);
}
else if (ms_des_par.m_design_method == 2 || ms_des_par.m_design_method == 3)
{
if (ms_des_par.m_design_method == 2)
{
if (ms_des_par.m_UA_recup_tot_des < 0.0)
{
std::string ex_msg = "The " + s_cycle_config + " cycle and CSP integration design, design method 2, conductance must be > 0";
throw(C_csp_exception(ex_msg.c_str()));
}
}
C_sco2_cycle_core::S_auto_opt_design_parameters des_params;
if (T_mc_in < m_T_mc_in_min)
{
std::string msg = util::format("The input design main compressor inlet temperature is %lg [C]."
" The sCO2 cycle design code reset it to the minimum allowable design main compressor inlet temperature: %lg [C].",
T_mc_in - 273.15,
m_T_mc_in_min - 273.15);
}
des_params.m_T_pc_in = T_mc_in; //[K]
des_params.m_DP_PC_pre = ms_des_par.m_DP_PC;
des_params.m_UA_rec_total = ms_des_par.m_UA_recup_tot_des; //[kW/K]
// LTR thermal design
des_params.m_LTR_target_code = ms_des_par.m_LTR_target_code; //[-]
des_params.m_LTR_UA = ms_des_par.m_LTR_UA; //[kW/K]
des_params.m_LTR_min_dT = ms_des_par.m_LTR_min_dT; //[K]
des_params.m_LTR_eff_target = ms_des_par.m_LTR_eff_target; //[-]
des_params.m_LTR_eff_max = ms_des_par.m_LTR_eff_max; //[-]
des_params.m_LTR_od_UA_target_type = ms_des_par.m_LTR_od_UA_target_type;
// HTR thermal design
des_params.m_HTR_target_code = ms_des_par.m_HTR_target_code; //[-]
des_params.m_HTR_UA = ms_des_par.m_HTR_UA; //[kW/K]
des_params.m_HTR_min_dT = ms_des_par.m_HTR_min_dT; //[K]
des_params.m_HTR_eff_target = ms_des_par.m_HTR_eff_target; //[-]
des_params.m_HTR_eff_max = ms_des_par.m_HTR_eff_max; //[-]
des_params.m_HTR_od_UA_target_type = ms_des_par.m_HTR_od_UA_target_type;
//
des_params.m_eta_pc = ms_des_par.m_eta_pc;
des_params.m_des_tol = ms_des_par.m_des_tol;
des_params.m_des_opt_tol = ms_des_par.m_des_opt_tol;
des_params.m_is_des_air_cooler = ms_des_par.m_is_des_air_cooler; //[-]
des_params.m_des_objective_type = ms_des_par.m_des_objective_type; //[-]
des_params.m_min_phx_deltaT = ms_des_par.m_min_phx_deltaT; //[C]
des_params.m_fixed_P_mc_out = ms_des_par.m_fixed_P_mc_out; //[-]
des_params.m_PR_HP_to_LP_guess = ms_des_par.m_PR_HP_to_LP_guess; //[-]
des_params.m_fixed_PR_HP_to_LP = ms_des_par.m_fixed_PR_HP_to_LP; //[-]
des_params.m_f_PR_HP_to_IP_guess = ms_des_par.m_f_PR_HP_to_IP_guess; //[-]
des_params.m_fixed_f_PR_HP_to_IP = ms_des_par.m_fixed_f_PR_HP_to_IP; //[-]
des_params.m_is_recomp_ok = ms_des_par.m_is_recomp_ok;
des_params.m_is_bypass_ok = ms_des_par.m_is_bypass_ok;
des_params.m_is_turbinesplit_ok = ms_des_par.m_is_turbine_split_ok;
auto_err_code = mpc_sco2_cycle->auto_opt_design(des_params);
}
else
{
std::string ex_msg = "The " + s_cycle_config + " cycle and CSP integration design, design method can only be:"
" 1 = specify efficiency, 2 = specify total recup UA, 3 = Specify each recup design";
throw(C_csp_exception(ex_msg.c_str()));
}
if (auto_err_code != 0)
{
// Check if error code is handled (need to report out)
if (auto_err_code >= (int)C_sco2_cycle_core::E_cycle_error_msg::E_CANNOT_PRODUCE_POWER
&& auto_err_code < (int)C_sco2_cycle_core::E_cycle_error_msg::E_NO_ERROR)
{
return auto_err_code;
}
// Unhandled exception
else
throw(C_csp_exception(error_msg.c_str()));
}
if (error_msg.empty())
{
mc_messages.add_notice("The " + s_cycle_config + " cycle design optimization was successful");
}
else
{
string out_msg = "The sCO2 " + s_cycle_config + " cycle design optimization solved with the following warning(s):\n" + error_msg;
mc_messages.add_notice(out_msg);
}
ms_des_solved.ms_rc_cycle_solved = *mpc_sco2_cycle->get_design_solved();
// Initialize the PHX
mc_phx.initialize(ms_des_par.m_hot_fl_code, ms_des_par.mc_hot_fl_props, ms_des_par.m_phx_N_sub_hx, ms_des_par.m_phx_od_UA_target_type);
// Define state enumerable for sco2 into PHX
int phx_cold_inlet_state = C_sco2_cycle_core::HTR_HP_OUT;
if (ms_des_par.m_cycle_config == 3)
phx_cold_inlet_state = C_sco2_cycle_core::MIXER2_OUT;
else if (ms_des_par.m_cycle_config == 4)
phx_cold_inlet_state = C_sco2_cycle_core::LTR_HP_OUT;
// Design the PHX
// Calculate q_dot_phx using sco2 enthalpies and mass flow (using thermal efficiency does not work for htr bypass)
double q_dot_des_phx_old = ms_des_solved.ms_rc_cycle_solved.m_W_dot_net / ms_des_solved.ms_rc_cycle_solved.m_eta_thermal;
double q_dot_des_phx = ms_des_solved.ms_rc_cycle_solved.m_m_dot_t
* (ms_des_solved.ms_rc_cycle_solved.m_enth[C_sco2_cycle_core::TURB_IN]
- ms_des_solved.ms_rc_cycle_solved.m_enth[phx_cold_inlet_state]);
//ms_phx_des_par.m_Q_dot_design = ms_des_solved.ms_rc_cycle_solved.m_W_dot_net / ms_des_solved.ms_rc_cycle_solved.m_eta_thermal; //[kWt]
ms_phx_des_par.m_T_h_in = ms_des_par.m_T_htf_hot_in; //[K] HTF hot inlet temperature
// Okay, but CO2-HTF HX is assumed here. How does "structure inheritance" work?
ms_phx_des_par.m_P_h_in = 1.0; // Assuming HTF is incompressible...
ms_phx_des_par.m_P_h_out = 1.0; // Assuming HTF is incompressible...
// .................................................................................
ms_phx_des_par.m_T_c_in = ms_des_solved.ms_rc_cycle_solved.m_temp[phx_cold_inlet_state]; //[K]
ms_phx_des_par.m_P_c_in = ms_des_solved.ms_rc_cycle_solved.m_pres[phx_cold_inlet_state]; //[K]
ms_phx_des_par.m_P_c_out = ms_des_solved.ms_rc_cycle_solved.m_pres[C_sco2_cycle_core::TURB_IN]; //[K]
ms_phx_des_par.m_m_dot_cold_des = ms_des_solved.ms_rc_cycle_solved.m_m_dot_t; //[kg/s]
// Calculating the HTF mass flow rate in 'design_and_calc_m_dot_htf'
ms_phx_des_par.m_m_dot_hot_des = std::numeric_limits<double>::quiet_NaN();
// Set maximum effectiveness
ms_phx_des_par.m_eff_max = 1.0;
mc_phx.design_and_calc_m_dot_htf(ms_phx_des_par, q_dot_des_phx, ms_des_par.m_phx_dt_cold_approach, ms_des_solved.ms_phx_des_solved);
//*************************************************************************************
//*************************************************************************************
// Solve the Bypass HX (if necessary)
if (ms_des_par.m_cycle_config == 3)
{
// hard coded
int bp_N_subs_hx = ms_des_par.m_phx_N_sub_hx;
auto bp_od_UA_target_type = ms_des_par.m_phx_od_UA_target_type;
mc_bp.initialize(ms_des_par.m_hot_fl_code, ms_des_par.mc_hot_fl_props, bp_N_subs_hx, bp_od_UA_target_type);
// Calculate BP heat transfer
double m_dot_bp_sco2 = ms_des_solved.ms_rc_cycle_solved.m_bypass_frac * (ms_des_solved.ms_rc_cycle_solved.m_m_dot_t);
double q_dot_des_bp = m_dot_bp_sco2 * (ms_des_solved.ms_rc_cycle_solved.m_enth[C_sco2_cycle_core::BYPASS_OUT]
- ms_des_solved.ms_rc_cycle_solved.m_enth[C_sco2_cycle_core::MIXER_OUT]);
// Hot Parameters (HTF)
ms_bp_des_par.m_T_h_in = mc_phx.ms_des_solved.m_T_h_out; // [K] Inlet to Bypass is outlet of PHX
ms_bp_des_par.m_P_h_in = 1.0; // Assuming HTF is incompressible...
ms_bp_des_par.m_P_h_out = 1.0; // Assuming HTF is incompressible...
// Cold Parameters (sco2)
ms_bp_des_par.m_T_c_in = ms_des_solved.ms_rc_cycle_solved.m_temp[C_sco2_cycle_core::MIXER_OUT]; //[K]
ms_bp_des_par.m_P_c_in = ms_des_solved.ms_rc_cycle_solved.m_pres[C_sco2_cycle_core::MIXER_OUT]; //[K]
ms_bp_des_par.m_P_c_out = ms_des_solved.ms_rc_cycle_solved.m_pres[C_sco2_cycle_core::BYPASS_OUT]; //[K]
ms_bp_des_par.m_m_dot_cold_des = m_dot_bp_sco2; //[kg/s]
// Calculating the HTF mass flow rate in 'design_and_calc_m_dot_htf'
ms_bp_des_par.m_m_dot_hot_des = std::numeric_limits<double>::quiet_NaN();
// Set maximum effectiveness
ms_bp_des_par.m_eff_max = 1.0;
// Set Mass Flow (it is known because it is equal to PHX)
ms_bp_des_par.m_m_dot_hot_des = ms_phx_des_par.m_m_dot_hot_des;
// Design
if (ms_bp_des_par.m_m_dot_cold_des > 0 && q_dot_des_bp > 1e-2)
{
mc_bp.design_calc_UA(ms_bp_des_par, q_dot_des_bp, ms_des_solved.ms_bp_des_solved);
}
// No Mass Flow
else
{
ms_des_solved.ms_bp_des_solved.m_T_h_out = mc_phx.ms_des_solved.m_T_h_out;
ms_des_solved.ms_bp_des_solved.m_cost_bare_erected = 0;
ms_des_solved.ms_bp_des_solved.m_cost_equipment = 0;
ms_des_solved.ms_bp_des_solved.m_UA_design = 0;
ms_des_solved.ms_bp_des_solved.m_eff_design = 0;
ms_des_solved.ms_bp_des_solved.m_min_DT_design = 0;
ms_des_solved.ms_bp_des_solved.m_Q_dot_design = 0;
}
}
//DEBUG
if (true)
{
double cost_LTR = ms_des_solved.ms_rc_cycle_solved.ms_LTR_des_solved.m_cost_bare_erected + ms_des_solved.ms_rc_cycle_solved.ms_LTR_des_solved.m_cost_equipment;
double cost_HTR = ms_des_solved.ms_rc_cycle_solved.ms_HTR_des_solved.m_cost_bare_erected + ms_des_solved.ms_rc_cycle_solved.ms_HTR_des_solved.m_cost_equipment;
double cost_MC = ms_des_solved.ms_rc_cycle_solved.ms_mc_ms_des_solved.m_cost_bare_erected + ms_des_solved.ms_rc_cycle_solved.ms_mc_ms_des_solved.m_cost_equipment;
double cost_RC = ms_des_solved.ms_rc_cycle_solved.ms_rc_ms_des_solved.m_cost_bare_erected + ms_des_solved.ms_rc_cycle_solved.ms_rc_ms_des_solved.m_cost_equipment;
double cost_T = ms_des_solved.ms_rc_cycle_solved.ms_t_des_solved.m_bare_erected_cost + ms_des_solved.ms_rc_cycle_solved.ms_t_des_solved.m_equipment_cost;
double cost_PHX = mc_phx.ms_des_solved.m_cost_bare_erected + mc_phx.ms_des_solved.m_cost_equipment;
double cost_BP = mc_bp.ms_des_solved.m_cost_bare_erected + mc_bp.ms_des_solved.m_cost_equipment;
double cost_bare_erected = ms_des_solved.ms_rc_cycle_solved.ms_LTR_des_solved.m_cost_bare_erected
+ ms_des_solved.ms_rc_cycle_solved.ms_HTR_des_solved.m_cost_bare_erected
+ ms_des_solved.ms_rc_cycle_solved.ms_mc_ms_des_solved.m_cost_bare_erected
+ ms_des_solved.ms_rc_cycle_solved.ms_rc_ms_des_solved.m_cost_bare_erected
+ ms_des_solved.ms_rc_cycle_solved.ms_t_des_solved.m_bare_erected_cost
+ mc_phx.ms_des_solved.m_cost_bare_erected;
double cost_equipment = ms_des_solved.ms_rc_cycle_solved.ms_LTR_des_solved.m_cost_equipment
+ ms_des_solved.ms_rc_cycle_solved.ms_HTR_des_solved.m_cost_equipment
+ ms_des_solved.ms_rc_cycle_solved.ms_mc_ms_des_solved.m_cost_equipment
+ ms_des_solved.ms_rc_cycle_solved.ms_rc_ms_des_solved.m_cost_equipment
+ ms_des_solved.ms_rc_cycle_solved.ms_t_des_solved.m_equipment_cost
+ mc_phx.ms_des_solved.m_cost_equipment;
if (std::isnan(mc_bp.ms_des_solved.m_cost_bare_erected) == false)
{
cost_bare_erected += mc_bp.ms_des_solved.m_cost_bare_erected;
cost_equipment += mc_bp.ms_des_solved.m_cost_equipment;
}
double total_cost = cost_bare_erected + cost_equipment;
// Back Calculate Heat into cycle
double W_net = ms_des_solved.ms_rc_cycle_solved.m_W_dot_mc + ms_des_solved.ms_rc_cycle_solved.m_W_dot_rc + ms_des_solved.ms_rc_cycle_solved.m_W_dot_t;
double Q_pc = ms_des_solved.ms_rc_cycle_solved.m_m_dot_mc * (ms_des_solved.ms_rc_cycle_solved.m_enth[8] - ms_des_solved.ms_rc_cycle_solved.m_enth[0]);
double Q_tot = W_net + Q_pc;
int x = 0;
}
return auto_err_code;
}
int C_sco2_phx_air_cooler::off_design_fix_P_mc_in(S_od_par od_par,
double P_mc_in /*MPa*/, double T_mc_in /*K*/, double T_pc_in /*K*/,
bool is_rc_N_od_at_design, double rc_N_od_f_des /*-*/,
bool is_mc_N_od_at_design, double mc_N_od_f_des /*-*/,
bool is_pc_N_od_at_design, double pc_N_od_f_des /*-*/,
bool is_PHX_dP_input, double PHX_f_dP /*-*/,
C_sco2_phx_air_cooler::E_off_design_strategies off_design_strategy,
double od_opt_tol_in /*-*/, double od_tol /*-*/)
{
// This function sets T_mc_in and T_pc_in... May want to at these instead as arguments
setup_off_design_info(od_par);
ms_cycle_od_par.m_T_mc_in = T_mc_in; //[K]
ms_cycle_od_par.m_T_pc_in = T_pc_in; //[K]
// Now, call off-design with the input compressor inlet pressure
ms_cycle_od_par.m_P_LP_comp_in = P_mc_in*1.E3; //[kPa] convert from MPa
if (get_design_par()->m_cycle_config == 1)
{
if (ms_cycle_od_par.m_T_mc_in < N_co2_props::T_crit)
{
if (ms_cycle_od_par.m_P_LP_comp_in < N_co2_props::P_crit)
{
CO2_state co2_props;
// Then calculate the compressor inlet pressure that achieves this density at the off-design ambient temperature
CO2_TQ(ms_cycle_od_par.m_T_mc_in, 0.0, &co2_props);
double Psat = co2_props.pres; //[kPa]
if (ms_cycle_od_par.m_P_LP_comp_in < Psat)
{
ms_cycle_od_par.m_P_LP_comp_in = std::min(ms_cycle_od_par.m_P_LP_comp_in, 0.995*Psat);
}
else
{
ms_cycle_od_par.m_P_LP_comp_in = std::max(ms_cycle_od_par.m_P_LP_comp_in, 1.005*Psat);
}
}
else
{
ms_cycle_od_par.m_P_LP_comp_in = std::max(ms_cycle_od_par.m_P_LP_comp_in, 1.01*N_co2_props::P_crit);
}
}
}
// Input RC shaft speed controls
ms_cycle_od_par.m_is_rc_N_od_at_design = is_rc_N_od_at_design; //[-]
ms_cycle_od_par.m_rc_N_od_f_des = rc_N_od_f_des; //[-]
// Input MC shaft speed controls
ms_cycle_od_par.m_is_mc_N_od_at_design = is_mc_N_od_at_design; //[-]
ms_cycle_od_par.m_mc_N_od_f_des = mc_N_od_f_des; //[-]
// Input PC shaft speed controls
ms_cycle_od_par.m_is_pc_N_od_at_design = is_pc_N_od_at_design; //[-]
ms_cycle_od_par.m_pc_N_od_f_des = pc_N_od_f_des; //[-]
// PHX pressure drop options
ms_cycle_od_par.m_is_PHX_dP_input = is_PHX_dP_input; //[-]
ms_cycle_od_par.m_PHX_f_dP = PHX_f_dP; //[-]
double eta_od_solved = std::numeric_limits<double>::quiet_NaN();
int od_core_error_code = off_design_core(eta_od_solved, od_tol);
if (ms_od_solved.m_is_converged)
{
double W_dot_fan = std::numeric_limits<double>::quiet_NaN();
if (std::isfinite(mpc_sco2_cycle->get_design_solved()->ms_pc_air_cooler.m_UA_total))
{
int air_cooler_err_code = mpc_sco2_cycle->solve_OD_all_coolers_fan_power(ms_od_par.m_T_amb, od_tol, W_dot_fan);
if (air_cooler_err_code != 0)
{
W_dot_fan = std::numeric_limits<double>::quiet_NaN();
//throw(C_csp_exception("Off design air cooler model failed"));
}
}
}
ms_od_solved.ms_rc_cycle_od_solved = *mpc_sco2_cycle->get_od_solved();
ms_od_solved.ms_phx_od_solved = mc_phx.ms_od_solved;
return od_core_error_code;
}
void C_sco2_phx_air_cooler::setup_off_design_info(C_sco2_phx_air_cooler::S_od_par od_par)
{
ms_od_par = od_par;
ms_cycle_od_par.m_T_mc_in = ms_od_par.m_T_amb + ms_des_par.m_dt_mc_approach; //[K]
if (m_is_T_crit_limit)
{
if (ms_cycle_od_par.m_T_mc_in < m_T_mc_in_min)
{
std::string msg = util::format("The off-design main compressor inlet temperature is %lg [C]."
" The sCO2 cycle off-design code reset it to the minimum allowable main compressor inlet temperature: %lg [C].",
ms_cycle_od_par.m_T_mc_in - 273.15,
m_T_mc_in_min - 273.15);
ms_cycle_od_par.m_T_mc_in = m_T_mc_in_min;
}
if (ms_des_par.m_cycle_config == 2)
{
ms_cycle_od_par.m_T_pc_in = ms_od_par.m_T_amb + ms_des_par.m_dt_mc_approach; //[K]
if (ms_cycle_od_par.m_T_pc_in < m_T_mc_in_min)
{
std::string msg = util::format("The off-design main compressor in let temperture is %lg [C]."
" The sCO2 cycle off-design code reset it to the minimum allowable main compressor inlet temperature: %lg [C].",
ms_cycle_od_par.m_T_pc_in - 273.15,
m_T_mc_in_min - 273.15);
ms_cycle_od_par.m_T_pc_in = m_T_mc_in_min;
}
}
}
// Begin with no compressor bypass
ms_cycle_od_par.m_f_mc_pc_bypass = 0.0;
ms_cycle_od_par.m_tol = ms_des_par.m_des_tol; //[-]
// Defined downstream
ms_cycle_od_par.m_T_t_in = std::numeric_limits<double>::quiet_NaN(); //[K]
ms_cycle_od_par.m_P_LP_comp_in = std::numeric_limits<double>::quiet_NaN(); //[kPa]
// Define turbine inlet mode
ms_cycle_od_par.m_T_t_in_mode = ms_od_par.m_T_t_in_mode; //[-]
// Define ms_phx_od_par
ms_phx_od_par.m_T_h_in = ms_od_par.m_T_htf_hot; //[K]
ms_phx_od_par.m_P_h_in = ms_phx_des_par.m_P_h_in; //[kPa] Assuming fluid is incompressible in that pressure doesn't affect its properties
ms_phx_od_par.m_m_dot_h = ms_od_par.m_m_dot_htf; //[kg/s]
// Defined downstream
ms_phx_od_par.m_T_c_in = std::numeric_limits<double>::quiet_NaN(); //[K]
ms_phx_od_par.m_P_c_in = std::numeric_limits<double>::quiet_NaN(); //[kPa]
ms_phx_od_par.m_m_dot_c = std::numeric_limits<double>::quiet_NaN(); //[kg/s]
}
int C_sco2_phx_air_cooler::optimize_N_mc_and_N_rc__max_eta(C_sco2_phx_air_cooler::S_od_par od_par,
bool is_PHX_dP_input, double PHX_f_dP /*-*/,
C_sco2_phx_air_cooler::E_off_design_strategies off_design_strategy,
bool is_optimize_N_rc /*-*/, bool is_rc_N_od_at_design, double rc_N_od_f_des /*-*/,
bool is_optimize_N_mc /*-*/, bool is_mc_N_od_at_design, double mc_N_od_f_des /*-*/,
bool is_optimize_N_pc /*-*/, bool is_pc_N_od_at_design, double pc_N_od_f_des /*-*/,
double & eta_max /*-*/, double & f_N_mc_opt_out /*-*/,
double & f_N_rc_opt_out /*-*/, double & W_dot_at_eta_max /*kWe*/,
double od_opt_tol_in /*-*/, double od_tol /*-*/)
{
if (off_design_strategy == E_off_design_strategies::E_TARGET_T_HTF_COLD_POWER_MAX){
if (!is_optimize_N_rc && !is_optimize_N_mc && !is_optimize_N_pc) {
std::vector<C_sco2_phx_air_cooler::S_solve_P_LP_in__tracker> v_T_mc_in__tracker;
off_design__calc_T_pc_in__target_T_htf_cold__max_power(od_par,
is_rc_N_od_at_design, rc_N_od_f_des,
is_mc_N_od_at_design, mc_N_od_f_des,
is_pc_N_od_at_design, pc_N_od_f_des,
is_PHX_dP_input, PHX_f_dP,
od_opt_tol_in, od_tol,
v_T_mc_in__tracker);
return 0;
}
std::vector<double> x;
std::vector<double> lb;
std::vector<double> ub;
std::vector<double> scale;
if (ms_des_par.m_cycle_config == 2) {
// Main compressor
if (is_optimize_N_mc) {
x.push_back(1.0);
lb.push_back(0.5);
ub.push_back(1.0);
scale.push_back(-0.1);
}
// Recompressor
if (is_optimize_N_rc) {
x.push_back(1.0);
lb.push_back(0.5);
ub.push_back(1.0);
scale.push_back(-0.1);
}
// Precompressor
if (is_optimize_N_pc) {
x.push_back(1.0);
lb.push_back(0.5);
ub.push_back(1.0);
scale.push_back(-0.1);
}
}
else {
// Main compressor
if (is_optimize_N_mc) {
x.push_back(1.0);
lb.push_back(0.5);
ub.push_back(1.0);
scale.push_back(-0.1);
}
// Recompressor
if (is_optimize_N_rc && get_design_solved()->ms_rc_cycle_solved.m_is_rc) {
x.push_back(1.0);
lb.push_back(0.5);
ub.push_back(1.0);
scale.push_back(-0.1);
}
}
nlopt::opt opt_N__max_power(nlopt::LN_SBPLX, x.size());
opt_N__max_power.set_lower_bounds(lb);
opt_N__max_power.set_upper_bounds(ub);
opt_N__max_power.set_initial_step(scale);
opt_N__max_power.set_xtol_abs(0.05);
opt_N__max_power.set_ftol_rel(0.0005);
C_sco2_phx_air_cooler::C_to_N_mc_rc_opt inputs(this,
is_optimize_N_mc, is_mc_N_od_at_design, mc_N_od_f_des,
is_optimize_N_rc, is_rc_N_od_at_design, rc_N_od_f_des,
is_optimize_N_pc, is_pc_N_od_at_design, pc_N_od_f_des,
od_par,
is_PHX_dP_input, PHX_f_dP,
off_design_strategy,
od_opt_tol_in, od_tol);
try
{
opt_N__max_power.set_max_objective(nlopt_cb_opt_N_mc_rc, &inputs);
double max_obj = std::numeric_limits<double>::quiet_NaN();
nlopt::result result_opt_N = opt_N__max_power.optimize(x, max_obj);
}
catch (const std::exception&)
{
}
catch (C_csp_exception&)
{
return -1;
}
catch (...)
{
return -1;
}
// Get local 'x' and translate to shaft speed guess
double is_rc_N_od_at_design_local = is_rc_N_od_at_design;
double is_mc_N_od_at_design_local = is_mc_N_od_at_design;
double is_pc_N_od_at_design_local = is_pc_N_od_at_design;
double opt_rc_N_od_f_des = 1.0;
double opt_mc_N_od_f_des = 1.0;
double opt_pc_N_od_f_des = 1.0;
if (get_design_par()->m_cycle_config == 2) {
int i = 0;
if (is_optimize_N_mc) {
is_mc_N_od_at_design_local = false;
opt_mc_N_od_f_des = x[i];
i++;
}
if (is_optimize_N_rc) {
is_rc_N_od_at_design_local = false;
opt_rc_N_od_f_des = x[i];
i++;
}
if (is_optimize_N_pc) {
is_pc_N_od_at_design_local = false;
opt_pc_N_od_f_des = x[i];
}
}
else {
int i = 0;
if (is_optimize_N_mc) {
is_mc_N_od_at_design_local = false;
opt_mc_N_od_f_des = x[i];
i++;
}
if (is_optimize_N_rc && get_design_solved()->ms_rc_cycle_solved.m_is_rc) {
is_rc_N_od_at_design_local = false;
opt_rc_N_od_f_des = x[i];
}
}
std::vector<C_sco2_phx_air_cooler::S_solve_P_LP_in__tracker> v_T_mc_in__tracker;
off_design__calc_T_pc_in__target_T_htf_cold__max_power(od_par,
is_rc_N_od_at_design_local, opt_rc_N_od_f_des,
is_mc_N_od_at_design_local, opt_mc_N_od_f_des,
is_pc_N_od_at_design_local, opt_pc_N_od_f_des,
is_PHX_dP_input, PHX_f_dP,
od_opt_tol_in, od_tol,
v_T_mc_in__tracker);
return 0;
}
else {
double scope_step = 0.04; //[-]
double opt_step = 0.01; //[-]
// Guess f_n_mc
// solve (via optimizing n_rc), get eta
int err_mc_od = 0;
double f_N_mc = 1.0;
double eta_rc_max, f_N_rc_opt_local, W_dot_at_rc_opt_max;
eta_rc_max = f_N_rc_opt_local = W_dot_at_rc_opt_max = std::numeric_limits<double>::quiet_NaN();
if (is_optimize_N_rc)
{
err_mc_od = optimize_N_rc__max_eta(od_par,
false, f_N_mc,
is_PHX_dP_input, PHX_f_dP,
off_design_strategy,
eta_rc_max, f_N_rc_opt_local, W_dot_at_rc_opt_max,
-1.0, od_opt_tol_in, od_tol);
}
else
{
try
{
err_mc_od = off_design__constant_N__T_mc_in_P_LP_in__objective(od_par,
false, 1.0,
false, f_N_mc,
false, 1.0,
is_PHX_dP_input, PHX_f_dP,
off_design_strategy,
od_opt_tol_in, od_tol);
}
catch (C_csp_exception& csp_exception)
{
return -1;
}
}
if (err_mc_od != 0)
{
return err_mc_od;
}
double eta_f_N_mc = ms_od_solved.ms_rc_cycle_od_solved.m_eta_thermal; //[-]
double eta_baseline = eta_f_N_mc; //[-]
double f_N_rc_opt, P_LP_in_opt, T_mc_in_opt, T_pc_in_opt;
f_N_rc_opt = P_LP_in_opt = T_mc_in_opt = T_pc_in_opt = std::numeric_limits<double>::quiet_NaN();
f_N_rc_opt = f_N_rc_opt_local; //[-]
P_LP_in_opt = ms_od_solved.ms_rc_cycle_od_solved.m_pres[C_sco2_cycle_core::MC_IN]; //[kPa]
T_mc_in_opt = ms_od_solved.ms_rc_cycle_od_solved.m_temp[C_sco2_cycle_core::MC_IN]; //[K]
T_pc_in_opt = ms_od_solved.ms_rc_cycle_od_solved.m_temp[C_sco2_cycle_core::PC_IN]; //[K]
// Guess new f_n_mc = f_n_mc + scope_step
// solve, get eta
double f_N_mc_2 = f_N_mc + scope_step; //[-]
double f_N_rc_opt_local_2 = std::numeric_limits<double>::quiet_NaN();
if (is_optimize_N_rc)
{
err_mc_od = optimize_N_rc__max_eta(od_par,
false, f_N_mc_2,
is_PHX_dP_input, PHX_f_dP,
off_design_strategy,
eta_rc_max, f_N_rc_opt_local_2, W_dot_at_rc_opt_max,
f_N_rc_opt_local, od_opt_tol_in, od_tol);
}
else
{
try
{
err_mc_od = off_design__constant_N__T_mc_in_P_LP_in__objective(od_par,
false, 1.0,
false, f_N_mc_2,
false, 1.0,
is_PHX_dP_input, PHX_f_dP,
off_design_strategy,
od_opt_tol_in, od_tol);
}
catch (C_csp_exception& csp_exception)
{
err_mc_od = -1;
}
}
if (err_mc_od != 0)
{
f_N_mc_2 = f_N_mc - scope_step;
f_N_rc_opt_local_2 = std::numeric_limits<double>::quiet_NaN();
if (is_optimize_N_rc)
{
err_mc_od = optimize_N_rc__max_eta(od_par,
false, f_N_mc_2,
is_PHX_dP_input, PHX_f_dP,
off_design_strategy,
eta_rc_max, f_N_rc_opt_local_2, W_dot_at_rc_opt_max,
f_N_rc_opt_local, od_opt_tol_in, od_tol);
}
else
{
try
{
err_mc_od = off_design__constant_N__T_mc_in_P_LP_in__objective(od_par,
false, 1.0,
false, f_N_mc_2,
false, 1.0,
is_PHX_dP_input, PHX_f_dP,
off_design_strategy,
od_opt_tol_in, od_tol);
}
catch (C_csp_exception& csp_exception)
{
err_mc_od = -1;
}
}
if (err_mc_od != 0)
{
return err_mc_od;
}
}
double eta_f_N_mc_2 = ms_od_solved.ms_rc_cycle_od_solved.m_eta_thermal; //[-]
// Based on slope, guess new f_n_mc that will result in a new max eta
// ---- solve
// ---- repeat until new eta < max
double f_N_mc_opt, eta_low1, f_N_mc_low1, eta_low2, f_N_mc_low2, slope_sign;
eta_max = f_N_mc_opt = eta_low1 = f_N_mc_low1 = eta_low2 = f_N_mc_low2 = slope_sign = std::numeric_limits<double>::quiet_NaN();
if (eta_f_N_mc_2 > eta_f_N_mc)
{
eta_max = eta_f_N_mc_2; //[-]
f_N_mc_opt = f_N_mc_2; //[-]
f_N_rc_opt = f_N_rc_opt_local_2; //[-]
P_LP_in_opt = ms_od_solved.ms_rc_cycle_od_solved.m_pres[C_sco2_cycle_core::MC_IN]; //[kPa]
T_mc_in_opt = ms_od_solved.ms_rc_cycle_od_solved.m_temp[C_sco2_cycle_core::MC_IN]; //[K]
T_pc_in_opt = ms_od_solved.ms_rc_cycle_od_solved.m_temp[C_sco2_cycle_core::PC_IN]; //[K]
eta_low1 = eta_f_N_mc; //[-]
f_N_mc_low1 = f_N_mc; //[-]
slope_sign = (f_N_mc_2 - f_N_mc) / std::abs(f_N_mc_2 - f_N_mc); //[-]
}
else
{
eta_max = eta_f_N_mc; //[-]
f_N_mc_opt = f_N_mc; //[-]