84 lines
3.0 KiB
JavaScript
84 lines
3.0 KiB
JavaScript
const ASM3 = require('./asm3_class')
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const math = require('mathjs')
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class Reactor_CSTR {
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constructor(volume, n_inlets, kla, initial_state) {
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this.state = initial_state;
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console.log(this.state);
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this.asm = new ASM3();
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this.Vl = volume; // fluid volume reactor [m3]
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this.Fs = Array(n_inlets).fill(0.0); // fluid debits per inlet [m3 d-1]
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this.Cs_in = Array.from(Array(n_inlets), () => new Array(13).fill(0.0)); // composition influents
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this.OTR = 0.0; // oxygen transfer rate [g O2 d-1]
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this.kla = kla; // if NaN, use external OTR [d-1]
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this.currentTime = Date.now(); // milliseconds since epoch [ms]
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this.timeStep = 1/(24*60*15) // time step [d]
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}
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set setInfluent(input) { // setter for C_in (WIP)
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let index_in = input.payload.inlet;
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this.Fs[index_in] = input.payload.F;
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this.Cs_in[index_in] = input.payload.C;
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}
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set setOTR(input) { // setter for OTR (WIP) [g O2 d-1]
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this.OTR = input.payload;
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}
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get getEffluent() { // getter for Effluent, defaults to inlet 0
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return {topic: "Fluent", payload: {inlet: 0, F: math.sum(this.Fs), C:this.state}, timestamp: this.currentTime};
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}
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calcOTR(S_O, T=20.0) { // caculate the OTR using basic correlation, default to temperature: 20 C
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let S_O_sat = 14.652 - 4.1022e-1*T + 7.9910e-3*T*T + 7.7774e-5*T*T*T;
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return this.kla * (S_O_sat - S_O);
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}
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// expect update with timestamp
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updateState(timestamp) {
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let newTime = timestamp;
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const day2ms = 1000 * 60 * 60 * 24;
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let n_iter = Math.floor((newTime - this.currentTime) / (this.timeStep * day2ms));
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if (n_iter > 0) {
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let n = 0;
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while (n < n_iter) {
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console.log(this.tick_fe(this.timeStep));
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n += 1;
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}
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this.currentTime += n_iter * this.timeStep * day2ms;
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n_iter = 0;
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}
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}
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tick_fe(time_step) { // tick reactor state using forward Euler method
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const r = this.asm.compute_dC(this.state);
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const dC_in = math.multiply(math.divide([this.Fs], this.Vl), this.Cs_in)[0];
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const dC_out = math.multiply(math.sum(this.Fs)/this.Vl, this.state);
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const t_O = Array(13).fill(0.0);
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t_O[0] = isNaN(this.kla) ? this.OTR : this.calcOTR(this.state[0]); // calculate OTR if kla is not NaN, otherwise use externaly calculated OTR
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const dC_total = math.multiply(math.add(dC_in, dC_out, r, t_O), time_step);
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this.state = math.add(this.state, dC_total);
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return this.state;
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}
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}
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// testing stuff
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// state: S_O, S_I, S_S, S_NH, S_N2, S_NO, S_HCO, X_I, X_S, X_H, X_STO, X_A, X_TS
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// let initial_state = [0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1];
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// const Reactor = new Reactor_CSTR(initial_state);
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// Reactor.C_in = [0.0, 30., 100., 16., 0., 0., 5., 25., 75., 30., 0., 0., 125.];
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// N = 0;
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// while (N < 500) {
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// console.log(Reactor.tick_fe(0.001));
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// N += 1;
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// }
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module.exports = Reactor_CSTR; |