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#include "ammonia.h" |
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|
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|
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/** |
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Ideal gas data for Ammonia, from Tillner-Roth, Harms-Watzenberg and |
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Baehr, 'Eine neue Fundamentalgleichung f端r Ammoniak', DKV-Tagungsbericht, |
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20:167-181, 1993. This is the ammmonia property correlation recommended |
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by NIST in its program REFPROP 7.0. |
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*/ |
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const IdealData ideal_data_ammonia = { |
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-15.815020 /* const */ |
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, 4.255726 /* linear */ |
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, 3 /* power terms */ |
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, (const IdealPowTerm[]){ |
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{11.474340, 1./3 } |
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,{-1.296211, -3./2.} |
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,{0.5706757, -7./4.} |
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} |
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, 0, (const IdealExpTerm *)0 /* no exponential terms */ |
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}; |
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|
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|
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/** |
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Residual (non-ideal) property data for Ammonia, from Tillner-Roth, |
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Harms-Watzenberg and Baehr, 'Eine neue Fundamentalgleichung f端r Ammoniak', |
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DKV-Tagungsbericht, 20:167-181, 1993. This is the ammmonia property correlation |
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recommended by NIST in its program REFPROP 7.0. |
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*/ |
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const HelmholtzData helmholtz_data_ammonia = { |
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/* R */ 488.189 /* J/kg/K */ |
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, /* M */ 17.03026 /* kg/kmol */ |
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, /* rho_star */225. /* kg/m続 */ |
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, /* T_star */ 405.40 /* K */ |
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, &ideal_data_ammonia |
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, 21 /* np */ |
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, (const HelmholtzPowTerm[]){ |
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/* a_i, t_i, d_i, l_i */ |
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{0.4554431E-1, -0.5 , 2, 0}/* 1 */ |
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,{0.7238548E+0, 0.5 , 1, 0 } |
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,{0.1229470E-1, 1 , 4, 0 } |
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,{-0.1858814E+1, 1.5 , 1, 0 } |
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,{0.2141882E-10, 3 , 15, 0 }/* 5 */ |
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,{-0.1430020E-1, 0 , 3, 1 } |
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,{0.3441324E+0, 3 , 3, 1 } |
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,{-0.2873571E+0, 4 , 1, 1 } |
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,{0.2352589E-4, 4 , 8, 1 } |
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,{-0.3497111E-1, 5 , 2, 1}/* 10 */ |
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,{0.2397852E-1, 3 , 1, 2} |
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,{0.1831117E-2, 5 , 8, 2} |
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,{-0.4085375E-1, 6 , 1, 2} |
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,{0.2379275E+0, 8 , 2, 2} |
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,{-0.3548972E-1, 8 , 3, 2}/* 15 */ |
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,{-0.1823729E+0, 10, 2, 2} |
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,{0.2281556E-1, 10 , 4, 2} |
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,{-0.6663444E-2, 5 , 3, 3} |
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,{-0.8847486E-2, 7.5, 1, 3} |
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,{0.2272635E-2 , 15 , 2, 3}/* 20 */ |
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,{-0.5588655E-3, 30, 4, 3} |
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} |
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, 0, 0 /* no exponential terms */ |
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}; |
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|
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|
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/* |
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Test suite. These tests attempt to validate the current code using |
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a few sample figures output by REFPROP 7.0. |
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|
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To run the test, compile and run as follows: |
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|
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gcc helmholtz.c ammonia.c -DTEST -o ammonia -lm && ./ammonia |
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|
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These tests all currently pass with a maximum error of 2%. The error |
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seems to arise in the enthalpy data for low temperatures. Haven't been |
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able to determine where the problem comes from. |
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*/ |
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#ifdef TEST |
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|
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#include <assert.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <math.h> |
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|
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typedef struct{double T,p,rho,h,s;} TestData; |
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const TestData td[]; const unsigned ntd; |
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|
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int main(void){ |
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unsigned n, i; |
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double rho, T, p, h, s; |
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const HelmholtzData *d; |
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|
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d = &helmholtz_data_ammonia; |
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double maxerr = 0; |
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|
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n = ntd; |
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fprintf(stderr,"Running through %d test points...\n",n); |
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|
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/* enthalpy offset is required to attain agreement with values from REFPROP */ |
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double Z = -1.4314814207e+05; |
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|
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/* entropy offset required to attain agreement with REFPROP */ |
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double Y = -4.7157087586e+02; |
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|
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/* a simple macro to actually do the testing */ |
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#define ASSERT_TOL(FN,PARAM1,PARAM2,PARAM3,VAL,TOL) {\ |
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double cval; cval = FN(PARAM1,PARAM2,PARAM3);\ |
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double err; err = cval - (double)(VAL);\ |
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double relerrpc = (cval-(VAL))/(VAL)*100;\ |
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if(fabs(relerrpc)>maxerr)maxerr=fabs(relerrpc);\ |
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if(fabs(err)>fabs(TOL)){\ |
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fprintf(stderr,"ERROR in line %d: value of '%s(%f,%f,%s)' = %f,"\ |
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" should be %f, error is %.10e (%.2f%%)!\n"\ |
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, __LINE__, #FN,PARAM1,PARAM2,#PARAM3, cval, VAL,cval-(VAL)\ |
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,relerrpc\ |
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);\ |
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exit(1);\ |
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}else{\ |
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fprintf(stderr," OK, %s(%f,%f,%s) = %8.2e with %.2f%% err.\n"\ |
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,#FN,PARAM1,PARAM2,#PARAM3,VAL,relerrpc\ |
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);\ |
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}\ |
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} |
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|
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fprintf(stderr,"PRESSURE TESTS\n"); |
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for(i=0; i<n;++i){ |
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p = td[i].p*1e6; |
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ASSERT_TOL(helmholtz_p, td[i].T+273.15, td[i].rho, d, p, p*2e-4); |
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} |
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|
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fprintf(stderr,"ENTROPY TESTS\n"); |
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for(i=0; i<n;++i){ |
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s = td[i].s*1e3 + Y; |
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ASSERT_TOL(helmholtz_s, td[i].T+273.15, td[i].rho, d, s, 100*s); |
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} |
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|
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fprintf(stderr,"ENTHALPY TESTS\n"); |
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for(i=0; i<n;++i){ |
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ASSERT_TOL(helmholtz_h, td[i].T+273.15, td[i].rho, d, td[i].h*1e3 + Z, 1E3); |
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} |
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|
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fprintf(stderr,"Tests completed OK (maximum error = %0.2f%%)\n",maxerr); |
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exit(0); |
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} |
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|
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/* |
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Some test data generated by REFPROP 7.0 for p=0.1, 1, 10, 20, 100 MPa. |
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*/ |
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const TestData td[] = { |
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/* {T/属C , p/MPa rho/(kg/m続) , h/(kJ/kg) , s/(kJ/kgK)} */ |
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{-7.0E+1, 1.E-1, 7.247478262E+2, 3.24282714E+1, 1.620191045E-1} |
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, {-3.358834071E+1, 1.E-1, 6.822948922E+2, 1.90753355E+2, 8.784304761E-1} |
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, {-3.358834071E+1, 1.E-1, 8.786678914E-1, 1.561014597E+3, 6.5982992E+0} |
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, {-2.0E+1, 1.E-1, 8.263382177E-1, 1.591688059E+3, 6.722856799E+0} |
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, {3.0E+1, 1.E-1, 6.82304266E-1, 1.700664077E+3, 7.115863679E+0} |
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, {8.0E+1, 1.E-1, 5.831571413E-1, 1.80978242E+3, 7.448946867E+0} |
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, {1.30E+2, 1.E-1, 5.097610128E-1, 1.922139191E+3, 7.746386561E+0} |
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, {1.80E+2, 1.E-1, 4.5299046E-1, 2.038924538E+3, 8.019355389E+0} |
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, {2.30E+2, 1.E-1, 4.076912096E-1, 2.160745608E+3, 8.274268056E+0} |
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, {2.80E+2, 1.E-1, 3.706742442E-1, 2.287955598E+3, 8.515225293E+0} |
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, {3.30E+2, 1.E-1, 3.398445366E-1, 2.420766836E+3, 8.745015419E+0} |
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, {3.80E+2, 1.E-1, 3.137636628E-1, 2.559300504E+3, 8.965613422E+0} |
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, {-7.0E+1, 1.E+0, 7.250581532E+2, 3.329212774E+1, 1.601599414E-1} |
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, {-2.0E+1, 1.E+0, 6.655956817E+2, 2.523244796E+2, 1.122985212E+0} |
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, {2.489509207E+1, 1.E+0, 6.029210949E+2, 4.603181705E+2, 1.878768996E+0} |
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, {2.489509207E+1, 1.E+0, 7.782283811E+0, 1.626522182E+3, 5.791613203E+0} |
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, {3.0E+1, 1.E+0, 7.573646544E+0, 1.64218808E+3, 5.843733285E+0} |
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, {8.0E+1, 1.E+0, 6.146734558E+0, 1.776840309E+3, 6.255779773E+0} |
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, {1.30E+2, 1.E+0, 5.259177246E+0, 1.900135075E+3, 6.582405217E+0} |
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, {1.80E+2, 1.E+0, 4.621587996E+0, 2.022912586E+3, 6.869456377E+0} |
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, {2.30E+2, 1.E+0, 4.132311779E+0, 2.148479127E+3, 7.132238182E+0} |
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, {2.80E+2, 1.E+0, 3.741648311E+0, 2.278233212E+3, 7.378029463E+0} |
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, {3.30E+2, 1.E+0, 3.421067224E+0, 2.412874791E+3, 7.610994396E+0} |
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, {3.80E+2, 1.E+0, 3.152561727E+0, 2.552781957E+3, 7.833784037E+0} |
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, {-7.0E+1, 1.E+1, 7.281133559E+2, 4.198085991E+1, 1.41957312E-1} |
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, {-2.0E+1, 1.E+1, 6.705474103E+2, 2.593441153E+2, 1.097500056E+0} |
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, {3.0E+1, 1.0E+1, 6.036532714E+2, 4.883773339E+2, 1.922486043E+0} |
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, {8.0E+1, 1.E+1, 5.191766069E+2, 7.375493941E+2, 2.682019021E+0} |
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, {1.251668991E+2, 1.0E+1, 3.566957919E+2, 1.064721249E+3, 3.546261425E+0} |
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, {1.251668991E+2, 1.0E+1, 1.215794756E+2, 1.450595358E+3, 4.515023005E+0} |
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, {1.30E+2, 1.0E+1, 1.006607688E+2, 1.533108854E+3, 4.721093813E+0} |
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, {1.80E+2, 1.0E+1, 6.013676382E+1, 1.830511847E+3, 5.423234397E+0} |
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, {2.30E+2, 1.E+1, 4.825185325E+1, 2.013315037E+3, 5.806541293E+0} |
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, {2.80E+2, 1.0E+1, 4.136336686E+1, 2.175462144E+3, 6.11393854E+0} |
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, {3.30E+2, 1.0E+1, 3.661170108E+1, 2.331445154E+3, 6.383938033E+0} |
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, {3.80E+2, 1.0E+1, 3.303984101E+1, 2.486570677E+3, 6.631017385E+0} |
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// we seem to have problems at low temperatures for 20 MPa, not sure why... |
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, {-7.0E+1, 2.E+1, 7.314110284E+2, 5.173429903E+1, 1.225158918E-1} |
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, {-6.0E+1, 2.E+1, 7.21003185E+2, 9.387141936E+1, 3.249807774E-1} |
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, {-5.0E+1, 2.E+1, 7.101928923E+2, 1.365435121E+2, 5.206147995E-1} |
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, {-4.0E+1, 2.E+1, 6.990247179E+2, 1.797203029E+2, 7.0988476E-1} |
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, {-3.0E+1, 2.E+1, 6.875346255E+2, 2.233556145E+2, 8.93131467E-1} |
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, {-2.0E+1, 2.E+1, 6.757461174E+2, 2.674043891E+2, 1.070658825E+0} |
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, {-1.0E+1, 2.E+1, 6.636692193E+2, 3.11832692E+2, 1.24277842E+0} |
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, {0.E+0, 2.0E+1, 6.513006059E+2, 3.566229991E+2, 1.409828141E+0} |
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, {1.0E+1, 2.E+1, 6.386239377E+2, 4.017767906E+2, 1.572177757E+0} |
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, {-2.0E+1, 1.E+2, 7.097079501E+2, 3.380654271E+2, 8.941118487E-1} |
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, {3.0E+1, 1.00E+2, 6.609898909E+2, 5.505822381E+2, 1.660051479E+0} |
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, {8.0E+1, 1.00E+2, 6.112193023E+2, 7.645876046E+2, 2.313447447E+0} |
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, {1.30E+2, 1.E+2, 5.605676047E+2, 9.797127692E+2, 2.88311668E+0} |
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, {1.80E+2, 1.00E+2, 5.091016945E+2, 1.197234461E+3, 3.391678155E+0} |
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, {2.30E+2, 1.00E+2, 4.577648376E+2, 1.417741767E+3, 3.853216148E+0} |
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, {2.80E+2, 1.00E+2, 4.085537409E+2, 1.640134431E+3, 4.274597549E+0} |
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, {3.30E+2, 1.00E+2, 3.638085408E+2, 1.86192272E+3, 4.658479239E+0} |
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, {3.80E+2, 1.00E+2, 3.251311703E+2, 2.080565949E+3, 5.006781049E+0} |
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}; |
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|
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const unsigned ntd = sizeof(td)/sizeof(TestData); |
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|
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#endif |
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