TIMESTAMP house::sync_thermal(TIMESTAMP t1, double nHours){
DATETIME tv;
double t = 0.0;
gl_localtime(t1, &tv);
Tout = *pTout;
Tsolar = get_Tsolar(tv.hour, tv.month, Tair, *pTout);
solar_load = 0.0;
for (int i = 1; i<9; i++)
{
solar_load += (gross_wall_area*window_wall_ratio/8.0) * glazing_shgc * pSolar[i];
}
double netHeatrate = /*hvac_rated_capacity +*/ tload.heatgain*BTUPHPW + solar_load;
double Q1 = M_inv11*Tair + M_inv12*Tmaterials;
double Q2 = M_inv21*Tair + M_inv22*Tmaterials;
if (nHours > ROUNDOFF)
{
double q1 = exp(s1*nHours)*(Q1 + BB11*Tsolar/s1 + BB12*netHeatrate/s1) - BB11*Tsolar/s1
- BB12*netHeatrate/s1;
double q2 = exp(s2*nHours)*(Q2 - BB11*Tsolar/s2 - BB12*netHeatrate/s2) + BB11*Tsolar/s2
+ BB12*netHeatrate/s2;
Tair = q1*(s1-A22)/A21 + q2*(s2-A22)/A21;
Tmaterials = q1 + q2;
}
else
return TS_NEVER;
// calculate constants for solving time "t" to reach Tevent
const double W = (Q1 + (BB11*Tsolar)/s1 + BB12*netHeatrate/s1)*(s1-A22)/A21;
const double X = (BB11*Tsolar/s1 + BB12*netHeatrate/s1)*(s1-A22)/A21;
const double Y = (Q2 - (BB11*Tsolar)/s2 - BB12*netHeatrate/s2)*(s2-A22)/A21;
const double Z = (BB11*Tsolar/s2 + BB12*netHeatrate/s2)*(s2-A22)/A21;
// end new solution
// determine next internal event temperature
int n_solutions = 0;
double Tevent;
const double TcoolOn = cooling_setpoint+thermostat_deadband;
const double TcoolOff = cooling_setpoint-thermostat_deadband;
const double TheatOn = heating_setpoint-thermostat_deadband;
const double TheatOff = heating_setpoint+thermostat_deadband;
/* determine the temperature of the next event */
#define TPREC 0.01
if (hvac_rated_capacity < 0.0)
Tevent = TcoolOff;
else if (hvac_rated_capacity > 0.0)
Tevent = TheatOff;
else if (Tair <= TheatOn+TPREC)
Tevent = TheatOn;
else if (Tair >= TcoolOn-TPREC)
Tevent = TcoolOn;
else
return TS_NEVER;
#ifdef OLD_SOLVER
if (nHours > TPREC)
// int dual_decay_solve(double *ans, double prec, double start, double end, int f, double a, double n, double b, double m, double c)
n_solutions = dual_decay_solve(&t,TPREC,0.0 ,nHours,W,s1,Y,s2,Z-X-Tevent);
Tair = Tevent;
if (n_solutions<0)
gl_error("house: solver error");
else if (n_solutions == 0)
return TS_NEVER;
else if (t == 0)
t = 1.0/3600.0; // one second
return t1+(TIMESTAMP)(t*3600*TS_SECOND);
#else
t = e2solve(W,s1,Y,s2,Z-X-Tevent);
Tair = Tevent;
if (isfinite(t))
{
return t1+(TIMESTAMP)(t*3600*TS_SECOND);
}
else
return TS_NEVER;
#endif
}
/* Sync is called when the clock needs to advance on the bottom-up pass */
TIMESTAMP office::sync(TIMESTAMP t0, TIMESTAMP t1)
{
/* load calculations */
update_lighting(t0,t1);
update_plugs(t0,t1);
/* local aliases */
const double &Tout = (*(zone.current.pTemperature));
const double &Ua = (zone.design.exterior_ua);
const double &Cm = (zone.design.interior_mass);
const double &Um = (zone.design.interior_ua);
double &Ti = (zone.current.air_temperature);
double &dTi = (zone.current.temperature_change);
double &Tm = (zone.current.mass_temperature);
HCMODE &mode = (zone.hvac.mode);
/* advance the thermal state of the building */
const double dt1 = t0>0 ? (double)(t1-t0)*TS_SECOND : 0;
if (dt1>0)
{
const double dt = dt1/3600; /* model operates in units of hours */
/* calculate model update */
if (c2!=0)
{
/* update temperatures */
const double e1 = k1*exp(r1*dt);
const double e2 = k2*exp(r2*dt);
Ti = e1 + e2 + Teq;
Tm = ((r1-c1)*e1 + (r2-c1)*e2 + c6)/c2 + Teq;
if (warn_control)
{
/* check for air temperature excursion */
if (Ti<warn_low_temp || Ti>warn_high_temp)
{
OBJECT *obj = OBJECTHDR(this);
DATETIME dt0, dt1;
gl_localtime(t0,&dt0);
gl_localtime(t1,&dt1);
char ts0[64], ts1[64];
gl_warning("office:%d (%s) air temperature excursion (%.1f degF) at between %s and %s",
obj->id, obj->name?obj->name:"anonymous", Ti,
gl_strtime(&dt0,ts0,sizeof(ts0))?ts0:"UNKNOWN", gl_strtime(&dt1,ts1,sizeof(ts1))?ts1:"UNKNOWN");
}
/* check for mass temperature excursion */
if (Tm<warn_low_temp || Tm>warn_high_temp)
{
OBJECT *obj = OBJECTHDR(this);
DATETIME dt0, dt1;
gl_localtime(t0,&dt0);
gl_localtime(t1,&dt1);
char ts0[64], ts1[64];
gl_warning("office:%d (%s) mass temperature excursion (%.1f degF) at between %s and %s",
obj->id, obj->name?obj->name:"anonymous", Tm,
gl_strtime(&dt0,ts0,sizeof(ts0))?ts0:"UNKNOWN", gl_strtime(&dt1,ts1,sizeof(ts1))?ts1:"UNKNOWN");
}
}
/* calculate the power consumption */
zone.total.energy += zone.total.power * dt;
}
const double Ca = 0.2402 * 0.0735 * zone.design.floor_height * zone.design.floor_area;
/* update enduses and get internal heat gains */
Qi = zone.lights.enduse.heatgain + zone.plugs.enduse.heatgain;
/* compute solar gains */
Qs = 0;
int i;
for (i=0; i<9; i++)
Qs += zone.design.window_area[i] * zone.current.pSolar[i]/10;
Qs *= 3.412;
if (Qs<0)
throw "solar gain is negative?!?";
/* compute heating/cooling effect */
Qh = update_hvac();
if (Ca<=0)
throw "Ca must be positive";
if (Cm<=0)
throw "Cm must be positive";
// split gains to air and mass
double f_air = 1.0; /* adjust the fraction of gains that goes to air vs mass */
double Qa = Qh + f_air*(Qi + Qs);
double Qm = (1-f_air)*(Qi + Qs);
c1 = -(Ua + Um)/Ca;
c2 = Um/Ca;
c3 = (Qa + Tout*Ua)/Ca;
c6 = Qm/Cm;
c7 = Qa/Ca;
double p1 = 1/c2;
if (Cm<=0)
throw "Cm must be positive";
c4 = Um/Cm;
c5 = -c4;
if (c2<=0)
throw "Um must be positive";
double p2 = -(c5+c1)/c2;
double p3 = c1*c5/c2 - c4;
double p4 = -c3*c5/c2 + c6;
if (p3==0)
throw "Teq is not finite";
Teq = p4/p3;
/* compute solution roots */
if (p1==0)
throw "internal error (p1==0 -> Ca==0 which should have caught)";
const double ra = 2*p1;
const double rb = -p2/ra;
const double rr = p2*p2-4*p1*p3;
if (rr<0)
throw "thermal solution does not exist";
const double rc = sqrt(rr)/ra;
r1 = rb+rc;
r2 = rb-rc;
if (r1>0 || r2>0)
throw "thermal solution has runaway condition";
/* compute next initial condition */
dTi = c2*Tm + c1*Ti - (c1+c2)*Tout + c7;
k1 = (r2*Ti - r2*Teq - dTi)/(r2-r1);
k2 = (dTi - r1*k1)/r2;
/* calculate power */
zone.total.power = zone.lights.enduse.power + zone.plugs.enduse.power + zone.hvac.enduse.power;
if (warn_control)
{
/* check for heating equipment sizing problem */
if ((mode==HC_HEAT || mode==HC_AUX) && Teq<TheatOff)
{
OBJECT *obj = OBJECTHDR(this);
DATETIME dt0, dt1;
gl_localtime(t0,&dt0);
gl_localtime(t1,&dt1);
char ts0[64], ts1[64];
gl_warning("office:%d (%s) %s heating undersized between %s and %s",
obj->id, obj->name?obj->name:"anonymous", mode==HC_HEAT?"primary":"auxiliary",
gl_strtime(&dt0,ts0,sizeof(ts0))?ts0:"UNKNOWN", gl_strtime(&dt1,ts1,sizeof(ts1))?ts1:"UNKNOWN");
}
/* check for cooling equipment sizing problem */
else if (mode==HC_COOL && Teq>TcoolOff)
{
OBJECT *obj = OBJECTHDR(this);
DATETIME dt0, dt1;
gl_localtime(t0,&dt0);
gl_localtime(t1,&dt1);
char ts0[64], ts1[64];
gl_warning("office:%d (%s) cooling undersized between %s and %s",
obj->id, obj->name?obj->name:"anonymous", mode==HC_COOL?"COOL":"ECON",
gl_strtime(&dt0,ts0,sizeof(ts0))?ts0:"UNKNOWN", gl_strtime(&dt1,ts1,sizeof(ts1))?ts1:"UNKNOWN");
}
/* check for economizer control problem */
else if (mode==HC_ECON && Teq>TcoolOff)
{
OBJECT *obj = OBJECTHDR(this);
DATETIME dt;
gl_localtime(t1,&dt);
char ts[64];
gl_warning("office:%d (%s) insufficient economizer control at %s",
obj->id, obj->name?obj->name:"anonymous", gl_strtime(&dt,ts,sizeof(ts))?ts:"UNKNOWN");
}
}
}
/* determine the temperature of the next event */
if (Tevent == Teq)
return -(t1+(TIMESTAMP)(3600*TS_SECOND)); /* soft return not more than an hour */
/* solve for the time to the next event */
double dt2=(double)TS_NEVER;
dt2 = e2solve(k1,r1,k2,r2,Teq-Tevent)*3600;
if (isnan(dt2) || !isfinite(dt2) || dt2<0)
{
if (dTi==0)
/* never more than an hour because of the occupancy schedule */
return -(t1+(TIMESTAMP)(3600*TS_SECOND)); /* soft return */
/* do not allow more than 1 degree/hour temperature change before solving again */
dt2 = fabs(3600/dTi);
if (dt2>3600)
dt2 = 3600; /* never more than an hour because of the occupancy schedule */
return -(t1+(TIMESTAMP)(dt2*TS_SECOND)); /* soft return */
}
if (dt2<TS_SECOND)
return t1+1; /* need to do a second pass to get next state */
else
return t1+(TIMESTAMP)(dt2*TS_SECOND); /* return t2>t1 on success, t2=t1 for retry, t2<t1 on failure */
}
