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6.php
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6.php
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<?php
// ------------------------------------------------------------------------------
// Solar self consumption model: 1) Flat demand
// ------------------------------------------------------------------------------
$emoncms_dir = "/var/www/emoncms/";
$model_start = 1496404800;
$model_duration = 3600*24*365;
$model_end = $model_start + $model_duration;
$timestep = 30;
require "ModelHelper.php";
$data = new ModelHelper($emoncms_dir,$model_start,$timestep);
$data->input_feed("model:solar1",0);
$data->output_feed("model:solar");
$data->output_feed("model:use");
$data->output_feed("model:excess");
$data->output_feed("model:unmet");
$data->output_feed("model:cylinderT");
$data->output_feed("model:battery_energy");
$date = new DateTime();
$date->setTimezone(new DateTimeZone("UTC"));
$date->setTimestamp($model_start);
$startdayofweek = $date->format("N");
$startday = floor($model_start / 86400);
$solar_feed_capacity = 4000; // Solar feed is from a 3 kW system
$solar_capacity = 2500; // Model a 4kW system
$solar_kw = $solar_capacity * 0.001;
// Battery storage
$battery_capacity = 10.0;
$battery_energy = $battery_capacity * 0.5;
$solar_sum = 0;
$solar_kwh = 0;
$use_kwh = 0;
$excess_kwh = 0;
$unmet_kwh = 0;
$itterations = 0;
$cylinder_temperature = 10;
// Model loop
$time = $model_start;
while(true)
{
$day = floor($time / 86400);
$seconds_in_day = ($time - ($day*86400));
$hour_in_day = $seconds_in_day/3600;
$dayofweek = ($startdayofweek + ($day - $startday)) % 7;
// Read in solar PV dataset
$solar = $solar_capacity * $data->read("model:solar1",$time) / $solar_feed_capacity;
if ($solar>$solar_capacity) $solar = $solar_capacity; // max limit
if ($solar<0) $solar = 0; // min limit
$solar_sum += $solar; // used for mean
// -------------------------------------------------------------------------------
// 1. Central heating or other standby
// -------------------------------------------------------------------------------
$centralheating_standby = 15; // Watts
// -------------------------------------------------------------------------------
// 2. Internet router
// -------------------------------------------------------------------------------
$router = 12; // Watts
// -------------------------------------------------------------------------------
// 3. Internet router
// -------------------------------------------------------------------------------
$monitoring = 10; // Watts
// -------------------------------------------------------------------------------
// 4. Lighting
// -------------------------------------------------------------------------------
$lighting = 0;
if ($dayofweek>=0 && $dayofweek<5) {
if ($hour_in_day>=7.5 && $hour_in_day<8.5) $lighting = 11 + 11 + 12 + 11 + 6; // Watts
if ($hour_in_day>=18.0 && $hour_in_day<23.0) $lighting = 11 + 11 + 12 + 11+ 6; // Watts
} else {
if ($hour_in_day>=7.5 && $hour_in_day<23.0) $lighting = 11 + 11 + 12 + 11+ 6; // Watts
}
// -------------------------------------------------------------------------------
// 5. Laptop
// -------------------------------------------------------------------------------
$laptop1 = 0;
$laptop2 = 0;
if ($dayofweek>=0 && $dayofweek<5) {
if ($hour_in_day>=18.0 && $hour_in_day<23.0) $laptop1 = 40; // Watts
if ($hour_in_day>=20.0 && $hour_in_day<21.0) $laptop2 = 35; // Watts
} else {
if ($hour_in_day>=10.0 && $hour_in_day<22.0) $laptop1 = 40; // Watts
}
// -------------------------------------------------------------------------------
// 6. Fridge/Freezer
// -------------------------------------------------------------------------------
$fridge = 0;
if (($time % 3960)<600) $fridge = 120; // Watts
// -------------------------------------------------------------------------------
// 7. Washing machine
// -------------------------------------------------------------------------------
$washing = 0;
if ($dayofweek==4 && $hour_in_day>=10.0 && $hour_in_day<10.0+(900/3600)) $washing += 1700; // Watts
if ($dayofweek==4 && $hour_in_day>=10.0 && $hour_in_day<11.5) $washing += 150; // Watts
if ($dayofweek==1 && $hour_in_day>=10.0 && $hour_in_day<10.0+(900/3600)) $washing += 1700; // Watts
if ($dayofweek==1 && $hour_in_day>=10.0 && $hour_in_day<11.5) $washing += 150; // Watts
// -------------------------------------------------------------------------------
// 8. Kettle
// -------------------------------------------------------------------------------
$kettle = 0;
if ($dayofweek>=0 && $dayofweek<5) {
if ($hour_in_day>=7.5 && $hour_in_day<7.5+(120/3600)) $kettle = 3060; // Watts
if ($hour_in_day>=18.5 && $hour_in_day<18.5+(120/3600)) $kettle = 3060; // Watts
if ($hour_in_day>=21.0 && $hour_in_day<21.0+(120/3600)) $kettle = 3060; // Watts
} else {
if ($hour_in_day>=7.5 && $hour_in_day<7.5+(120/3600)) $kettle = 3060; // Watts
if ($hour_in_day>=11.0 && $hour_in_day<11.0+(120/3600)) $kettle = 3060; // Watts
if ($hour_in_day>=13.0 && $hour_in_day<13.0+(120/3600)) $kettle = 3060; // Watts
if ($hour_in_day>=18.5 && $hour_in_day<18.5+(120/3600)) $kettle = 3060; // Watts
if ($hour_in_day>=21.0 && $hour_in_day<21.0+(120/3600)) $kettle = 3060; // Watts
}
// -------------------------------------------------------------------------------
// 9. hob
// -------------------------------------------------------------------------------
$hob = 0;
if ($dayofweek>=0 && $dayofweek<5) {
if ($hour_in_day>=7.5 && $hour_in_day<7.5+(600/3600)) $hob = 1000; // Watts
if ($hour_in_day>=18.6 && $hour_in_day<18.6+(1200/3600)) $hob = 1500; // Watts
} else {
if ($hour_in_day>=7.5 && $hour_in_day<7.5+(600/3600)) $hob = 1000; // Watts
if ($hour_in_day>=13.0 && $hour_in_day<13.0+(600/3600)) $hob = 1000; // Watts
if ($hour_in_day>=18.6 && $hour_in_day<18.6+(1200/3600)) $hob = 1500; // Watts
}
// -------------------------------------------------------------------------------
// 10. EV Fixed rate charge
// -------------------------------------------------------------------------------
$evcharge = 0;
$ev = true;
if ($ev) {
// Monday
if ($dayofweek==0 && $hour_in_day>=9.0 && $hour_in_day<11.0) $evcharge = 10*230;
// Tuesday
if ($dayofweek==1 && $hour_in_day>=14.0 && $hour_in_day<16.0) $evcharge = 10*230;
// Wednesday
if ($dayofweek==2 && $hour_in_day>=10.0 && $hour_in_day<15.0) $evcharge = 10*230;
// Saturday morning
if ($dayofweek==5 && $hour_in_day>=9.0 && $hour_in_day<11.0) $evcharge = 10*230;
// Sunday all day
if ($dayofweek==6 && $hour_in_day>=9.0 && $hour_in_day<15.0) $evcharge = 10*230;
}
// -------------------------------------------------------------------------------
// TOTAL CONSUMPTION BEFORE HOT WATER STORE DIVERT
// -------------------------------------------------------------------------------
$use_before_hw = $centralheating_standby + $router + $monitoring + $lighting + $laptop1 + $laptop2 + $fridge + $washing + $kettle + $hob + $evcharge;
// 3. Calculate balance: supply - demand
$balanceA = $solar - $use_before_hw;
// -------------------------------------------------------------------------------
// 11. Battery storage
// -------------------------------------------------------------------------------
if ($balanceA>0) {
$charge = $balanceA;
$battery_delta = ($charge*0.95 * $timestep)/3600000.0;
if (($battery_energy+$battery_delta)<=$battery_capacity) {
$battery_energy += $battery_delta;
} else {
$charge = 0;
}
$balanceA -= $charge;
$use_before_hw += $charge;
} else {
$discharge = -$balanceA;
$battery_delta = (($discharge/0.95) * $timestep)/3600000.0;
if (($battery_energy-$battery_delta)>=0) {
$battery_energy -= $battery_delta;
} else {
$discharge = 0;
}
$balanceA += $discharge;
$use_before_hw -= $discharge;
}
// -------------------------------------------------------------------------------
// 11. Domestic hot water
// -------------------------------------------------------------------------------
$shower_flowrate = 0.07;
$shower_duration = 10*60; // 10 mins
$shower_temperature = 38;
$inlet_temperature = 10;
$tank_litres = 120;
$immersion_topup = 0;
$immersion_power = 0;
$dhw_heat = 0;
$tank_heat_loss = 0;
$dhw = true;
if ($dhw) {
if ($hour_in_day>=21.5 && $hour_in_day<(21.5+($shower_duration/3600))) {
// If cylinder temperature is hotter than desired shower temperature, mix in cold water and so reduce flow rate from cylinder.
if ($cylinder_temperature>=$shower_temperature) {
$cylinder_flowrate = $shower_flowrate * (($shower_temperature-$inlet_temperature)/($cylinder_temperature-$inlet_temperature));
} else {
// If cylinder temperature is the same as or less than shower temperature, flow rate is the same but topup may be required.
$cylinder_flowrate = $shower_flowrate;
$immersion_topup = 4184 * $cylinder_flowrate * ($shower_temperature-$cylinder_temperature);
}
$dhw_heat = 4184 * $cylinder_flowrate * ($cylinder_temperature-$inlet_temperature);
}
$tank_heat_loss = 0.88 * 0.667 * ($tank_litres/120) * ($cylinder_temperature - 22.0);
if ($balanceA>50.0 && $cylinder_temperature<60.0) {
$immersion_power = 1.0*$balanceA;
}
$cylinder_power = $immersion_power - $dhw_heat - $tank_heat_loss;
$cylinder_deltaT = ($cylinder_power * $timestep) / (4184 * $tank_litres);
$cylinder_temperature += $cylinder_deltaT;
}
// -------------------------------------------------------------------------------
// Final balance
// -------------------------------------------------------------------------------
$use = $use_before_hw + $immersion_power + $immersion_topup;
$balance = $solar - $use;
// 4. Calculate excess solar and unmet demand
$excess = 0;
$unmet = 0;
if ($balance>0.0) {
$excess = $balance;
} else {
$unmet = -1 * $balance;
}
// 5. Cumulative kWh calculation
$solar_kwh += ($solar * $timestep) / 3600000.0;
$use_kwh += ($use * $timestep) / 3600000.0;
$excess_kwh += ($excess * $timestep) / 3600000.0;
$unmet_kwh += ($unmet * $timestep) / 3600000.0;
// 6. Write output to output feed
$data->write("model:solar",$solar);
$data->write("model:use",$use);
$data->write("model:excess",$excess);
$data->write("model:unmet",$unmet);
$data->write("model:cylinderT",$cylinder_temperature);
$data->write("model:battery_energy",$battery_energy);
// Keep track of time and model end
$itterations ++;
$time += $timestep;
if ($time>$model_end) break;
}
$solar_self_use = ($solar_kwh - $excess_kwh);
$solar_self_use_prc = $solar_self_use / $solar_kwh;
$use_from_solar_prc = ($use_kwh - $unmet_kwh) / $use_kwh;
// Final results
$average = $solar_sum / $itterations;
print "Solar:\t\t".number_format($average,1)."W\t".round($solar_kwh)." kWh\n";
print "Use:\t\t\t".round($use_kwh)." kWh\n";
print "Excess:\t\t\t".round($excess_kwh)." kWh\n";
print "Unmet:\t\t\t".round($unmet_kwh)." kWh\n";
print "Solar self consumption:\t".round($solar_self_use_prc*100)." %\n";
print "Demand supplied from solar:\t".round($use_from_solar_prc*100)." %\n";
// Save output feeds
$data->save_all();