direct_view.php

<?php 
defined('EMONCMS_EXEC') or die('Restricted access');
global $path; 
if (!isset($building)) $building = 1;
?>
<!--[if IE]><script language="javascript" type="text/javascript" src="<?php echo $path;?>Lib/flot/excanvas.min.js"></script><![endif]-->
<script language="javascript" type="text/javascript" src="<?php echo $path;?>Lib/flot/jquery.flot.js"></script>
<script language="javascript" type="text/javascript" src="<?php echo $path;?>Lib/flot/jquery.flot.time.js"></script>

<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" />
<script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css" />

<ul class="nav nav-pills">
  <li>
  <a href="<?php echo $path; ?>dynamic/view/<?php echo $building; ?>">Dynamic Coheating</a>
  </li>
  <li class="active">
  <a href="<?php echo $path; ?>dynamic/heatingexplorer" >Heating Explorer</a>
  </li>
</ul>

<h2>Direct electric or gas heating period explorer</h2>

<p><b>Note:</b> Building model is based on a small single space building, floor area is 21m2, walls are 600mm thick stone with plaster on hard, 100mm insulation in roof, roof lights, solid floor. See details and picture <a href="http://openenergymonitor.org/emon/node/2783" >here</a></p>
<p>The saving vs continuous heating will be higher the less thermal mass is in the building construction and the higher the heat loss rate through the building fabric.</p><p>If the building is super insulated the difference between continuous and dynamic heating becomes neglible.</p><p>This could be explorer further in future versions of this simulator.</p>

<p><b>Theory: </b><a href="http://openenergymonitor.org/emon/node/2999">Building model</a></p>

<p>See also: <a href="heatpumpexplorer">Heatpump efficiency explorer</a></p><br>

<div class="input-prepend input-append">
  <span class="add-on">Set point: </span>
  <input id="setpoint" type="text" style="width:50px" value="18" />
  <span class="add-on">C</span>
</div>

<div class="input-prepend input-append" style="margin-left:10px">
  <span class="add-on">Heater output: </span>
  <input id="heateroutput" type="text" style="width:50px" value="2500" />
  <span class="add-on">W</span>
</div>

<div id="graph_bound" style="width:100%; height:400px; position:relative; ">
  <div id="graph"></div>
</div>

<b style="padding-left:18px">Heating period A </b>
<span id="amount-A" style="border: 0; color: #f6931f; font-weight: bold;" >6:30 - 10:00</span>

<div style="float:right">
<span id="amount-B" style="border: 0; color: #f6931f; font-weight: bold;" >17:30 - 23:00</span>
<b style="padding-right:18px"> Heating period B</b>
</div>
<div style="padding:10px 18px 10px 18px">
  <div id="slider-range-A"></div>
</div>
<div style="padding:10px 18px 20px 18px">
  <div id="slider-range-B"></div>
</div>

<table class="table">
<tr><td>Daily heating consumption: </td><td><span id="average_power"></span>W</td><td><span id="diff_continuous"></span><br>continuous heating</td></tr>
<tr><td>Average internal temperature: </td><td><span id="average_t3"></span>C</td><td></td></tr>
<tr><td>Average internal temperature when heating is on: </td><td><span id="average_t3_hon"></span>C</td><td></td></tr>
<tr><td>Average internal temperature during occupancy period: </td><td><span id="average_t3_sp"></span>C</td><td></td></tr>
<tr><td>Average outside temperature: </td><td><span id="average_outside"></span>C</td>
</table>

<div class="input-prepend input-append">
  <span class="add-on">External temperature mid point: </span>
  <input id="externalmid" type="text" style="width:50px" value="10" />
  <span class="add-on">W</span>
</div>

<div class="input-prepend input-append" style="margin-left:10px">
  <span class="add-on">External temperature swing: </span>
  <input id="externalswing" type="text" style="width:50px" value="0" />
  <span class="add-on">W</span>
</div>

<script id="source" language="javascript" type="text/javascript">

  var $graph_bound = $('#graph_bound');
  var $graph = $('#graph').width($graph_bound.width()).height($('#graph_bound').height());

  var start = 0, end = 0;
  var graph_data = [];
  var outside_data = [];  
  
  $(window).resize(function(){
    $graph.width($graph_bound.width());
    if (embed) $graph.height($(window).height());
    plot();
  });
  
  var occupancy_start_A = 7, occupancy_end_A = 9;
  var occupancy_start_B = 18, occupancy_end_B = 23;
  
  var heating_on_A = 6.5, heating_off_A = 10;
  var heating_on_B = 17.5, heating_off_B = 23;
  
  var setpoint = 18;
  var heateroutput = 2500;
  var hs = 0.4;
  
  var externalmid = 10;
  var externalswing = 0;
  
  var u1 = 130, k1 = 11000000, t1 = 10.0;
  var u2 = 340, k2 = 2500000, t2 = 10.0;
  var u3 = 712, k3 = 600000, t3 = 10.0;
  
  var wk = 1 / ((1/u1)+(1/u2)+(1/u3));
  
  var e1 = t1 * k1;
  var e2 = t2 * k3;
  var e3 = t3 * k2;
  
  var sum_power = 0,
      sum_t3 = 0,
      sum_t3_hon = 0,
      sum_t3_sp = 0,
      sum_outside = 0,
      count_hon = 0,
      coung_sp = 0;
   
  sim();
  plot();
  
  function sim()
  {  
    graph_data = [];
    outside_data = [];
    var start_t1 = t1;
    
    var timestep = 30;
    var itterations = 3600*24 / timestep;

    sum_power = 0;
    sum_t3 = 0;
    sum_t3_hon = 0;
    sum_t3_sp = 0;
    sum_outside = 0;
    count_hon = 0;
    coung_sp = 0;

    for (var i=0; i<itterations; i++)
    {
      var time = i * timestep * 1000; 
      
      var outside = externalmid - Math.cos(2*Math.PI*(i/itterations)) * externalswing;
      sum_outside += outside;
      
      var hour = time / 3600000;
      
      var heatinput = 0;
      
      // Heating schedule
      if ((hour>heating_on_A && hour<heating_off_A) || (hour>heating_on_B && hour<heating_off_B))
      {
        if (t3>setpoint+(hs/2)) heating = false;
        if (t3<setpoint-(hs/2)) heating = true;
        
        if (heating) heatinput = heateroutput;
        
        sum_t3_hon += t3;
        count_hon ++;
      }
      
      // Temperature at occupancy times
      if ((hour>occupancy_start_A && hour<occupancy_end_A) || (hour>occupancy_start_B && hour<occupancy_end_B))
      {
        sum_t3_sp += t3;
        coung_sp ++;
      }
      
      h3 = heatinput - u3*(t3 - t2);
      h2 = u3*(t3 - t2) - u2*(t2 - t1);      
      h1 = u2*(t2 - t1) - u1*(t1 - outside);

      e3 += h3 * timestep;
      e2 += h2 * timestep;
      e1 += h1 * timestep;
      
      t3 = e3 / k3;
      t2 = e2 / k2;
      t1 = e1 / k1;
                        
      graph_data.push([time,t3]);
      outside_data.push([time,outside]);
      end = time;
      
      sum_power += heatinput;
      sum_t3 += t3;
    }
    if (Math.abs(start_t1-t1)>hs*1.0) sim();
    
    var average_power = sum_power / itterations;
    $("#average_power").html(average_power.toFixed(0));
    
    var average_outside = sum_outside / itterations;
    $("#average_outside").html(average_outside.toFixed(2));
        
    $("#average_power").html(average_power.toFixed(0));
    var diff_continuous = (1 - (average_power / (wk * (setpoint-average_outside)))) * 100; 
    if (diff_continuous<0) moreless = "% More than"; else moreless = "% saving vs";
    $("#diff_continuous").html(Math.abs(diff_continuous).toFixed(0)+moreless);
        
    var average_t3 = sum_t3 / itterations;
    $("#average_t3").html(average_t3.toFixed(2));
    
    var average_t3_hon = sum_t3_hon / count_hon;
    $("#average_t3_hon").html(average_t3_hon.toFixed(2));

    var average_t3_sp = sum_t3_sp / coung_sp;
    $("#average_t3_sp").html(average_t3_sp.toFixed(2));
  }

  function plot()
  {
    var plot = $.plot($graph, [
      {data: graph_data, lines: { show: true, fill: false }},
      {data: outside_data, lines: { show: true, fill: false }}
    ], {
      grid: { show: true },
      xaxis: { mode: 'time', min: start, max: end },
      selection: { mode: "xy" }
    });
    /*
    var canvas = plot.getCanvas();
    var ctx = canvas.getContext('2d');
   
   ctx.fillStyle = "rgba(255,0,0,0.5)"; 
   ctx.rect(19,10,150,363);
   ctx.fill();
    */
    
  }
  
  $("#setpoint").keyup(function()
  {
    setpoint = parseFloat($(this).val());
    if (isNaN(setpoint)) setpoint = 0;
    sim();
    plot();
  });
  
  $("#heateroutput").keyup(function()
  {
    heateroutput = parseFloat($(this).val());
    if (isNaN(heateroutput)) heateroutput = 0;
    sim();
    plot();
  });
  
  $("#externalmid").keyup(function()
  {
    externalmid = parseFloat($(this).val());
    if (isNaN(externalmid)) externalmid = 0;
    sim();
    plot();
  });
  
  $("#externalswing").keyup(function()
  {
    externalswing = parseFloat($(this).val());
    if (isNaN(externalswing)) externalswing = 0;
    sim();
    plot();
  });
    
  $(function() {
    $( "#slider-range-A" ).slider({
      range: true,
      min: 0,
      max: 24,
      step: 0.5,
      values: [ heating_on_A, heating_off_A ],
      slide: function( event, ui ) {
        heating_on_A = ui.values[ 0 ];
        heating_off_A = ui.values[ 1 ];
        
        sim();
        plot();
     
        var minon = (ui.values[0] - Math.floor(ui.values[0])) * 60;
        if (minon<10) minon = "0"+minon;
        var minoff = (ui.values[1] - Math.floor(ui.values[1])) * 60;
        if (minoff<10) minoff = "0"+minoff;
        $( "#amount-A" ).html(Math.floor(ui.values[0])+":"+minon+" - "+Math.floor(ui.values[1])+":"+minoff );
      }
    });

    $( "#slider-range-B" ).slider({
      range: true,
      min: 0,
      max: 24,
      step: 0.5,
      values: [ heating_on_B, heating_off_B ],
      slide: function( event, ui ) {
        heating_on_B = ui.values[ 0 ];
        heating_off_B = ui.values[ 1 ];
        
        sim();
        plot();
  
        var minon = (ui.values[0] - Math.floor(ui.values[0])) * 60;
        if (minon<10) minon = "0"+minon;
        var minoff = (ui.values[1] - Math.floor(ui.values[1])) * 60;
        if (minoff<10) minoff = "0"+minoff;
        $( "#amount-B" ).html(Math.floor(ui.values[0])+":"+minon+" - "+Math.floor(ui.values[1])+":"+minoff );
      }
    });
    
    $( "#amount" ).val( "$" + $( "#slider-range" ).slider( "values", 0 ) + " - $" + $( "#slider-range" ).slider( "values", 1 ) );
  });
  
  </script>