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<!DOCTYPE html>
<!-- Licensed under CC BY-NC 4.0 — https://creativecommons.org/licenses/by-nc/4.0/ -->
<!-- Copyright (c) 2026 Jim Miller. Non-commercial use only. -->
<html lang="en" id="helpScroller">
<head>
<title>RTU Bin-Method Calculator</title>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
<meta name="Author" content="Jim Miller" />
<meta name="keywords" content="HVAC,UAC,cost,estimator,calculator,bin,analysis,energy,unitary,air,conditioner,pychrometric,economic,savings,charting,sensible,correction,mixed,air,design,cities,states,stages,cycling,degradation" />
<meta name="robots" content="noindex, nofollow" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<!-- The navigation menu -->
<link href="sitemap.css?v=20" rel="stylesheet" type="text/css">
<script src="jquery-3.7.1.min.js?v=3"></script>
<script src="utilities.js?v=45"></script>
<script src="pageStuff.js?v=3"></script>
<link rel="stylesheet" type="text/css" media="screen" href="shared/styles_base.css" />
<link rel="stylesheet" type="text/css" media="screen" href="shared/styles_public-server.css?101" />
<link rel="stylesheet" type="text/css" media="screen" href="shared/styles_bmc.css?126" />
<script src="help_viewer.js"></script>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
google.charts.load('current', {'packages':['corechart']});
</script>
<!-- The navigation menu -->
<script>
$(window).on('load', function() {
pS.init({"pageDesc":"Bin-Method Calculator"});
});
</script>
</head>
<body class="col1 CEpage">
<!-- The navigation menu -->
<div id="navDiv"></div>
<img class="menuicon" id="opener" src="images/menu.svg" alt="" style="cursor:pointer; position:absolute; top:6px; left:8px;">
<div id="page">
<div id="subBanner" style="width: 940px; height: 40px; display: flex; overflow: hidden; border-radius: 7px 7px 0 0;">
<div style="width: 25%; height: 100%; background-color: #0A5F23;"></div>
<div style="width: 75%; height: 100%; background-color: #707276; display: flex; align-items: center; padding-left: 20px;">
<span style="color: white; font-size: 22px; font-weight:500; font-family: Arial, sans-serif;">Bin Method Calculator — RTU Cooling Energy</span>
</div>
</div>
<div id="container">
<div id="main" style="margin-bottom:4px;">
<!-- ============================================================ -->
<!-- CONTROLS VIEW -->
<!-- ============================================================ -->
<div id="bpfWarningArea" style="display:none; color:#cc0000; font-weight:bold; padding:4px 8px; margin-bottom:4px;"></div>
<div id="controlsView">
<table class='controls'>
<form name='HECACParameters' onsubmit="return false;">
<input type='hidden' name='txtResetMode' id='txtResetMode' value=''/>
<tr>
<td class='headers col1'></td>
<td class='headers col2'>
<input type='button' style='width:50pt;' value='Reload' onclick='Reload_engine()' />
</td>
<td class='headers col3'>
<input type='button' style='width:50pt;' value='Submit' onclick='submitToEngine();' />
<span class='help-icon-light' onclick="OpenWindow('SavingRuns');" title='Submit these parameters to the calculator and display the results page.'></span>
</td>
<td class='headers col4' colspan='3'>
<input type='button' style='width:50pt;' value='Restore' onclick='restoreDefaults();' />
<input type='button' class='bmAdvanced' style='width:50pt; display:none;' value='Power' onclick='resetPowerDefaults();' />
<span class='help-icon-light bmAdvanced' style='display:none;' onclick="OpenWindow('Defaults');" title='Restore all defaults or reset power controls.'></span>
<span class='help-icon-light bmAdvancedHide' onclick="OpenWindow('Defaults');" title='Restore all defaults.'></span>
</td>
</tr>
<tr>
<td id='tdInstructions' rowspan=20 style="vertical-align: top; text-align: left;">
The bin-method calculator simulates the energy usage of both a high
efficiency and a standard efficiency rooftop unit (RTU) air conditioner. It
then compares their energy and economic performance.
<br><br>
This calculator is primarily a demonstration of the bin-method. Its output should
only be used in preliminary analysis and NOT for final purchasing decisions.
<br><br>
To run the calculator, characterize the two systems and their environment
using the features on this page. Then click the "Submit" button.
Use the "Restore" button to change all features back to their
<a class="Jump" href="javascript: OpenWindow('Defaults');">defaults</a>.
<br><br>
Move your cursor over an information icon near a feature's name to display a
<a class="Jump" href="javascript: OpenWindow('Intro');">help</a> tip. Click on the icon for more
details.
<br><br>
The <a class="Jump" target="_blank" href='quickstart.html'>quick start</a> provides instructions for using the calculator.
The engineering <a class="Jump" target="_blank" href='methods/methods_outline.html'>methods</a> describe the calculations.
Review the supporting <a class="Jump" target="_blank" href='downloads.html'>documents</a>
and revision <a class="Jump" target="_blank" title="Revision History" href='RevisionHistory.html'>history</a>.
</td>
<!-- Advanced Features -->
<td class='rowname'>
Advanced Features <span class='help-icon' onclick="OpenWindow('Advanced_controls');" title='Advanced Features: Unhide the advanced calculator features (and initialize them to their default values).'></span>
</td>
<td class='controls'>
<input type='checkbox' name='chkAdvancedControls' id='chkAdvancedControls' onclick='toggleAdvanced()' />
<input type='hidden' id='txtSlope' name='txtSlope' value='' size='4' />
<input type='hidden' id='txtIntercept' name='txtIntercept' value='' size='4' />
</td>
<td class='def' colspan='3' id='tdAdvancedControls_default'>Hidden</td>
</tr>
<!-- Show bin calculations -->
<tr>
<td class='rowname'>
Show bin calculations <span class='help-icon' onclick="OpenWindow('Show_bin_calculations');" title='Show bin calculations: Show the detailed calcs for each outside dry-bulb bin.'></span>
</td>
<td class='controls'>
<input type='checkbox' name='chkDetails' onclick="checkForDefaults('chkDetails')" />
</td>
<td class='def' colspan='3' id='tdDetails_default'>Hide bin calcs</td>
</tr>
<!-- Lock load line (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Lock load line <span class='help-icon' onclick="OpenWindow('Lock_load_line');" title='Lock load line: Preserve the non-ventilation load line for use in any submits that follow.'></span>
</td>
<td class='controls'>
<input type='checkbox' name='chkLockLoadLine' onclick="checkForDefaults('chkLockLoadLine'); fetchLoadLine();" />
</td>
<td class='def' colspan='3' id='tdLockLoadLine_default'>Automatically adjust</td>
</tr>
<tr><td class='breakRow' colspan='5'></td></tr>
<!-- Building Type -->
<tr>
<td class='rowname'>
Building Type <span class='help-icon' onclick="OpenWindow('Building_Type');" title='Building Type: Select the building type which best represents your building.'></span>
<input type='hidden' name='txtSI_Fraction_NotAdvanced' value='0.527' />
<input type='hidden' name='txtVentilationValue_NotAdvanced' value='24' />
<span class='bmAdvanced' style='display:none'>
<input type='hidden' name='txtSI_Fraction' id='txtSI_Fraction' value='0.527' />
<br><input type='button' style='width:40pt; height:18pt;' value='Apply' onclick='SubmitTheBuildingModelParameters();' />
<span class='help-icon' onclick="OpenWindow('Custom_Load_Model');" title='Custom Load Model: Edit load-model parameters and click the "Apply" button.'></span>
</span>
</td>
<td class='controls' id='tdBuildingType_controlscell'>
<input type='hidden' id='txtBuildingType_previousvalue_hidden' name='txtBuildingType_previousvalue_hidden' value='Office-Medium' />
<select size='1' name='cmbBuildingType' id='cmbBuildingType' onchange="onChangeHandler('cmbBuildingType'); checkForDefaults('cmbBuildingType')">
<option>Apartment-MidRise</option>
<option>Healthcare-Hospital</option>
<option>Healthcare-Outpatient</option>
<option>Hotel-Large</option>
<option>Office-Small</option>
<option selected>Office-Medium</option>
<option>Office-Large</option>
<option>Restaurant-FastFood</option>
<option>Restaurant-SitDown</option>
<option>Retail-StandAlone</option>
<option>Retail-StripMall</option>
<option>School-Primary</option>
<option>School-Secondary</option>
<option>Warehouse</option>
</select>
<input type='hidden' id='txtBuildingType_hidden' name='txtBuildingType_hidden' value='Office-Medium' />
<input type='hidden' id='txtBM_Slope_hidden' name='txtBM_Slope_hidden' value='' />
<input type='hidden' id='txtBM_Intercept_hidden' name='txtBM_Intercept_hidden' value='' />
<input type='hidden' id='txtBM_VentSlopeFraction_hidden' name='txtBM_VentSlopeFraction_hidden' value='' />
<input type='hidden' id='txtBM_postingstate' name='txtBM_postingstate' value='' size='1' />
<span class='bmAdvanced' style='display:none'><br>
<input type='text' class='alignright' style='width:3.6em;' id='txtBM_Slope' name='txtBM_Slope' value='' size='1' onchange="onChangeHandler('txtBM_Slope')" />S
<input type='text' class='alignright' style='width:4.1em;' id='txtBM_Intercept' name='txtBM_Intercept' value='' size='1' onchange="onChangeHandler('txtBM_Intercept')" />Int
<input type='text' class='alignright' style='width:2.2em;' id='txtBM_VentSlopeFraction' name='txtBM_VentSlopeFraction' value='' size='1' onchange="onChangeHandler('txtBM_VentSlopeFraction')" />VSF
</span>
</td>
<td class='def' colspan='3' id='tdBuildingType_default'>Office-Medium</td>
</tr>
<!-- State / City -->
<tr>
<td class='rowname'>
State / City <span class='help-icon' onclick="OpenWindow('State');" title='State/City: The "State" control affects the lists of cities appearing in the "Cities" control.'></span>
</td>
<td class='controls'>
<select size='1' name='cmbState' id='cmbState' onchange="checkForDefaults('cmbState'); updateCities(); recalcVentilation()">
<option>AK</option><option>AL</option><option>AR</option><option>AZ</option><option>CA</option>
<option>CO</option><option>CT</option><option>DE</option><option>FL</option><option>GA</option>
<option>HI</option><option>IA</option><option>ID</option><option>IL</option><option>IN</option>
<option>KS</option><option>KY</option><option>LA</option><option>MA</option><option>MD</option>
<option>ME</option><option>MI</option><option>MN</option><option selected>MO</option><option>MS</option>
<option>MT</option><option>NC</option><option>ND</option><option>NE</option><option>NH</option>
<option>NJ</option><option>NM</option><option>NV</option><option>NY</option><option>OH</option>
<option>OK</option><option>OR</option><option>PA</option><option>PR</option><option>RI</option>
<option>SC</option><option>SD</option><option>TN</option><option>TX</option><option>UT</option>
<option>VA</option><option>VT</option><option>WA</option><option>WI</option><option>WV</option>
<option>WY</option>
</select>
<select size='1' name='cmbCityName2' id='cmbCityName2' onchange="checkForDefaults('cmbCityName2'); recalcVentilation()">
<option value='COLUMBIA'>Columbia</option>
<option selected value='KANSAS CITY'>Kansas City</option>
<option value='SPRINGFIELD'>Springfield</option>
<option value='ST. LOUIS'>St. Louis</option>
</select>
</td>
<td class='def' colspan='1' id='tdState_default'>MO</td>
<td class='def' colspan='2' id='tdCity_default'>Kansas City</td>
</tr>
<!-- Schedule -->
<tr>
<td class='rowname'>
Schedule <span class='help-icon' onclick="OpenWindow('Schedule');" title='Schedule: This defines the time during which the building is assumed to be occupied.'></span>
</td>
<td class='controls'>
<select size='1' name='cmbSchedule' id='cmbSchedule' onchange="checkForDefaults('cmbSchedule'); recalcVentilation()">
<option>All week, 6 a.m. to 10 p.m.</option>
<option>All week, 6 a.m. to Midnight</option>
<option>All week, All day</option>
<option>M-Fri, 7 a.m. to 5 p.m.</option>
<option selected>M-Fri, 7 a.m. to 7 p.m.</option>
<option>M-Fri, 9am - 10pm; Sun 11-6</option>
</select>
</td>
<td class='def' colspan='3' id='tdSchedule_default'>M-Fri, 7a.m. to 7p.m.</td>
</tr>
<!-- Indoor Temperature -->
<tr>
<td class='rowname'>
Indoor Temperature <span class='help-icon' onclick="OpenWindow('Indoor_Temperature');" title='Indoor Temperature: These are the thermostat setpoint and setback controls.'></span>
</td>
<td class='controls'>
<select size='1' name='cmbIDB' id='cmbIDB' onchange="checkForDefaults('cmbIDB'); recalcVentilation()">
<option>50</option><option>55</option><option>60</option><option>65</option><option>66</option>
<option>67</option><option>68</option><option>69</option><option>70</option><option>71</option>
<option>72</option><option>73</option><option>74</option><option selected>75</option><option>76</option>
<option>77</option><option>78</option><option>79</option><option>80</option><option>81</option>
<option>82</option><option>83</option><option>84</option><option>85</option><option>90</option>
<option>95</option>
</select><sup>o</sup>F
Setback
<select size='1' name='cmbIDB_SetBack' id='cmbIDB_SetBack' onchange="checkForDefaults('cmbIDB_SetBack')">
<option>1</option><option>2</option><option>3</option><option>4</option><option selected>5</option>
<option>6</option><option>7</option><option>8</option><option>9</option><option>10</option>
<option>11</option><option>12</option><option>13</option><option>14</option><option>15</option>
<option>Cond. Off</option>
</select><sup>o</sup>F
</td>
<td class='def' colspan='1' id='tdIDB_default'>75 <sup>o</sup>F</td>
<td class='def' colspan='2' id='tdIDB_SetBack_default'>5 <sup>o</sup>F</td>
</tr>
<!-- Inside Rel. Humidity (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Inside Rel. Humidity (%) <span class='help-icon' onclick="OpenWindow('Indoor_Relative_Humidity');" title='Inside Rel. Humidity: Uncheck the "auto" control to specify a fixed inside relative humidity level.'></span>
</td>
<td class='controls'>
Auto<input checked type='checkbox' name='chkTrackOHR' onclick="checkForDefaults('chkTrackOHR');onChangeHandler('chkTrackOHR');" />
Fixed
<select size='1' name='cmbIRH' id='cmbIRH' disabled onchange="checkForDefaults('cmbIRH');onChangeHandler('cmbIRH')">
<option>30</option><option>35</option><option>40</option><option>45</option><option>50</option>
<option>55</option><option selected>60</option><option>65</option><option>70</option>
</select>
<input type='hidden' name='txtIRH_hidden' id='txtIRH_hidden' value='60' />
</td>
<td class='def' id='tdTrackOHR_default'>Auto</td>
<td class='def' colspan='2' id='tdIRH_default'>60%</td>
</tr>
<tr><td class='breakRow' colspan='5'></td></tr>
<!-- Total Capacity -->
<tr>
<td class='rowname'>
Total Capacity <span class='help-icon' onclick="OpenWindow('Total_Capacity');" title='Total Capacity: Select the ARI net cooling capacity of the equipment being used.'></span>
</td>
<td class='controls'>
<select size='1' name='cmbTotalCap' id='cmbTotalCap' onchange="onChangeHandler('cmbTotalCap')">
</select>kBtuh
<input type='hidden' name='txtTotalCap' id='txtTotalCap' value='84' />
<input type='hidden' name='txtManufacturer' value='generic' />
</td>
<td class='def' colspan='3' id='tdTotalCapacity_default'>84 kBtuh</td>
</tr>
<!-- Oversizing Factor -->
<tr>
<td class='rowname'>
Oversizing Factor <span class='help-icon' onclick="OpenWindow('Oversizing_Factor');" title='Oversizing Factor: Percent that capacity exceeds load at design conditions.'></span>
</td>
<td class='controls'>
<select size='1' name='cmbOversizePercent' id='cmbOversizePercent' onchange="checkForDefaults('cmbOversizePercent'); recalcVentilation()">
<option selected>0</option><option>5</option><option>10</option><option>15</option><option>20</option>
<option>25</option><option>30</option><option>35</option><option>40</option><option>45</option>
<option>50</option><option>55</option><option>60</option><option>65</option><option>70</option>
<option>75</option><option>80</option><option>85</option><option>90</option><option>95</option>
<option>100</option><option>150</option><option>200</option><option>250</option><option>300</option>
</select>%
</td>
<td class='def' colspan='3' id='tdOversizePercent_default'>0%</td>
</tr>
<!-- Ventilation Rate (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Ventilation Rate <span class='help-icon' onclick="OpenWindow('Ventilation_Rate');" title='Ventilation Rate: Specify in CFM or as a percent of the fan capacity. Remaining fan capacity (not used in ventilation) is available for use by the economizer.'></span>
</td>
<td class='controls'>
<input type='text' class='alignright' id='txtVentilationValue' name='txtVentilationValue' value='24' size='4' onchange="checkForDefaults('txtVentilationValue')" />
<select size='1' name='cmbVentilationUnits' id='cmbVentilationUnits' onchange="checkForDefaults('cmbVentilationUnits'); recalcVentilation()">
<option selected>% of Fan Cap.</option><option>CFM</option>
</select>
</td>
<td class='def' id='tdVentilationValue_default'>24</td>
<td class='def' colspan='2' id='tdVentilationUnits_default'>of Fan Cap</td>
</tr>
<!-- N for Fan Energy Calcs (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
N for Fan Energy Calcs <span class='help-icon' onclick="OpenWindow('N_Affinity');" title='N Affinity: Exponent value used in fan-affinity law calculations.'></span>
</td>
<td class='controls'>
<select size='1' name='cmbN_Affinity' id='cmbN_Affinity' onchange="checkForDefaults('cmbN_Affinity')">
<option>3.0</option><option>2.9</option><option>2.8</option><option>2.7</option><option>2.6</option>
<option selected>2.5</option><option>2.4</option><option>2.3</option><option>2.2</option><option>2.1</option><option>2.0</option>
</select>
<input checked type='checkbox' style='display:none;' name='chkDOE2_Curves' />
</td>
<td class='def' colspan='3' id='tdN_Affinity_default'>2.5</td>
</tr>
<tr><td class='breakRow' colspan='5'></td></tr>
<!-- Candidate Unit -->
<tr>
<td class='rowname'>
Candidate Unit <span class='help-icon' onclick="OpenWindow('Candidate_Unit');" title='Candidate Unit: Energy Efficiency Ratio (EER), purchase and installation cost (k$), and annual maintenance costs ($/yr).'></span>
</td>
<td class='controls'>
<input class='alignright' style='width:25pt;' type='text' name='txtEER' id='txtEER' value='12' size='1' maxlength='5' onchange="checkForDefaults('txtEER');onChangeHandler('txtEER')" />EER @
<input class='alignright' style='width:30pt;' type='text' name='txtUnitCost' id='txtUnitCost' value='4.5' size='1' maxlength='5' onchange="checkForDefaults('txtUnitCost')" />k$
<input class='alignright' style='width:25pt;' type='text' name='txtMaintenance_Candidate' id='txtMaintenance_Candidate' value='0' size='1' maxlength='5' onchange="checkForDefaults('txtMaintenance_Candidate')" />$/yr
</td>
<td class='def' id='tdEER_default'>12 EER</td>
<td class='def' id='tdUnitCost_default'>$4,500</td>
<td class='def' id='tdMaintenance_Candidate_default'>$0</td>
</tr>
<!-- Specific Candidate Unit (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Specific Candidate Unit <span class='help-icon' onclick="OpenWindow('Specific_RTU');" title='Specific RTU: Select from a list of three specific high-performance RTU systems.'></span>
</td>
<td class='controls' style='background:#E5E5E5'>
<select size='1' name='cmbSpecific_RTU_C' id='cmbSpecific_RTU_C' onchange="checkForDefaults('cmbSpecific_RTU_C');onChangeHandler('cmbSpecific_RTU_C')">
<option selected>None</option><option>Advanced Controls</option><option>Variable-Speed Compressor</option><option>Three Stages</option>
</select>
</td>
<td class='def' colspan='3' id='tdSpecific_RTU_C_default'>None</td>
</tr>
<!-- Enable Economizer (Candidate) -->
<tr>
<td class='rowname'>
Enable Economizer <span class='help-icon' onclick="OpenWindow('Economizer');" title='Economizer: Allows economizer to assist in meeting loads.'></span>
</td>
<td class='controls'>
<input checked type='checkbox' name='chkEconomizer_C' onclick="checkForDefaults('chkEconomizer_C')" />
</td>
<td class='def' colspan='3' id='tdEconomizer_C_default'>Economizer enabled</td>
</tr>
<!-- Power Inputs - Candidate (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Power Inputs (kW) <span class='help-icon' onclick="OpenWindow('FanCondAux');" title='Power Inputs: Specification of all the power inputs at ARI rating conditions (in kWatts): EFn (evaporator fan), Aux (auxiliary), Cnd (condenser).'></span>
</td>
<td class='controls'>
<input class='alignright' style='width:25pt;' type='text' name='txtBFn_kw_C' id='txtBFn_kw_C' value='' size='1' maxlength='5' onchange="checkForDefaults('txtBFn_kw_C');onChangeHandler('txtBFn_kw_C');" />EFn
<input class='alignright' style='width:25pt;' type='text' name='txtAux_kw_C' id='txtAux_kw_C' value='' size='1' maxlength='5' onchange="checkForDefaults('txtAux_kw_C');onChangeHandler('txtAux_kw_C');" />Aux
<input class='alignright' style='width:30pt;' type='text' name='txtCond_kw_C' id='txtCond_kw_C' value='' size='1' maxlength='6' onchange="checkForDefaults('txtCond_kw_C');onChangeHandler('txtCond_kw_C');" />Cnd
</td>
<td class='def' id='tdBFn_kw_C_default'></td>
<td class='def' id='tdAux_kw_C_default'></td>
<td class='def' id='tdCond_kw_C_default'></td>
</tr>
<!-- Condenser Fan - Candidate (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Condenser Fan <span class='help-icon' onclick="OpenWindow('Condenser_Fan');" title='Condenser Fan: Condenser-fan power as a percentage of the total condenser power (at ARI rating conditions).'></span>
</td>
<td class='controls'>
<input type='text' class='alignright' name='txtCondFanPercent_C' id='txtCondFanPercent_C' value='9.0' style='width:2.5em;' size='3' maxlength='5' onchange="checkForDefaults('txtCondFanPercent_C');onChangeHandler('txtCondFanPercent_C');" disabled />%
<input type='hidden' name='txtCondFanPercent_C_hidden' id='txtCondFanPercent_C_hidden' value='9.0' />
</td>
<td class='def' colspan='3' id='tdCondFanPercent_C'>9.0 %</td>
</tr>
<!-- Degradation Factor - Candidate (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Degradation Factor <span class='help-icon' onclick="OpenWindow('DegradationFactor');" title='Degradation Factor: Partload degradation factor (percent).'></span>
</td>
<td class='controls' id='tdPLDegrFactor_C_control'>
<select size='1' name='cmbPLDegrFactor_C' id='cmbPLDegrFactor_C' onchange="checkForDefaults('cmbPLDegrFactor_C');onChangeHandler('cmbPLDegrFactor_C')">
</select>
<input type='hidden' name='txtPLDegrFactor_C' id='txtPLDegrFactor_C' value='25' />
</td>
<td class='def' colspan='3' id='tdPLDegrFactor_C_default'>25</td>
</tr>
<!-- Number of Stages - Candidate (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Number of Stages <span class='help-icon' onclick="OpenWindow('N_stages');" title='Number of Stages: The number of stages (capacity levels) in the RTU.'></span>
</td>
<td class='controls'>
<select size='1' name='cmbNstages_C' id='cmbNstages_C' onchange="checkForDefaults('cmbNstages_C');onChangeHandler('cmbNstages_C')">
<option selected>1</option><option>2</option><option>3</option><option>5</option><option>10</option>
</select>
<input type='hidden' name='txtNstages_C' value='1' size='1' />
</td>
<td class='def' colspan='3' id='tdNStages_default_C'>1</td>
</tr>
<!-- E-Fan and Condenser - Candidate (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
E-Fan and Condenser <span class='help-icon' onclick="OpenWindow('FanControls');" title='E-Fan and Condenser: Characteristics of the evaporator fan and the condenser.'></span>
</td>
<td class='controls'>
<select size='1' name='cmbFanControls_C' id='cmbFanControls_C' style='max-width:150px' onchange="checkForDefaults('cmbFanControls_C');onChangeHandler('cmbFanControls_C')">
<option selected>1-Spd: Always ON</option><option>1-Spd: Cycles With Compressor</option><option>N-Spd: Always ON</option><option>N-Spd: Cycles With Compressor</option><option>V-Spd: Always ON</option>
</select>
</td>
<td class='def' colspan='3' id='tdFanControls_C_default'>1-Spd: Always ON</td>
</tr>
<!-- S/T Ratio - Candidate (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
S/T Ratio <span class='help-icon' onclick="OpenWindow('StoT_Ratio');" title='S/T Ratio: Ratio of sensible to total capacity at ARI test conditions.'></span>
</td>
<td class='controls' id='tdST_Ratio_C_control'>
<select size='1' name='cmbST_Ratio_C' id='cmbST_Ratio_C' onchange="checkForDefaults('cmbST_Ratio_C');onChangeHandler('cmbST_Ratio_C')">
<option>0.70</option><option>0.71</option><option selected>0.72</option><option>0.73</option><option>0.74</option>
<option>0.75</option><option>0.76</option><option>0.77</option><option>0.78</option><option>0.79</option><option>0.80</option>
</select>
</td>
<td class='def' colspan='3' id='tdST_Ratio_default_C'>0.72</td>
</tr>
<!-- Spreadsheet Data - Candidate (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Spreadsheet Data <span class='help-icon' onclick="OpenWindow('SpreadsheetData');" title='Spreadsheet Data: Detailed performance data to be pasted from the specification spreadsheet.'></span>
</td>
<td class='controls'>
<textarea name='txtSpreadsheetData_C' id='txtSpreadsheetData_C' onchange="checkForDefaults('txtSpreadsheetData_C');onChangeHandler('txtSpreadsheetData_C')" oninput="checkForDefaults('txtSpreadsheetData_C');onChangeHandler('txtSpreadsheetData_C')" onblur="if(this.value===''){var w=document.getElementById('bpfWarningArea');if(w){w.innerHTML='';w.style.display='none';}}" cols='21' rows='1' style='height:1.3em; overflow-x:hidden;'></textarea>
<input type='checkbox' name='chkSpreadsheetControl_C' id='chkSpreadsheetControl_C' onclick="onChangeHandler('chkSpreadsheetControl_C');" />
</td>
<td class='def' colspan='3' id='tdSpreadsheetData_C_default'>blank</td>
</tr>
<tr><td class='breakRow' colspan='5'></td></tr>
<!-- Standard Unit -->
<tr>
<td class='rowname'>
Standard Unit <span class='help-icon' onclick="OpenWindow('Standard_Unit');" title='Standard Unit: Energy Efficiency Ratio (EER), purchase and installation cost (k$), and annual maintenance costs ($/yr).'></span>
</td>
<td class='controls'>
<input class='alignright' style='width:25pt;' type='text' name='txtEER_Standard' id='txtEER_Standard' value='9' size='1' maxlength='5' onchange="checkForDefaults('txtEER_Standard');onChangeHandler('txtEER_Standard')" />EER @
<input class='alignright' style='width:30pt;' type='text' name='txtUnitCost_Standard' id='txtUnitCost_Standard' value='4' size='1' maxlength='5' onchange="checkForDefaults('txtUnitCost_Standard')" />k$
<input class='alignright' style='width:25pt;' type='text' name='txtMaintenance_Standard' id='txtMaintenance_Standard' value='0' size='1' maxlength='6' onchange="checkForDefaults('txtMaintenance_Standard')" />$/yr
</td>
<td class='def' id='tdEER_Standard_default'>9 EER</td>
<td class='def' id='tdUnitCost_Standard_default'>$4,000</td>
<td class='def' id='tdMaintenance_Standard_default'>$0</td>
</tr>
<!-- Enable Economizer (Standard) -->
<tr>
<td class='rowname'>
Enable Economizer <span class='help-icon' onclick="OpenWindow('Economizer');" title='Economizer: Allows economizer to assist in meeting loads.'></span>
</td>
<td class='controls'>
<input checked type='checkbox' name='chkEconomizer_S' onclick="checkForDefaults('chkEconomizer_S')" />
</td>
<td class='def' colspan='3' id='tdEconomizer_S_default'>Economizer enabled</td>
</tr>
<!-- Power Inputs - Standard (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Power Inputs (kW) <span class='help-icon' onclick="OpenWindow('FanCondAux');" title='Power Inputs: Specification of all the power inputs in kWatts: EFn (evaporator fan), Aux (auxiliary), Cnd (condenser).'></span>
</td>
<td class='controls'>
<input class='alignright' style='width:25pt;' type='text' name='txtBFn_kw_S' id='txtBFn_kw_S' value='' size='1' maxlength='5' onchange="checkForDefaults('txtBFn_kw_S');onChangeHandler('txtBFn_kw_S');" />EFn
<input class='alignright' style='width:25pt;' type='text' name='txtAux_kw_S' id='txtAux_kw_S' value='' size='1' maxlength='5' onchange="checkForDefaults('txtAux_kw_S');onChangeHandler('txtAux_kw_S');" />Aux
<input class='alignright' style='width:30pt;' type='text' name='txtCond_kw_S' id='txtCond_kw_S' value='' size='1' maxlength='6' onchange="checkForDefaults('txtCond_kw_S');onChangeHandler('txtCond_kw_S');" />Cnd
</td>
<td class='def' id='tdBFn_kw_S_default'></td>
<td class='def' id='tdAux_kw_S_default'></td>
<td class='def' id='tdCond_kw_S_default'></td>
</tr>
<!-- Condenser Fan - Standard (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Condenser Fan <span class='help-icon' onclick="OpenWindow('Condenser_Fan');" title='Condenser Fan: Condenser-fan power as a percentage of the total condenser power (at ARI rating conditions).'></span>
</td>
<td class='controls'>
<input type='text' class='alignright' name='txtCondFanPercent_S' id='txtCondFanPercent_S' value='9.0' style='width:2.5em;' size='3' maxlength='5' onchange="checkForDefaults('txtCondFanPercent_S');onChangeHandler('txtCondFanPercent_S');" disabled />%
<input type='hidden' name='txtCondFanPercent_S_hidden' id='txtCondFanPercent_S_hidden' value='9.0' />
</td>
<td class='def' colspan='3' id='tdCondFanPercent_S'>9.0 %</td>
</tr>
<!-- Degradation Factor - Standard (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Degradation Factor <span class='help-icon' onclick="OpenWindow('DegradationFactor');"
title='Degradation Factor: Partload degradation factor (percent).'></span>
</td>
<td class='controls' id='tdPLDegrFactor_S_control'>
<select size='1' name='cmbPLDegrFactor_S' id='cmbPLDegrFactor_S' onchange="checkForDefaults('cmbPLDegrFactor_S');onChangeHandler('cmbPLDegrFactor_S')">
</select>
<input type='hidden' name='txtPLDegrFactor_S' id='txtPLDegrFactor_S' value='25' />
</td>
<td class='def' colspan='3' id='tdPLDegrFactor_S_default'>25</td>
</tr>
<!-- Number of Stages - Standard (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Number of Stages <span class='help-icon' onclick="OpenWindow('N_stages');" title='Number of Stages: The number of stages (capacity levels) in the RTU.'></span>
</td>
<td class='controls'>
<select size='1' name='cmbNstages_S' id='cmbNstages_S' onchange="checkForDefaults('cmbNstages_S');onChangeHandler('cmbNstages_S')">
<option selected>1</option><option>2</option><option>3</option><option>5</option><option>10</option>
</select>
<input type='hidden' name='txtNstages_S' value='1' size='1' />
</td>
<td class='def' colspan='3' id='tdNStages_default_S'>1</td>
</tr>
<!-- E-Fan and Condenser - Standard (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
E-Fan and Condenser <span class='help-icon' onclick="OpenWindow('FanControls');" title='E-Fan and Condenser: Characteristics of the evaporator fan and condenser.'></span>
</td>
<td class='controls'>
<select size='1' name='cmbFanControls_S' id='cmbFanControls_S' style='max-width:150px' onchange="checkForDefaults('cmbFanControls_S');onChangeHandler('cmbFanControls_S')">
<option selected>1-Spd: Always ON</option><option>1-Spd: Cycles With Compressor</option><option>N-Spd: Always ON</option><option>N-Spd: Cycles With Compressor</option><option>V-Spd: Always ON</option>
</select>
</td>
<td class='def' colspan='3' id='tdFanControls_S_default'>1-Spd: Always ON</td>
</tr>
<!-- S/T Ratio - Standard (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
S/T Ratio <span class='help-icon' onclick="OpenWindow('StoT_Ratio');" title='S/T Ratio: Ratio of sensible to total capacity at ARI test conditions.'></span>
</td>
<td class='controls' id='tdST_Ratio_S_control'>
<select size='1' name='cmbST_Ratio_S' id='cmbST_Ratio_S' onchange="checkForDefaults('cmbST_Ratio_S');onChangeHandler('cmbST_Ratio_S')">
<option>0.70</option><option>0.71</option><option selected>0.72</option><option>0.73</option><option>0.74</option>
<option>0.75</option><option>0.76</option><option>0.77</option><option>0.78</option><option>0.79</option><option>0.80</option>
</select>
</td>
<td class='def' colspan='3' id='tdST_Ratio_default_S'>0.72</td>
</tr>
<!-- Spreadsheet Data - Standard (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Spreadsheet Data <span class='help-icon' onclick="OpenWindow('SpreadsheetData');" title='Spreadsheet Data: Detailed performance data to be pasted from the specification spreadsheet.'></span>
</td>
<td class='controls'>
<textarea name='txtSpreadsheetData_S' id='txtSpreadsheetData_S' onchange="checkForDefaults('txtSpreadsheetData_S');onChangeHandler('txtSpreadsheetData_S')" oninput="checkForDefaults('txtSpreadsheetData_S');onChangeHandler('txtSpreadsheetData_S')" onblur="if(this.value===''){var w=document.getElementById('bpfWarningArea');if(w){w.innerHTML='';w.style.display='none';}}" cols='21' rows='1' style='height:1.3em; overflow-x:hidden;'></textarea>
<input type='checkbox' name='chkSpreadsheetControl_S' id='chkSpreadsheetControl_S' onclick="onChangeHandler('chkSpreadsheetControl_S');" />
</td>
<td class='def' colspan='3' id='tdSpreadsheetData_S_default'>blank</td>
</tr>
<tr><td class='breakRow' colspan='5'></td></tr>
<!-- Electric Utility Rate -->
<tr>
<td class='rowname'>
Electric Utility Rate <span class='help-icon' onclick="OpenWindow('Electric_Utility_Rate');" title='Electric Utility Rate: Enter your local electric rate.'></span>
</td>
<td class='controls'>
<input type='text' class='alignright' name='txtElectricityRate' id='txtElectricityRate' value='0.08' style='width:30pt;' size='3' maxlength='6' onchange="checkForDefaults('txtElectricityRate')" />$/kWhrs
</td>
<td class='def' colspan='3' id='tdElectricityRate_default'>0.08 $/kWhrs</td>
</tr>
<!-- Demand (Advanced) -->
<tr class='advancedRow' style='display:none'>
<td class='AdvancedControls'>
Demand <span class='help-icon' onclick="OpenWindow('Demand');" title='Demand: Monthly demand rate ($/kW) and the number of months that this rate applies.'></span>
</td>
<td class='controls'>
<select size='1' name='cmbDemandMonths' id='cmbDemandMonths' onchange="checkForDefaults('cmbDemandMonths')">
<option selected>0</option><option>1</option><option>2</option><option>3</option><option>4</option><option>5</option><option>6</option>
<option>7</option><option>8</option><option>9</option><option>10</option><option>11</option><option>12</option>
</select>Months
<input class='alignright' style='width:35pt;' type='text' name='txtDemandCostPerKW' id='txtDemandCostPerKW' value='0' onchange="checkForDefaults('txtDemandCostPerKW');" />$/kW
</td>
<td class='def' colspan='1' id='tdDemandMonths_default'>0 Months</td>
<td class='def' colspan='2' id='tdDemandCostPerKW_default'>0 $/kW</td>
</tr>
<!-- Equipment Life -->
<tr>
<td class='rowname'>
Equipment Life <span class='help-icon' onclick="OpenWindow('Equipment_Life');" title='Equipment Life: Number of years of life before equipment is replaced.'></span>
</td>
<td class='controls'>
<select size='1' name='cmbEquipmentLife' id='cmbEquipmentLife' onchange="checkForDefaults('cmbEquipmentLife')">
<option>10</option><option selected>15</option><option>20</option><option>25</option><option>30</option>
</select>years
</td>
<td class='def' colspan='3' id='tdEquipmentLife_default'>15 years</td>
</tr>
<!-- Number of Units -->
<tr>
<td class='rowname'>
Number of Units <span class='help-icon' onclick="OpenWindow('Number_of_Units');" title='Number of Units: This is a simple multiplication factor used in calculating costs for a group of units.'></span>
</td>
<td class='controls'>
<input type='text' class='alignright' name='txtNUnits' id='txtNUnits' value='1' style='width:30pt;' size='3' maxlength='3' onchange="checkForDefaults('txtNUnits')" />units
</td>
<td class='def' colspan='3' id='tdNUnits_default'>1 unit</td>
</tr>
<!-- Chart discounted costs / Discount Rate -->
<tr>
<td class='RevisionHistory'><a class='Jump' target='_blank' title="the calculator's revision history" href='RevisionHistory.html'>Version 6.0</a></td>
<td class='rowname'>
Chart discounted costs <span class='help-icon' onclick="OpenWindow('Chart_present_value');" title='Discounted Costs: If checked, discounted purchase and operating costs are calculated (the present value).'></span>
</td>
<td class='controls'>
<input checked type='checkbox' name='chkChartPW' id='chkChartPW' onclick="checkForDefaults('chkChartPW'); onChangeHandler('chkChartPW');" />
Discount Rate
<input type='text' class='alignright' name='txtDiscountRate' id='txtDiscountRate' value='7' style='width:30pt;' size='3' maxlength='5' onchange="checkForDefaults('txtDiscountRate'); onChangeHandler('txtDiscountRate');" />%
<input type='hidden' name='txtDiscountRate_hidden' id='txtDiscountRate_hidden' value='7'>
</td>
<td class='def' colspan='2' id='tdChartPW_default'>Discounted</td>
<td class='def' colspan='1' id='tdDiscountRate_default'>7.0 %</td>
</tr>
<!-- Bottom buttons -->
<tr>
<td class='headers col1'></td>
<td class='headers col2'>
<input type='button' style='width:50pt;' value='Reload' onclick='Reload_engine()' />
</td>
<td class='headers col3'>
<input type='button' style='width:50pt;' value='Submit' onclick='submitToEngine();' />
</td>
<td class='headers col4' colspan='3'>
<input type='button' style='width:50pt;' value='Restore' onclick='restoreDefaults();' />
<input type='button' class='bmAdvanced' style='width:50pt; display:none;' value='Power' onclick='resetPowerDefaults();' />
</td>
</tr>
</form>
</table>
</div><!-- end controlsView -->
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<!-- RESULTS VIEW (hidden initially) -->
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<div id="resultsView" style="display:none;">
<span class='homeLink_left'><a class='Jump' href='javascript:returnToControls()'>Return to Controls Page</a></span>
<span class='float_center' id='binChartsToggleLink' style='display:none;'><a class='Jump' id='binChartsToggleAnchor' href='javascript:toggleBinChartsGrid()'>Show side-by-side charts</a></span>
<span class='homeLink'><a class='Jump' href='javascript:restoreDefaults()' title='RESET: Return to the controls page with defaults.'>Reset the Calculator</a></span>
<br>
<div id="resultsContent">
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</div>
</div><!-- end resultsView -->
<!-- ============================================================ -->
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<script defer src="controls.js"></script>
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<div id="subBanner" style="width: 940px; height: 18px; display: flex; overflow: hidden; border-radius: 0px 0px 7px 7px;">
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<span style="color: white; font-size: 22px; font-weight:500; font-family: Arial, sans-serif;"></span>
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