Direct Digital Control Energy Savings--Calculation Tool
Direct Digital Control Energy Savings--Calculation Tool
Direct Digital Control Energy Savings--Calculation Tool
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<strong>Direct</strong> <strong>Digital</strong> <strong>Control</strong> <strong>Energy</strong><br />
<strong>Savings</strong> <strong>Calculation</strong> <strong>Tool</strong><br />
US Army Corps<br />
of Engineers<br />
David Underwood<br />
Engineer Research and Development Center
Background<br />
• Guideline produced for Navy 1982<br />
• Standardized engineering savings calculations<br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
Systems and<br />
Applications<br />
• 29 Systems<br />
• 16 Applications<br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
Use in <strong>Energy</strong> Audits:<br />
Justify Outdated <strong>Control</strong>s<br />
Replacement<br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
<strong>Control</strong>s & Base Wide Monitoring<br />
Problem:<br />
No or minimal HVAC<br />
controls in many<br />
buildings<br />
Router<br />
Ethernet channel<br />
Gateway<br />
Solution:<br />
• Install DDC <strong>Control</strong>s and Re-<br />
Commission<br />
• Schedule AHUs to match<br />
building occupancy<br />
• Install Central Operator<br />
Workstation (OWS) in DPW<br />
• Implement Night and<br />
weekend temperature<br />
setback<br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
What Is It?<br />
Spreadsheet That Calculates<br />
<strong>Energy</strong> <strong>Savings</strong> For 16<br />
Applications<br />
• Scheduled Start/stop<br />
• Duty Cycling<br />
• Demand Limiting<br />
• Optimum start/Stop<br />
• Outside Air Limit Shutoff<br />
• Ventilation And Recirculation<br />
• Economizer (Dry Bulb or<br />
Enthalpy)<br />
• Day/Night Setback<br />
• Reheat Coil Reset<br />
• Hot Deck/Cold Deck<br />
Temperature Reset<br />
• Hot Water Outside Air Reset<br />
• Boiler Optimization<br />
• Chiller Optimization<br />
• Chiller Water Temperature<br />
Reset<br />
• Condenser Water Temperature<br />
Reset<br />
• Chiller Demand Limit<br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
How Do I Use It<br />
• Enter Weather Data<br />
• Choose Strategies to Implement<br />
• Enter Building Data<br />
– Building Characteristics<br />
– Primary Systems<br />
– Secondary Systems<br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
Enter Weather Data<br />
US Army Corps<br />
of Engineers<br />
http://notus2.afccc.mil/scis/<br />
Engineer Research and Development Center
Weather Factor Calcs<br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
Building Information<br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
Building Information<br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
Selecting Applications<br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
Enter Mechanical System<br />
Information<br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
Example <strong>Calculation</strong><br />
Hot Water Reset<br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
<strong>Savings</strong><br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
<strong>Savings</strong><br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
<strong>Savings</strong> Summary<br />
US Army Corps<br />
of Engineers<br />
Engineer Research and Development Center
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