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Why Save Energy

Why Save Energy. Lower Overhead Improve property value Increase Rents Decrease your environmental footprint. Saving Energy and Using Solar Hot Water Systems. Richard Reis, PE 301-325-8001 www.conservationengineering.com Sierra Club member since the 1960s. Energy Efficiency Problem. *.

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Why Save Energy

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  1. Why Save Energy • Lower Overhead • Improve property value • Increase Rents • Decrease your environmental footprint

  2. Saving Energy and Using Solar Hot Water Systems Richard Reis, PE 301-325-8001 www.conservationengineering.com Sierra Club member since the 1960s

  3. Energy Efficiency Problem * Motors Transmission Lines Coal Power Plan Usable Work 9.5% Of Coal Energy Line Losses Drive Train Losses Throttle Losses From Destructive Mining Practices Magnetic and Resistive Losses Pump Losses Pipe Losses Waste Heat * Carbon Dioxide (global warming gas) * Oxides of Sulfur and Nitrogen * Mercury compounds

  4. 1. Determine Energy Demand • Begin by analyzing utility bills to determine • How much energy you consume • When you consume it • How much of your utility costs are for base usage and how much is for peak demand. Community Pool Food Wholesaler

  5. 2. Determine How Electricity is Used Example Data were taken from: • Load nameplate readings • Operating times • Actual usage not feasible as pool was not in use during study period • Focus effort on top loads

  6. 3. Recommend Methods to Lower Energy Use • Identify opportunities to save • Determine cost of installing improvements • Determine the benefit for each change • Identify the payback interval and / or property value improvement.

  7. Skylights Avoid the need for electric lights 75% of the time. Natural lighting is more pleasant More efficient Lights Reduce energy use Last longer Better color balance New Old 4. Implement Energy Savings

  8. Solar Water Heating • Tried and true technology - has been used for decades • Far less costly than solar electric installations • Potential for significant governmental grants and tax benefits

  9. Components of Solar Hot Water Heaters • Solar collectors on roof • Heat exchanger • Hot water storage tank • Controller • Pump • Pipes and wiring to interconnect the system

  10. Schematic Diagram of System With Data Logging Reis, R. “Fine-Tuning a Solar Water-Heating System”, Solar Today, April 2009 http://solartoday.org/waterheating/

  11. Investment Analysis Example for Solar Hot Water System Small apartment house example Payback intervals are about 4 times longer for solar electric.

  12. Importance of Commissioning A System Installed B Issues Resolved

  13. My early 80s Hot Water Solar System (still working) Collectors Hot Water Storage Tank Newer System uses antifreeze to prevent winter freezing. This older system is a drain back system. The solar Fluid is just water which drains back to the small heat exchanger tank when the sun is not shining. Conventional Hot Water Tank Pumps Heat Exchanger Tank

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