Presentation on theme: "Why Save Energy z Lower Overhead z Improve property value z Increase Rents z Decrease your environmental footprint."— Presentation transcript:
Why Save Energy z Lower Overhead z Improve property value z Increase Rents z 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 Coal Power Plan Waste Heat Line Losses Transmission Lines Motors Pump Losses Drive Train Losses Throttle Losses Pipe Losses Magnetic and Resistive Losses Usable Work 9.5% Of Coal Energy * * Carbon Dioxide (global warming gas) * Oxides of Sulfur and Nitrogen * Mercury compounds From Destructive Mining Practices
1. Determine Energy Demand z Begin by analyzing utility bills to determine yHow much energy you consume yWhen you consume it yHow much of your utility costs are for base usage and how much is for peak demand. Community Pool Food Wholesaler
2. Determine How Electricity is Used Example Data were taken from: z Load nameplate readings z Operating times z Actual usage not feasible as pool was not in use during study period z Focus effort on top loads
3. Recommend Methods to Lower Energy Use zIdentify opportunities to save zDetermine cost of installing improvements zDetermine the benefit for each change zIdentify the payback interval and / or property value improvement.
4. Implement Energy Savings Skylights zAvoid the need for electric lights 75% of the time. zNatural lighting is more pleasant More efficient Lights z Reduce energy use z Last longer z Better color balance NewOld
Solar Water Heating zTried and true technology - has been used for decades zFar less costly than solar electric installations zPotential for significant governmental grants and tax benefits
Components of Solar Hot Water Heaters zSolar collectors on roof zHeat exchanger zHot water storage tank zController zPump zPipes and wiring to interconnect the system
Schematic Diagram of System With Data Logging Reis, R. Fine-Tuning a Solar Water-Heating System, Solar Today, April 2009 http://solartoday.org/waterheating/
Investment Analysis Example for Solar Hot Water System Small apartment house example Payback intervals are about 4 times longer for solar electric.
Importance of Commissioning System Installed A B Issues Resolved
My early 80s Hot Water Solar System (still working) 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. Collectors Conventional Hot Water Tank Hot Water Storage Tank Heat Exchanger Tank Pumps