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Pitt County Detention Center

Pitt County Detention Center. DHW - 36 collectors 1750 gallons storage. Drug Rehab Center. DHW - 48 collectors 2000 gallons storage. Durability. Homeless Shelter - Salisbury, NC. 25 year old system perfect working condition. New replacement system. Common Solar System Types.

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Pitt County Detention Center

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  1. Pitt County Detention Center DHW - 36 collectors 1750 gallons storage Drug Rehab Center DHW - 48 collectors 2000 gallons storage

  2. Durability Homeless Shelter - Salisbury, NC 25 year old system perfect working condition New replacement system

  3. Common Solar System Types System Design - How it works Two main designs in use today - Old & New (er)

  4. How it works Pressurized Glycol Systems • Start with • Collectors • Pressurized tank • Collector Side Exchanger • Pump Need a few more things

  5. How it works Pressurized Glycol Systems 1 3 5 • Air Vent • Expansion Tank • PRV & Drain • Check Valve • Heat Dump • 3-Way Valve • Fan-Coil Unit • Pump & Control 4 Power failure will defeat overtemp protection 2

  6. How it works Non-pressurized Drainback System • Start with • Collectors • Non-Pressurized tank • Load Side Exchanger • Pump Power failure is normal operating mode

  7. Applications Residential DHW

  8. Applications Residential DHW

  9. Applications Residential SH - Forced Air Furnace Blower • Any Furnace Type • Gas • Oil • Heat Pump with • Electric Backup

  10. Applications Residential SH - Forced Air Furnace Solar Coil Blower • Three operational modes • Solar Only (hot) • Solar Assist (med) • Solar Cut Out (cold) Specify Coil for Low Temp Delivery

  11. Applications Residential SH - Room Heater

  12. Applications Residential SH - Radiant Slab Boiler Boiler Pump Boiler Pump is Circulator

  13. Applications Residential SH - Radiant Slab • Three operational modes • Solar Only (hot) • Solar Assist (med) • Solar Cut Out (cold) Boiler Boiler Pump Design System for Low Temp Delivery Solar Solar Pump Boiler Pump is Circulator Solar Connection referred to as “Side Arm”

  14. Applications Residential SH - Radiant Slab • Three operational modes • Solar Only (hot) • Solar Assist (med) • Solar Cut Out (cold) Boiler Boiler Pump Design System for Low Temp Delivery Solar Solar Pump Loop Pump is Circulator Solar & Boiler Connections are “Side Arm”

  15. Applications Commercial DHW

  16. Applications Commercial DHW

  17. Applications Commercial Space Heating Forced Air Radiant Slab

  18. Applications Commercial Space Heating Forced Air Radiant Slab Design for Low Temp Delivery

  19. Applications Pool Heating

  20. Applications Pool Heating

  21. Solar Analysis Methods A Quick Review 1. Load Estimation • Monthly Hot Water Loads = MBtu/mo • Usually from GPD x Occupants x dT rise • Ground water temp can be problem • Duty cycle - monthly variations • Dorm, Beach/Mountain Business, Hotel • Result is table of Monthly Energy Loads • Not capacity.

  22. 2. Energy Data (the fuel) • NASA Satellite data covers the whole earth. Use Lat. & Long. • Solar Radiation - Btu/ft2 on flat surface • Must tilt radiation data to chosen angle & south azimuth • Ground water temp calculated from ambient temp. 3. Choose Solar Collector (the boiler) • Peformance specs come from certified tests • Listed with SRCC • Only gain is radiation. Choose number. • Losses are radiation, convection, and conduction • Performance is straight line equation. Downward slope indicates lower efficiency as dT increases.

  23. 3. Choose Solar Storage (the battery) • Based on collector area • Can fudge with daylight load • 4. Put all the inputs into computer program (the brain) • Result is • monthly calculated loads for SH & HW • monthly solar energy produced • monthly solar fraction • monthly ouput per collector • Annual totals at the bottom

  24. 1 2 3 The F-Chart Program 4 Retscreen is free version 5 6 7 8

  25. Program Results Printout

  26. Results

  27. Economics - the simple version • Current and future cost of energy - First Order Estimates • Example: Solar output = 8 MBtu/collector • Installed cost/coll = $4500 • System lifetime = 20 years • Results: Lifetime energy = 160MBtu/coll • Result: Simple Energy Cost over Lifetime = $28.125/ MBtu • = $0.09/kWh • Compare with existing fuel cost of gas, oil, electric (÷ by efficiency) • e.g. 80% efficiency = 1.25X fuel cost • 65% efficiency = 1.53X fuel cost • Need threshold energy value for go ahead.

  28. Q & A Contact Info Ben Gravely, President Holocene Technologies 1241 Wicker Drive Raleigh, NC 27604 Cell: 919-818-1879 Email: ben.gravely@holocene-energy.com Blog: www.solarhotwater-systems.com

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