1. CDAE 170 Solar Building Strategies Class #11 Nov. 17, 2003 Gary Flomenhoft BSME, MAPP, CEE Research Associate Gund Institute, SNR

2. Developing world renewable energy Developing world renewable energy workshops

3. SOLAR HOT WATER SYSTEMS

4. Collectors-POOL

6. Collectors-Flat Plate

8. Collectors-Evacuated tube

10. Passive Batch Heater

11. Passive Thermosyphon

13. Freeze Protection-Draindown Solar Collector 6. Collector Return Breaker 11. Tank Drain 2. Vent/Vacuum 7. Collector Supply 12. Tank Drain Fitting 3. Hot Water to Taps 8. Drain Down Valve 13. DHW Electric Tank 4. Cold Feed 9. Circulating Pump 14. Immersion Heater 5. Tempering Valve 10. Drain

14. Freeze Protection-Draindown The Sunspool draindown valve was popularly installed in the 1980's, but is no longer manufactured. Draindown systems have proven to be the most problematic of all freeze protection systems. They are vulnerable to frozen vacuum breakers and air vents, damaged sensors or wiring, lack of proper pipe drainage, and malfunctions with the draindown valve. This type of system is rarely installed new any more, and is not recommended.

15. Freeze Protection-Drainback

16. Drainback

18. Drainback system

19. Freeze Protection-Closed Loop

21. External heat exchanger W/solar tank

22. External heat exchanger and expansion tank

23. External heat exchanger

25. Heat and Hot Water

26. Wood backup

27. Installation