CDAE 170 Solar Building Strategies Class #11 Nov. 17, 2003 Gary Flomenhoft BSME, MAPP, CEE Research Associate Gund Institute, SNR
Developing world renewable energy Developing world renewable energy workshops
SOLAR HOT WATER SYSTEMS
Collectors-POOL
Collectors-Flat Plate
Collectors-Evacuated tube
Passive Batch Heater
Passive Thermosyphon
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
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.
Freeze Protection-Drainback
Drainback
Drainback system
Freeze Protection-Closed Loop
External heat exchanger W/solar tank
External heat exchanger and expansion tank
External heat exchanger
Heat and Hot Water
Wood backup
Installation