1. Active Solar Water Heating For Home Hot Water By Clare Freeman and Laura Mitchell http://www.solardepot.com/r_solar_hot_water.htm

2. What is the main goal? To reduce our contribution To reduce our contribution to the greenhouse effect to the greenhouse effect It is clean and renewable: it’s a good step towards making our society self-sustaining It is clean and renewable: it’s a good step towards making our society self-sustaining Reduces dependence on Non-renewable energy sources like coal, natural gas, and oil. (especially foreign oil!) Reduces dependence on Non-renewable energy sources like coal, natural gas, and oil. (especially foreign oil!) Reduce SOx and NOx emissions and their contribution to acid rain Reduce SOx and NOx emissions and their contribution to acid rain http://www.linfordglass.com/perform/perform. php?PHPSESSID=8295964ef77b413805c62f8c 72cb5278

3. It will make a difference! About half of the earth’s carbon emissions come from building energy use, which solar water heating systems would reduce About half of the earth’s carbon emissions come from building energy use, which solar water heating systems would reduce A typical system provides between 50 and 75% of the water needed yearly A typical system provides between 50 and 75% of the water needed yearly They can last over 40 years if made well They can last over 40 years if made well

4. How would it help me personally? Save hundreds of dollars on water heating bills (over time) Save hundreds of dollars on water heating bills (over time) Hedge against increasing energy prices Hedge against increasing energy prices Gain satisfaction in Gain satisfaction in knowing you aren’t contributing as much to air pollution! www.johnryanart.com/artwork9.htm

5. Obstacles You must have a sunny location You must have a sunny location Installation costs are high Installation costs are high If you live in an area with a lot of earthquakes or hurricanes there may be a limit to the weight or type of equipment installed on your roof. If you live in an area with a lot of earthquakes or hurricanes there may be a limit to the weight or type of equipment installed on your roof. http://members.ld.infoseek.co.jp/h_takeec/Sunset_Saipan.jpg http://www.nutritionresearchcenter.org/healthupdate/uploaded_images/AlGoreSolarHome-745979.jpg

6. Obstacles continued Keep in mind, there will be cloudy days. You would need a backup. Keep in mind, there will be cloudy days. You would need a backup. Acidic water corrodes systems that circulate water Acidic water corrodes systems that circulate water They require parts that run on electricity They require parts that run on electricity Don’t work well in climates that experience freezing temperatures for long periods of time Don’t work well in climates that experience freezing temperatures for long periods of time

7. Also: Select systems that are tested and certified by the Solar Rating and Certification Corporation (SRCC). Select systems that are tested and certified by the Solar Rating and Certification Corporation (SRCC). There should be about 10-15 square feet of solar panels for each person that lives in the house There should be about 10-15 square feet of solar panels for each person that lives in the house

8. How it is installed: Solar panels are normally installed on the roof. Solar panels are normally installed on the roof. It is best to use them in places with as much sun as possible! It is best to use them in places with as much sun as possible! The collectors should face south at approximately 30 degrees. The collectors should face south at approximately 30 degrees. http://www.tjsradiantheat.com/viessmann/images/flat_plate_collector.jpg

9. Five parts: 1. Solar Panels 2. A storage tank 3. A circulation system to move a fluid between the collectors to a storage tank http://www.eere.energy.gov/consumer/images/active_closed_loop_solar_wa.gif

10. 4. Backup heating system for cloudy days 5. Control system to regulate the overall system operation http://www.solardepot.com/r_solar_hot_water.htm

11. Direct system The domestic hot water is circulated directly from the storage tank into the collectors. The domestic hot water is circulated directly from the storage tank into the collectors. There are two types of direct systems - draindown and recirculating. There are two types of direct systems - draindown and recirculating.

12. The Draindown System Has a valve that will take the water out of the collectors when the outdoor temperature reaches 38 degrees (water will not freeze and bust the pipes) Has a valve that will take the water out of the collectors when the outdoor temperature reaches 38 degrees (water will not freeze and bust the pipes)Drawbacks: The draindown valves can fail, causing the expensive solar collectors to break. This is not uncommon as the valves aren’t used constantly. The draindown valves can fail, causing the expensive solar collectors to break. This is not uncommon as the valves aren’t used constantly. Mineral deposits in the collectors can reduce their efficiency. Mineral deposits in the collectors can reduce their efficiency.

13. The Recirculating System Will pump heated water from the storage tank through the collectors when the temperature drops to 38 degrees Will pump heated water from the storage tank through the collectors when the temperature drops to 38 degrees : Drawbacks: Buildup is circulated from water heated from the storage tank Buildup is circulated from water heated from the storage tank A lot of energy is wasted with the cooling and heating of the water A lot of energy is wasted with the cooling and heating of the water

14. Indirect Systems Systems that use antifreeze fluids need to be inspected atleast every two years. Oil or refrigerant circulating fluids are sealed into the system and do not need to be maintained, although they are more expensive. Systems that use antifreeze fluids need to be inspected atleast every two years. Oil or refrigerant circulating fluids are sealed into the system and do not need to be maintained, although they are more expensive. http://www.eere.energy.gov/consumer/your_home/water_heatin g/index.cfm/mytopic=12850

15. The Drainback System Distilled water is the collector circulating fluid Distilled water is the collector circulating fluid The collectors only hold water when the pump is operating. They collectors won’t freeze at night or when the power goes out. The collectors only hold water when the pump is operating. They collectors won’t freeze at night or when the power goes out. This system is reliable and requires very little maintenance This system is reliable and requires very little maintenance

16. Drawbacks The collectors must be mounted higher than the drainback tank/heat exchanger. This might not be possible if the collectors are mounted on the ground. The collectors must be mounted higher than the drainback tank/heat exchanger. This might not be possible if the collectors are mounted on the ground. http://www.greenbuilder.com/sourcebook/HeatCool.html#ACTIVEDHW

17. In-floor radiant heating systems Hot water is sent through pipes under the floor and heats the space. Hot water is sent through pipes under the floor and heats the space. They are the most efficient They are the most efficient the annual cost is about 30-40% less, but they are more expensive to install. the annual cost is about 30-40% less, but they are more expensive to install. http://www.allaroundthehouse.com/lib.ghi.h4.htm

18. Cost Cost of installation is high ($1000- $3000 or more) although operating cost is low. Cost of installation is high ($1000- $3000 or more) although operating cost is low. http://www.motherearthnews.com/uploadedImages/arti cles/issues/1979-09-01/059-070-01pic.jpg http://www.motherearthnews.com/uploadedImages/arti cles/issues/1979-09-01/059-070-01pic.jpg

19. Negative environmental impacts Trees might have to be cut down if they are in the way of the sun Trees might have to be cut down if they are in the way of the sun http://3media.initialized.org/photos/2003-10-03/index_gall.html

20. Bibliography http://www.eere.energy.gov/de/solar_hot water.html http://www.eere.energy.gov/de/solar_hot water.html http://www.eere.energy.gov/de/solar_hot water.html http://www.eere.energy.gov/de/solar_hot water.html http://www.solardepot.com/r_solar_hot_w ater.htm http://www.solardepot.com/r_solar_hot_w ater.htm http://www.solardepot.com/r_solar_hot_w ater.htm http://www.solardepot.com/r_solar_hot_w ater.htm http://www.greenbuilder.com/sourcebook/ HeatCool.html#ACTIVEDHW http://www.greenbuilder.com/sourcebook/ HeatCool.html#ACTIVEDHW http://www.greenbuilder.com/sourcebook/ HeatCool.html#ACTIVEDHW http://www.greenbuilder.com/sourcebook/ HeatCool.html#ACTIVEDHW