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Silverback

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Posts: 174
Reply with quote  #11 
Quote:
Originally Posted by SolarInterested
Quote:
Originally Posted by Silverback
Do people bother to pump systems in which the tank is above the collector or is the convection usually enough?

Don't know for sure but none of the systems shown on the B-I-S site have pumps:
http://www.builditsolar.com/Projects/WaterHeating/ThermosyphonDIY/ThermosyphonDIY.htm
http://www.builditsolar.com/Projects/WaterHeating/DougThermosyphon.htm
http://www.builditsolar.com/Projects/WaterHeating/CostaRicaThermosyphon/CostaRicaThermosyphon.htm
http://www.builditsolar.com/Projects/WaterHeating/FijiThermosyphon/FijiThermosyphon.htm
http://www.builditsolar.com/Projects/WaterHeating/PakistanSHW/PakistanSHW.htm

Gary's test systems also have no pump
http://www.builditsolar.com/Experimental/ThermosyphonTest/CopperCol.htm
http://www.builditsolar.com/Experimental/ThermosyphonTest/PEXCol.htm

If a pump was used the head required is almost zero so only a small pump would be needed.

Quote:
... Is the open tank likely to place too much pressure on the system? 

I guess one disadvantage of having the panel at the bottom of the system is that it sees the most head pressure in the system and it's constant as the system never drains.


Thanks for the legwork. I hadn't seen any pumps above either. 

I suppose the constant head pressure is a surefire way to check your systems for leaks.

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SolarInterested

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Reply with quote  #12 

There's a one year update for this thermosyphon system which also uses PVC piping in the collector

http://www.builditsolar.com/Projects/WaterHeating/CostaRicaThermosyphon/CostaRicaThermosyphon.htm#Update

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trendawareness

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Posts: 8
Reply with quote  #13 

I found this thread during a search. 

To follow-up, for a typical DIY thermosyphon system, what's the practical limit on the horizontal distance between the storage tank and the collector?

My house is situated on the side of a hill and I have full sun exposure, so I can easily locate my tank 2-3 ft above my planned collectors,  but approx. 15 - 20 feet away (horizontal distance).

Assuming the slopes are all positive and 1" pipe is used, should this be a workable distance for a thermosyphon system?

Thanks!

 

SolarInterested

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Reply with quote  #14 
shivaseegobin discussion about his Gravity Fed Solar Tube Water Heater system has been split off into a new topic:

http://simplysolar.supporttopics.com/post?id=9725143

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Both temperature rise and airflow are integral to comparing hot air collectors
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