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Rick H Parker

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Reply with quote  #161 
I built mine to provide 100%, but in the summer I have a problem with the excess heat, hence the bypass.

Your using the same pump for circulation and pumping the collector?

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist

stmbtwle

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Reply with quote  #162 
I have two pumps; a pump(1) which circulates from the collector through the tub, and a second pump(2) which circulates from the collector through the bypass loop.  In normal operation pump 1 is running.  When the tub reaches set temp 103F the pump shuts off and the collector stagnates.  When the collector reaches 140 pump 2 comes on and pumps the water through the bypass (100' of irrigation tubing along the east side of the house) thus keeping the collector from overheating. There are a couple of brass "clapper" valves to prevent backflow. I posted a diagram somewhere.

I could have done the same thing with one pump and a motorized 3-way valve, but it would have entailed replumbing the system and moving pump (1).  This system is an add-on and required minimal mods. The cost would have been about the same either way.  It has worked great ever since installation.

It's controlled by an Arduino, but I could have used snap-disk switches along with the adjustable thermostat in the tub.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #163 
the bypass (100' of irrigation tubing along the east side of the house) thus keeping the collector from overheating.

If I got it visualized correctly, you have two separate circuit connected to your collector. On circuit one the load is the hot tub. On circuit two the load is a thermal dump load.
What your calling a bypass, I call a diversion circuit, it diverts the excess to a second load.


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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #164 
Call it what you will.  I bypassed the hot tub.  It works.  There are other ways to skin a cat.


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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
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