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Rick H Parker

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Reply with quote  #21 
Willie: Taking it to congress would be futile. The current majority has already demonstrated that.


Greg: Take care you might get hooked on CLESS (Controlled (or closed) Ecological Life Support Systems).


Rick H Parker




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Rick H Parker
Kansas, USA
Electronics Engineering Technologist

stmbtwle

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Reply with quote  #22 
Greg it might work!

Rick I'm afraid you're right. Even if you could PROVE it, they'd still deny it.

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Willie, Tampa Bay
sundug

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Reply with quote  #23 
My first attempt at a solar spa heater was a 300' coil of 1/2" irrigation tubing on my 45* south facing roof slope. I tried to power it with a 20 watt PV panel driving a 12volt pump. When I first filled it with the garden hose, it worked until I ran the spa, the bubbles injected into the spa put air into the coil, and air bound it so the pump would not circulate-too much power required to push water up hill in all those loops. So next I tried this- 
http://simplysolar.supporttopics.com/post/new-evacuated-tube-spa-swh-7477891?pid=1287698130
It was too small to heat the 250 gallon tub during the winter,and I had problems with overheating and freezing. I am now on my third design, totally different and I'll update that page when I get a chance. Sundug
http://www.builditsolar.com/Projects/SolarHomes/Doug/DougsProjects.htm

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stmbtwle

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Reply with quote  #24 
I use a small ARETHA for my hot tub. The first was a cinefoil dual pass with a two-stage heat exchanger and controlled by an arduino. It worked VERY well, but after a couple years the chlorine in the water got to the aluminum HEX and it died. My current ARETHA experiment is a screen zero-pass with a single stage copper-tube HVAC HEX. It doesn't seem to work as well the old one, but I believe it will be adequate for the job. Once it's finished I'll move it to the roof and make a cpvc HEX to go in the tub, and that should eliminate any corrosion worries.

So far I've not had any overheat issues with any of my ARETHAS, even when stagnated. The HEX being all metal can take the heat, and I always locate the fans in the lower part of the collector.

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Willie, Tampa Bay
Tori

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Reply with quote  #25 
Man,  i am clearly a newb,  as i only understood about every other 3rd word of that last post.   So many questions on terminology i don't even know where to start.   LOL
gbwillson

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Reply with quote  #26 
Too Funny Tori!

We DO tend to use a few solar tech terms , abbreviations and acronyms, don't we...

A glossary has been talked about from time to time. But until then, post a list of ANY of the words and phrases you don't know or completely understand and we will do our best to fill in your answers. So don't be afraid to ask a lot of questions, and in a short time you will be spewing out the "solar lingo" yourself. 

Greg in MN




Tori

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Reply with quote  #27 
[smile]  Thanks Greg,  i was hoping you'all would see the humor in my post and not take it too seriously.    Okay....... where to start.

small ARETHA
cinefoil
dual pass
aluminum HEX
screen zero-pass
single stage copper-tube HVAC HEX
cpvc HEX

That out to get me started ......  LOL
Rick H Parker

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Reply with quote  #28 

ARETHA = AiR Exchange THermal Assembly.

HEX = Heat Exchanger.

HVAC HEX = Heating Ventilation & Air Conditioning Heat Exchanger.

CPVC HEX = Chlorinated PolyVinyl Chloride Heat Exchanger.


Cinefoil is a matte black aluminum material that virtually soaks up light, developed for photography to control lighting, The function of a solar asorber is to soaks up light and convert it to heat. Which is what Cinefoil does.

 

Screen collector, a solar collector with a black screen(s) as the asorber.

Single pass, the air passes through one screen.

Dual pass, the air passes through two screens.

Zero pass, the air flows between but not through the screens, at least that is the goal. Zero passthrough would be a more descriptive term. Perhaps it was shorten to Zero Pass to save seven keystrokes. It has been shorted to ZP.


Rick H Parker


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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #29 
ARETHA is a type of solar collector which uses hot air to heat water. Cinefoil is a black aluminum foil used by the theater industry, it makes a good solar heat absorber, too. Dual pass refers to an air flow pattern in which the air flows out and back, usually on both sides of the heat absorber, picking up heat from both sides. HEX is short for heat exchanger, your car radiator, heater, and oil cooler are all heat exchangers. Most of those are also aluminum. Screen zero pass is a type of hot-air collector which uses window screen for a heat absorber. The air passes between the layers of screen rather than through them. A single-stage HEX is one where the air or water only gets heated once. Two of them stacked together would be a two-stage. HVAC refers to heating, ventilation, and air conditioning, HEXs made for HVAC often have water passages made of copper tube, for durability. Cpvc is a type of plastic pipe made for hot water, a cpvc HEX is made of cpvc. I will submerge it in the hot tub and flow the water from the solar collector through it and back to the collector, to keep the corrosive hot tub water from damaging the collector.

Any questions feel free to ask, someone will help. That's how we learn.

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Willie, Tampa Bay
Tori

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Reply with quote  #30 
Thanks guys for those, and especially for the description of each.  That helps.    Now i'm wondering what you'd class my contraption. as..... 

Here's the pic again so you don't have to go back to the 1st. page.

Attached Images
jpeg IMG_1524.JPG (101.71 KB, 26 views)

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