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stmbtwle

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Reply with quote  #21 
Just a term. It's intended to block the sun, some claims to block up to 90%.

https://www.lowes.com/pd/Phifer-Super-Solar-Screen-Wire/1016585?cm_mmc=SCE_PLA_ONLY-_-ToolsAndHardware-_-SosScreenGlass-_-1016585[tongue]hifer&CAWELAID=&kpid=1016585&CAGPSPN=pla&k_clickID=0e93dea9-cca7-48b1-92bb-9dd51344a340

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Willie, Tampa Bay

gbwillson

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Reply with quote  #22 
I remember checking solar shades out at garden supply stores. Growing plants in a greenhouse probably does take a bit more specific product. Whereas for screening a house a generic term of solar, or sun screen is sufficient. The sun screen rolls I have look to be about 3 times as dense as normal window screen. They do this simply by having 3x the fibers. No percentage of sun reduction is listed. I'll try and snap some closeup pics tomorrow. I only have one,my largest window facing south and even with a good window, it can allow more heat than I'd like in the summer. Actually, I installed the window about 15 years ago, so the screens could use a re-do.

Greg in MN


stmbtwle

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Reply with quote  #23 
Make sure the screen is outside the glass...

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Willie, Tampa Bay
gbwillson

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Reply with quote  #24 
They are, which is nice in that you can tilt the windows in for cleaning, but this also dirties and wears out the screens faster.
stmbtwle

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Reply with quote  #25 
No testing today. New 125cfm, 200mm fan is installed, but I'm a bit concerned about it as I don't know if it can pull that much air through the HEX. However if it doesn't work I'll go with two, 70cfm, 120mm fans which I believe can pull more air. I'll have to make an adaptor plate for them though.

No changes in the rear screen until the fan problem is solved.

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

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Reply with quote  #26 
Do you have a close up of the HEX? I'm surprised you are having trouble moving enough air through the HEX since the air doesn't have to flow through any screens. Is air being pushed or pulled through the HEX? Have you ever tried attaching a fan directly to the HEX? 


Greg
stmbtwle

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Reply with quote  #27 
Only pix of the HEX are here: https://simplysolar.supporttopics.com/post/show_single_post?pid=1294762098&postcount=1&forum=282856

It's an auto heater core about 6" square x 2" thick. No room to attach a fan directly to it, but that more likely would restrict the flow. The "duct" is only about a foot long and just about the same area of cross section, I don't think that's the issue.

Anyway I removed the 125 cfm fan, and replaced it with 2 x 70cfm fans, one of them is the same fan I was running a couple days ago. Oddly enough in a short test this afternoon performance with twice the power seems to be WORSE! The HEX was not touched nor were either of the screens altered. I'm puzzled but I suspect it was the PV panel as it was getting on in the afternoon. Maybe another test tomorrow on the battery.

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

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Reply with quote  #28 
Is the fan pushing or pulling air through the HEX?

Greg
stmbtwle

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Reply with quote  #29 
Pulling. I do this to protect the fan from the heat. It's a closed system so I really doubt it makes that much difference.

I've about decided the HEX simply isn't big enough.

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

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Reply with quote  #30 
Yeah, those heater cores and radiators might allow a lot of air to pass through them while driving down the road, but with a small fan, they can be pretty restrictive. I can't even see any light when I look through my radiator. Would a radiator fan from a car work better than a computer fan? I can't imagine a junkyard would change much. It would be awful loud unless you potted down the speed.

Greg in MN

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