Welcome to the Solar Collector
Brainstorming and Development Page!


 

Home

Hot Air Collector

Hot Water Project 1

Hot Water & Space Heating

Solar Electric

Solar Construction 101

FAQs

Best Collectors

Simply Solar
Register Calendar Latest Topics
 
 
 


Reply
  Author   Comment   Page 3 of 4      Prev   1   2   3   4   Next
mclark999

Registered:
Posts: 183
Reply with quote  #21 
Quote:
Originally Posted by stmbtwle
A good start but I can see a problem.

You'll have to support the weight of the collector somehow. Otherwise the lower pipe will eventually bend under the weight and bind.


I'm planning on having swivel mounts for the panel separate from the swiveling vents. Another post has a lazy Susan type mount. I had been thinking of something mounting to galvanized pipe. More to come

__________________
Denver, CO

Double screen hot air collector

mclark999

Registered:
Posts: 183
Reply with quote  #22 
Quote:
Originally Posted by gbwillson
I think Gordy's PVC solution would work great for the duct connection, though I have my doubts about the pivot action operating smoothly, as all of the weight will be on the lower pivot unless you can somehow rig it so the top pivot has some of the weight. I have an idea on how to do this rattling around in my head when you get that point. Adding bearings or a bushing to the pivots might help ease the movement too. 

Since we are approaching the winter solstice next week is there any way you could chart runtime on a sunny day from now until you shut it down in the spring? Might be helpful to see how much run time you actually achieve with a pivoting unit compared to a stationary unit.

Greg in MN


It's going to be a little hard to compare because my current box gets shaded by a tree in the late afternoon and this will have more clear light then. I could track start up times as that's where my main gain will be as the house is angled slightly southwest so I miss early morning sun with the current box vertically attached to the wall.

__________________
Denver, CO

Double screen hot air collector
mclark999

Registered:
Posts: 183
Reply with quote  #23 
Quote:
Originally Posted by Gordy
I didn't know HD had that big of pipe available, also did not think an elbow would be that much $$$. What I was thinking was an elbow like this, and rigged like in the drawing below.

https://www.homedepot.com/p/Charlotte-Pipe-8-in-PVC-DWV-90-Degree-1-4-Hub-x-Hub-Elbow-PVC-00300-1800/203949945

[charlotte-pipe-elbows-pvc-00300-1800-64_145] collector slip joint.jpg 
What I was thinking, is the same setup on top just flipped over so it is pointing down,



__________________
Denver, CO

Double screen hot air collector
mclark999

Registered:
Posts: 183
Reply with quote  #24 
Nice drawing. I would go that route if the elbow wasn't so expensive. What I think I can do instead is use a pvc coupling to straight pvc pipe for the swivel and then clamp a galvanized furnace elbow to the pvc coupling to save cost.
__________________
Denver, CO

Double screen hot air collector
Gordy

Registered:
Posts: 137
Reply with quote  #25 
Greg,

By no means was that meant as a finished design. For the bottom it would be easy enough to mount roller blade bearings or the like to the outside of the inner pipe, that would ride against the edge of the elbow. May want to add a steel ring to the elbow to keep the bearings from mushrooming the PVC.

The top may be a bit more of a challenge. First thought is to router a couple slots in the elbow about an inch from the edge, big enough for the bearings to fit into and ride in. Second thought would be a steel ring mounted to the elbow but hanging below it, for the bearings to ride on. Both of these have the bearings mounted to the inner pipe.



Willie,

In #14 I did mention bracing.

__________________
Gordy,
Minnesota
gbwillson

Avatar / Picture

Registered:
Posts: 2,249
Reply with quote  #26 
One thing is for sure...you'll want to get the pivot and mechanism figured out before building the collector. Gordy, I was thinking about the retainer ring for the bearings. I hadn't thought about trying to route a groove in the duct. But I'm thinking that integrating the ducting into the pivot is greatly complicating the build. Seems to me that if the pivot was centerline top and bottom of the unit and the ducting entered via the back of the unit it would greatly simplify the construction. Rigid ducting could be used to within a foot or so of the back midline of the collector and flex duct could complete the duct connection. The flex duct could simply move with the collector as it pivots. 

Greg in MN
stmbtwle

Avatar / Picture

Registered:
Posts: 2,748
Reply with quote  #27 
Suppose you built the ducts out of plywood, the lower one could double as the support.  With a flat top, a turntable bearing could carry the weight with a short metal duct through the center of the bearing. At the top, the same setup but you probably wouldn't need the turntable bearing. The plywood ducts/support could be easily insulated with polyiso.  Something like this:  
collector.jpg 


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

Registered:
Posts: 137
Reply with quote  #28 
One issue I have is the turntable bearing itself, I have had them rust and lockup. Especially in the shed and garage where high humidity can be an issue. Some have holes around the perimeter that allow you to insert a needle type grease adapter, others don't.  For those that don't have the holes, the needle generally is not long enough to reach in between the plates far enough to get the grease on the balls. You could drill holes, but at the risk of getting chips and burrs in there. What I did was solder some small tube to a zerk and flatten the tube enough to fit in the gap between the top and bottom plates.
__________________
Gordy,
Minnesota
stmbtwle

Avatar / Picture

Registered:
Posts: 2,748
Reply with quote  #29 
Some of them are prone to rust. Probably depends on how much you are willing to pay. I saw some in aluminum, and they might be available in stainless, though I haven't found any yet.

Another option could be to cut several "thrust washers" out of polyethylene or nylon and let it ride on them instead of a bearing. Nothing to rust or lock up.

__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
mclark999

Registered:
Posts: 183
Reply with quote  #30 
Thanks for all the great ideas. I'll be working on a plan between now and November. 
__________________
Denver, CO

Double screen hot air collector
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

 

web statistics