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
Sign up Calendar Latest Topics
 
 
 


Reply
  Author   Comment   Page 2 of 2      Prev   1   2
netttech

Registered:
Posts: 720
Reply with quote  #11 
The 2 layer screen panel the fan cyles on/off starting around 8:30am. It sustains (fan on constantly)  good heat @ around 9am.

The sustained temp starts in the low 90's that progressively warms into the 100's. The 5 day average of maximum recorded temp is 110 on sunny or mostly sunny days.

I'm using a 4" suncourt inductor fan, rated @ 65 cfm free airflow. The panel starts cycling off/on after 3pm & generally cools below the snapswitch by 3:45. The panel continues to works passively for about 1 more hour.

The 2 layer-flashing panel produces a higher temp (about 8 degrees), but the airflow (same fan size) is a lot worse. It failed a garbage bag test over the weekend.  I am using twin-wall glazing on both panels.

Fan spec:  http://www.suncourt.com/Inductors.html

Jeff
Central IL

solarusmc

Registered:
Posts: 180
Reply with quote  #12 
Hi

When the windows are slid 'up' to install the hot air collector, what are you guys doing about the air space at the top edge of the bottom window?

Are you just stuffing some foam insulation in there above the window like in the gab between the 2 windows?

Thanks,

__________________
Pat B. Warwick, Rhode Island Rest Assured! Comments and/or suggestions I make here at the forums on 'your' projects as well as my own have all been carefully and scientifically calculated by the 'seat of my pants'
Scott Davis

Avatar / Picture

Super Moderator
Registered:
Posts: 697
Reply with quote  #13 
With about 3 CFM per square foot of air flow, you should typically see a 50F - 60F temperature rise from your hot air solar panels.
__________________
Take care, Scott MD
Louieb

Registered:
Posts: 24
Reply with quote  #14 
Hi, solarusmc, joebehr, and Scott

   I am using foam at the top of the window like you said to fill in the gap between the 2 window 
panes. Also foam around the sides of the window box. I used heavy duty weather stripping on the top
and bottom of my collector. I also cut a 1x2 to wedge between the top of the bottom window and the
header so once installed you can't open the window by accident [eek].

On a side note i added a small computer fan to my box on the bottom left side of the intake
and what I found was if I filled in the rest of the bottom opening with foam the fan took a long time
to come on (the air was not rising do to no natural flow). If i removed the foam i had a nice thermal
siphon happening and the fan came on quick. I am seeing 65 deg in and 110 out with a
40cfm computer fan. I feel the fan helps to make the collector run more efficient. 
solarusmc

Registered:
Posts: 180
Reply with quote  #15 
Scott,

Thanks for that info on the CFM air flow calculations...

appreciate it.

__________________
Pat B. Warwick, Rhode Island Rest Assured! Comments and/or suggestions I make here at the forums on 'your' projects as well as my own have all been carefully and scientifically calculated by the 'seat of my pants'
jwnova99

Registered:
Posts: 16
Reply with quote  #16 
Can anyone elaborate on their sensors and fans? Are the computer fans running on 120V or a small solar panel?

Thank you,
Jason
Scott Davis

Avatar / Picture

Super Moderator
Registered:
Posts: 697
Reply with quote  #17 
Hi Jason,

This thread details the snap switch and differential controller options for turning your fans / pumps on and off:

http://www.simplysolar.supporttopics.com/post/how-do-i-turn-my-fan-pump-on-and-off-automatically-when-the-sun-is-6085998

__________________
Take care, Scott MD
netttech

Registered:
Posts: 720
Reply with quote  #18 
I'm using fiberglass insulation to seal off around the panel top, sides & the under the panel on the window frame. I use the foam pipe (for 1/2" pipe)insulation, cut in half length-wise & the window width. The foam compresses easily & I just work it between the two windows.  I just have this stuff on hand, left over, so I use it.

I also install the heat-shrink plastic on the inside of the window frame, because it generally doesn't seal it 100%.

Jeff
Central IL
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

 

web statistics