Hybrid Car – More Fun with Less Gas

radiation loss - Page 5

register ::  Login Password  :: Lost Password?
Posted by Morris Dovey on December 7, 2007, 7:13 pm
 
Robert Scott wrote:

| OK, but remember that any electronics that you put out into a
| collector has to survive the stagnation temperature.  The usual
| commercial temperature range for semiconductors is 0 to +70C.  The
| extended/military range is -40C to +125C.  I can see how in some
| collectors, even that may not be high enough to withstand the
| stagnation temperature.

Yuppers - and I'm too much a cheapskate to spend on Mil-Spec parts.
:-)

| A better solution may be to keep all active semiconductors on the
| other side of some insulation to protect it from collector
| stagnation temperatures.

Agreed. I don't want to put any of this stuff /inside/ my panels.
Airflow at the intake, insolation at the (outside) face, and
temperatures at intake and discharge should be sufficient to do the
analysis I'm after.

Thanks!

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/



Posted by Robert Scott on December 7, 2007, 7:39 pm
 


How about some Zigbee modules powered by photovoltaics?  No wires needed.


Robert Scott
Ypsilanti, Michigan

Posted by Morris Dovey on December 8, 2007, 12:54 am
 Robert Scott wrote:
| On Fri, 7 Dec 2007 13:13:41 -0600, "Morris Dovey"
|
|| Agreed. I don't want to put any of this stuff /inside/ my panels.
|| Airflow at the intake, insolation at the (outside) face, and
|| temperatures at intake and discharge should be sufficient to do the
|| analysis I'm after.
|
| How about some Zigbee modules powered by photovoltaics?  No wires
| needed.

My original thought had been to go wireless. The mesh network has
considerable appeal, but the pricing seems more targeted toward
defense contractors.

Thanks, but I think I can live with the wires.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/



Posted by Morris Dovey on December 13, 2007, 8:09 pm
 Morris Dovey wrote:
| Robert Scott wrote:

|| How about some Zigbee modules powered by photovoltaics?  No wires
|| needed.
|
| My original thought had been to go wireless. The mesh network has
| considerable appeal, but the pricing seems more targeted toward
| defense contractors.

To offer a bit of closure. I've ordered a USB to 1-wire adapter plus
1-wire light and temperature sensor kits from HobbyBoards
(www.hobbyboards.com) - and a Linksys NSLU2 "slug" from
SuperWarehouse.

The NSLU2 provides two USB ports and an ethernet connection. One of
the USB ports will be dedicated to the 1-wire net and the other to a
USB hub. The USB hub will be the connection point for a pair of CF
(compact FLASH) reader/writers. The first CF will hold a Linux system
and the logging software, and the second CF will be my data logging
device. A pair of 1GB CF cards should provide plenty of filespace.

With the ethernet connection and Linux, I suppose that the whole thing
could be internet connectable, but I think I'll settle with just being
able to log temperature and insolation for a start. It /would/ be fun
to set up a web page where people could watch collector performance in
real time, tho. :-)

I still haven't found a usable/affordable airflow meter, and suspect
that I will end up rolling my own.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/



Posted by Duane C. Johnson on January 2, 2008, 1:43 am
 Morris;


 > I still haven't found a usable/affordable airflow
 > meter, and suspect that I will end up rolling my own.

Try this one as a start.
http://www.redrok.com/misc1.htm#anemometer

 > Morris Dovey
 > DeSoto Solar
 > DeSoto, Iowa USA
 > http://www.iedu.com/DeSoto/

Duane

--
     Home of the $5 Solar Tracker      Receiver
    http://www.redrok.com/led3xassm.htm       [*]
   Powered by             \  \     \        //|
  Thermonuclear   Solar Energy from the Sun / |
Energy (the SUN)           \  \     \  /  /  |
Red Rock Energy             \  \     /   /   |
Duane C. Johnson   Designer  \  \  /  \ /    |
1825 Florence St  Heliostat,Control,& Mounts |
White Bear Lake, Minnesota    === \   / \    |
USA      55110-3364                ===   \   |
(651)426-4766        use Courier New Font \  |
redrok@redrok.com     (my email: address)  \ |
http://www.redrok.com   (Web site)          ===

This Thread
Bookmark this thread:
 
 
 
 
 
 
  •  
  • Subject
  • Author
  • Date
please rate this thread