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Solar Air Collector - Typical output temp?

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Posted by schooner on October 28, 2005, 7:27 pm
 
Just curious what the typical output temps people are getting from their
units on a bright sunny day.
What sort of range is common/expected for a decent designed and working
unit?



Posted by schooner on October 28, 2005, 7:31 pm
 
Or I guess a better way to ask is what is the typical temp rise from input
to output.



Posted by Morris Dovey on October 29, 2005, 7:24 am
 schooner (in yYu8f.49734$yS6.6514@clgrps12) said:

| Just curious what the typical output temps people are getting from
| their units on a bright sunny day.
| What sort of range is common/expected for a decent designed and
| working unit?

The south-facing 6'x12' passive collector on my shop wall
(http://www.iedu.com/DeSoto/On-Wall (S).jpg) was producing ~100F
temperature gain for a good part of Friday (yesterday) - but I didn't
take time to measure airflow.

Gain ranges from about 15F midsummer to about 150F at midwinter; and
the airflow depends on the temperature.

Subsequent redesigns have raised the operating temperature somewhat
while significantly increasing airflow - one of these days RSN (Real
Soon Now) I need to rebuild this panel using what I've learned since I
built it.

Decency is a fairly subjective item in this arena - with a fair number
of variables involved (such as reliability, longevity, cost,
efficiency, control systems, power requirements, and even aesthetics).

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



Posted by Morris Dovey on October 29, 2005, 7:30 am
 Gack! OE converted degree signs into zeros - please note!


Morris Dovey (in hxF8f.109$Fu1.4705@news.uswest.net) said:

| schooner (in yYu8f.49734$yS6.6514@clgrps12) said:
|
|| Just curious what the typical output temps people are getting from
|| their units on a bright sunny day.
|| What sort of range is common/expected for a decent designed and
|| working unit?
|
| The south-facing 6'x12' passive collector on my shop wall
| (http://www.iedu.com/DeSoto/On-Wall (S).jpg) was producing ~1000F

100 degrees F

| temperature gain for a good part of Friday (yesterday) - but I
| didn't take time to measure airflow.
|
| Gain ranges from about 150F midsummer to about 1500F at midwinter;

15 degrees F                             150 degrees F

| and the airflow depends on the temperature.
|
| Subsequent redesigns have raised the operating temperature somewhat
| while significantly increasing airflow - one of these days RSN (Real
| Soon Now) I need to rebuild this panel using what I've learned
| since I built it.
|
| Decency is a fairly subjective item in this arena - with a fair
| number of variables involved (such as reliability, longevity, cost,
| efficiency, control systems, power requirements, and even
| aesthetics).

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



Posted by nicksanspam on October 29, 2005, 11:44 am
 

I saw them as blodges, squares full of dots.


http://www.iedu.com/DeSoto/On-Wall (S).jpg) was producing ~100 degrees F
temperature gain for a good part of Friday (yesterday) - but I
didn't take time to measure airflow.

A temp gain seems fairly meaningless by itself. Lower temps might indicate
better performance, with less heat loss to the outdoors.
How would you measure airflow?

Nick


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