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re: cooling of pv modules (was calculating windload...)
29 dec 2002
george ghio   wrote:

>> >...this pipe is 16 feet in either direction that the holes will need to
>> >get progressively larger to maintain even flow rates over the length of 
>> >the array.
>> 
>> maybe not, if the total hole area is small compared to the pipe cross
>> section or we vary the hole spacing vs the size or we recognize that
>> the center of the array needs more cooling.

>yes nick. as if you could work out the spaceing. 

would you please work it out for us, george?

>...the last time this garage was 32 x 14

i envision a 14' running roof length with a 16.5 degree tilt
and sloping n/s sides that make the ground footprint 32'x22'.

>>           south
>> 
>>            32'
>> 
>> p-----------p-----------p
>> |   |   |   |   |   |   |
>> |   |   |   |   |   |   |
>> |   |   |   |   |   |   | 22'
>> |   |   |   |   |   |   |
>> |   |   |   d   |   |   |
>> p-----------p-----------p
 
>ar you sure you're noy a used car salesman.

i ar sure i'm noy. i did sell encyclopedia britannicas briefly.

>> this wouldn't cost more than $2,800, nor $31,250-$17,325 = $13,925,
>> but i'm still uncomfortable wasting all this heat...

>> sharp electronics corporation
>> 
>> photovoltaic module limited warranty
>> 
>> ...this warranty does not apply to any appearance items of the product nor
>> to the additional excluded item(s) set forth below nor to any product the
>> exterior of which has been damaged or defaced, which has been subjected to
>> misuse, abnormal service or handling, or which has been altered or modified
>> in design or construction.

if we install panels on a porch roof with a white wall above, and
it rains on the panels, is that "misuse" or "abnormal service"?
 
>> additional item(s) excluded from warranty coverage... when:
>> 
>> a) the product is improperly installed,
>> b) the product is installed in a mobile or marine environment, subjected to
>> improper voltage or power surges or abnormal environmental conditions (such
>> as acid rain or other pollution),

"marine" brings to mind "salt" unlike this situation. 

>> [the drum might have some limestone in the bottom.]

making this rain less acid than ordinary rain...

>> d) external corrosion, mold discoloration or the like occurs...
>> 
>> [and a pinch of copper sulfate.]

i've heard of an early navy experiment with algae forming on water-cooled
panels. it seems to me that an occasional bake in the sun or 5 ppb of copper
ion would prevent that. 

>as i said no warranty.

i disagree. this warranty (and kyocera's and unisolar's) is (are) interesting
in that they don't mention mirrors or concentration or radiation enhancement
or water cooling. unisolar says "90 c max," but sharp has no explicit mention
of temperature... 

nick




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