NABCEP test disclosure [RE-wrenches]

[Dean T. Newberry]

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Hi Bill,
The software guys at CCEnergy have a simple spreadsheet template that
quantifies shading using the Solar Pathfinder.
Each cell in the range represents the insolation for each hour of each 
month as depicted in the pathfinder grid. Just open an instance of the 
spreadsheet and delete the values which are in the shade pattern as 
depicted by the pathfinder.
Shading losses can be calculated by hour, month, summer/winter and annual.
A macro can populate the grid with the lattitude needed for each instance.
We also use some weather data for each city to adjust for cloud cover.
The tool takes just a couple of minutes to input (delete) the shading 
from the pathfinder.

For information on radiant infrared emissivity, infrared absorbtion, 
radiant insulation etc. the Handbook for the Radiant Insulation 
Manufacturers Association(RIMA) linked below is a good text. 
http://www.rima.net/handbook/index.htm

I hope this helps

cul  deant

Bill Brooks wrote:

>Jay,
>
>Now we're talkin'. Thank you all for proving my point to the exam committee
>that trigonometry is beyond the scope, and maybe the ability, of a competent
>PV installer. I am still wondering how you develop a realistic
>quantification of shading using Trig. I took out two full pages of Trig
>explanation in the Study Guide because I thought it would  cause more harm
>than good. The Task Analysis determines what is and is not important for the
>PV installer and the word Trigonometry is not found in the task analysis.
>
>Measuring azimuth and altitude angles of obstructions and plotting them on a
>sun chart is more useful than trig, but even that is more difficult than a
>competent installer is willing to do (it also does not quantify the impact
>of shading).
>
>Everyone seems to be dancing around the fact that shading evaluation tools
>are few and far between. Even though the Solar Pathfinder is not without
>problems, I am unaware of anything that come close from the standpoint of
>flexibility.
>
>Any Wrenches have a better means of calculating shading that is currently
>available on the market today? Bring it on.
>
>Bill.
>
>
>-----Original Message-----
>From: Jay Peltz, Peltz Power [mailto:jay at asis.com]
>Sent: Monday, December 01, 2003 5:28 PM
>To: RE-wrenches at topica.com
>Subject: Re: NABCEP test disclosure [RE-wrenches]
>
>
>HI All,
>
>
>There is no excuse to have a test in 2003/4 with having to memorize things
>like this.  We are not in the days of pencils and paper, but in the days of
>lap tops, books of calculations, laser levelers, GPS, and NEC code books etc
>that WE ALL TAKE TO THE JOB, so why do I have to memorize this???
>
>I make no bones about the fact that in this information age, the issue is
>not memorization, but knowing what to use, where to find it and how to use
>it.
>
>And this is exactly the issue of disclosure that is being discussed here.
>
>Rant off,
>
>jay
>
>Peltz Power
>
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-- 

 
* Cooperative Community Energy* 	*Dean T. Newberry*

430 D Street, Davis CA, 95616
Tel: 530 758-6064
Fax: 530 758-3684
Email: deant at dcn.org
Web:  CCEnergy.com       
      Talbott Solar <http://www.dcn.davis.ca.us/go/deant/>

Contr. Lic. # B-667908

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