[wxqc] Opinions please -- New design for solar radiation shielding

[dshelms at comcast.net]

All:

Certainly, we have seen how mechanically aspirated temperature sensors can substantially overcome less than perfect sensor siting.  This is why even a temperature gathered in close proximity to a vehicle engine will yield satisfactory reports once the vehicle reaches 30 mph or more.  

Regards,

Dave
CW0351


 -------------- Original message ----------------------
From: Dexter McIntyre W4DEX <dmcintyre at att.net>
> My weather station is located at a business in a small town.  There was no place 
> at ground level to locate the temp/humidity sensor.  So I decided to try a fan 
> aspirated 4 inch PVC pipe attached to a tower.  Like Jim's design below I'm 
> using a 12 volt computer fan but it's running about half speed on 6 volts.  So 
> far this seems to work fairly well even though It isn't cute like Jim's bird 
> house.
> 
> Pictures at:
> 
> http://www.flickr.com/photos/7916375@N06/
> 
> Dex, W4DEX, AS618
> 
> jim wrote:
> 
> > I constructed a shield out of 4" PVC "sewer pipe" and 2  90 
> > degree L's forming a "U" shape with a  12V 4" computer fan sucking the 
> > air from the opposite end from the sensor. I used 4" PVC because of the 
> > size of the fan and the sensor housing you can adjust the size to fit 
> > your requirements.
> > I placed this in a "Bird house" with the input end in the bottom of the 
> > bird house at approx. 5' height. I also insulated the bird house on the 
> > inside with garage door insulation.  pictures are on my QC summery page. 
> > I can provide more pictures if you need them or questions. contact me at 
> > jimwc at frontiernet.net <mailto:jimwc at frontiernet.net>
> >  
> > Jim
> > CW4367
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