[wxqc] Opinions please -- New design for solarradiation shielding

[Bryce Alexander]

I had seriously considered using something similar to yours, but I am trying
to come up with something that is passive, even in Arizona, rather than run
power to the fan for aspiration. What makes my design unique is that by
placing it at an angle (similar to the angle of a solar panel) the
convective nature of the air will self aspirate the tube. An inverted J
design will trap warm air at the top and absolutely require fan aspiration.
What makes this angled design unique is that it shouldn't require the fan.

The fact that it is a tube is only a small part of the overall design.

-----Original Message-----
From: wxqc-bounces at lists.gladstonefamily.net
[mailto:wxqc-bounces at lists.gladstonefamily.net] On Behalf Of Philip
Gladstone
Sent: Saturday, May 05, 2007 7:45 AM
To: Discussion of weather data quality issues
Subject: Re: [wxqc] Opinions please -- New design for solarradiation
shielding

Thomas Giella KN4LF wrote:
> Hi Bryce,
>
> I tried that design 20 years ago and it worked fairly well with forced 
> aspiration but shortwave radiation and precipitation entry was a problem
at 
> certain times of the year. I ended up using a white plumbing PVC tee and a

> couple of 45 degree elbows and that kept shortwave radiation and 
> precipitation out. For ventilation I used a DC 45 cfm computer type muffin

> fan, with the fan sucking fresh air in from the front and passing across
the 
> sensors before reaching the fan. This design worked as good as my louvered

> Stevenson Screen.
>
> BTW the bottom of the shelter should be 4-5 feet above ground level.
>
>
>   
I am now using a similar design -- an inverted J made out of PVC with a 
muffin fan. See the pictures on 
http://weather.gladstonefamily.net/site/C0003

Philip

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