No problem. In all our thermal models we have "q_solar", which is the
solar load on various day types. At altitude in an aircraft q_solar is
significant, and is most felt in the cockpit because of the glass. It is a
little trickier with an air exchange like in an airplane, but pretty
straightforward in a closed car. There are variables, but I think I can
get you a good method / answer tomorrow if I have a few minutes. Neat
problem. Just the sort of stuff to distract a whole staff of
themodynamicists for a while.
----------
> From: Richard D Arnold <richard.arnold@juno.com>
> To: mgs@autox.team.net; spridgets@autox.team.net
> Subject: Way Off-Topic -- passive solar heating
> Date: Wednesday, December 09, 1998 9:50 AM
>
> My apologies in advance for wandering so far afield on this one....
>
> Thought I might draw on the vast and varied knowledge of the list -- I am
> working on a project that involves being able to prove that the
> temperature inside a closed vehicle during the summer is substantially
> higher than outside. Given the number of warnings we hear each summer
> about not leaving kids or animals inside a locked vehicle, you'd think
> that there would be a quantifiable source for this, but there doesn't
> appear to be.
>
> I understand that this is called passive solar heating, and is similar to
> the greenhouse effect. I also understand that there are a number of
> different factors that come into play. What I am looking for is a
> formula or published table from a reputable source that says that if it
> is X degrees outside a car, on the average it will be Y degrees inside
> the car. If a formula is used, I need to be able to authenticate it.
>
> The only facts I have is that the outside temperature reached a high of
> 85 degrees F, the humidity was was 80%, and the car was gold with a tan
> interior. It sat in one spot, unshaded, from 3:30 am (outside temp 70
> F), through 3:00 pm (85 F) ( the outside temp reached 80 F by noon that
> day).
>
> I already checked with assorted animal rights groups (made sense at the
> time).
>
> Any suggestions?
>
> Rich Arnold
> Council Bluffs, Iowa
>
> '74.5 RB MGB "Maggie"
> '78 Chevy Half-Ton "Waltzin' Matilda"
> '79 Midget "Miss Molly"
>
> richard.arnold@juno.com or rdarnold@neonramp.com
|