Recent content by skyfridge

Thanks. (1) A spreadsheet works for the numerical analysis. I've already modeled it numerically, using Stefan-Boltzmann, Berdahl-Martin and G.B. Smith. All that's left is modeling the insulation. Whereas numerical analysis software would be fun, there can be a steep learning curve. Also, the...

Turn the system upsidedown. Use a wide-angle Compound Parabolic Concentrator to funnel the heat up a narrow conduit to a small narrow-angle Compound Parabolic Emitter, with a base made of polyethylene mesh, and then neither wind nor condensation is a problem, as long as you have a condensation...

Thanks for the ideas. I did consider using a truncated cone for an estimate, but I was aiming to look at the compound parabolic shape for comparison, just to see how it looked. How does the length of the curve complicate it? Calculating the radius at any axial length or angle parameter is...

That was my assumption for the uncovered case. However, looking at cold air pooling (meteorology), a valley or basin can retain a cold air pool under certain conditions. Of course, we're talking a difference of scale, but I wondered what the the dynamics were, for the purpose of calculating a...

So I have, Q•δz(Φ)/δA(Φ)=-k•dt; Where A(Φ)=π•y(Φ)2; I couldn't find the exact character for the partial derivative, so I used δ. Am I close?

Yikes! Forget about z() and Φ()! I can just integrate over Φ! Duh! Let me see how that looks.

I'm looking to model the heat transfer by conduction from the aperture to the base of a compound parabolic dish (CPE). Here's what I have so far, thanks to CFDFEAGURU's solution for a cone at https://www.physicsforums.com/threads/heat-transfer-by-conduction-in-a-truncated-cone.368972/ let θ =...

Also, the dynamic pressure of the advection across the aperture would be q=1/2*ρ*t^2 so the advection would be at a lower pressure than the volume in the basin. What does that do to the volume of air in the basin? I'm picturing a vertical pipe filled with water with an inverted temperature...

Hello all, I'm interested in applying science to different aspects of living off the grid and generally saving money in areas of heating, cooling and refrigeration. My current project is engineering a passive refrigerator that achieves refrigeration by applying optics to minimize heat input for...

This question is regarding the general fluid dynamics involving warm air advection aloft a persistent cold air pool in a small basin that is recessed in a horizontal planar surface. For scale, the basin has a compound parabolic shape, with a 30° viewing angle, a .146m radius at the base, a .292m...