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Rick H Parker

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Reply with quote  #81 
"The hotter a collector (or part of it) gets, the more heat is radiated back through the glazing or the skin, REDUCING efficiency."

If that is the case, the glazing is not doing its job. Glazing is supposed to be transparent at Visible and Ultraviolet wavelengths, reflective at Infrared wavelengths. That's how it achieves solar gain.



"I don't know, but why would they do it any other way?"

To support the screen and better distribute the air flow across the collector.




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Rick H Parker
Kansas, USA
Electronics Engineering Technologist

stmbtwle

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Reply with quote  #82 
If that is the case, the glazing is not doing its job. Glazing is supposed to be transparent at Visible and Ultraviolet wavelengths, reflective at Infrared wavelengths. That's how it achieves solar gain. 

No glazing is perfect, nor is insulation. The higher the temperature differential, the greater the losses. That's WHY we keep temperatures low and strive to keep the hot airflow off the glazing.

Every engineered design in the world is a compromise of cost, performance and risk. The trick is to find the best compromise.  If you find a better compromise of cost, performance, and risk, let us know.  

To support the screen and better distribute the air flow across the collector.  Supporting the screen has merit especially in a large collector.  locating those supports to better distribute the air flow is not as easy as it looks, and would probably take specially configured manifolds.  This adds to the work and expense.  Back to the compromise. 

When you get YOUR perfect design up and running, please post the design and the data here. We'd be interested.

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Willie, Tampa Bay
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