The charts to the right and below show the pressure      drop test results of both the metal collector and

  Sunreps Geotextile 307 collector. The size of the

  holes in the respective collector surfaces determine      how fast air can pass through. The smaller the

  hole the lower the flow but the higher the   

  temperature.


  10 cfm per sq ft of air-flow through a collector is 

  scientifically noted as the optimum. The best

  test results Sunreps has seen for a metal collector

  is 7.6 cfm per sq ft. Sunreps' 307 collector has a

  flow rate of 8.5. Overall this difference is rather

  small but in the field of bragging rights, Sunreps

  307 is the current winner.

Collector Test Results

pressure drop, solar air flow, cfm, solar ventilation pre-heater, fabric solar collectors

  Below is the test result for the Sunreps 307 collector fabric. To    be used in the commercial building sector all surfaces of a            duct need to be fire resistant to a specified level. The test   

  results shown below meet those requirements.

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  There is basically one test required to understand the capabilities of a transpired solar collector and that is how fast air will              pass through the collector surface at a specific static pressure level.  .10 inch H2O of pressure is the baseline for a collector.

  At .10 inches or above the wind will not pull the heat off the collector surface.

solarwall, inspirewall, pressure drop test,
ASTM-E84, 25/50,