Green Hemp insulation got more than 50 percent absorption at 20hz

[bluesj]

Hi.

according to the following link

http://www.thermo-hanf.de/upload/pdf...spekt_engl.pdf

hemp insulation Flow Resistance is 6.0 kPa·s/m2

and i ran porous absorber calculator and got 50 percent of absorbtion at 20 hz

look at the attatched img file plz

yes it is only 0 degree incident but when i change the angle of incidence for simulating random incidence, i got more than 50 percent of absorbtion percentage closing to 70 percent...

even though it is 25cm thickness and 80cm airgap... but it's awesome properties.. isn't it?

[Brainchild]

That is awesome, if you can afford that much space!

[Ethan Winer]

Originally Posted by bluesj

i ran porous absorber calculator and got 50 percent of absorbtion at 20 hz

I find that difficult to believe.

[S.Filpansick]

Originally Posted by Ethan Winer

I find that difficult to believe.

I think that you have to absorb 50% of the green hemp to achieve those results!

[bluesj]

Ok, this is the recent version of calculator result...

[Ethan Winer]

I'm skeptical of "prediction" software. As they say, extraordinary claims demand extraordinary proof. In this case, the proof needed is actual measurement data. Even a side-by-side comparison of hemp versus other materials could be done in a small room using room measuring software. But I need to see something concrete. A simulation won't do.

--Ethan

[Brainchild]

Looks like it's testing time.

[bkbirge]

I worked freelance in a place owned by a big time drug dealer once. He showed me a room they were building out, all the insulation was packed bales of weed. I always wondered how they were going to get it out without tearing down the room.