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mattie

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Reply with quote  #1 
Interesting clip on ventilation.It sends air underground to earth tubes to either pre heat the air in winter or cool it in summer to save energy, Air is fed thru the heat exchanger(air heat recovery) afterwards it meets an air pre-heater (if needed) before it enters the building,because of the underground route taken by the air ,less energy is applied to incoming air in order to meet the required internal building or indeed greenhouse grow temperature.



Ive since seen that this type of system is called an  EAHE -Earth air heat exchanger or a GCHE -Ground Coupled Heat Exchanger.
Regards Mattie

mattie

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Reply with quote  #2 
More related info here.
http://www.builditsolar.com/Projects/Cooling/EarthtubeNotes.htm

the link to the pdf on BIS seems broken i believe this is the guide

http://www.rehau.com/download/815550/awadukt-thermo-urun-programi.pdf

Another pdf  based more on cooling(from what ive seen so far)

http://www.passivehouse.us/phc2012/2012%20Presentations/Morosko_Earth%20Air%20Tubes_%20Denver%202012.pdf

a nice table of results using earth tubes and ERV

http://www.greengaragedetroit.com/images/9/9a/EATube_ERV_Summary.pdf


Regards Mattie
mattie

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Reply with quote  #3 
Some more highly useful links from Garage Hermit.

http://www.homeintheearth.com/tech_notes/earth-tubes/earth-tube-design-for-earth-sheltered-homes/#the-equations-


http://www.authorstream.com/Presentation/SANJEEVSINGH786-910503-earth-tube-heat-exchanger-ppt/
Philo

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Reply with quote  #4 
cool idea [smile]
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