Time to warm a volume of air to room temperature in a container

[RecoveringMoron]

Positing an empty container, underground, with a static temperature of 50F (both container, earth, and air temperature) and a volume of X...

and introducing (and displacing) into this container a parcel of 30F air of volume Y (which is less than the volume of X)...

Is there any way to determine how much time it would take the 30F degree air Y to warm to 50F?

Thanks much. Just trying to think about if buried air tubes to collect mean Earth temperature might be useful for a project. Thanks much for any help.

 

[CWatters]

You need to know the thermal properties of the container walls. Pretty sure buried air tubes have been used before to preheat ventilation air. Try asking on the green building forum...

http://www.greenbuildingforum.co.uk/newforum/

 

[jrmichler]

Google earth tubes for much good information. There is a lot of experience out there with them.