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

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SUMMARY

The discussion centers on calculating the time required for a volume of 30°F air to warm to 50°F within an underground container. Key factors influencing this process include the thermal properties of the container walls and the specific heat capacity of the air. The concept of using buried air tubes to preheat ventilation air is mentioned, with references to existing practices and resources available on the Green Building Forum and Google Earth tubes for further information. Understanding these principles is essential for optimizing energy efficiency in building projects.

PREREQUISITES
  • Thermal properties of materials
  • Specific heat capacity of air
  • Heat transfer principles
  • Knowledge of buried air tube systems
NEXT STEPS
  • Research thermal conductivity of container materials
  • Study specific heat capacity calculations for air
  • Explore heat transfer equations relevant to air warming
  • Investigate practical applications of buried air tubes in green building
USEFUL FOR

Engineers, architects, and sustainability professionals interested in energy-efficient building design and air temperature management.

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

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