Return to the Hydroponics Forum | Post a Follow-Up

 o
subterranean heating and cooling system

Posted by homehydro (My Page) on
Wed, Mar 30, 11 at 18:01

I have meaning meaning to reply about it but thanks hex for the images of how you built the subterranean heating and cooling system in the other thread. In one of the images was the term "subterranean heating and cooling system," so I did a search for that phrase and came up with some good links and info about how it works. I have a question for you though, have you tested it at different humidity levels? From what I have read, the warm air/humidity is cycled underground where it condenses there, and comes up as cool dryer air. So it seems to reason that the efficiency would be related to relative humidity. More humidity, more condensing, more cooling. I live in a dry climate, so I assume I would probably need to introduce a swamp cooler or humidifier in the greenhouse for better efficiency.


Follow-Up Postings:

 o
RE: subterranean heating and cooling system

Hi HH
I`ve seen large differences in the inlet/out temperatures with inlet RH down in the high 30`s. Obviously the higher the RH the better it gets. It was designed to be installed in a greenhouse where excess humidity and solar gain are not in short supply :)


 o
RE: subterranean heating and cooling system

Thanks Hex,
That's what I figured from what I've read so far. Our RH is below 20% most of the year. I have 2 digital weather stations, and the minimum reading is 20% RH. That's all it reads 3/4's of the year until the monsoon season. So all I know is it's below that. But your right a dedicated greenhouse will naturally have higher humidity.


 o
RE: subterranean heating and cooling system

I`m not sure how useful it will be but if you have cold night temps you could run the system at night to discharge heat from the mass. Its a good way to increase the daytime cooling capacity when a less than optimal sized soil mass isnt keeping up with the daily solar gains.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Hydroponics Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here