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Posts: 31
Reply with quote  #11 
Originally Posted by pianoman8020
Here's a way to cool the house and heat your greenhouse at a very low cost.
When you are building your next new house, insert 6 to 8 runs of  4" tubing parellel and away from the foundation when backfilling. Header them to an 8" tube which could pass thru the foundation wall. This would cool most homes in the US in the summer that use full depth foundations. There could easily be 800 to 1000 feet of tubing in the ground ready to use.

If the tubes are below the frost line the air could be used to heat your greenhouse in the winter.

Jim from IL

Yeah, its called a ground source heat pump - been popular in Europe for about 40 years now. 

And kind of off-topic on the subject of automation.


Posts: 172
Reply with quote  #12 
Actually the system of buried 4" or larger tubes is NOT a heat pump.  As described  it is an "Earth Tube". There is no 'heat pump' involved, just a simple fan to slowly move air through the pipe.

The amount of earth to air heat exchange is proportional to the continuous length of buried pipe, (ie the time spent traveling in contact with the ground) thus running pipes in parallel does not work as well as one continuous length. Finally there is a serious possibility of organisms living in the damp (caused by condensate, especially in a location with high humidity air) pipe, it is best to use pipe made for the purpose, these pipes are sold  impregnated with silver particles, to kill/minimize that problem.

Originally Posted by myk3y

Yeah, its called a ground source heat pump - been popular in Europe for about 40 years now. 


Posts: 31
Reply with quote  #13 
OK. Not what I was thinking of, and still off-topic.

Back on-topic:

It’s taking over my life...

I’ve been playing with a mesh network of distributed wireless controllers with motor drives for window control, pump control, fluid and air direction, as well as thermocouples for sampling.

Surprisingly easy once you have the basics nutted out.

Adding another device is as easy as joining the network after fpdefining a name and task.

Everything is centrally collated and controlled (I’m using a raspberry Pi, but any computer will do).

It’s not going to be trivial to document, but the basic process of making ‘building blocks’ and hookingnthem in is straightforward.

I’m shelving it for the next few weeks as I concentrate on Xmas cheer, drinking, pie eating, etc.

I’ll probably just carry on and finish it and present a completed document, Ray there than bit-at-a-time progress.

For those wanting to dive in themselves, I’m using ESP8266 microcontrollers in a mesh network, with LoRa wireless repeaters for distant installations where home WiFi will be problematic.

LoRa operates over 20-30km line-of-sight, so more than enough grunt for homestead’s, farms, industrial buildings,

Merry holidays and a happy non-denominational new year!
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