[time-nuts] Practical considerations making a lab standard with an LTE lite

Jim Sanford wb4gcs at wb4gcs.org
Sun Nov 23 14:24:11 EST 2014

Interesting comment about the geothermal.

I have to take continuing education courses in order to maintain my PE; 
one was in geothermal.

Intuitively, great for cooling, even (especially!) in Florida. 
Intuitively, not so hot for heating, especially in PA, and especially 
with the price of natural gas plummeting.

The guy who services our conventional AC and gas furnace was not very 
enthused, when I told him I was considering geothermal for the next 
cooling unit.  He got a little more enthused when he found out I already 
have more pipe in the ground than I'd need (ft per ton of cooling 
capacity) and a several thousand gallon in-ground tank. Still not 
excited about it.  I really appreciate your new data point.

Shortly, I'll post response to all replies to my original post on this 
topic.  For now, the bury it option might actually have use here.


On 11/23/2014 11:46 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
> On 23 Nov 2014 14:45, "Bob Camp" <kb8tq at n1k.org> wrote:
>> Hi
>> If you have a basement in your house / building
> I do not.
>> —and —
>> it’s dry and reasonably draft free (no garage doors opening up from time
> to time)
> My lab is a room which is part of the garage! Just about everything is
> against me with this method,  BUT you do give me an idea...
> You got me thinking about the possibility of actually mounting the TCXO
> burried in the ground!   The temperature of that is not going to change
> very rapidly.
> FWIW, I know a guy that did work as an air conditioning engineer,, but now
> works for a company selling geothermal heating.  He installs  ground source
> heat pumps for the geothermal energy.  He says that they actually work
> quite poorly in many cases. In a couple of years the temperature of the
> ground falls as the heat is extracted faster than it replenishes.  So the
> efficiency falls off. I don't think that the TCXO would heat the ground
> faster than it dissipates away.
> Of course there would be some practical issues burying the TCXO, but those
> would not be insurmountable ones. I have no idea what depth might be
> needed.
> My wife thinks thinks I am a nutcase - that would only confirm it to her!
> Dave, G8WRB
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