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

[Dr. David Kirkby (Kirkby Microwave Ltd)]

On 23 Nov 2014 17:49, "Poul-Henning Kamp" <phk at phk.freebsd.dk> wrote:
>
> --------
> In message <
CANX10hB0KdrnaAYzGvM1gkDUJ7gkLth0AcdxCZG894hxbUScFQ at mail.gmail.com>
> , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes:
>
> >He installs  ground source
> >heat pumps for the geothermal energy.  He says that they actually work
> >quite poorly in many cases.
>
> There is a BIG difference between geothermal and ground heating.
>
> Geothermal means you drill at least 50m (Iceland) or more likely
> half a kilometer down, in order to harvest water at near boiling
> point from the Earths geological heat-sources (mostly uranium decay).

Sorry.  What he installs is pipes in the ground in residential or
industrial sites. Basically he says they work initially,  but performance
drops dramatically over a couple of years.

> If you extract more energy than you deposit sunshine, you end
> up freezing a larger and larger volume of water/soil around
> the pipe and your compressor will eat a lot of electricity.

That is what he was saying.

Dave.