Mail Archives: geda-user/2018/02/03/11:02:31
Op 03-02-18 om 16:11 schreef Nicklas Karlsson
(nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]:
> On Sat, 3 Feb 2018 14:57:56 +0100
> "Richard Rasker (rasker AT linetec DOT nl) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> wrote:
>
>> Hi all,
>>
>> Maybe a rather unusual question, but at the moment, I'm "abusing" PCB in
>> the construction of our new home, intended to rely on 100% solar energy:
>> we plan to use the ground under the house for storing heat, by laying 3
>> lengths of 100 m (~300 ft) of tubing in the foundations as a heat pump
>> source.
> You might get a problem in case your heat pump cool your foundation below zero degree Celsius?
Yeah, I know, but those things are covered -- I've hired a professional
who doesn't just supply the hardware (heat pump, PVT panels etcetera --
although I'll build the system controller myself), but who also helped
design and calculate the whole system.
For most of the time, the heat pump draws its source straight from the
heat exchangers on the solar panels. The subterranean heat storage is
only used when the solar panels get below freezing point, and as we have
a mild sea climate here in the Netherlands, this happens a few weeks per
year at most. With a heat storage of ~100 cubic meters of water at 20°C
and a very well insulated house, we should be good for about a month of
icy, low daylight (cloud cover) conditions before this source runs low.
Also, the heat pump switches to a built-in electric heater spiral if the
source temperature gets too low. This, of course, is far less efficient,
but the fact that we'll be selling surplus electricity back to the grid
for most of the year more than makes up for the (hopefully) very rare
occasions that this happens. And oh, there's also still the central
fireplace.
But it's exciting all the same, and I really hope that our calculations
and estimates pan out!
Best regards,
Richard
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