X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com Subject: Re: [geda-user] Net length info question To: geda-user AT delorie DOT com References: <0a59af1c-d27e-2b2f-f649-fd5f84ae7fc5 AT linetec DOT nl> <20180203161104 DOT 041fb36a17997541ea44b220 AT gmail DOT com> From: "Richard Rasker (rasker AT linetec DOT nl) [via geda-user AT delorie DOT com]" Message-ID: <22dbfa1f-39de-dced-f24a-451804d75d65@linetec.nl> Date: Sat, 3 Feb 2018 17:01:06 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <20180203161104.041fb36a17997541ea44b220@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id w13G1R5d019647 Reply-To: geda-user AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-user AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk 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]" 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