Kevin Lotzof Posted October 17, 2021 Share Posted October 17, 2021 We are in the process of renovating an old farmhouse and adjoining barn, piggery and stable block converting it all into living accommodation. In all the floor space is about 7000sqft. We were thinking of installing ground heating to heat the property. We have a dam on the property which is approx. 67m x 37m in size with depths between 1-2m My questions are 1) Is the dam big enough to provide the piping required for the heating. 2) How much should a project like this cost? Link to comment Share on other sites More sharing options...
Nickfromwales Posted October 17, 2021 Share Posted October 17, 2021 Hi. Have you the necessary permissions for abstraction? Link to comment Share on other sites More sharing options...
Marvin Posted October 17, 2021 Share Posted October 17, 2021 8 minutes ago, Nickfromwales said: Hi. Have you the necessary permissions for abstraction? Didn't realise you required a licence to abstract heat from your water on your property, assuming a closed loop ground source heat pump system! Link to comment Share on other sites More sharing options...
SteamyTea Posted October 17, 2021 Share Posted October 17, 2021 1 hour ago, Kevin Lotzof said: 67m x 37m in size with depths between 1-2m That will be around 3700 m3 of water. Taking a worse case scenario of the water being at 4°C, and allowing for a 2°C drop in temperature i.e. taking out half the energy, That will be about 15.5 GJ. So about 4.3 MWh, so quite a lot, just a little lower than the total energy required by my house for a year (but I have a stupidly small house). How is this pond refilled? Link to comment Share on other sites More sharing options...
ProDave Posted October 17, 2021 Share Posted October 17, 2021 52 minutes ago, SteamyTea said: Taking a worse case scenario of the water being at 4°C, and allowing for a 2°C drop in temperature i.e. taking out half the energy, But you know reducing water from 4C to 2C does not take out "half its energy" Link to comment Share on other sites More sharing options...
SteamyTea Posted October 17, 2021 Share Posted October 17, 2021 3 minutes ago, ProDave said: But you know reducing water from 4C to 2C does not take out "half its energy" Depends how deep into quantum physics you want to go. And phase change. Link to comment Share on other sites More sharing options...
saveasteading Posted October 17, 2021 Share Posted October 17, 2021 If the water is cooled by 2 deg it is then heated again by the ground underneath, perhaps some nice rotting going on at the bottom, and the inflow of water (dam not pond) 4 deg is going to be midwinter, so really is a worst case, and don't they quote heat exchangers down to -35C? In summer it will recharge to say 20C. Sounds like a good idea, especially if there is a significant flow of water, but I can't do the sums for it. Link to comment Share on other sites More sharing options...
Kevin Lotzof Posted October 17, 2021 Author Share Posted October 17, 2021 It is naturally filled pond. We also have 300m of river running thru the property Link to comment Share on other sites More sharing options...
SteamyTea Posted October 17, 2021 Share Posted October 17, 2021 1 minute ago, Kevin Lotzof said: We also have 300m of river running thru the property you would be better off using that, as long as the flow is good. Link to comment Share on other sites More sharing options...
Nickfromwales Posted October 18, 2021 Share Posted October 18, 2021 (edited) 20 hours ago, Marvin said: Didn't realise you required a licence to abstract heat from your water on your property, assuming a closed loop ground source heat pump system! It’s mentioned as a dam. Therefore flowing water, not a stagnant lake or pond etc. Flowing water = abstraction license afaik as you’re affecting the downstream ‘condition’ of the water. Further reducing temps in winter can have adverse affects on nature / pond life etc so best to check ( at least ) before going down this route. Edited October 18, 2021 by Nickfromwales Small phone and big thumbs. 1 Link to comment Share on other sites More sharing options...
TonyT Posted October 18, 2021 Share Posted October 18, 2021 Have a look at the old Navitron website, Nowty did this with a culvert under his house, copper coils submerged. Worked for him Link to comment Share on other sites More sharing options...
Nickfromwales Posted October 19, 2021 Share Posted October 19, 2021 On 18/10/2021 at 11:22, TonyT said: Have a look at the old Navitron website, Nowty did this with a culvert under his house, copper coils submerged. Worked for him Were the coils running a brine with glycol ( antifreeze ) inhibitor in it? Link to comment Share on other sites More sharing options...
TonyT Posted October 19, 2021 Share Posted October 19, 2021 Can’t remember think it was some vegetable based product ( in case of a leak) it was 15 pages, it also discussed his PV, and Lead acid battery then move to Lion batteries. Link to comment Share on other sites More sharing options...
TonyT Posted October 19, 2021 Share Posted October 19, 2021 Tried to find the thread, but looks like the site is no longer there, the info isn’t on the new website that a lot of people moved to. maybe the way back machine? Link to comment Share on other sites More sharing options...
saveasteading Posted October 19, 2021 Share Posted October 19, 2021 1 hour ago, TonyT said: some vegetable based product ( in case of a leak) Are we doing puns now? Link to comment Share on other sites More sharing options...
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