boreholes for ground source heat pumps......

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There are mainly two different systems utilising boreholes for ground sourc e heating. Closed loop systems continuously pump an antifreeze mix through a loop whic h may go down an array of boreholes, the depth and number of boreholes is d ependant on the kilowatt output required and specific geology in the area. Generally speaking this can become very expensive on large scale installati ons. If natural groundwater is present, a more efficient and cheaper alternative would be to go for an open loop system which extracts the heat from the na tural water. Another borehole can also be installed to divert the water bac k underground once the heat has been extracted. An abstraction licence woul d be required if more than 20,000 litres per day was abstracted, for instal lations using under 20,000 litres per day a licence is not required. If you were considering this type of heating it would also be worth checkin g out the renewable heat incentive for this type of project. The other advantage with open loop is that you would also have your own wat er supply

Reply to
boreholedriller1

... kinds of idiot.

Ones who take a hint and the other kind ...

*plonk*
Reply to
Huge

What's the beef?

This is a specialist professional offering pertinent and timely advice without advertising.

IMV if he continues to post in that manner then he's a welcome addition to this group, no different from our other resident pro's and if someone asks him to post his company details I have no problem with him posting those too.

Anyone else agree or otherwise?

Reply to
fred

????????????????

Explain

Reply to
ARW

... relevance.

Perhaps someone could point him at the wiki if he wants to dispense his pearls of wisdom?

Reply to
Huge

In message , fred writes

OK here.

I would have liked comment on EA consent involvement. Is this free of charge?

The 20 cu.m open loop hint concerning RHI is a bit commercial when linked to the modest energy extractable but would have been very relevant when we were discussing this.

Reply to
Tim Lamb

WTF is "we" and where was it discussed?

Jim K

Reply to
Jim K

rce heating.

ich may go down an array of boreholes, the depth and number of boreholes is dependant on the kilowatt output required and specific geology in the area . Generally speaking this can become very expensive on large scale installa tions.

maybe surprising but I'm talking "medium domestic"....

ve would be to go for an open loop system which extracts the heat from the natural water. Another borehole can also be installed to divert the water b ack underground once the heat has been extracted. An abstraction licence wo uld be required if more than 20,000 litres per day was abstracted, for inst allations using under 20,000 litres per day a licence is not required.

how many KW can you get out of 20000 litres/day?

ing out the renewable heat incentive for this type of project.

unless you already had one...

Jim K

Reply to
Jim K

Human being; a spacesuit for a fish>it's a ba-na-na . . . .

Reply to
Murmansk

No problem. I can't understand why anyone should want to kill file him. Dyspepsia perhaps?

Reply to
Peter Crosland

In article , Murmansk writes

The purpose, in this case, is to distinguish my posts from someone who has chosen to use my established tag rather than choose one of their own.

Reply to
fred

kW would be how big a heat pump you had and how fast you can shift the water, within limits. kWHr is the energy available.

Water has a specific heat of 4,187 J/l/K, say ground water arrives at

12 C and you return it at 2 C, so a 10 K temp difference. 4187 * 20000 * 10 = 837400000 Joules or 226 kWHr.

So it seems that 2000 l/day (22.6 kWHr) would be able to heat a modern house reasonably well *but* this is low grade heat, underfloor heating required unless you go for a two stage heat pump to get water temps similar to those of a conventional wet radiator system.

Reply to
Dave Liquorice

In message , Jim K writes

Here a couple of years back. I think one thread covered extractable energy from a modest river level change and the other on ground source heat pumps.

The EA gets very stuffy if you extract more than 20 cu.m of water or return more than 10 cu.m.

Reply to
Tim Lamb

I have a neighbour who has one. There are various ideas. His is the one with two boreholes (not very deep). He pumps water from one and sends it back down the other (at a much lower temperature.

The big gotcha is the costs of pumping water in/out of the boreholes. He also has solar panels and half of this solar output goes in pumping. If he didn't have solar PV panels this two borehole system would make no sense at all.

He has endless problems with it but it was an early days one when nobody had a clue, things are much better now I think. I lot revolved around he initial design and lack of communication between contractors. You definitely need the whole project to be done by one company with lots of experience. No new boys, there were lots of unforseen problems.

The other system is with a closed loop of pipe in a single much bigger borehole. This is a much better system as there are only the frictional losses to consider (Much lower pumping costs). The loop is concreted in with a special conductive concrete.

I have another two neighbours with trenches. They are very reticent about operating costs, I suspect it is because they are higher than they were led to believe. But it could be they are unable to do the calculations.

The plumbing is unbelievably complex.

Unfortunately, not a "before and after situation" to make a comparison that way. One is new build the other never had heating.

They both are recipients of the RHI money.

If you wanted a visit/speak to them, I could probably fix it. W. Midlands.

Reply to
harryagain

Something odd about that calculation (conversion from Joules to kW hours) but my maths are known to be suspect:-)

>
Reply to
Tim Lamb

I've often wondered about this low grade heat collecting, does it not eventually end up an a frozen lump as the heat is taken out until its being done too fast for it to warmup again? I've often thought as well that when we empty away hot or warm water in winter we could extract the heat from it as well but never enquired. Brian

Reply to
Brian Gaff

Surely, its obvious that boring people make bore holes.. Brian

Reply to
Brian Gaff

I agree, but cold not resist the pun, sorry. Its this new year making me slightly dafter than normal. Brian

Reply to
Brian Gaff

Joules and kWh are both units of energy, the only thing that's odd is that the answer should be 232 kWh.

Reply to
Andy Burns

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