Ground Source Heat Pumps
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Spot on Chippy, system basically sucks out more heat energy that can be replaced by normal solar activity. Bore hole and surrounding area is froze!!
:beer:As Manuel says in Fawlty Towers: " I Know Nothing"0 -
Wrong!!! Temps at 1.5 mtrs are fairly constant. Refrigerant in the exchanger boils at 0C. I watched the domestic hot water heating thismorning from 46C to 52C in less than 10 minutes.
Nope,
You are wrong. The environment cannot replace the heat at the same rate as it's extracted. Note that I said it can be several years before it's noticed.
There is an actual example somewhere of a village that's been run off a gshp for several years and the efficiency is now dropping off substantially.Happiness, is a Kebab called Doner.....:heart2::heart2:0 -
Nope,
You are wrong. The environment cannot replace the heat at the same rate as it's extracted. Note that I said it can be several years before it's noticed.
There is an actual example somewhere of a village that's been run off a gshp for several years and the efficiency is now dropping off substantially.
I monitor my pump here and have not seen any performance reduction over the last 5 years. If you take the basis that in winter, a heat pump is running circa 10 hours per day, with a flow rate on a ground loop of 11 ltrs per minute (for a 11Kw output unit) , then the recharge time is longer for the loop. At the moment, I am getting 6.0C in with 2.0c out Outside temp 2.0C and snowing today). As the heating need is reduced in say Spring, this then starts to rise and during the summer we get even higher inlet temperatures. Some people use the ground loops to slightly cool the house, as passive cooling in the Summer months, when outside temperatures are higher than the feed in temperatureAs Manuel says in Fawlty Towers: " I Know Nothing"0 -
(reply to post 23)
So the advice would then be to add 50% or 100% to the recommended size of the ground loop?
I've always wondered about how different the 'cooling factor' of a pump would really be in wet ground and dry ground. I would imagine the wetter ground being better for pumps due to how easily the heat is transferred and the moving water table being refreshed constantly and gradually over months/years.
Or am I just being a bit thick...0 -
(reply to post 23)
So the advice would then be to add 50% or 100% to the recommended size of the ground loop?
I've always wondered about how different the 'cooling factor' of a pump would really be in wet ground and dry ground. I would imagine the wetter ground being better for pumps due to how easily the heat is transferred and the moving water table being refreshed constantly and gradually over months/years.
Or am I just being a bit thick...
Yes, wet soil is far better at holding heat than sand, and any installation company should take those facts into account when designing a system.As Manuel says in Fawlty Towers: " I Know Nothing"0 -
Have you come across many people doing their own digging and backfilling of trenches? Does it need to be done by people who have full licenses to comply with installation standards or anything?
I ask as i've done alot of digging and plant work myself before and thought when i get around to it, this could be a massive saving for me.0 -
360 sq metres - all heated? That is a BIG property.
Many of the properties here are old farmhouses that have been restored. The one above is in Tuscany. The norms are around 200+ sq mtrs. Local to myself there are 2 houses 240 sq mtrs using 14Kw pumps, 260 and 300 sq mtr using 17Kw output unitsAs Manuel says in Fawlty Towers: " I Know Nothing"0 -
Have you come across many people doing their own digging and backfilling of trenches? Does it need to be done by people who have full licenses to comply with installation standards or anything?
I ask as i've done alot of digging and plant work myself before and thought when i get around to it, this could be a massive saving for me.
The ground loop collectors ( which must be accessible ) should be at a maximum distance from the house of 40 mtrs and at a depth of 60 cms with the lines insulated and from them to the house/heat pump.
There is no reason why you could not complete the excavations yourself.As Manuel says in Fawlty Towers: " I Know Nothing"0 -
Why was the thread pulled, then re-instated?0
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