grericht
2023-08-06 14:03:18
- #1
Hello,
short: From the house both pipes go out of the basement at about 1.5m depth to the probe distributor and then about 5m again at only about 50cm depth to the 99m deep boreholes.
long: we have now successfully gotten through the first two winters in the new single-family house. The annual performance factor of the ground source heat pump is overall just above 4. Not record-worthy (neither in the underfloor heating nor in the dimensioning of the heating was much planned beforehand) but I think it's OK. For 2 years I have been thinking again and again whether I am losing some efficiency because maybe the pipes to the two 99m probes lie very shallow in the ground. I haven’t measured it to the centimeter but they lie no deeper than 60cm. Since we want to remove some soil over one of the pipes, it could be only 50cm there.
So this is not even really in the frost-safe zone. I mean, the pipe is regularly "flushed" especially in winter. And it does not freeze at 0 degrees either. But I just have the feeling that it can't be very good to lead probe water at about 9 degrees out of the house, probably cool it again over the first 5m to then warm 2*99m and then cool it down again over the last 5 meters before it goes to the heating.
Question: does this shallow installation probably affect the annual performance factor or even the lifespan of the system?
if yes: are there possibilities/recommendations to insulate the pipes over the first 5m or possibly insulate them in the ground above with e.g. aerated concrete blocks? Or do I have to try to expose them again and lay them deeper?
short: From the house both pipes go out of the basement at about 1.5m depth to the probe distributor and then about 5m again at only about 50cm depth to the 99m deep boreholes.
long: we have now successfully gotten through the first two winters in the new single-family house. The annual performance factor of the ground source heat pump is overall just above 4. Not record-worthy (neither in the underfloor heating nor in the dimensioning of the heating was much planned beforehand) but I think it's OK. For 2 years I have been thinking again and again whether I am losing some efficiency because maybe the pipes to the two 99m probes lie very shallow in the ground. I haven’t measured it to the centimeter but they lie no deeper than 60cm. Since we want to remove some soil over one of the pipes, it could be only 50cm there.
So this is not even really in the frost-safe zone. I mean, the pipe is regularly "flushed" especially in winter. And it does not freeze at 0 degrees either. But I just have the feeling that it can't be very good to lead probe water at about 9 degrees out of the house, probably cool it again over the first 5m to then warm 2*99m and then cool it down again over the last 5 meters before it goes to the heating.
Question: does this shallow installation probably affect the annual performance factor or even the lifespan of the system?
if yes: are there possibilities/recommendations to insulate the pipes over the first 5m or possibly insulate them in the ground above with e.g. aerated concrete blocks? Or do I have to try to expose them again and lay them deeper?