JohnnySmith
2017-08-10 17:07:31
- #1
Hello,
we bought a semi-detached house last year and are in the final stages of starting the renovation and extension to a KFW55 efficiency house.
We have a gas connection, but it will probably be difficult to achieve KFW55 with it.
The KFW efficiency expert made a preliminary assessment with an air-water heat pump and it works. However, I find a brine-water heat pump more attractive.
The Geological Office Hamburg says the following:
"From nearby boreholes, the following generalized layering results: sand up to 1 m depth, till loam up to 3 m depth, sand up to 23 m depth, till marl (Drenthe main moraine) up to 30 m depth, and sand up to 60 m depth. It should be noted that only about 300 m away there is a shallow emergency drinking water well, which is filtered in the groundwater horizon below the Drenthe main moraine. Due to the short distance, geothermal probe drilling must not be carried into this production horizon here. The groundwater level is at about 7 m depth; stagnant water is present from approximately 0.5 m depth.
Also, the heat extraction capacity of a surface collector is likely low because the stagnant water body dries out periodically."
So only surface collectors are possible, although I am uncertain because of the statement about the drying stagnant water body. The installation should also presumably be laid in the till loam layer up to 3 m.
In the attachment, I have tried to implement the whole thing in a layman's way using a trench collector. Would that work like this?
Best regards,
JohnnySmith
we bought a semi-detached house last year and are in the final stages of starting the renovation and extension to a KFW55 efficiency house.
We have a gas connection, but it will probably be difficult to achieve KFW55 with it.
The KFW efficiency expert made a preliminary assessment with an air-water heat pump and it works. However, I find a brine-water heat pump more attractive.
The Geological Office Hamburg says the following:
"From nearby boreholes, the following generalized layering results: sand up to 1 m depth, till loam up to 3 m depth, sand up to 23 m depth, till marl (Drenthe main moraine) up to 30 m depth, and sand up to 60 m depth. It should be noted that only about 300 m away there is a shallow emergency drinking water well, which is filtered in the groundwater horizon below the Drenthe main moraine. Due to the short distance, geothermal probe drilling must not be carried into this production horizon here. The groundwater level is at about 7 m depth; stagnant water is present from approximately 0.5 m depth.
Also, the heat extraction capacity of a surface collector is likely low because the stagnant water body dries out periodically."
So only surface collectors are possible, although I am uncertain because of the statement about the drying stagnant water body. The installation should also presumably be laid in the till loam layer up to 3 m.
In the attachment, I have tried to implement the whole thing in a layman's way using a trench collector. Would that work like this?
Best regards,
JohnnySmith