ᐅ Is a brine-to-water heat pump still worthwhile for a KfW 40+ energy standard building?
Created on: 6 Dec 2021 10:36
0
009_frank
Hello everyone,
We are planning a prefabricated house built to KfW 40+ standard, including two residential units of 95 m² (1,023 sq ft) each. One of these units will be rented out. Unfortunately, four different suppliers have given us four different opinions regarding the heating system. Some say that a ground-source heat pump (brine-to-water) is not worthwhile because of the drilling and costs, especially since we also have ventilation systems with heat recovery, so an air-to-water heat pump would be completely sufficient. Whether to choose a monoblock or split system is also debated among the suppliers. As a layperson, it’s quite confusing.
What is your opinion on this?
Best regards
We are planning a prefabricated house built to KfW 40+ standard, including two residential units of 95 m² (1,023 sq ft) each. One of these units will be rented out. Unfortunately, four different suppliers have given us four different opinions regarding the heating system. Some say that a ground-source heat pump (brine-to-water) is not worthwhile because of the drilling and costs, especially since we also have ventilation systems with heat recovery, so an air-to-water heat pump would be completely sufficient. Whether to choose a monoblock or split system is also debated among the suppliers. As a layperson, it’s quite confusing.
What is your opinion on this?
Best regards
Benutzer200 schrieb:
By the way, is the borehole as a heat source depleted?Could you explain that? I wasn't aware that this was possible. Or does it always happen sooner or later?At the moment, I am getting an air-to-water heat pump, but maybe for the next project...
Tolentino schrieb:
Can you explain that? I wasn’t aware that this was an option. Or does it happen anyway sooner or later?If the extraction capacity and drilling depth match, nothing will happen.Tolentino schrieb:
Could you explain that? I didn’t realize that was an option. Or does that inevitably happen sooner or later?
At the moment, I’m getting an air-to-water heat pump, but maybe for the next project...That was just the tip of an otherwise unsubstantial post. Best forgotten.
B
Benutzer2007 Dec 2021 07:50Tolentino schrieb:
Can you explain that? I didn’t realize that was a possibility. Or does that happen inevitably sooner or later?@guckuck2 wrote that the heat source will also need to be replaced at some point. Obviously, he means the heat pump (whether ground-source or air-to-water heat pump) – but he also raised a valid point that the heat source itself, such as the borehole, could be depleted. With proper design, nothing happens. However, I have seen improperly designed horizontal ground loop collectors that extracted too much heat. That’s really bad then.guckuck2 schrieb:
That was just the tip of an otherwise empty post.There is a grammatical mistake. It should be: "just the tip of an otherwise empty post."Benutzer200 schrieb:
@guckuck2 wrote that even the heat source sometimes needs to be replaced. Of course, it’s clear that he means the heat pump (whether brine-water heat pump or air-water heat pump) – but he also suggested that the heat source itself, meaning the borehole, could be depleted. With proper design, nothing happens. However, I have seen incorrectly designed horizontal ground collectors where too much heat was extracted. That’s really bad then. You misunderstood that knowingly. Of course, this is about replacing the heat source of an air-water heat pump, which is usually not necessary for a brine-water heat pump, especially for special boreholes. Because this heat source is not exposed to the weather and has fewer moving parts (if any at all).
Benutzer200 schrieb:
There is a grammatical error in that. It should say "only the tip of an altogether meaningless" post. q.e.d.
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