ᐅ Air-to-air heat pump vs. air-to-water heat pump vs. trench ground collector – Differences
Created on: 12 Dec 2019 10:33
N
Neubau2020
Hello,
I am currently trying to decide how the heating energy should be generated.
Here in the forum, I came across the horizontal ground loop collector, which I find very interesting. In conversations with two prefabricated house suppliers, I mentioned that I am considering generating energy with a horizontal ground loop collector. Both times, the response was, "We’ve heard of horizontal ground loop collectors, but never installed one."
One offer included an air-to-water heat pump (Luxhaus KfW55), and the other included an air-to-air heat pump with controlled residential ventilation (Streif Haus KfW40). The house will have two levels, no basement, around 190 m² (2,045 sq ft), on a fairly flat plot with no special features.
I am wondering how the horizontal ground loop collector differs technically and in price from the air-to-water heat pump.
Is the technology inside the house the same, or are there other factors to consider, such as system size and design?
Is the main difference simply that instead of the external unit of the air heat pump, I install the trench and lay the pipes?
What is the price difference?
What about the long-term difference in energy consumption? The air heat pump needs to run continuously on electricity to draw in air—how does it work with geothermal energy from the horizontal ground loop in this regard?
Lastly, a question regarding the air-to-air heat pump:
The sales representative from Streif Haus said that if I wanted to switch from the air-to-air heat pump to an air-to-water heat pump, it would cost about 10,000 euros more. Is that a realistic estimate?
I am currently trying to decide how the heating energy should be generated.
Here in the forum, I came across the horizontal ground loop collector, which I find very interesting. In conversations with two prefabricated house suppliers, I mentioned that I am considering generating energy with a horizontal ground loop collector. Both times, the response was, "We’ve heard of horizontal ground loop collectors, but never installed one."
One offer included an air-to-water heat pump (Luxhaus KfW55), and the other included an air-to-air heat pump with controlled residential ventilation (Streif Haus KfW40). The house will have two levels, no basement, around 190 m² (2,045 sq ft), on a fairly flat plot with no special features.
I am wondering how the horizontal ground loop collector differs technically and in price from the air-to-water heat pump.
Is the technology inside the house the same, or are there other factors to consider, such as system size and design?
Is the main difference simply that instead of the external unit of the air heat pump, I install the trench and lay the pipes?
What is the price difference?
What about the long-term difference in energy consumption? The air heat pump needs to run continuously on electricity to draw in air—how does it work with geothermal energy from the horizontal ground loop in this regard?
Lastly, a question regarding the air-to-air heat pump:
The sales representative from Streif Haus said that if I wanted to switch from the air-to-air heat pump to an air-to-water heat pump, it would cost about 10,000 euros more. Is that a realistic estimate?
ludwig88sta schrieb:
Yesterday, besides the currently preferred air-to-water heat pump or gas heating, I also came across the trench collector heat pump. I have the following questions about it:
Main concern: - Installing it myself seems feasible after renting an excavator, but on the strip where the trench collector is installed, no plants will grow later due to the frost. How far does this cold spread, i.e., how wide is the exclusion zone around the trench collector for plants, trees, bushes, and similar vegetation?
Secondary topic: - Do I always need to hire a paid expert beforehand to determine if my soil is even suitable? There are trees, bushes, some hedges, flowers, grass, etc. above our collector... No distance is needed at all.
You can assess the soil yourself; there are plenty of threads about this in the pink forum. As long as you don’t have rock and your property is of a reasonable size, there are hardly any cases where it doesn’t work.
L
ludwig88sta19 Dec 2019 09:12Really? I always thought that the frost, which forms below the frost line, would extract so much energy from the soil that plants wouldn’t survive within a certain area of the trench collector.
How deep is your trench collector, or do you have a surface collector? 1.5 or even 2 meters (5 or 6.5 feet) deep?
Is Rosa Forum a synonym for Haustechnik-F?
How deep is your trench collector, or do you have a surface collector? 1.5 or even 2 meters (5 or 6.5 feet) deep?
Is Rosa Forum a synonym for Haustechnik-F?
L
ludwig88sta19 Dec 2019 10:22Tego12 schrieb:
Your interpretation of pink is correct
My horizontal ground heat exchanger is 1.5m (5 feet) deep. Of course, energy is extracted, but I have not noticed any impact on vegetation around my property compared to my neighbors. You will find similar experiences reported in the mentioned forum. What went wrong with your neighbors? Or do you mean they also have horizontal ground heat exchangers and have not experienced any problems?
S
Strahleman19 Dec 2019 11:01ludwig88sta schrieb:
Yesterday, besides the currently favored air-to-water heat pump or gas heating, I also came across the horizontal trench collector heat pump. I have the following questions about it:
Main concern: - I imagine that installing it yourself by renting an excavator is feasible, but on the strip where the horizontal trench collector is installed, due to frost, no plants will grow later. How far does this cold spread, meaning how wide is the exclusion zone around the horizontal trench collector for plants, trees, shrubs, etc.? This is a persistent myth that is not true. A horizontal trench collector is usually installed about 1.5m (5 feet) underground. Yes, it extracts energy from the ground, but not nearly enough to create a desert or permafrost conditions. You can plant normal vegetation and trees above the collector without any problems. The "frost" you mentioned is a freezing effect around the pipes (which is actually intended). However, this occurs only underground and will hardly be visible on the surface. Also, any ground heaving or settling at this depth is very unlikely. And no, there is definitely no snow left in June above the area where the collector is installed.
It is similar to saying that it always snows around the outdoor unit of an air-to-water heat pump because energy is extracted from the air.
You can also assess the soil yourself with the finger test (https://de.wikipedia.org/wiki/Fingerprobe_(Boden)) or check it in your soil report.
L
ludwig88sta19 Dec 2019 14:34So it turned out to be fake news. About oil heating or hot water heat pump or whoever it was.
Thank you!
@Neubau2020 How are you deciding now, or which option are you leaning towards?
Thank you!
@Neubau2020 How are you deciding now, or which option are you leaning towards?
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