ᐅ Comparison of Geothermal Heat Pump and Air-to-Water Heat Pump
Created on: 8 Aug 2020 22:33
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mjammjammjam
Starting point: In the builder’s cost estimate, an air-to-water heat pump Nibe F2040 with a 180-liter (48-gallon) hot water tank is listed. Additionally, there are electric towel radiators and appropriate insulation to meet KfW-40 house standards. This package is supposed to cost us €13,900.
After some research, I found out that ground source heat pumps have a higher annual performance factor. According to the builder’s catalog, the air-to-water heat pump has a COP of 3.6, while the ground source heat pump has at least 4.5. In this case, it is a Nibe 1255.
Even though I don’t yet know the potential price for the 1255 from the builder, I would like to ask,
I look forward to your answers, as a non-expert I feel a bit lost here (at least I do right now)...
After some research, I found out that ground source heat pumps have a higher annual performance factor. According to the builder’s catalog, the air-to-water heat pump has a COP of 3.6, while the ground source heat pump has at least 4.5. In this case, it is a Nibe 1255.
Even though I don’t yet know the potential price for the 1255 from the builder, I would like to ask,
- what you paid for any borehole drilling for the ground loops?
- how the running costs compare between air-to-water and ground source heat pumps
- what you had to pay for your eligible Nibe units
I look forward to your answers, as a non-expert I feel a bit lost here (at least I do right now)...
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T_im_Norden13 Jan 2021 14:36The air-to-water heat pump can, of course, provide cooling if the manufacturer enables this function.
An air conditioner is essentially an air-to-water heat pump without underfloor heating.
An air conditioner is essentially an air-to-water heat pump without underfloor heating.
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neo-sciliar13 Jan 2021 14:42T_im_Norden schrieb:
The screed does not emit cold but absorbs heat and transports it to the heating system.
There, the heat is transferred to the medium (brine or air) via the heat exchanger.This only works if the medium is colder than the heat from the house. Otherwise, we are talking about active cooling. But: air is known to be a poor heat storage medium. If I place a heat conductor on steel heated to 60°C (140°F), it quickly warms to 60°C (140°F); if I blow 60°C (140°F) warm air onto it, it takes a long time. So how does the room efficiently transfer heat to the floor?neo-sciliar schrieb:
which only works if the medium is colder than the heat inside the house. Otherwise, we are talking about active cooling.Yes, the medium must be colder than the environment to be cooled, and no, it is not automatically active cooling just because the mentioned medium is colder.
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neo-sciliar13 Jan 2021 14:47guckuck2 schrieb:
Yes, the medium must be colder than the environment to be cooled, and no, it is not automatically actively cooled just because the mentioned medium is colder. It was meant the other way around: if the medium is warmer than the air inside the house, then active cooling is necessary. Passive cooling is not possible in that case. And with an air-to-water heat pump in summer, this will generally always be the case, unless the heating system is also turned on.
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T_im_Norden13 Jan 2021 14:50Ground slab = Passive except for the energy used by the pump
Air-to-water heat pump = Active through reversal
Air-to-water heat pump = Active through reversal
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BauBauNRW13 Jan 2021 15:22T_im_Norden schrieb:
Brine system = passive except for the energy used by the pump
Air-to-water heat pump = active through reversalAnd this is what my original question was about: How effective is passive cooling? For example, can you notice any effect during midsummer?
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