ᐅ Integration of Air-to-Water Heat Pump, Photovoltaic System, and Energy Storage
Created on: 29 Dec 2019 23:12
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Appel2000
Hello everyone,
In our new build, an air-to-water heat pump will be installed as the heating system. The system will be installed by our general contractor (GC) or their heating company.
I would now like to have a photovoltaic (solar) system installed on the roof (not through the GC, but by a specialist company that I select myself), with the unused electricity being stored.
The idea behind this is, among other things, to generate part of the electricity needed for the air-to-water heat pump ourselves.
Since I wanted to inform myself a bit before talking to the heating company and the solar company, I searched online. Unfortunately, it wasn’t really helpful.
What I found out is the order in which photovoltaic electricity is used:
1) Current consumers in the house
2) Battery charging
3) Air-to-water heat pump
4) Feeding into the grid
Is this correct so far?
Then you need the technical prerequisites so that the inverter, battery, and air-to-water heat pump can communicate with each other.
Who provides these prerequisites and who usually configures this? The heating company or the solar installer? Are special devices required for this?
When the air-to-water heat pump needs electricity again, the battery should of course be used first before drawing from the public grid. Does this also work if we have a special heat pump tariff?
I would appreciate it if someone could shed some light on this!
Thanks in advance and best regards
A
In our new build, an air-to-water heat pump will be installed as the heating system. The system will be installed by our general contractor (GC) or their heating company.
I would now like to have a photovoltaic (solar) system installed on the roof (not through the GC, but by a specialist company that I select myself), with the unused electricity being stored.
The idea behind this is, among other things, to generate part of the electricity needed for the air-to-water heat pump ourselves.
Since I wanted to inform myself a bit before talking to the heating company and the solar company, I searched online. Unfortunately, it wasn’t really helpful.
What I found out is the order in which photovoltaic electricity is used:
1) Current consumers in the house
2) Battery charging
3) Air-to-water heat pump
4) Feeding into the grid
Is this correct so far?
Then you need the technical prerequisites so that the inverter, battery, and air-to-water heat pump can communicate with each other.
Who provides these prerequisites and who usually configures this? The heating company or the solar installer? Are special devices required for this?
When the air-to-water heat pump needs electricity again, the battery should of course be used first before drawing from the public grid. Does this also work if we have a special heat pump tariff?
I would appreciate it if someone could shed some light on this!
Thanks in advance and best regards
A
blackm88 schrieb:
The systems are installed and programmed so that electricity is first used for self-consumption, then the battery storage is charged, after that any excess photovoltaic energy goes to the heat pump, and anything beyond that is sold to the grid.Before charging a storage battery that will later be discharged—with losses involved—the electricity should go directly to the heat pump.
The order you mentioned definitely doesn’t make much sense...
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hausbauer30 Dec 2019 23:38Yes, the order of priorities, assuming an estimated storage efficiency of 80%, is not only a financial mistake but also an environmental one...
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Appel200031 Dec 2019 11:16Yes, and this targeted overcharging is exactly what should happen before the battery is filled. I consider this to be much more practical....
Appel2000 schrieb:
Yes, and this targeted overcharging is supposed to happen precisely before the battery is filled. I consider that much more sensible....However, charging the hot water tank is relatively inefficient, especially when overcharging at even higher temperatures.
Storage losses occur in both cases.
Hmm.
You can probably calculate it; I think both options are quite similar.
If the system’s controller allows it and is flexible enough, you could shift the heat pump’s operating times into the daytime as described. That means running it when the sun is shining on the roof and the outdoor air temperature is higher than at night. Then, the system would operate with an increased flow temperature (if the controller temporarily permits this and detects that free electricity is currently available from the solar panels). This would cause the screed to overheat slightly and release heat for a longer period, ideally enough so that the heat pump doesn’t need to run at night. That’s the theory—practical implementation is another matter entirely...
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