ᐅ Air-to-Water Heat Pump: Current Consumption and Data

Daniel-Sp schrieb:

Doesn't the heat pump regulate the temperature spread on its own?

It does.

face26 schrieb:

I'm not a professional and haven't fully understood your setup yet. How large is the buffer tank? Is it solely for heating? So, domestic hot water is separate? To what temperature do you heat the buffer?

It is purely for heating water and has a capacity of 100L (26 gallons).

Alessandro schrieb:

It does.

What do you want to set then?

Alessandro schrieb:

It does.



This one is solely for heating water and has a capacity of 100 liters (26 gallons).

According to statements in another forum, this buffer tank is actually far too small for a decoupling buffer.

Alessandro schrieb:

Yes, I understand that.
However, if the temperature difference (ΔT) in the underfloor heating is smaller than that of the heat pump, and the flow rate of the secondary pump is fixed while that of the heat pump is modulating, the flow rate from the heat pump will always be lower than that through the underfloor heating system.
Ideally, it should be the other way around: the heat pump’s flow rate should be slightly higher (100-200 liters/min) than that in the underfloor heating.

If the secondary pump runs at stage 1 with constant pressure, I get a heat pump supply temperature equal to the underfloor heating supply temperature without losses and an exact ΔT of 5°C (9°F) in the underfloor heating!
But then it only delivers 900 liters/min, 1.8 meters, and about 12 watts.

[IMG width="688px" alt="BLW NEO8 Hydraulik - Kopie.jpg"]https://www.hausbau-forum.de/attachments/blw-neo8-hydraulik-kopie-jpg.57179/[/IMG]

Is it possible that the buffer eventually reaches a uniform temperature once all the water is fully mixed?

Your schematic clearly shows why a buffer tank is completely pointless with underfloor heating. First, you heat up the buffer tank fully, then feed lower temperatures into the underfloor heating. Any sensible person would just go directly into underfloor heating at 33°C (91°F) with a higher flow rate than your 900 liters/min.

Okay, so a "safety margin." Given the small size, I can't imagine much settling occurring when the flow is almost continuous.

But large enough to operate a good heat pump inefficiently. Unfortunately