Air-water heat pump current consumption and data

2021-02-10 07:21:35

As far as I know, the buffer tanks are supposed to prevent/compensate for too short operating times of the compressors caused by closed ERR. It is often the case that the refrigerant also serves as a lubricant, and if the pump only runs for about 30 seconds at a time, it is not sufficiently lubricated. The buffer is supposed to ensure lubrication for at least 5 minutes.
I think they deal more with customers who use the ERR and then report their defective compressors within the warranty period, rather than customers who crown a highly efficient heat pump as their new hobby.

Brötje justified it exactly like that to Heizu.
The only strange thing is the size and type of the buffer. A 100L tank where the flows meet and completely turn the content upside down, in my opinion, is not a buffer but an efficiency killer.
At Heliotherm, who are behind Brötje, such a small buffer is not provided at all. It starts at 300L there. The heat pump and underfloor heating flow temperature will also match more precisely.
I would like a bigger buffer, but do I want to sacrifice the space in the utility room for it?

2021-02-10 07:42:02

That the energy saving ordinance prescribes an ERR, but no max. flow temperature is really quite surprising!

My experience with my system is that my heat pump doesn't care about the flow temperature at all. The heat pump always takes 2 kWh whether the flow temperature is 30 degrees or 35 degrees.

The only difference for me is the outside temperature, which forces the heat pump to run longer and/or start earlier.

2021-02-10 07:44:55

My experience with my system is that the flow temperature doesn't matter at all; the heat pump always consumes 2kWh, whether the flow temperature is 30 degrees or 35 degrees. The only difference for me is the outside temperature, which forces the heat pump to run longer and/or turn on earlier.

But that contradicts all physics and heating technology. Higher flow temperature significantly increases consumption, especially with a heat pump.

2021-02-10 07:46:06

I mean that more in connection with the installation spacing of the underfloor heating. You can clearly see the difference here whether you are designing for 35°C or 32°C. Or what is the point if I work with ERR to save energy and still have to operate with 40°C flow temperature to heat the place? For me, the heat pump runs most efficiently when the flow rate is constantly high. Although this increases the compressor capacity, it allows the flow temperature to be lowered. I can't imagine that your flow temperature does not significantly affect the efficiency

2021-02-10 08:02:52

I mean that more in connection with the installation spacing of the underfloor heating. You can clearly see the difference here whether you design for 35°C or 32°C. Or what is the point of working with ERR to save energy and still having to operate with 40°C flow temperature to get the place warm? For me, the heat pump runs most efficiently when the flow rate is constantly high. Although this increases the compressor power, it allows the flow temperature to be lowered. I can’t imagine that your flow temperature does not significantly influence the efficiency

Of course, the generated flow temperature also has an influence on the efficiency, as can be seen in the performance diagrams of the heat pumps. These are usually specified for 35°C and 55°C heating water temperature. And indeed, the COP at the same air temperature is worse at 55°C heating water than at 35°C heating water. What kind of heat pump does have? Modulating or fixed speed?

2021-02-10 08:04:58

I believe he definitely had it, it could of course be that the minimum performance is so high that 35 degrees also work with it.

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Air-water heat pump current consumption and data

Alessandro

Zaba12

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Alessandro

Daniel-Sp

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