Hello everyone,
we are planning a prefabricated house using timber frame construction. It will have 180 sqm (1,937 sq ft) of living space with underfloor heating, and about 230 sqm (2,475 sq ft) of usable area.
So far, the offer included an air-to-water heat pump from Daikin (Altherma 3R, formerly Rotex HPSU compact Ultra).
Now it seems that this unit might not have enough capacity (?) and as an alternative (additional cost around 4,000) we have been offered a "Wolf heat pump CHC Monoblock 10/300-35".
The Daikin is available in the 4-9 kW version—would that really be insufficient for this size? And what do you think about this offer?
I have the energy-saving regulation heat protection certification and a renewable energy heat law document available, if any information from those is needed.
Thank you very much!
Best regards
we are planning a prefabricated house using timber frame construction. It will have 180 sqm (1,937 sq ft) of living space with underfloor heating, and about 230 sqm (2,475 sq ft) of usable area.
So far, the offer included an air-to-water heat pump from Daikin (Altherma 3R, formerly Rotex HPSU compact Ultra).
Now it seems that this unit might not have enough capacity (?) and as an alternative (additional cost around 4,000) we have been offered a "Wolf heat pump CHC Monoblock 10/300-35".
The Daikin is available in the 4-9 kW version—would that really be insufficient for this size? And what do you think about this offer?
I have the energy-saving regulation heat protection certification and a renewable energy heat law document available, if any information from those is needed.
Thank you very much!
Best regards
P
Pixelsurium8 Aug 2020 14:22tomtom79 schrieb:
Well, it’s a matter of space. If you have a large utility room, then go for a monoblock. If you have outdoor space and no neighbors to bother, then a split system. I thought it was the other way around? Monoblock means everything is outside, while split systems still need an indoor unit.
D
Daniel-Sp8 Aug 2020 15:07At least two water circuits are connected to a mixing buffer. One circuit is the heating circuit of the heat pump, and the second circuit is the underfloor heating. The mixing buffer is charged by the heat pump. The underfloor heating circuit draws heat from the mixing buffer. To prevent the heat from the heat pump in the mixing buffer from being wasted, the buffer must be discharged at the same rate it is charged. Therefore, the flow rates of the two water circuits need to be optimally matched. This is not usually a problem. However, typically the heating circuit pump of a modulating heat pump is power-regulated, while the circulation pump of the underfloor heating is not. This undermines the concept of the modulating heat pump.
P
Pixelsurium8 Aug 2020 16:48Daniel-Sp schrieb:
At a mixing buffer tank, at least two water circuits are connected. One circuit is the heating circuit from the heat pump, the second circuit is the underfloor heating. The mixing buffer tank is charged by the heat pump. The underfloor heating circuit extracts the heat from the buffer tank. To prevent the heat stored in the buffer tank from being wasted, the buffer must be discharged at the same rate it is charged. Therefore, the flow rates of both water circuits must be optimally balanced. This is normally not a problem. However, in most cases, the heating circuit pump of a modulating heat pump is controlled by power output, while the circulation pump for the underfloor heating is not. This contradicts the concept of a modulating heat pump. And what does that mean? Is a mixing buffer tank useless?
D
Daniel-Sp8 Aug 2020 17:13It only causes problems and, at best, significantly reduces efficiency.
For modulating heat pumps, a mixing buffer tank is a no-go.
For modulating heat pumps, a mixing buffer tank is a no-go.
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