ᐅ Heat load calculation is 10.3 kW; is an air-to-water heat pump with 9.5 kW capacity sufficient?
Created on: 5 Mar 2020 22:09
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hippjoha
Hello everyone,
I just had a brief phone call with our heating engineer. The heating load calculation resulted in a value of 10.3 kW. He would recommend a 9.5 kW air-to-water heat pump (nothing else is possible since drilling, etc., is not allowed), among other reasons because it is eligible for funding through BAFA.
My question now is whether this air-to-water heat pump is adequately sized. In the open-plan living room, we also have a wood stove.
I hope someone here can clarify this for me.
Thank you very much!
Best regards,
Hannes
I just had a brief phone call with our heating engineer. The heating load calculation resulted in a value of 10.3 kW. He would recommend a 9.5 kW air-to-water heat pump (nothing else is possible since drilling, etc., is not allowed), among other reasons because it is eligible for funding through BAFA.
My question now is whether this air-to-water heat pump is adequately sized. In the open-plan living room, we also have a wood stove.
I hope someone here can clarify this for me.
Thank you very much!
Best regards,
Hannes
We have a KfW70 standard, which is the current energy saving regulation, with about 245m2 (2,640 sq ft) of heated floor space and an 8 kW Buderus unit that unfortunately does not modulate. I don’t find your calculated values plausible—the heat pump sounds oversized, and that will cost you both in the higher initial purchase price and later in operating costs.
Did a heating contractor recommend this combination to you?
P.S. Nowadays, there are heat pumps that work with ring trench collectors or ground drilling; these are more forgiving of configuration errors compared to air-to-water heat pumps.
Did a heating contractor recommend this combination to you?
P.S. Nowadays, there are heat pumps that work with ring trench collectors or ground drilling; these are more forgiving of configuration errors compared to air-to-water heat pumps.
tomtom79 schrieb:
We have KfW70, which is the current energy saving standard, with about 245m2 (2,635 sq ft) of heated floor area and an 8kW Buderus unit that unfortunately does not modulate. I don’t understand how you arrive at your values; the heat pump sounds oversized and that will cost you—both in a higher initial purchase and in operation. Did a heating engineer recommend this combination to you?Unfortunately, I haven’t received the data yet. That was just the statement over the phone yesterday. He received the heating load calculation with this result and recommends this heat pump, since it is also subsidized by BAFA, among other things.
Okay, so you think it is more likely too large? I actually thought it might still be too small... With a modulating heat pump, if I understand correctly, it wouldn’t be such a problem if it’s oversized, right? For example, if it only needs 7kW, would it just run at 7kW?
D
Daniel-Sp6 Mar 2020 09:11Yes, variable-capacity heat pumps should not be oversized so that the lower modulation limit is low enough to allow continuous operation at warmer temperatures.
The 10.3 kW (11.6 kVA) also seems quite high to me...
The 10.3 kW (11.6 kVA) also seems quite high to me...