ᐅ Sizing of Air-to-Water Heat Pumps for New Construction

Created on: 6 Aug 2020 11:45
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Pixelsurium
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
B
Bookstar
6 Aug 2020 20:35
Heating load calculations are rarely accurate. They are usually much too high.
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Daniel-Sp
6 Aug 2020 22:13
Yeah, there is usually a significant "safety margin" added, and just like that, the efficiency disappears... But first, let's see the calculation. Not everyone calculates it incorrectly.
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Pixelsurium
6 Aug 2020 22:27
Hi everyone,

so far, I haven’t seen or received any calculations…

Which data from the thermal insulation certificate according to the Energy Saving Ordinance would be important? (It’s 16 pages)

I’ve attached the Renewable Energy Heat Act and the results pages from the thermal insulation certificate according to the Energy Saving Ordinance behind it (see PDF here).

Does that help?

Best regards
D
Daniel-Sp
6 Aug 2020 22:32
Is it possible to do this without registration?
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Pixelsurium
6 Aug 2020 22:34
Daniel-Sp schrieb:

Is it possible without signing in?

It’s the standard Gdrive link to the file. Is there another way to upload a PDF here?
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Daniel-Sp
6 Aug 2020 22:35
When I click on it, I am asked to log in... I don't want that.
Otherwise, convert each page to JPG.