Air-to-water heat pump sizing in new construction

Morning,

I have now also received the calculation and also a slightly too high volume flow for the pump (1421 vs 1205). But I also noticed that the TGA engineer planned with 16x2 pipes instead of 17x2? Does the pipe dimension also affect the required volume flow? Sorry for the maybe stupid question, but I always slept through physics and then dropped the subject as early as possible.

Ok, I just found out that the exact model is unimportant for the BAFA. So planning changes are possible; only the maximum funding amount cannot be changed after the first month. From the perspective: Can anyone recommend a combination of air-to-water heat pump + controlled residential ventilation with joint control without KNX? Generally, the Geisha from Panasonic is referred to as a price/performance miracle among air-to-water heat pumps. Is there a suitable controlled residential ventilation system for it? Or conversely, Zehnder is considered the best controlled residential ventilation— is there a suitable heat pump for it? Required dimensions: Air-to-water heat pump: 6000 W standard heating load 1421 l/h volume flow Controlled residential ventilation: 151 m³/h normal volume flow up to 196 m³/h max. Thanks and regards Tolentino

So my Arotherm split 3.5 kW outdoor unit with Unittower 58/t5 delivers around 1200-1400 l/h at 100% pump power, but I would have to check again precisely this evening... If that helps as a reference, but it always depends on the pipe network connected behind.

And do you achieve the annual performance factor of 4.5 with it? Do you have a [controlled residential ventilation]?

We are hopefully approaching the goal. The energy consultant included this clause somewhere in his invoice for KFW55.



He passed this on to Vaillant, and they added blocking times from the heat pump tariffs and suddenly I ended up with the 105 heat pump. In any case, he said something about me having a heating load of 10kW, so hopefully the screenshot fits.

Of course, I idiot only sent the pipe layout and the stuff posted here. I forgot to send this standard form with the standard heating load and the actual heating load. I corrected that and he will send it to Vaillant again, and then instead of 10.x kW heating load plus blocking times, there will be a heating load specification of 6.2 (standard) or 5.78 kW WITHOUT EVU blocking times? Let’s see what comes out.

Between the lines, he even kind of apologized. He himself doesn’t want to install oversized heat pumps, but he didn’t have any other data...

It’s progressing. Not as cool as I once imagined, but better than standard!

Under the aspects: Can anyone recommend a combination of air-water heat pump + controlled residential ventilation with joint control without KNX?

For that reason, I end up with Vaillant. Although with the plan = thermal balancing, I still don't see the point in joint control of the two systems. Well, if the BAFA insists on it, then we'll just do it that way...