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
Hello,
I have now received the calculations and noticed that the flow rate for the pump is somewhat too high (1421 vs. 1205). However, I also realized that the building services engineer planned with 16x2 pipes instead of 17x2. Does the pipe dimension also affect the required flow rate? Sorry for the possibly silly question, but I always struggled with physics and dropped the subject as soon as I could.
I have now received the calculations and noticed that the flow rate for the pump is somewhat too high (1421 vs. 1205). However, I also realized that the building services engineer planned with 16x2 pipes instead of 17x2. Does the pipe dimension also affect the required flow rate? Sorry for the possibly silly question, but I always struggled with physics and dropped the subject as soon as I could.
Okay, I just found out that the exact model is not important for the BAFA subsidy. So planning changes are possible, but the maximum funding amount cannot be changed after the first month.
With that in mind: Can anyone recommend a combination of an air-to-water heat pump plus a mechanical ventilation system with heat recovery and a shared control system without KNX? Generally, Panasonic’s Geisha is regarded as a price/performance champion for air-to-water heat pumps. Is there a compatible mechanical ventilation system with heat recovery for it?
Or conversely, Zehnder is considered the best mechanical ventilation system with heat recovery—does it have a matching heat pump?
Required specifications:
Air-to-water heat pump: 6000 W heating capacity (nominal heat load)
1421 l/h flow rate (liters per hour)
Mechanical ventilation system with heat recovery: 151 m³/h flow rate (normal) up to 196 m³/h max.
Thanks and best regards
Tolentino
With that in mind: Can anyone recommend a combination of an air-to-water heat pump plus a mechanical ventilation system with heat recovery and a shared control system without KNX? Generally, Panasonic’s Geisha is regarded as a price/performance champion for air-to-water heat pumps. Is there a compatible mechanical ventilation system with heat recovery for it?
Or conversely, Zehnder is considered the best mechanical ventilation system with heat recovery—does it have a matching heat pump?
Required specifications:
Air-to-water heat pump: 6000 W heating capacity (nominal heat load)
1421 l/h flow rate (liters per hour)
Mechanical ventilation system with heat recovery: 151 m³/h flow rate (normal) up to 196 m³/h max.
Thanks and best regards
Tolentino
So my Arotherm Split 3.5 kW (1.2 tons) outdoor unit with Unittower 58/t5 delivers about 1200-1400 liters per hour (320-370 gallons per hour) at 100% pump capacity. I would have to check again this evening for exact numbers... Just to give a rough idea, but it always depends on the piping system and what is connected behind it.
We are hopefully approaching the goal. The energy consultant included this passage somewhere in his calculation for the KFW55.
He passed this on to Vaillant, and they added additional restriction periods from the heat pump tariffs, and suddenly I ended up with the 10.5 kW heat pump. Anyway, he mentioned something about me having a heating load of 10 kW, so hopefully this screenshot is relevant.
Of course, I only sent the installation plan and the things posted here. I forgot to send this standard form with the standard heating load and the actual heating load. I have corrected that, and he will now send it to Vaillant again, so instead of a 10.x kW heating load plus restriction periods from the utility, we might get a heating load specification of 6.2 kW (standard) or 5.78 kW WITHOUT utility restriction periods. Let’s see what comes out.
Between the lines, he even seemed to apologize. He doesn’t want to install oversized heat pumps himself, but he didn’t have any other data...
It’s getting there. Not as great as I imagined, but better than the standard!
He passed this on to Vaillant, and they added additional restriction periods from the heat pump tariffs, and suddenly I ended up with the 10.5 kW heat pump. Anyway, he mentioned something about me having a heating load of 10 kW, so hopefully this screenshot is relevant.
Of course, I only sent the installation plan and the things posted here. I forgot to send this standard form with the standard heating load and the actual heating load. I have corrected that, and he will now send it to Vaillant again, so instead of a 10.x kW heating load plus restriction periods from the utility, we might get a heating load specification of 6.2 kW (standard) or 5.78 kW WITHOUT utility restriction periods. Let’s see what comes out.
Between the lines, he even seemed to apologize. He doesn’t want to install oversized heat pumps himself, but he didn’t have any other data...
It’s getting there. Not as great as I imagined, but better than the standard!
Tolentino schrieb:
From the perspective of efficiency: Can anyone recommend a combination of an air-to-water heat pump with controlled mechanical ventilation using a common control system that does not involve KNX? That’s why I’m leaning towards Vaillant. However, when it comes to the plan = hydraulic balancing, I still don’t see the point in having a shared control system for both units. Well, if BAFA insists on it, we’ll just have to do it that way...
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