Hello!
I'll start.
Heated area 200m2 (2,153 sq ft)
KfW 55 standard
Mechanical ventilation with heat recovery
Current outdoor temperature 6°C (43°F)
Heating energy consumption including hot water 35 kWh
Electricity consumption 9 kWh
COP 3.88
I'll start.
Heated area 200m2 (2,153 sq ft)
KfW 55 standard
Mechanical ventilation with heat recovery
Current outdoor temperature 6°C (43°F)
Heating energy consumption including hot water 35 kWh
Electricity consumption 9 kWh
COP 3.88
T
T_im_Norden9 Jan 2021 18:01@Zaba12
There might still be some margin.
While 5 K is acceptable, heat pumps often operate with less.
There might still be some margin.
While 5 K is acceptable, heat pumps often operate with less.
T_im_Norden schrieb:
@Zaba12
There might still be some room for adjustment.
While a 5 K temperature difference is okay, heat pumps often operate with less. My heat pump has never shown a 4.x K temperature difference in heating mode. I’m curious to see the next heating cycle. But it seems I can now only regulate the indoor temperature via the heating curve, not by adjusting the flow rate, otherwise the problem will start over. From my point of view, this severely limits the ability to adjust the temperature of individual rooms. The mixing valve doesn’t help either because the 3 radiators with 0.5 l/min flow already generate 22°C (72°F).
I could still increase the office flow from 1.25 to 1.75 l/min (liters per minute). But that would be it. Then, without the mixing valve, I would have 1380 l/h (liters per hour) flow. The nominal capacity is 1600 l/h.
This was the disastrous day today and yesterday, and the reference day of 05.01 for the "perfectly running" heat pump.
T
T_im_Norden9 Jan 2021 19:42Usually, this is done exactly like that.
Open all heating circuit valves, then lower the heating curve until the reference room becomes too cold, and then increase it by one step.
Only when this is correct do you proceed with throttling.
Open all heating circuit valves, then lower the heating curve until the reference room becomes too cold, and then increase it by one step.
Only when this is correct do you proceed with throttling.
T_im_Norden schrieb:
Normally, you do it exactly like that.
Open all radiators completely, then lower the heating curve until the reference room gets too cold, and then raise it one step back.
Only when that fits do you start throttling. Okay, apparently I haven’t managed that in the last three weeks, and I’ve tried a lot of things.
My problem is more that the ground floor is always 2–3°C (3.6–5.4°F) warmer than the upstairs bathroom, where the flow rate is already at 3 liters per minute (0.8 gallons per minute). So, upstairs bathroom is at 21.5°C (70.7°F), and the ground floor is at 23.5–24°C (74.3–75.2°F). The issue now is that I need the full flow rate on the ground floor; otherwise, it doesn’t work out. Oh, and upstairs, the bedroom and office will end up at around 22.5°C (72.5°F), and the kids’ rooms will be at 20.5°C (68.9°F) with the current flow rates. That’s why everything was set so low in the first place—to prevent those rooms from getting too hot.
T
T_im_Norden9 Jan 2021 20:15Where are you from?
Did you start with a fully open heating control valve?
Which room do you want to use as a reference?
Upstairs bathroom?
It's best to create a separate thread for this to check it properly.
Did you start with a fully open heating control valve?
Which room do you want to use as a reference?
Upstairs bathroom?
It's best to create a separate thread for this to check it properly.
T_im_Norden schrieb:
I don't have it in my head, but how large was your house and which KfW type?
28 kW is over 80 kWh of heat, I think that's a lot. It’s a KFW55 with controlled mechanical ventilation and 180 m² (about 1,940 sq ft) plus a basement. The basement is heated halfway. The heat amount is around 90 kWh per day, measured from the heat pump meter of the system.
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