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
Malz1902 schrieb:
@face26
Within 24 hours, the heat pump cycled 3 times (compressor on). At the points where the supply line dropped, the compressor continued running but defrosting was active.
Supply temperature is 35°C (95°F)
Characteristic curve slope 0.50
Characteristic curve offset 1.0 Ah, okay, that did look odd. However, it is defrosting quite often.
I’m not an optimization expert, but 35 degrees supply temperature at your still moderate outdoor temperatures... have you tried optimizing it, such as performing hydraulic balancing? Is ERR active?
@face26 A comparison was made; ERR units are installed but no longer functional. All actuators are set to manual mode and therefore remain open.
The location of the outdoor unit is not ideal; it is placed at the back of the house where it never receives sunlight.
On the front side of the house, which gets full sun exposure, the temperature is currently +2°C (36°F), while at the back it is -8°C (18°F).
The house was built according to the 2016 Energy Saving Ordinance but does not have a KfW standard.
The location of the outdoor unit is not ideal; it is placed at the back of the house where it never receives sunlight.
On the front side of the house, which gets full sun exposure, the temperature is currently +2°C (36°F), while at the back it is -8°C (18°F).
The house was built according to the 2016 Energy Saving Ordinance but does not have a KfW standard.
[QUOTE="face26, post: 471438, member: 44897"]
Well, that’s almost 40% more.
However, it really doesn’t make much sense to start a comparison between gas and an air-to-water heat pump during the coldest week of the year. 🙂
At 24 degrees Celsius (75°F) and if the entire area is fully heated, that’s already quite good. But we’ve already touched on the issue of tank rentals and 10-year contracts in new housing developments without a gas connection. If the design of the underfloor heating system is not planned for a heat pump “for use at some point,” then you will be dependent on gas forever.
From a heating technology perspective, I don’t think there is a perfect solution that allows for low investment, independence, low maintenance, and economical heating, right?
Well, that’s almost 40% more.
However, it really doesn’t make much sense to start a comparison between gas and an air-to-water heat pump during the coldest week of the year. 🙂
At 24 degrees Celsius (75°F) and if the entire area is fully heated, that’s already quite good. But we’ve already touched on the issue of tank rentals and 10-year contracts in new housing developments without a gas connection. If the design of the underfloor heating system is not planned for a heat pump “for use at some point,” then you will be dependent on gas forever.
From a heating technology perspective, I don’t think there is a perfect solution that allows for low investment, independence, low maintenance, and economical heating, right?
@Zaba12
No, of course that’s fine. I didn’t mean to suggest otherwise!
One thing is the amount of heat energy you need to bring the house up to the desired temperature. But that depends mostly on the building envelope and less on the energy source. Whether you use a heat pump or a gas boiler doesn’t make a difference in the amount of heat needed.
The other thing is how efficiently the system actually works, meaning how much heat it produces.
My comment was more general, to prevent anyone from taking the current figures as a basis for comparing the systems. Especially because I’m a bit concerned about @Bookstar, who seemed almost ready to panic thinking they might have chosen the wrong heating system. :p 😉
...Just kidding... 😀
No, of course that’s fine. I didn’t mean to suggest otherwise!
One thing is the amount of heat energy you need to bring the house up to the desired temperature. But that depends mostly on the building envelope and less on the energy source. Whether you use a heat pump or a gas boiler doesn’t make a difference in the amount of heat needed.
The other thing is how efficiently the system actually works, meaning how much heat it produces.
My comment was more general, to prevent anyone from taking the current figures as a basis for comparing the systems. Especially because I’m a bit concerned about @Bookstar, who seemed almost ready to panic thinking they might have chosen the wrong heating system. :p 😉
...Just kidding... 😀
It's not just about the heating system. I also believe that for Bookstar, it's not a single issue. It's probably the combination of many small factors.
Right now, due to significant solar gains, the temperature is 25.7°C (78.3°F) on the ground floor and 22.1°C (71.8°F) on the upper floor, while the heat pump has been running for 8.5 hours and, it feels like, will only turn on after another 3 hours because it is still 1.0°C (1.8°F) away from the threshold. Outdoor temperature is currently -5.5°C (22.1°F).
That's why I also mentioned yesterday that it will probably be too warm at Tom's place today.
Right now, due to significant solar gains, the temperature is 25.7°C (78.3°F) on the ground floor and 22.1°C (71.8°F) on the upper floor, while the heat pump has been running for 8.5 hours and, it feels like, will only turn on after another 3 hours because it is still 1.0°C (1.8°F) away from the threshold. Outdoor temperature is currently -5.5°C (22.1°F).
That's why I also mentioned yesterday that it will probably be too warm at Tom's place today.
@Zaba12 We also have 25 degrees Celsius (77°F) on the ground floor, but the heat pump is still running at full power. The target return temperature is 27.5°C (81.5°F), and the actual is 27.9°C (82.2°F). Maybe it will turn off sometime in the afternoon, we’ll see.
The problem is that we now have to ventilate the warm air out; otherwise, it gets too hot inside. At the same time, the heat pump is running. Quite absurd!
Currently, it’s still -10°C (14°F) outside here.
I recently read an article saying that most heat pumps don’t achieve a COP of 3 and are not economical. That was comforting for my criticized heating system because mine operates between 3.0 and 4.0.
@face26 oh, that was a good one!
The problem is that we now have to ventilate the warm air out; otherwise, it gets too hot inside. At the same time, the heat pump is running. Quite absurd!
Currently, it’s still -10°C (14°F) outside here.
I recently read an article saying that most heat pumps don’t achieve a COP of 3 and are not economical. That was comforting for my criticized heating system because mine operates between 3.0 and 4.0.
@face26 oh, that was a good one!
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