Air-water heat pump current consumption and data

  • Erstellt am 2020-09-29 11:06:43

teh_M

2021-02-10 08:59:42
  • #1
the thing with the energy certificate is a tricky one, I also had long talks with the energy consultant and eventually gave up. For me, the final energy demand is 47kwh/sqm including auxiliary energy (so with hot water). But that is the amount of heat I need (since district heating is my energy source). For you, according to the energy consultant, the electricity consumption is stated... total nonsense in terms of comparability.

If you have 25kwh/sqm, then you have to consider the COP... so 25kwh * 4 cop = 100kwh heat per sqm, at 200sqm you are at 20,000kwh.

For me it is 47kwh heat * 150sqm = 7000 kWh heat per year. That fits.

For Zaba, I think it was 10kWh/sqm? With a COP of 4.x, it is also close to my heat amount and the consumption data match quite well.
 

Alessandro

2021-02-10 09:11:38
  • #2


Of course I have. The house simply needs the energy that the house needs. If I had all the ERRs permanently open, I would constantly have a temperature difference of 2-3K between the heat pump flow and the underfloor heating flow through the buffer. Only when some circuits are closed by the ERR do the flow rates adjust so that the flow temperatures match; I give the bathroom more flow and thus reach just over 23°C.

My heat pump is also return-controlled and always calculates the flow as return + differential (5K). So if return = 28°C, then flow = 33°C. If the return rises, the flow rises in parallel. The compressor modulates the flow so that the differential of 5K remains constant, which is why I never get above 1000l flow from the heat pump. It drifts around 5kW output even at an outdoor temperature of -12°C :rolleyes: That’s also why my issue is with the low differential in the heating circuits and whether it wouldn’t be better to keep them at 5K as well, so the heat pump can run at its nominal flow...
 

Bookstar

2021-02-10 09:14:00
  • #3
I have now dug out old documents again. There are actually calculations for everything.

Heat load calculation: 8.3 KW
Design flow temperature: 35 degrees
Return flow: 28 degrees
Flow rate: 1000 liters / h
Standard outside temperature: -16 degrees
Average: 7 degrees

I just set the pump testwise to -16 degrees design, then the return flow target is 29 degrees. That would be almost a perfect match.
 

Daniel-Sp

2021-02-10 09:19:42
  • #4
The interpretation is obviously nonsense for a heat pump...
 

Daniel-Sp

2021-02-10 09:22:58
  • #5
Then it always runs at full compressor capacity, so the electrical power consumption must always be the same, only the heat output at the back varies depending on the outside temperature. The daily consumption is determined solely based on the runtime.
 

Zaba12

2021-02-10 09:30:03
  • #6

I didn’t say anything else. And with that, the running time = consumption in my case only depends on the outside temperature, roughly speaking.

Leaving the topic of insulation aside.
 

Similar topics
28.08.2013New single-family house, gas or heat pump, target KfW5529
19.05.2021Experiences with brine heat pump491
14.10.2017Heat pump flow temperature experiences?13
30.12.2017Heating system new construction (heat pump + stove + solar)35
17.04.2018Heat pump domestic water storage tank - What size is recommended?12
22.11.2019Feedback on heat pump / offer requested!46
12.01.2021Underfloor heating air-water heat pump. House too warm when the sun shines690
20.12.2019Difference in purchase cost between gas pump or heat pump74
19.03.2021Combine air-water heat pump with water-carrying wood stove57
20.11.2020Air-water heat pump flow temperatures34
17.07.2021Underfloor heating and air-to-water heat pump in new construction: am I going to have problems?28
11.10.2021Actuators are open but no flow13
12.11.2021Underfloor heating and heat pump. I thought I understood it15
08.12.2022Interpretation of iDM heat pump regarding COP32
24.11.2023Heat pump: buffer tank, capacity and modulation46
11.11.2023Heat pump in the transition period34
13.02.2024Heat pump is not compatible with a water-bearing fireplace144

Oben