ᐅ Single-family house – 18,000 kWh in two years – what could be the issue?
Created on: 17 Aug 2020 16:38
T
titoz
Hello everyone,
I need to reach out to the forum because I would like to get your opinions and advice.
We (2 adults with 2 small children) have been living for two years in a single-family house with a self-contained apartment (Einliegerwohnung). This apartment has been rented out for one year (2 adults with a baby).
Our house is equipped with a ground source heat pump (Nibe 1245 PC). It provides hot water, heating, and passive cooling through the underfloor system.
The main electricity meter shows 18,000 kWh.
This seems extremely high to me, and I cannot figure out where such consumption could come from.
Could the meter from the energy supplier be faulty?
Could a device, for example the heat pump, refrigerator, stove, etc., be malfunctioning and therefore drawing more electricity?
I am still quite puzzled.
Best regards
I need to reach out to the forum because I would like to get your opinions and advice.
We (2 adults with 2 small children) have been living for two years in a single-family house with a self-contained apartment (Einliegerwohnung). This apartment has been rented out for one year (2 adults with a baby).
Our house is equipped with a ground source heat pump (Nibe 1245 PC). It provides hot water, heating, and passive cooling through the underfloor system.
The main electricity meter shows 18,000 kWh.
This seems extremely high to me, and I cannot figure out where such consumption could come from.
Could the meter from the energy supplier be faulty?
Could a device, for example the heat pump, refrigerator, stove, etc., be malfunctioning and therefore drawing more electricity?
I am still quite puzzled.
Best regards
tomtom79 schrieb:
I know I understood it, so I will call an electrician to separate both apartments and then apply for a second meter.
It was only a calculation and that seems fine so far.
But 45,000 kWh of heat energy is a lot; I don’t even use that after 5 years and I have 250 m² (2700 ft²).
Okay, let’s summarize
How large are the heated areas?
What temperature is the hot water set to?
How big is the hot water storage tank?
What is the supply temperature?The 45,000 kWh included the drying phase and even the first winter, which was completely covered by additional electric heating.
The problem back then was that nobody took responsibility to start the normal “brine operation.” What a hassle that was...
To your questions...
Heated areas… just quickly recalculated:
Secondary apartment: 68 m² (730 ft²)
Our living unit: 140 m² (1507 ft²)
Hot water was set to:
Start 46°C (115°F)
Stop 50°C (122°F)
It has now been adjusted to:
Start 42°C (108°F)
Stop 46°C (115°F)
Domestic hot water tank: 180 L (48 gallons)
Regarding the supply temperature, I don’t know where to read it right now.
In the service info it says:
Domestic hot water preparation BT6: 47.1°C (117°F)
Domestic hot water upper part BT7: 51.4°C (124.5°F)
Calculated supply temperature 1: 20°C (68°F)
So, I’ll write down everything I could extract from the service info:
1/16 Status EB100
Priority setting: Cooling
Domestic hot water BT6: 47.1 °C (116.8 °F)
Domestic hot water upper BT7: 51.4 °C (124.5 °F)
Calculated flow temperature: 20 °C (68 °F)
Degree minutes: 0
Outdoor temperature BT1: 30.2 °C (86.4 °F)
Cooling circuit supply BT10: 17.1 °C (62.8 °F)
Cooling circuit return BT11: 19.7 °C (67.5 °F)
2/16 Climate control system 1 EB100
Flow temperature 1 BT2: 20.3 °C (68.5 °F)
Return temperature 1 BT3: 22.3 °C (72.1 °F)
Calculated flow temperature 1: 20 °C (68 °F)
Room temperature BT50: -
External flow temperature BT25: -
Degree minutes: 0
External adjustment: No
Floor drying: off
3/16 EB100
Average outdoor temperature: 27.7 °C (81.9 °F)
Hot gas BT14: 47.6 °C (117.7 °F)
Liquid line BT15: 19.6 °C (67.3 °F)
Suction gas BT17: 35.7 °C (96.3 °F)
Cooling circuit return BT11: 19.7 °C (67.5 °F)
Condenser flow BT12: 19.5 °C (67.1 °F)
Flow temperature BT2: 20.3 °C (68.5 °F)
Return temperature BT3: 22.3 °C (72.1 °F)
4/16 EB100
Heat carrier pump speed GP1: 100%
Heat pump circulation pump speed GP2: 75%
5/16 EB100
Internal auxiliary heating status: blocked
Max. set current flow: 2 kW
Fuse size: 25 A
Current L1: 0 A
Current L2: 0 A
Current L3: 0 A
Degree minutes: 0
6/16 Time control EB100
Domestic hot water: off
Heating: off
Cooling: off
Ventilation: active
Control scheme blocking: off
Holiday mode: off
SG Ready: not used
7/16 Soft inputs/outputs EB100-AA3
AUX1: Tariff blocking (0)
AUX2: not used
AUX3: not used
AUX4: not used
AUX5: not used
X7: DHW circulation (0)
8/16 Heat meter BF1 EB100
Heating, compressor only: 28,642 kWh
DHW, compressor only: 7,045 kWh
Heat, including internal auxiliary heating: 45,637 kWh
DHW, including internal auxiliary heating: 7,873 kWh
BF1 flow rate: 18.4 l/min (4.86 gal/min)
9/16 Integrated passive cooling EQ1
External blocking: No
Calculated flow temperature: 20.0 °C (68 °F)
Cooling/heating sensor BT74: - °C
10/16 FLM AZ1
FLM pump: off
Collector inlet BT26: 16.4 °C (61.5 °F)
Collector outlet BT27: 19.3 °C (66.7 °F)
Exhaust air BT20: 26.9 °C (80.4 °F)
Supply air BT21: 18.8 °C (65.8 °F)
Cooling: off
Version: 9
11/16 FLM AZ2
FLM pump: off
Collector inlet BT26: 22.3 °C (72.1 °F)
Collector outlet BT27: 26.2 °C (79.2 °F)
Exhaust air BT20: 27.3 °C (81.1 °F)
Supply air BT21: 26.1 °C (79.0 °F)
Cooling: off
Version: 9
15/6 Config EB100
Compressor: Bristol 10 kW
Inc. power: 3x 400 V
Internal auxiliary heating: 7/9 kW
Heat medium pump: Grundfos UPM2 25-70
Brine pump: Grundfos UPMXL Geo 25-105
Flow sensor: Huba DN20
Electric anode: Magnotex
Display type: 0
COMPRESSOR INFO
Master
Status: off
Number of starts: 11,710
Total operating time: 3,353 h
- of which domestic hot water: 908 h
AUXILIARY HEATING INFO
Status: blocked
Time factor: 2,243
- of which domestic hot water: 105.9
PRIORITY SETTINGS:
Domestic hot water: 30 min
Heating: 30 min
DEGREE MINUTES SETTING:
Current value: 0 GM
Compressor start: -80 GM
Auxiliary heating start differential: 100 GM
Differential between heating stages: 50 GM
MAXIMUM DIFFERENCE Flow temperature:
Max. compressor differential: 10 °C (18 °F)
Max. auxiliary heating differential: 7 °C (12.6 °F)
Is anything missing? Let me know, I’d rather give you everything you need.
1/16 Status EB100
Priority setting: Cooling
Domestic hot water BT6: 47.1 °C (116.8 °F)
Domestic hot water upper BT7: 51.4 °C (124.5 °F)
Calculated flow temperature: 20 °C (68 °F)
Degree minutes: 0
Outdoor temperature BT1: 30.2 °C (86.4 °F)
Cooling circuit supply BT10: 17.1 °C (62.8 °F)
Cooling circuit return BT11: 19.7 °C (67.5 °F)
2/16 Climate control system 1 EB100
Flow temperature 1 BT2: 20.3 °C (68.5 °F)
Return temperature 1 BT3: 22.3 °C (72.1 °F)
Calculated flow temperature 1: 20 °C (68 °F)
Room temperature BT50: -
External flow temperature BT25: -
Degree minutes: 0
External adjustment: No
Floor drying: off
3/16 EB100
Average outdoor temperature: 27.7 °C (81.9 °F)
Hot gas BT14: 47.6 °C (117.7 °F)
Liquid line BT15: 19.6 °C (67.3 °F)
Suction gas BT17: 35.7 °C (96.3 °F)
Cooling circuit return BT11: 19.7 °C (67.5 °F)
Condenser flow BT12: 19.5 °C (67.1 °F)
Flow temperature BT2: 20.3 °C (68.5 °F)
Return temperature BT3: 22.3 °C (72.1 °F)
4/16 EB100
Heat carrier pump speed GP1: 100%
Heat pump circulation pump speed GP2: 75%
5/16 EB100
Internal auxiliary heating status: blocked
Max. set current flow: 2 kW
Fuse size: 25 A
Current L1: 0 A
Current L2: 0 A
Current L3: 0 A
Degree minutes: 0
6/16 Time control EB100
Domestic hot water: off
Heating: off
Cooling: off
Ventilation: active
Control scheme blocking: off
Holiday mode: off
SG Ready: not used
7/16 Soft inputs/outputs EB100-AA3
AUX1: Tariff blocking (0)
AUX2: not used
AUX3: not used
AUX4: not used
AUX5: not used
X7: DHW circulation (0)
8/16 Heat meter BF1 EB100
Heating, compressor only: 28,642 kWh
DHW, compressor only: 7,045 kWh
Heat, including internal auxiliary heating: 45,637 kWh
DHW, including internal auxiliary heating: 7,873 kWh
BF1 flow rate: 18.4 l/min (4.86 gal/min)
9/16 Integrated passive cooling EQ1
External blocking: No
Calculated flow temperature: 20.0 °C (68 °F)
Cooling/heating sensor BT74: - °C
10/16 FLM AZ1
FLM pump: off
Collector inlet BT26: 16.4 °C (61.5 °F)
Collector outlet BT27: 19.3 °C (66.7 °F)
Exhaust air BT20: 26.9 °C (80.4 °F)
Supply air BT21: 18.8 °C (65.8 °F)
Cooling: off
Version: 9
11/16 FLM AZ2
FLM pump: off
Collector inlet BT26: 22.3 °C (72.1 °F)
Collector outlet BT27: 26.2 °C (79.2 °F)
Exhaust air BT20: 27.3 °C (81.1 °F)
Supply air BT21: 26.1 °C (79.0 °F)
Cooling: off
Version: 9
15/6 Config EB100
Compressor: Bristol 10 kW
Inc. power: 3x 400 V
Internal auxiliary heating: 7/9 kW
Heat medium pump: Grundfos UPM2 25-70
Brine pump: Grundfos UPMXL Geo 25-105
Flow sensor: Huba DN20
Electric anode: Magnotex
Display type: 0
COMPRESSOR INFO
Master
Status: off
Number of starts: 11,710
Total operating time: 3,353 h
- of which domestic hot water: 908 h
AUXILIARY HEATING INFO
Status: blocked
Time factor: 2,243
- of which domestic hot water: 105.9
PRIORITY SETTINGS:
Domestic hot water: 30 min
Heating: 30 min
DEGREE MINUTES SETTING:
Current value: 0 GM
Compressor start: -80 GM
Auxiliary heating start differential: 100 GM
Differential between heating stages: 50 GM
MAXIMUM DIFFERENCE Flow temperature:
Max. compressor differential: 10 °C (18 °F)
Max. auxiliary heating differential: 7 °C (12.6 °F)
Is anything missing? Let me know, I’d rather give you everything you need.
10/16 FLM AZ1
FLM pump: off
Collector inlet BT26: 16.4°C (61.5°F)
Collector outlet BT27: 19.3°C (66.7°F)
Exhaust air BT20: 26.9°C (80.4°F)
Supply air BT21: 18.8°C (65.8°F)
Cooling: off
Version: 9
11/16 FLM AZ2
FLM pump: off
Collector inlet BT26: 22.3°C (72.1°F)
Collector outlet BT27: 26.2°C (79.2°F)
Exhaust air BT20: 27.3°C (81.1°F)
Supply air BT21: 26.1°C (79.0°F)
Cooling: off
Version: 9The temperatures here seem a bit unusual. Device 1 shows a significant difference (8°C / 14.4°F) between exhaust air and supply air. As I understand it, a substantial amount of heat is being extracted from the warm exhaust air. But why isn’t this the case with FLM 2? There, the supply air is only about 1°C (1.8°F) cooler than the exhaust air.
Okay, a lot is going wrong here.
You should have reconsidered the additional costs caused by the electric heating element.
I see 11,000 compressor starts, which is bad, very bad.
What are the hysteresis values for domestic hot water and heating?
Is this really a 10 kW (34,100 BTU/h) heating system?
Have you adjusted your underfloor heating?
You need a different forum for this, I’m not allowed to mention the name or I might get banned here.
You should have reconsidered the additional costs caused by the electric heating element.
I see 11,000 compressor starts, which is bad, very bad.
What are the hysteresis values for domestic hot water and heating?
Is this really a 10 kW (34,100 BTU/h) heating system?
Have you adjusted your underfloor heating?
You need a different forum for this, I’m not allowed to mention the name or I might get banned here.
tomtom79 schrieb:
Okay, a lot is going wrong here.
You should have calculated the additional costs for the electric heating element again.
I see 11,000 compressor starts, which is bad, very bad.
What are the hysteresis values for domestic hot water and heating?
Is this really a 10 kW heater?
Have you adjusted your underfloor heating?
You need a different forum for this; I’m not allowed to mention the name here or I’ll get banned.Well, it’s actually a good sign that a lot is going wrong. Then things can only get better.
So, the model is F1245-10 PC. I think the ’10’ stands for 10 kW.
What do you mean by “adjusted the underfloor heating”?
In my unit, I don’t have thermostats; ELF does.
But currently, the underfloor heating is running in cooling mode.
@tomtom79: sun-d(at)gmx.net
titoz schrieb:
Something seems a bit unusual with the temperature readings here. Device 1 shows a large difference (8°C (14°F)) between exhaust air and outdoor air. As I understand it, a significant amount of heat is being extracted from the warm exhaust air.
But why isn’t this the case with HRV 2? There, the outdoor air is only 1°C (2°F) cooler than the exhaust air? Okay, it looks like I hadn’t turned on the circulation pump of one of the HRVs.
Let’s see if the data changes now.
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