ᐅ Heat Pump Energy Consumption in 2019 on a Monthly Basis

Created on: 27 Nov 2019 10:44
B
Bookstar
I would like to start a new comparison thread and learn about your energy consumption. I am not completely satisfied with mine.

KFW55
Heated area 200 m2 (2,150 sq ft), underfloor heating
Standard rooms 19°C (66°F), living areas 22°C (72°F), bathroom 23°C (73°F)
Air-to-water heat pump with centralized controlled ventilation system
Domestic hot water temperature 50°C (122°F)


Data collection unfortunately only since April 2019:






























April
407
May
347
June
109
July
131
August
144
September
198
October
356


I will update the table monthly. November will be included soon, with an estimated 650 kWh.
M
michert
27 Nov 2019 18:30
I initially set all valves to the highest setting and later, once everything was working properly, switched all circuits in the heating manifold to manual open.
B
boxandroof
27 Nov 2019 18:31
Set all ERR settings to 5 and deactivate or remove them later. To prevent overheating, you also need to lower the heating curve at the same time.

To achieve the desired temperature in each room, you must either open or throttle the circuits at the manifold. Open them more than you throttle to ensure sufficient flow. Look up “thermal balancing” or “hydraulic balancing” online. It takes about 2-3 weeks for everything to be properly adjusted. Now is the right weather to make these adjustments. This process will also show how well the heating surfaces were planned.
tomtom7927 Nov 2019 18:39
For example, I have not yet carried out the hydraulic balancing; it was calculated and adjusted by Schwörerhaus. But this refers to the flow rate at the manifold, correct?
B
Bookstar
27 Nov 2019 18:44
boxandroof schrieb:

Set all ERR to 5 and deactivate or remove them later. To prevent overheating, you need to lower the heating curve at the same time.

To achieve the desired temperature in each room, you have to open or throttle the circuits at the manifold. Open more than you throttle to ensure sufficient flow. Search online for thermal or hydraulic balancing. It takes 2-3 weeks until everything is adjusted properly. Now is the right weather to make these settings. This process will also reveal how well the heat emitters were planned.

Thank you! I have been reading nothing else for two days, but much of it is very theoretical.

For an unused child’s room or bedroom, do you reduce the flow a bit directly at the heating manifold? Should all other rooms except the bathroom be set to the same temperature?

Can I leave Sanibel actuators manually open permanently, so that the electricity consumption is eliminated?
B
boxandroof
27 Nov 2019 19:00
Bookstar schrieb:

Do you reduce the heating directly at the manifold for an unused children's room or bedroom? All other rooms except the bathroom have the same temperature.
Heat unused rooms or corridors slightly; otherwise, the supply temperature for the adjacent rooms needs to be higher, which we want to avoid.

Keep the other rooms as warm as possible. It depends on the design of the underfloor heating system, which we do not know. Often, the heating surface in the bathroom is too small and it is also supposed to be especially warm there. In that case, you have to reduce the flow in all other rooms and increase the supply temperature only for the bathroom, or live with 1-2 degrees less in the bathroom. When balancing the system, you will notice in which rooms the underfloor heating is properly sized.

Important: reduce small heating circuits relatively strongly. It also helps to measure the return temperatures with a simple IR thermometer and adjust accordingly.
G
guckuck2
27 Nov 2019 19:14
It is particularly inefficient to want to heat small rooms to a very high temperature, which requires a high flow temperature to be set, while the other rooms are throttled by the ERR because they are supposed to remain cooler. The heat pump becomes less efficient due to the higher flow temperature, and the heating pump works against closed valves. Not ideal.