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
The return temperature of 32°C (90°F) at 0°C (32°F) outdoor temperature is really extreme; I didn’t even have that last winter at -20°C (-4°F). Was the bathroom and guest room completely open?
What was your electricity consumption last January and February? It was probably about double then, right?
What was your electricity consumption last January and February? It was probably about double then, right?
A
Alessandro1 Dec 2021 10:58Yes, the bathroom and guest room are always open.
Well, the 32°C (90°F) return flow and 37°C (99°F) supply flow are only maintained for a relatively "short" time in cycles when the mixing valve closes. The cold return flow coming from the underfloor heating into the buffer causes the average buffer temperature to stabilize after the heat pump adjusts.
Nevertheless, the average temperature level is already quite high, so the system defrosts fairly often and, of course, the electricity consumption is increased.
Last winter, I had completely different settings 😉
Recently, around 0°C (32°F), my consumption was about 30 kWh/day including domestic hot water, which is why I am now trying the above settings (which are recommended).
Unfortunately, without any real success...
By the way, the 5K (5°C / 9°F) buffer overheating is the customer service recommendation!
Well, the 32°C (90°F) return flow and 37°C (99°F) supply flow are only maintained for a relatively "short" time in cycles when the mixing valve closes. The cold return flow coming from the underfloor heating into the buffer causes the average buffer temperature to stabilize after the heat pump adjusts.
Nevertheless, the average temperature level is already quite high, so the system defrosts fairly often and, of course, the electricity consumption is increased.
Last winter, I had completely different settings 😉
Recently, around 0°C (32°F), my consumption was about 30 kWh/day including domestic hot water, which is why I am now trying the above settings (which are recommended).
Unfortunately, without any real success...
By the way, the 5K (5°C / 9°F) buffer overheating is the customer service recommendation!
A
Alessandro1 Dec 2021 11:23The buffer tank (thermal buffer) has a capacity of 100L (26 gallons).
Yes, 30kWh is quite a lot. It’s not worth it to me either :p
What I notice is that a lower flow rate of the circulation pump (UWP) leads to better matching between the heat pump and the underfloor heating supply.
Then the circulation pump only delivers 700 liters per hour (184 gallons per hour) at 11 watts, while the heat pump provides 1000 liters per hour (264 gallons per hour). At these settings, the supply temperatures are the same...
My compressor runs continuously at 100 Hertz (or more)...
Yes, 30kWh is quite a lot. It’s not worth it to me either :p
What I notice is that a lower flow rate of the circulation pump (UWP) leads to better matching between the heat pump and the underfloor heating supply.
Then the circulation pump only delivers 700 liters per hour (184 gallons per hour) at 11 watts, while the heat pump provides 1000 liters per hour (264 gallons per hour). At these settings, the supply temperatures are the same...
My compressor runs continuously at 100 Hertz (or more)...
Alessandro schrieb:
I come to about 700 kWh for November (200 m² (2,150 sq ft), according to the Energy Saving Ordinance
Average operating times about 3 hours How does that add up?
7.5 kW power consumption? 🤨
Similar topics