ᐅ Air-to-Water Heat Pump: Current Consumption and Data

halmi schrieb:

Besides, you also lose the feed-in at that moment.

I have read this several times, but I don't understand the statement. I can either gain or lose one or the other. I cannot lose anything because I cannot gain it through self-consumption, and vice versa. Everything I can feed in, I cannot use myself, so I am not losing any “free kWh.”

I have a HOVAL air-to-water heat pump and the corresponding Hoval central ventilation system.
I’ve been experimenting with the settings for weeks and have now reached a fairly satisfactory result.
Heated area (ground floor, upper floor, basement) is about 360 sqm (3875 sq ft).
At a temperature of 21 degrees Celsius (70°F) in all rooms and an outside temperature of around -2 degrees Celsius (28°F), my electricity consumption is approximately 12–15 kWh per day, which I am very happy with.
I’m running an extremely low flow temperature of 23.5 degrees Celsius (74°F) and a return temperature of about 21.8 degrees Celsius (71°F), with 16 compressor starts per day.
Surprisingly, the temperature is reached in every room without solar gain (21–21.2 degrees Celsius / 70–70.2°F), except in two rooms on the upper floor.
There, I can’t quite achieve it, even though the valves are fully open. Does anyone have any advice?

23.5 degrees flow temperature? KfW 40 standard? How many square meters? And the Hoval is a modulating unit, right? Regarding your two rooms, which ones are they? Have you checked under the valve? There are always three ways to control the flow rate.

First, directly on the Taco pump itself.

Then at the valve, for which you need a square (4-sided) key.

Or the biggest problem might be that your flow rate is too low and the resistance in the pipes is too high, so you need to throttle the rooms to supply enough heat to the other two.

Chase1543 schrieb:

I have a Hoval air-to-water heat pump and the associated Hoval central ventilation system.
I’ve been adjusting the settings for weeks and have now reached a reasonably satisfactory result.
Heated area (ground floor, upper floor, basement approximately 360sqm (3875 sq ft)).
At a temperature of 21 degrees Celsius (69.8°F) in all rooms and an outside temperature of about -2 degrees Celsius (28.4°F), I have an electricity consumption of around 12-15 kWh per day, which I am very satisfied with.
I’m running an extremely low supply temperature of 23.5 degrees Celsius (74.3°F) and a return temperature of around 21.8 degrees Celsius (71.2°F), with 16 compressor starts per day.
Surprisingly, the temperature is reached in every room without sunlight (21-21.2 degrees Celsius / 69.8-70.2°F), except in two rooms on the upper floor.
There I don’t quite manage to reach it, although the valves are fully open. Does anyone have a tip?

Can you share a data file? I would like to see the 23.5°C (74.3°F) supply temperature with my own eyes. If I subtract a minimal differential of 2 K, the screed temperature is roughly at room temperature level.

I am not sure if a KFW40 house, given its size, energy consumption, and low supply temperature, actually meets the insulation standard. I believe an even higher standard is applied here. It is probably not a solid construction but rather timber frame. Perhaps the colleague can clarify this for us 🙂

The 16 compressor starts also somehow do not match the energy consumption.

It is a KFW40+ solid construction.

What can I say. I read up on it myself and experimented a lot. At first, the flow temperature was set to 31°C (88°F). That consumed a lot of electricity. Now I reach the desired temperature everywhere except for two rooms. But I will try the previous tip for those.

The heated area is approximately 360m² (3875 sq ft), and all rooms are set to 21°C (70°F).

However, to be fair about electricity consumption, no domestic hot water was used!

Unfortunately, I don’t know how to create a file. I have some photos instead: