ᐅ Cooling with a heat pump through underfloor heating?

Fuchur schrieb:

So, that means adjusting the flow rates twice a year.

We handle the passive cooling the same way. The only adjustment I make to the flow rate is reducing it in the bathroom to 1.0 l/min (0.26 gal/min) from 2.5. I do this manually. Everything else I leave as is.

konibar schrieb:

How deep?
How many pipes?

(sorry if this is a bit off-topic)

As deep and with as many pipes as needed to ensure the house stays warm in winter according to the heating load calculation.

Fuchur schrieb:

We are still looking for a solution to one issue. Since the heating circuits are set according to the hydraulic balancing, the required flow rate reverses during cooling. The bedroom has the lowest heating water demand but the highest cooling demand. This means adjusting the flow rates twice a year. Are there control valves that can hold intermediate positions?

We also have a brine heat pump with passive cooling, which we haven't used so far. I don’t even know how to set it up, but the above point has crossed my mind as well. When cooling is needed, obviously you wouldn’t want to cool the bathroom, but rather the bedroom more.

Can this not be enforced through individual room control? For example, a high setpoint temperature in the bathroom during cooling operation should reduce the flow rate. How does it work with cooling mode? How do you adjust the thermostatic radiator valves (TRVs) for cooling?

Disclaimer: I know that TRVs are not ideal, and this is usually handled by a fixed hydraulic balance. That’s what we do for heating, and our TRVs are basically redundant (but still required by regulations). Could these valves at least be used meaningfully during cooling? At least with passive cooling, any potential inefficiency due to non-optimal flow would be less of a concern.

Hangman schrieb:

Isn’t it possible to enforce this through individual room control?

Not really. Of course, you can set the target temperature very high, which means the valve stays closed permanently and no cooling occurs. But in the bedroom? Then the valve remains open all the time, but due to the low flow rate (since there is little heating demand there in winter), the cooling effect is only mild. That’s why the flow regulator must be increased there, because the radiator thermostatic valves (RTR) only allow fully open or fully closed positions.

Hangman schrieb:

How does the cooling mode work? How do you adjust the ERRs?

It’s explained in the heat pump’s manual. You switch the mode to cooling, and the RTRs adjust themselves accordingly. Of course, you need suitable ones that support this.

Hangman schrieb:

Disclaimer: I know ERRs are bad

I’m not opposed to them at all. They can even be quite useful. Ours, for example, have a display that shows the room temperature and the time 😀

Fuchur schrieb:

Ours, for example, have a display that shows the room temperature as well as the time 😀

I use that feature too 😉

You are of course right about the bedroom; there you will probably have to increase the flow manually. The bathroom and everything else should work via RTR. Now we just need summer to try it out 🙄

I have limited the bathroom flow; with the tile floor and the valve fully open, showering with cold feet isn’t ideal. But I’m a hot shower person—I need it to steam :p