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

Pellets are just complete CO2 nonsense, regardless of the investment or operating costs.

If that is not a reason, then they are actually worthwhile at the moment.

chand1986 schrieb:

Pellets are just total CO2 nonsense, regardless of the investment/operating costs.

If that’s not a reason against them, they are actually worthwhile right now.

CO2 is not even the main issue since pellets are made from renewable wood – fine dust is the problem. Compared to that, any diesel engine has air like the North Sea.

I hope this thread stays active for a while, as I won’t be able to connect my two heat pumps for another 4-6 weeks (4-6 weeks). Then I’ll see how things look with a custom setup.

nordanney schrieb:

I hope this thread stays active for a while, as unfortunately I can only connect my two heat pumps in 4-6 weeks. Then we’ll see how it goes with a self-built system.

Certainly... unless the temperature reaches 18°C (64°F) within those 6 weeks.

stepfel schrieb:

CO2 is not even the main issue since pellets are made from renewable wood – fine dust (particulate matter) is the real problem. Compared to that, any diesel is like North Sea air.

So why does our government go along with this? I mean, the CO2 tax introduced this year doesn’t even apply to pellets. That’s really surprising.

I need your collective intelligence because I'm already so confused that I recently adjusted the water level indicator of my houseplant, mistaking it for a taco setter :p

As you know, I have connected the buffer tank in parallel with the heat pump and am using ERR more or less.
The key here is adjusting the flow rate and pressure. Everything is set on the secondary pump, which supplies the underfloor heating from the buffer tank.

When I set the flow rate and pressure according to the calculation, the temperature difference in the heating circuits is very low at 2-3°C (4-5°F), although 5°C (9°F) was calculated.
The calculation assumes a flow rate of 1300 liters per minute (34.3 gallons per minute) with a pressure of 2 meters (6.6 feet) at a 5°C (9°F) temperature difference.
The heat pump then reduces the flow rate to 800-900 liters per minute (21-24 gallons per minute) in order to maintain the 5°C (9°F) temperature difference.

The system runs most efficiently at the lowest stage with constant pressure. Here, the underfloor heating achieves a 5°C (9°F) temperature difference, and the heat pump operates at about 1000-1200 liters per minute (26-32 gallons per minute).
However, the underfloor heating only has a flow rate of 900 liters per minute (24 gallons per minute). At this point, the secondary pump consumes only 12 W and has a flow rate of 900 liters per minute (24 gallons per minute) at a pressure head of 1.8 meters (5.9 feet). That seems quite low to me.

Is a temperature difference of 2-3°C (4-5°F) in the underfloor heating desirable, or is it simply too low?
Do you have any ideas?
Would it make sense to increase the pressure at the secondary pump and throttle all heating circuits so they maintain a 5°C (9°F) temperature difference?