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

As far as I know, buffer tanks are meant to prevent or compensate for short compressor run times caused by closed ERR. It is often the case that the refrigerant also acts as a lubricant, and if the pump only runs for about 30 seconds at a time, it doesn’t get lubricated sufficiently. The buffer tank is supposed to ensure that lubrication lasts for at least 5 minutes.

I believe they mostly deal with customers who use the ERR and then report faulty compressors within the warranty period, rather than customers who choose a highly efficient heat pump as their new hobby.

At AIT/Novelan, the manufacturer also provides hydraulic diagrams without buffer tanks and mixing devices, officially and with a warranty. I don’t see why this is possible within that company group but not with Brötje, since it’s basically the same technology.

Regarding Brötje’s calculated COP: how is it determined? Does it also include the consumption of the circulation pumps? How is the heat output measured? There are many inaccurate methods, most of which are applied by heat pump manufacturers. Some calculate it solely based on power consumption relative to flow rate and other parameters. I am skeptical of the stated values at first. A COP of 5 with a supply temperature of almost 35°C (95°F) and an ambient temperature of 1.3°C (34°F) would be a super rocket pump...

Zaba12 schrieb:

But his supply temperature is 39 degrees, right? @Alessandro

Typo? At 39 degrees I almost have hot water. That can’t be right for a new build, can it?

Bookstar schrieb:

Typo? I almost have hot water at 39 degrees. That can’t be right for a new build, can it?

Come on, seriously?
I pulled it up again:

But here’s the thing! My heating curve is ridiculously high:

18°C (64°F) = 30°C (86°F) flow temperature
0°C (32°F) = 35°C (95°F) flow temperature
-15°C (5°F) = 38°C (100°F) flow temperature

I’m surprised my consumption isn’t around 35-40 kWh :p
Error mode active
Buffer tank active
Bathroom 23.2°C (74°F)
Bedroom 18.5°C (65°F) (right next to the bathroom)
Other rooms 22°C (72°F)

39 heating hours with 7 cycles.

lin0r87 schrieb:

So, summary for January:

Novela ladv 9-hsdv
156 m² (1680 sq ft) living area
Mechanical ventilation with heat recovery: Level 2 from 7 am to 8 pm; Level 1 from 8 pm to 7 am
Outdoor temperature ranged between -1 and +7°C (30°F and 45°F)
Indoor temperature steady at 23°C (73°F) throughout the house
Actuators all fully open
One meter measuring household and heat pump electricity usage

Total consumption was 730 kWh
Average daily usage = 18 kWh

It’s okay... could be a bit better

Currently temperatures are a solid -8°C (18°F).
Consumption currently around 35-40 kWh

I spent some time working on the plumbing today, let's see what comes out of it 🙂