ᐅ Design of iDM heat pump with respect to COP (Coefficient of Performance)
Created on: 26 Aug 2022 11:21
A
Araknis
Hello.
Let’s assume a well-insulated new building with approximately 200 m² (2,150 sq ft) and a heating load of around 7 kW. So far, I have assumed that the heat pump should be appropriately sized and that oversizing it would be disadvantageous. Now, I’m looking at the datasheet of my preferred iDM heat pump, the iPump A, and I found the following:
Based on my previous understanding, the suitable model would be the iDM iPump A 2-7, which can modulate between 2.06 and 7.55 kW. The next larger model, the A 3-11, operates between 2.80 and 10.20 kW and, according to opinions I’ve heard so far, would actually be too big.
However, when I look at this table, the COP for the larger heat pump at lower loads is noticeably better than running the smaller one at full capacity. So, the larger version would be better for my situation, right?
Or am I missing something?
Let’s assume a well-insulated new building with approximately 200 m² (2,150 sq ft) and a heating load of around 7 kW. So far, I have assumed that the heat pump should be appropriately sized and that oversizing it would be disadvantageous. Now, I’m looking at the datasheet of my preferred iDM heat pump, the iPump A, and I found the following:
Based on my previous understanding, the suitable model would be the iDM iPump A 2-7, which can modulate between 2.06 and 7.55 kW. The next larger model, the A 3-11, operates between 2.80 and 10.20 kW and, according to opinions I’ve heard so far, would actually be too big.
However, when I look at this table, the COP for the larger heat pump at lower loads is noticeably better than running the smaller one at full capacity. So, the larger version would be better for my situation, right?
Or am I missing something?
No, that doesn't sound right.
Is that supposed to be the design in the attachment? 7 kW heating load? Half of it is cut off.
That already sounds like a high heating load.
But nevertheless, far too much for the temperature.
However, I’m too much of a layperson to make any assumptions.
For comparison, currently at my place, IDM ILM 2-7 for 210 m² (including basement), with an outside temperature of 2.5°C (36.5°F), supply temperature 28°C (82°F), return temperature 25°C (77°F), heating output currently at 3.5 kW. And I have about KfW 70 insulation standard.
Do you have a heating buffer tank? Mixing valve? Bypass valve?
Is that supposed to be the design in the attachment? 7 kW heating load? Half of it is cut off.
That already sounds like a high heating load.
But nevertheless, far too much for the temperature.
However, I’m too much of a layperson to make any assumptions.
For comparison, currently at my place, IDM ILM 2-7 for 210 m² (including basement), with an outside temperature of 2.5°C (36.5°F), supply temperature 28°C (82°F), return temperature 25°C (77°F), heating output currently at 3.5 kW. And I have about KfW 70 insulation standard.
Do you have a heating buffer tank? Mixing valve? Bypass valve?
Hausmanu schrieb:
Yes, according to the energy certificate, around 7 kW heating capacity.I assume you mean heating load. At what design temperature? The -5 degrees (°C) indicated – is that something different? What about my other questions?
But to make a long story short: I can only guess here as a non-expert. You have a new build... what does the heating engineer say?
A
Alessandro8 Dec 2022 08:44Your heat pump would then need to provide a flow rate of 2155 liters per hour (57 gallons per hour) for the 7.5 kW to be adequate.
A
Alessandro8 Dec 2022 09:47Are you connecting the heat pump directly to the underfloor heating, or is there a buffer tank in between?
If it is connected directly, you can add the flow rates indicated on the flow meters at the heating circuit manifold.
If it is connected directly, you can add the flow rates indicated on the flow meters at the heating circuit manifold.
Similar topics