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?
Alessandro schrieb:
You can buy IDM without hesitation, just like all heat pumps from AUT. They are considered a kind of benchmark there!They somehow manage heating well. When it comes to wood, the Austrians are also quite advanced. They also practically 'developed' the ring trench, at least the concept.
S
SaniererNRW1239 Sep 2022 16:55Alessandro schrieb:
I have already seen systems where the domestic hot water preparation with a hysteresis of about 5K takes approximately 2 hours. I just checked myself how long my 5kW (5,000 watt) air-to-water heat pump (monoblock) takes to prepare domestic hot water. Starting at 38°C (100°F), ending temperature at 51°C (124°F), with a 300-liter (79-gallon) storage tank, the heat pump run time is 45-50 minutes. So a small heat pump can actually be quite fast.
R
RotorMotor9 Sep 2022 18:10SaniererNRW123 schrieb:
I just checked myself how long my 5kW air-to-water heat pump (monoblock) takes to heat domestic hot water. Starting at 38°C (100°F), ending temperature 51°C (124°F), 300-liter (79-gallon) tank, heat pump runtime 45–50 minutes. So a small heat pump can actually be really fast. It’s very similar with ours.
At the beginning of the cycle it draws 1kW and then ramps up to just under 2kW power consumption.
Also 300 liters (79 gallons), also 45 minutes, hot water temperature 48°C (118°F).
Hello!
I installed an SLM 3-11 in our new building, which I believe is running itself to death.
The room temperature is set to 19°C (66°F) without EER, the outside temperature is currently 2°C (36°F), and the pump is running at 7.5 kW heating output!
The supply temperature is about 26°C (79°F) and the return temperature is 23°C (73°F).
Is this normal?
Best regards
I installed an SLM 3-11 in our new building, which I believe is running itself to death.
The room temperature is set to 19°C (66°F) without EER, the outside temperature is currently 2°C (36°F), and the pump is running at 7.5 kW heating output!
The supply temperature is about 26°C (79°F) and the return temperature is 23°C (73°F).
Is this normal?
Best regards
Hausmanu schrieb:
Hello!
I have installed an SLM 3-11 in our new build, which I believe is running itself to exhaustion.
Room temperature is set to 19°C (66°F) without EER, currently the outside temperature is 2°C (36°F), and the pump is running at 7.5 kW heating output!
Supply temperature is about 26°C (79°F), return temperature 23°C (73°F).
Is this normal?
Regards That doesn’t sound normal. What is your heating load? How many square meters are you heating?
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