ᐅ Design of iDM heat pump with respect to COP (Coefficient of Performance)
Created on: 26 Aug 2022 11:21
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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?
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Alessandro7 Sep 2022 12:29It’s just like with cars. Everyone can drive at 100 km/h (62 mph). A car with more power under the hood simply needs less time to get there than one with less horsepower.
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SaniererNRW1237 Sep 2022 12:52Alessandro schrieb:
The smaller the heat pump, the longer it takes. I’ve seen systems where the domestic hot water preparation with a hysteresis of about 5k takes around 2 hours.Alessandro schrieb:
They can all go 100 km/h (62 mph). The car with more power under the hood just needs less time to get there than the one with less horsepower 😉I can’t think of any heat pump off the top of my head that is so poor—just to keep the comparison—that you could call it like a bicycle on the highway. A small heat pump, as an air-to-water system, is usually a 5 kW unit (90%). And those all handle up to 60°C (140°F) and high flow rates quite well. If there’s an issue, it’s usually caused by incorrect design, pipe routing, or pipe diameter, etc.G
Gecko19278 Sep 2022 08:47For the Ipump from IDM, both the large and small models use the same storage tank, which means it simply takes longer for the larger one to heat up.
180 liters (48 gallons) sounds like a lot, but you can’t fully use this capacity since otherwise there would only be cold water left in the tank. Additionally, losses from circulation, for example, naturally cause the water to cool down.
Based on my experience, I would personally advise completely against IDM. In two years, I had customer service at my house more often than my neighbors did with their oil heating systems over 15 years.
180 liters (48 gallons) sounds like a lot, but you can’t fully use this capacity since otherwise there would only be cold water left in the tank. Additionally, losses from circulation, for example, naturally cause the water to cool down.
Based on my experience, I would personally advise completely against IDM. In two years, I had customer service at my house more often than my neighbors did with their oil heating systems over 15 years.
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Alessandro8 Sep 2022 08:56why was the builder there?
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Alessandro9 Sep 2022 08:44You can safely buy IDM, just like all heat pumps from AUT. They are considered a benchmark there!
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