General > General Technical Chat
What is the real story around heat pumps?
coppice:
--- Quote from: pcprogrammer on February 26, 2024, 08:09:51 pm ---
--- Quote ---The bigger ones, say over 5kW claimed output, are better (more reliable) with a 3 phase compressor.
--- End quote ---
Is there a difference in life expectancy and reliability between tri phase and single phase models?
For what I have seen of the De Dietrich models there is no difference in price between them. Don't know about other brands.
--- End quote ---
Unless you have a bargain basement heat pump, why would three or single phase power make any difference? They are all inverter driven these days. Is this single vs 3 phase issue related to old heat pumps? I can definitely see a three phase induction motor giving better results.
nctnico:
--- Quote from: pcprogrammer on February 26, 2024, 08:09:51 pm ---
--- Quote ---The bigger ones, say over 5kW claimed output, are better (more reliable) with a 3 phase compressor.
--- End quote ---
Is there a difference in life expectancy and reliability between tri phase and single phase models?
--- End quote ---
I think the difference expressed is between on/off compressor versus variable frequency inverter driven compressors. Nowadays you will want an inverter driven heatpump as these are quieter under light loads. Also make sure to buy a unit with a rotary compressor as these produce way less vibrations.
The outdoor unit I have from Panasonic has both and it sits on a sloped roof with a wooden construction. I have to listen very carefully to hear it from directly under the roof. But I have to say that I mounted it on extra shock absorbers.
tszaboo:
--- Quote from: pcprogrammer on February 26, 2024, 07:48:57 pm ---Still waiting for the second set of quotes. I'm very curious as to what they are going to offer for air to water in terms of output power, and what the price will be for the complete job.
--- End quote ---
Reading through your situ., I think the air to water heatpump probably makes the most sense. Especially since you have most of your house prepared for it.
Someone:
--- Quote from: pcprogrammer on February 26, 2024, 08:09:51 pm ---
--- Quote ---The bigger ones, say over 5kW claimed output, are better (more reliable) with a 3 phase compressor.
--- End quote ---
Is there a difference in life expectancy and reliability between tri phase and single phase models?
--- End quote ---
I know someone with an older 3-phase unit that was destroyed during a phase drop, but modern inverter units probably dont have that vulnerability.
tom66:
Pretty much every heat pump now, even with a single phase input, will be using a three phase compressor because they will use an brushless or induction motor and inverter to drive that motor. That will probably be immune to losing a phase (will likely cause the unit to shut off though if it has any monitoring of the AC line.)
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