General > General Technical Chat
What is the real story around heat pumps?
nctnico:
--- Quote from: pcprogrammer on February 22, 2024, 08:06:37 am ---
--- Quote from: Zero999 on February 21, 2024, 07:46:11 pm ---
--- Quote ---Still waiting for the second quote, but in the mean time I have found options for controlling, or at least read the De Dietrich heat pump with a RS485 interface. A lot of the info is in French, and unfortunately registering to the before mentioned site did not result in the ability to download the mentioned files. But I found a github repository with a python based solution, which gives the needed information.
--- End quote ---
Are you sure it's a good idea to get something which isn't very well documented? Going by what you've said, that company could be a pain to deal with.
--- End quote ---
I'm not afraid of a bit of research. If needed reverse engineering is a way to go. The whole thing will become a big experiment to reach a solid and economical solution.
--- End quote ---
I know this is a great project but try to keep in mind that a generic heating service person needs to be able to fix your heating system. You may go away for a while or become incapacitated. Then your wife is left in a cold home without warm water if your self-build heating system breaks. Most likely a heating service person will either go away or tear your system down and replace it with something the person knows how to deal with (followed by a large invoice).
m k:
--- Quote from: pcprogrammer on February 22, 2024, 08:06:37 am ---
--- Quote from: Zero999 on February 21, 2024, 07:46:11 pm ---
--- Quote ---Still waiting for the second quote, but in the mean time I have found options for controlling, or at least read the De Dietrich heat pump with a RS485 interface. A lot of the info is in French, and unfortunately registering to the before mentioned site did not result in the ability to download the mentioned files. But I found a github repository with a python based solution, which gives the needed information.
--- End quote ---
Are you sure it's a good idea to get something which isn't very well documented? Going by what you've said, that company could be a pain to deal with.
--- End quote ---
I'm not afraid of a bit of research. If needed reverse engineering is a way to go. The whole thing will become a big experiment to reach a solid and economical solution.
--- End quote ---
I think the only big issue you finally have is how successfully the pump is positioned.
But how big is big is questionable, obviously after the pump itself is generally fine.
Maybe you add a battery backed circulation pump no matter what.
Maybe you must later add some acoustic insulators, but so be it then, even if you must dig under the foundation, it's actually not very big qube.
(how high can engine hoist lift)
What comes to generic heating service persons around here, more experienced ones are many times very aware of many kind of specialities.
Since these things are generally pretty fine over longer periods of times these service fellas must have a wide customer base.
Around here it can include stores, dairy farms, meat packing places and so on, plus considerably old water circulations around different generations of machines.
BTW,
that earlier mentioned cold water is actually not very cold.
It's from pipes that are around a room temperature and a tap lever is usually lifted straight up, so somewhere around the middle.
Winter stream water is cold, even as cold as tap can give is not really cold, winter times it's probably close to 6C.
People who swim in ice hole would probably argue against the whole concept of cold water.
BTW2,
I had to drop HVAC target temp, the area was closing to 23C and ask was 19C.
The machine has been a bit eager from the beginning.
It's Panasonic E12 series scroll and my educated guess is that it's internal curves are too low for our temp ranges.
Maybe it's because of missing liquid, but if outdoor temps are skyrocketing or dropping equally it sometimes goes bonkers.
Then removing mains for a moment will do the trick, luckily it's indoor unit fed wall plug thing that actually has that plug.
zilp:
--- Quote from: tszaboo on February 22, 2024, 09:22:38 am ---To be pedantic, I don't really care about global warming and polar bears,
--- End quote ---
You are aware that climate change is about your survival, not about the survival of polar bears, right?
I mean, the expectation of having a reasonably heated home is perfectly reasonable, obviously. But then, exactly noone is suggesting anything otherwise, so your whole statement is pretty pointless even in that regard.
NiHaoMike:
--- Quote from: zilp on February 20, 2024, 12:26:55 pm ---
--- Quote from: Zero999 on February 20, 2024, 09:26:40 am ---Politics aside, are there heat pumps which use natural gas or oil, rather than electricity? It won't give the same COP but might be more economical. That might also suit me, although my energy usage is fairly low, so not worth it, until I need a new boiler.
--- End quote ---
Yep, there are. My understanding is that the Netherlands are betting on natural gas driven heat pumps quite a bit.
--- End quote ---
Has absorption heat pump technology improved substantially? Last I checked, it's about as efficient as running an electric heat pump from a gas generator. Might as well get a CHP generator and an electric heat pump to get more flexibility.
But as larger systems are more economical, it would work out better to split it up. Have some households with electric heat pumps and some with CHP generators. In colder weather, the CHP generators run more which nicely matches up to the heat pumps also running more.
Siwastaja:
--- Quote from: nctnico on February 22, 2024, 09:58:24 am ---I know this is a great project but try to keep in mind that a generic heating service person needs to be able to fix your heating system. You may go away for a while or become incapacitated. Then your wife is left in a cold home without warm water if your self-build heating system breaks. Most likely a heating service person will either go away or tear your system down and replace it with something the person knows how to deal with (followed by a large invoice).
--- End quote ---
This sort of stuff is usually easy to solve with some kind of manual bypass switch. Or short instructions e.g. "go to menu X and change external control to internal control". Something worth thinking about, yes.
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