J1mbo Posted November 20, 2020 Share Posted November 20, 2020 I do, but it's R290 and this type of ASHP doesn't need immersion at least at "normal" outside temperatures. Link to comment Share on other sites More sharing options...
SteamyTea Posted November 20, 2020 Share Posted November 20, 2020 Just now, J1mbo said: I do, but it's R290 and this type of ASHP doesn't need immersion at least at "normal" outside temperatures. What temperature does it heat your cylinder (using this as a catchall term) to? Link to comment Share on other sites More sharing options...
J1mbo Posted November 20, 2020 Share Posted November 20, 2020 Normal set point is 55*C. Weekly boost to 70*C for legionnaires control. All compressor driven. Link to comment Share on other sites More sharing options...
SteamyTea Posted November 20, 2020 Share Posted November 20, 2020 6 minutes ago, J1mbo said: Normal set point is 55*C. Weekly boost to 70*C for legionnaires control. Pretty good. I keep meaning to look (relearn) the formula for working it all out for different gasses, and then wonder why we don't use water as the refrigerant. It has such good figures for fusion and vaporisation compared to almost everything else. Link to comment Share on other sites More sharing options...
J1mbo Posted November 20, 2020 Share Posted November 20, 2020 Some R290 info is here: https://www.gas-servei.com/shop/docs/technical-data-sheet-r-290-gas-servei.pdf Link to comment Share on other sites More sharing options...
SteamyTea Posted November 20, 2020 Share Posted November 20, 2020 (edited) 5 minutes ago, J1mbo said: Some R290 info Can see why they use it, nothing is scary about it, like Goldilocks. Water does have a latent heat of 2257 though Edited November 20, 2020 by SteamyTea Link to comment Share on other sites More sharing options...
ProDave Posted November 20, 2020 Share Posted November 20, 2020 35 minutes ago, SteamyTea said: Has anyone running a heat pump, close to the maximum to get a higher water temperature, actually checked to see if the built in immersion heater is kicking in? I disabled mine in the setup. Link to comment Share on other sites More sharing options...
J1mbo Posted November 20, 2020 Share Posted November 20, 2020 57 minutes ago, SteamyTea said: Pretty good. I keep meaning to look (relearn) the formula for working it all out for different gasses, and then wonder why we don't use water as the refrigerant. It has such good figures for fusion and vaporisation compared to almost everything else. Interesting thought. I found this explanation: "The main problem with using water as a refrigerant lies in the compression stage of the refrigeration cycle. One desirable property of a refrigerant is that it should have a low boiling point. In order to lower the boiling point of water, we need to subject it to extremely low pressures. These pressures cannot be obtained with a conventional compressor and also water creates such a volume of vapor that the compressor needed would be huge. Even if we managed to design such a compressor, it would take a lot of energy to get it down to such low vacuum pressures that the refrigeration system would end up being inefficient. Water is as such an inefficient refrigerant because it requires too much power to make any sort of refrigeration happen." Link to comment Share on other sites More sharing options...
SteamyTea Posted November 20, 2020 Share Posted November 20, 2020 2 minutes ago, J1mbo said: Interesting thought. I found this explanation: Good explanation. Water is also 'the universal solvent'. I have often wondered what lubrucants are in normal heat pumps. Must be pretty robust as fridges can last decades. Link to comment Share on other sites More sharing options...
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