Dan Feist

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  1. This is the Zehnder explanation. https://www.zehnder.co.uk/products-and-systems/heating-and-cooling-ceiling-systems/benefits/system-comparison
  2. Saw then working, but really hard to tell how effective they are without having them installed at home. The theory is interesting, about how you save on heating because you don't need to heat the air temperature so much! That said we weren't keen on the need for expansion gaps at the edge of cieling.
  3. Hi and Welcome, We've just made this decision a couple of weeks ago. Rather than tell you who we decided to use, it's worth first mentioning what considerations/questions we asked oursevles as part of the decision making process I think: 1) Do you want supply and erection, or are you happy to use someone else locally for erection? 2) Do you want timber-frame supplier to design and lay the foundations as well as the timber-frame? 3) What level of insulation do you want? Are you looking for passive house levels of insulation? Might you be interested in certification? 4) When do you need to build? (some more competitive options may have a longer lead time) 5) Do you want the timber-frame only, or would you prefer (at a cost) to use a firm that can supply closed panels with windows pre-fitted etc.? If you can answer some of these questions, I think that will narrow down the options... Dan
  4. @Nick1c Went to visit Zehnder this morning, and they showed me this system working and suggested considering it. Please update this thread with any further information, especially if you end up using them. Thanks!
  5. Not our experience, but maybe ours is configured to take it down to 0ppm (it was consuming 2 blocks every 3 weeks almost!) so we were getting the side-effects of artifically softened water too. Here is an explanation of what I think our problem was: https://www.thoughtco.com/difficulty-rinsing-soap-with-soft-water-607879 Anyway, at 100ppm we are much happier with washing results and we're not consuming salt like crazy either,. Also, 100ppm is low enough to not make cleaning bathrooms too much of an issue. For our new build, we'll probably want to try to find a water softener that has a configurable output hardness..if they exist, lot of other things to decide on before water softeneers though...
  6. Do you use softened water for the washing machine? We have a harvey water softener at our current rental propery and it's a nightmare for washing cloths. You have to be very careful with dosing (use a lot lot less) and even then, artificially softened water is known to be bad for rinsing so wash result not great. After trying different detergents (including the Harvey one) I ended using some test strips to mix the softened/normal water to around 100ppm, as I couldn't work out how to adjust the unit itself. Now laundry is coming out much better..
  7. No, just have PHPP estimated values. A fairly small system would cover all usage in summer, and a large system isn't going to be big enough to cover all winter usage, so it's about finding the middle ground, where we save as much as possible on import, but don't spend too much on large system that we aren't going to use fully use when export only pays 5.5Kwh. The methodology in the "self-consumption" report I shared does this analysis and comes up with optimum system and battery side, just a shame there is nothing like available publically and that I can't find the "Darke and Taylor’s excel worksheet" that this report references anyway.
  8. Planning on some active cooling yes. UFH cooling like @JSHarris @jack and others. Just not sure I need to be planning for more than blinds and UFH cooling and so I'm not currenlty plannign for any additional fan coils or anything like @joth.
  9. I read it as, with 350m3/h and an exterior temperature of 32C, temperature at room valves should be 18C. Wasn't sure what the corresponding 2,65KWh was. But yes, seems very usable.
  10. We are planning for external blinds almost everywhere, so don't think we'll need any really serious active cooling like you are planning. Instead we plan to use PV to run HP in reverse and cool the ground floor slab in the summer, as I think others on this forum do. What I was thinking though, was that if we could also use something to run cold water through HRV and not just UFH it would help with upstairs better (and be cheaper than any kind of brine ground loop)
  11. Looks like a cheaper/generic version of the "ComfoPost". This datasheet might give an idea of how well something like this might perform: http://www.alternativeadvancedenergy.eu/AAEnergy06/it/dwn.asp?ID=243
  12. I don't know what MVHR system everyone has, but Zehnder have a document on there website about overheating (https://www.zehnder.co.uk/overheating-in-homes) that mentions a product called "ComfoPost": ---- Chilled water coil ComfoPost De-humidification of filtered supply air via MVHR, during peak conditions (water at 7°C) Complete control and setting of temperature and humidity to improve the indoor climate Good thermal and acoustic solution, no draughts or nuisance noise ------ I can't find any further informtion on this anywhere on the internet though!! Anyone heard of it, or used it? (asking as we'll likely be using a Zehnder unit)
  13. Think I'm going to insist our PHPP/M&E consultant plugs in a climate change numbers into PHPP and models overheating on this basis, comparing options for: - external blinds - brine ground loop for MVHR - active cooling (from PV) via UFH and/or MVHR. I'm thinking I'll probably make sense to use 2 of the above 3, rather than rely on one, but we'll see.
  14. It's more than a trial, it's open to anyone that i) first becomes an Octupus customer ii) has or can get a "SecureTM smart meter". Over providers will do the same under the SEG scheme. Octupus are actually also offering agile tarriffs where the price changes every 30min, this is from import only currently but I can see this moving to being used for export too. Soon you may even be able to use batteris to buy electricity when it's cheap and sell it when there is demand.
  15. That's what I thought, but out TF sales person, suggested looking into this and confirming. I have the PHPP model which has the montly PV output, so I can probably extend this and play with different system sizes and compare the amount exported/imported per month. BUT, this would be very approimate as it would be monthly and not take into account any peaks/troughs in demand at all. Battery sizing is a bit more complex though, as you need to consider hourly demand also and potentially variance in PV output based on cloud cover also if you want to smooth out over days and not just over 24hrs.