Dan F

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  1. Dan F


    To be fair, I don't think heating systems are most architect's area of expertise! If you can, get some advice from an M&E consultant or from talking to various installers that have experience with renewable systems. - Already more electrcity comes from renewables than fossil fuels (2020 data) and this will likely improve futher over time (see quote below) - If you have fair amount of PV (or solar thermal) you can get free hot water in the summer with no need for a boiler or burning fossil fuels. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/972779/Energy_Trends_March_2021.pdf
  2. Yeah, either that or I lied when I signed up 🙂 Can't remember now...
  3. Maybe you went to monitoring site instead of designer? Designer does ask you to sign-up but you shouldn't need to be installer or have a seriel number, bit silly if you need a system to design a system 🙂 http://designer.solaredge.com/
  4. Agree with @jack. Solaredge actually recommend "oversizing" and their design tool will size inverter based on expected generation and not nominal wattage of the install. Their single phase inverters support up to 150% oversizing. Few advantages: - No need to request more kW from DNO then needeed. - Inverter is more efficient if sized to actual expected production as @A_L also explained. - Potentially bit cheaper capital cost. @Thorfun I sugest you model system on Solaredge design tool to determine inverter to use. Doesn't take too long.
  5. What is a " 3-point signal"? Do you are also have a temperature sensor on output of this and are using something like https://www.loxone.com/enen/kb/mixing-valve-controller/ ? Was just talking about this with out installer this morning, he was suggesting a mixing value with 0-10v input for UFH/Comfopost, not sure which one though...
  6. Few more leads: - https://www.baswaacoustic.co.uk/baswaphonclassicfine - https://www.acosorb.com/acoustic-plaster - https://www.oscar-acoustics.co.uk/acoustic-solutions/oscar-elite.asp Almost certainly all a lot more expensive that standard board and skim, but I'll try to call a few and get some ballpark prices..
  7. Agree, most of the benefits are from the partial charging, which is why we are going to try to use the indirect coil even though we are using a ASHP. I gave up trying to work out how I could possibly use Sunamp with a ASHP when I discovered each ASHP model had to be i) tested ii) have it's own ASHP specific controller!! On the PHE, this is what they say: - Delivers 10-20% more usable hot water than a similar sized conventional cylinder - More efficient heat transfer with high surface area PHE minimising heat pump delivery and return temperatures - More even temperature in tank (due to pump I guess) - PHE is easier to service/replace than a coil. Of course, the down side is that there is a pump involved I guess.
  8. I'm sure you'll pick all of these points apart, but in theory at least (and dependent on heat source and requirements): - If using ASHP, the use of the PHE gets you more effective capacity than a large heat-pump coil would. - If using top indirect coil and/or immersion, the ability to "partially charge" if you don't need full tank heated (e.g. low occcupancy) which in turn reduces both energy usage and heat loss. - Improved inlet difusor and circulation pump both of which improve stratification over a more standard UVC - Reaheat time much less of an issue because coil/immersion are at top of tank and due to effective stratification. The app can be seen as a toy yes, but if you don't have any home automation set up and it allow you to i) avoid fully heat the tank when not needed ii) heat tank at specific times based on dynamic tariffs, then IMO this does add significant value, at least for the average user, maybe less so for an advanced users who doesn't need a proprietary app to automate this. (I won't be using app, and will instead use Modbus interface). I'll be able to report back, hopefully with data, once everything is set up. The 300L is around £1200 and the PHE is an additional £160, not sure what the additional £300 for controls comes from? EDIT: Prices are from sometime last year, direct from Mixergy and exclude VAT. I see midsummer wholesale prices are quite a bit higher!
  9. Did they actually check and measure it on-site? Did they know you were using MVHR and see the flow calcs...
  10. We are 300m2 PH and have approx 3kW heating load. Going with: - Vailant Arotherm Plus 7kW (+ the Vaillant on-wall buffer tank) - 300L Mixergy Tank. - MBC installed in-slab UFH operated as 1-zone with Salus auto-balancing actuators for heating + cooling. - Comfopost on first-floor MVHR supply for supplementary first-floor heating/cooling. - WWHRS for showers (to save energy, but also to effectively increase the capacity of UVC and make the reheat time less critical) We are going to try to run the Mixergy using the indirect coil which allows for partial "charging", but may revert to using their ASHP approach which is to use an external PHE if needed. We are only just starting to install elements of this setup though, so won't be able to report back on it for a few of months.. ASHP/UVC is about sizing it for you requirements plus any preference in terms of brand and also supply availability, not sure that is a huge amount more to it. Use of Sunamp, Mixergy, ComfoPost, WWHRS etc. are all alternatives or optional extras that you need to consider if make sense or not for your setup and what you want to do.
  11. Dan F


    I guess it depends if you want to prioritize sound insulation or sound absorption. I'm no expect, but I would probably think about doing the following if build-up depth was limited: Sound insulation with some absoprtion: 2 SB + surface mounted Akupanels (50mm total) Sound absorption with some insulation: 1 SB + 25mm battens (mineral woold in. between them) + surface mounted Akupanels (60mm total) We have one ceiling panel where we'll use 2SB + 38mm battens + Akupanel, but we also have a wall that is already boarded, so might just surface mount, even though this isn't ideal from a sound absorption perspective.
  12. Dan F


    Our main contractor ordered some aCupanel samples. I've just ordered some Akupanel and Slatwall samples. Will report back. (One of them, can't remember which, sells inividual depper slats that allows you hide the backing from the side if you surface mount)
  13. Dan F


    So are Acupanel and Akupanel two different products? It looks like Danish Akupanel (with a K) is the good one? There is also one called SlatWall. @Thorfun The effiveness looks pretty good from looking at datasheets, especially if you use mineral wool behind them rather than service mounting on PB.
  14. Master bedroom will have drop seal, so will TV room. In master bedroom the MVHR extract in en-suite is the same as MVHR supply in bedroom so not needed here. In the TV room we will be fitting a "acoustic air transfer unit", still need to source one though...
  15. Dan F


    Which install method are you using: - Surface-mount on plasterboard (class C absorption) - On 45mm battons with mineral wool between them (class A absorption) - Somewhere inbetween? We've already boared one of the walls where these are supposed to go, so unless we undo things looks like we're going to need to surface-mount which I'm only now realising isn't ideal.