le-cerveau

Members
  • Content Count

    501
  • Joined

  • Last visited

Community Reputation

139 Excellent

About le-cerveau

  • Rank
    Regular Member

Personal Information

  • Location
    Cumbria

Recent Profile Visitors

1,583 profile views
  1. le-cerveau

    Hello from the North West

    Hi, @SiBee, I build with izodom2000,, supplied from econekt. However my builders did all the work, so I can't really comment on how easy hard it was to use, however they did say once they got used to it it wasn't a problem. They had never build an ICF house but managed with minimal problems.
  2. I have installed the Brink RH sensors into my system and told it to get on with it automatically. I have 2 x MVHR units, one for downstairs and one for upstairs. The units are both located in the plant room, 1st floor, with downstairs feeding up into one and out to the attic/outside and the 1st floor one both top fed. below is a sample of the system going onto boost (automatically) during a shower: This is the first floor unit, it does 6 minute pulses (ususlly 3) until it decides the RH is no longer rising and then the RH will drop back to the baseline over the next few hours. The ground floor unit stays on for about 1 hour then ramps back as RH drops. Don't know why the different behavior, different duct lengths and they are slightly different units (top/bottom feed) but it works. The steam oven in the kitchen will also trigger it when opened. I run the system at around 66% of BR requirements and that is more than adequate. The system boosts to either BR (100%) or 125% of BR requirements.
  3. You can get High Temperature ASHP, Daikin do one, this is a 2 stage device, the water is heated by a conventional ASHP, this is then raised by a second indoor stage to up to 80oC, the downside being you cannot set it up for cooling! The original SunAmp Stack used to be specified with this. Not sure how efficient they are at High Temp though.
  4. le-cerveau

    Positioning of Plant room.

    My plant room is upstairs, 2 x MVHR, ASHP (internal unit), boiler, 4 x SunAmp, 3-Phase switchboard... However I have solid concrete floors (pr-estressed planks + screed) and a lift!
  5. le-cerveau

    SunAmp : Snog, Marry, Avoid?

    My PCM34 cells are effectively an ASHP buffer, they are charged by my ASHP up to 45oC, the ASHP shuts down at about 42 when the SA unit stops calling for heat. They are used as the the UFH buffer and also DHW pre-heat. The PCM58 cells then provide the DHW.
  6. I don't have UniQ's but rather an interim (pre UniQ) dual port (UniQ technology) units, 2 x PCM34 and 2 x PCM58. There is no casing bulging issue but the cases are remarkably solid. I don't have internal heaters (I wasn't available) so control is rather simple, when cool (what level I don't know but suspect 50%) they call for heat. apart from an initial issue which was resolved (custom controls) I haven't had any issues with them. They are effectivly 2 x UniQ Heat6/9 (PCM34) and 2 s UniQ HW 6/9 (PCM58).
  7. I am shooting from the hip but I suspect that there are basically only two UniQ (physical) models! Agree this should now be a separate thread. They come in five (5) sizes (3, 6, 9, 12, 60) and 3 PCM fillings (34, 58, 73). The two models are with and without the electric heating elements, the Heat 60 is not available with heating elements I believe. Not all combinations are available, the PCM 34 & 73 are not available in size 3 or with heating elements. So, for an example if we take a size 9 in standard PCM 58 there is: UniQ HW 9, UniQ Heat 9, UniQ Dual 9, UniQ HW 9 + I, UniQ eHW 9, UniQ eDual 9 The first 3 don’t have a heater and the second 3 do, so two physical models. I make this assumption for the following reason, design and cost, it is cheaper and simpler to have a fewer physical designs and make changes in software. As detailed in section 1.1 of the design and instillation manual. The only difference is 45mm in height (for all sizes) the electric heater element and it’s connections. The plumbing connections are the same for all models, it is just how you connect them that differs: From section 1 of the reference manual V2.0: A = High Power feeding the top of the heat exchanger. B = Low Power feeding the top of the heat exchanger. C = Low Power feeding the bottom of the heat exchanger. D = High Power feeding the bottom of the heat exchanger. High Power is typically used for the potable water and Low Power for primary Water. The order A – D varies throughout the reference manual! I will stick with this demonination. Controller details from section 3.1 of the reference manual: (there is inconsistency between the two manuals) For all but the e__ units they are designed for an external heat source, so charging direction is top to bottom, therefore Heat source flow goes to B and return to C. Potable water (DCW) feed to D and (DHW) to house to A. This is all detailed in the reference manual and also in the design and install manual. This is what I would consider normal, you pump heat into the top of the cell/tank with the return at the bottom and you feed in cold water to the bottom of the tank an d take out the hot water from the top. For an e___ unit there is confusion, the reference manual shows paralleling the HP and LP circuits (makes sense as all potable) but feeding the cold water into the top of the heat exchanger and taking the hot water out of the bottom, whereas the design and install manual does not parallel the circuits (omission) but does feed the cold water into the bottom and take the HW from the top, so again inconsistencies. I suspect this is down to the thoughts in the previous table that normal units are heated top to bottom but that the e__ units are heated bottom to top (because of the heater element), however that heat will migrate to the top of the tank so it should still be discharged bottom to top (flow) as per normal. The so-what is if you have a standard unit (NO e or I) then it can be used as any HW/Heat/Dual functionality, if you have an e or I unit it can operate as any unit an e only unit a normal unit, just ignore the heater or an I unit, it is just plumbing and wiring. So in theory (at least anyway) Jeremy can wire up his unit as a HW+iPV unit using the correct controller and it should accept charge anytime! It is all just a controller issue. Ready to be shot down in flames!
  8. From the UniQ manual posted here by somebody else. I just read through all the options. It appears that the system is capable of of doing what is wanted jut not configured by SunAmp in the appropriate manner. SunAmp should have an eHW+iPV model that is plumbed as an e__ model but controlled as a +i__ model. Ideally it should have 3 mains feeds, one permanent supply, one PV shunt and an economy 7/10 threshold take power from the normal supply. Ideally it would have more sensors than the 3 at the moment (10) so you could select each of the thresholds on setup. SunAmp could offer the units as standard or advanced, with the advanced having more sensors and control options for a small premium. Surely that is just an power limit, if you have more power the UniQ just won't accept it/you diverter channels it elsewhere. Again a control issue.
  9. @JSHarris, I have been pondering your issue for a while and think I know the issue. It is a differing of understanding between you and SunAmp. Your system is purely electrical and designed for PV input (only), which worked well with the original SunAmp. The UniQ systems have 3 options: The UniQ e___ series designed only for electric input. The UniQ ___ series designed only for external heat source input. The UniQ ___ + i__ series which takes both. The UniQ eHW/eHeat/eDual is designed for permanent connection to power and will recharge when 90%/50 depleted. The UniQ HW/Heat/Dual is designed for an external heat source (boiler/HT ASHP/…) and will signal for recharge at 50%/90% depletion. The UniQ HW +i/HW +iPV has both and will signal for the external heat source at 50%/90% depletion, but accept PV charge whenever it is available (what you want). You have an eHW but want eHW+iPV control so that it will always accept PV charge when available but could also accept mains charge when reaching 50%/90% depeletion. The problem being that the eHW charges/discharges in the opposite direction to the other units. You could potentially wire up as an eHW+iPV with mains on the control circuit and PV on the power diverter circuit, then when the control circuit is at 50%/90% depleted the control circuit could switch a mains relay changing from PV diversion to mains power (not enough PV to charge) and charge from the mains. Hopefully it would never reach this level of depletion. You would probably need the UniQ_SBC_02 controllers (suspect you can’t reprogram yours different connectors) and have to plumb the units up the other way round (flow/return). This problem is I suspect a lack of understanding from SunAMp on how units are being deployed, PV reinforcement the system should work perfectly, but for PV only the programming is wrong.
  10. le-cerveau

    MVHR Duct Design

    I originally looked at a single large unit and they are available, the issue is the 250mm connections, going to the outside with that size and then splitting it into 2 and then into your plenums, you will need 2 plenums each for supply and extract for a house that size, I have a pair for downstairs and a pair for upstairs. The issue at running these units at these speeds is noise and efficiency. At full tilt they do make noise that will then be transmitted through the ducts to some extent, and if you look at the details they are far more efficient (heat exchange) at around 50-60%. PassiveHaus specifications don't allow them to run at those speeds, a PH certified unit has a lower PH capacity that it's absolute capacity. My Brink Renovent 400's run at 140 and 175 m3/h respectively, they are capable of 400 m3/h but as you go above 200m3/h they start to become audible.
  11. le-cerveau

    MVHR Duct Design

    I had a similar problem, 472m2 floor area, which gives an extract rate of 131.37 l/s or 472.92 m3/h. I have 2 x MVHR units both running well below max as this reduces noise and increases heat exchange efficiency. My system was designed (by myself) at 495 m3/h to comply with building regs but I run it at about 316 m3/h and that more than copes with the house and is probably still quite high. My system auto boosts back up to the higher rate or even high 570m3/h based on the RH sensors in the extract ducts and these work well detecting shower usage. Layout I used the Ubbink system with 180mm rigid ducting between MVHR units and the outside/plenum boxes and 90/75mm (Outside/Inside) semi rigid elswhere. The kitchen has two extract terminals each with two ducts, everywhere else I used single ducts to terminals, though wet rooms have two extract terminals and bedrooms two supply terminals. This was to keep velocities down. The whole system is silent though you can hear the MVHR units in the plant room when at the Building Regs speed, but at the normal running speed nothing.
  12. le-cerveau

    Do I lag all my pipes?

    Mine are configured as low temp and high temp, effectively a Thermal Store without the losses. Even if you just used a PCM54 unit it is equivalent to over 100L of water do I really put a DHW tank in each bathroom (5), downstairs WC, laundry and kitchen. I would then have to run primary pipes to each unit to heat them (mine are not electric). I would also size each one for each room, so two capable of filling a bath and/or shower, three more shower only. A central point allows for diversity, I can assume not all outlets in use at once, distributed need full capacity at each outlet. They are also not cheap. If you have electric ones, how do you decide which get the solar divert first?
  13. le-cerveau

    Do I lag all my pipes?

    No, I am a SunAMp man with central storage, 4 units, SunAmp is not designed as a point of use system but as a replacement for cylinders.
  14. le-cerveau

    Do I lag all my pipes?

    I specced all pipes to be lagged (overkill). I have long DHW runs with a circulation system so lagging to keep down losses, and there's nothing worse than warm cold water!
  15. Ours have only been in just over a year and if you check online they are still available and in the 2018/2019 catalogue.