le-cerveau

Members
  • Content Count

    511
  • Joined

  • Last visited

Community Reputation

140 Excellent

About le-cerveau

  • Rank
    Regular Member

Personal Information

  • Location
    Cumbria

Recent Profile Visitors

1,704 profile views
  1. le-cerveau

    Which ASHP are set up to cool

    By utilizing a Duct cooler example: https://www.bpcventilation.com/cold-water-duct-cooler-range . It will only have a limited effect though due to the relatively low air volume movement.
  2. le-cerveau

    Which ASHP are set up to cool

    My set up is very non standard. My ASHP is effectively dumb and the control system does all the heavy lifting. My ASHP heats my buffer (Sunamp PCM34 blocks, pre UniQ) these are used for DHW pre-heat and domestic heating. The UFH continuously circulates through a Low Loss header (LLH), if heating is required an EBSE motorized valve switches the flow flow the LLH to the buffer, drawing heat through a Thermostatic mixing valve set at 26oC (buffer at 34-40oC). When heat no longer required valve switches back. The Sunamp is connected to the ASHP and defaults it to cooling mode, a second relay connects to the Heat/Cool/Live of the ASHP , normally it connects the live to the cooling thermostat and if a call for cool comes in then the thermostat completes the circuit, switches on the ASHP in cooling which alters the ASHP supply valve from Buffer to LLH.. If however the SunAmp needs heat, this relay is switched, isolating the cooling thermostat (ending call for cool is active) and calling for Heat, also the first relay switches the ASHP over from cooling to heating mode. This prioritizes DHW pre-heat. My ASHP is set to 45oC for heating the buffer and 12oC for cooling. 45oC works well as I have a ΔT of 5C set so it takes it's time re-heating sitting at 34oC whilst the PCM melts, usually finishing off at about 43oC, currently it draws about 1.2kW (9kW split ASHP) for the majority for the time at it's most efficient CoP of >6, dropping to above 4 in winter.
  3. le-cerveau

    ASHP + UFH quote

    Dial thermostats? come on! As everybody else says you can source all the components for far less. The DHW tank is Class C so heat loss will be a factor, need to be planned for, especially as we are having hotter summers when it is a concern.
  4. le-cerveau

    Isle of Wight Grand Designs

    Would the SAP not affect his RHI payments, with such an appalling rating he could get a massive RHI payment for his GSHP! Or am I just being cynical!
  5. le-cerveau

    Hi - ICF Project in Holywood

    Which way is north? There is a lot of glazing and if it is to the South (I suspect if it is architect design) then you are going to have a major overheating issue!
  6. le-cerveau

    ASHP and UFH

    There are various types of duct heater. A pre-heater (outside air-MVHR) is there to raise the temperature of extremely cold outside air before entering the MVHR (frost prevention) and reducing the temperature drop (a heat exchanger can only do so much). A post-heater (MVHR-house) is there to raise the exchanged air to a desired temp (heat the house). A cooler can have the same effect, reduce extremely hot (over desired) air temp before entering the heat exchanger or attempting to cool the house. In a pre-heat/cooler you are attempting to reduce the workload of the heating/cooling system in cold/hot weather buy reducing the impact of the MVHR process beyond what it can reasonably do. In a post-heat/cool you are using the MVHR as your heating/cooling system. You can do both!
  7. le-cerveau

    ASHP and UFH

    For the sake of putting it in and the minimal cost compared to trying to retrofit something, I would include UFH in both floors, even if you don''t use it initially. You can at a later date set up the slab cooling for both floors. I have piped in both floors >400m2, the house is passive standard (un-certified) and you cant tell if the heating is on or not as it is so gentle (UFH flow temp of 26oC) however last summer when it was extremely hot (house just finished) the slab cooling did come on for a few days, usually in late afternoon and of you touched the floor near the manifolds you could just about tell it was cooling, but it had the desired effect in keeping the house livable.
  8. le-cerveau

    ASHP and UFH

    Are you screeding over the over the Hollow Core?
  9. le-cerveau

    ASHP and UFH

    I would for convenience as long as the cost isn't prohibitive. But what floor type are you having upstairs as this will dictate how it is laid.
  10. le-cerveau

    Flow of house and Size of rooms

    One thought, the only bath is in the master en-suite so if anybody else wants a bath they have to use yours! I would consider a family bathroom and remove the en-suites from Bed 1 & 2, you could then line it up with the en-suite below for plumbing/drainage alignment. Utility/plant room tacked on the end you will get long service runs, DHW re-circulation required, MVHR runs...... SO possibly can it be re-thought with the kitchen by the utility, practical purposes only.
  11. 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.
  12. 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.
  13. 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.
  14. 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!
  15. 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.