JohnMo
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Everything posted by JohnMo
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Simply because the flow temperature are low. You can't have a flow temp of say 30 deg, a room temperature of 20 and return temp of 10. The return temp cannot be lower than the room temperature, to get satisfactory heat transfer to the room the return temperature will also be above the room temperature. The more work the heat pump has to do the less efficient it becomes. A low temperature gas boiler is exactly the same.
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I have just looked at 2 weather apps for my house location. One says it's currently -4 and fog, the other -2 and sun. Both have it part correct. Actually -4 and bright blue sky and sun. Yesterday similar experience, said sleet between 08:00 and 10:00, it was sunny. Then 0% of rain for the rest of the day, but it rained all afternoon and evening. -
The colours are Green, power going to the house, running MVHR, heat pump etc. this is also represented as import electricity in the light red/pink section below the dark red. The way mine works, during off peak, it charges battery and any consumers take electric direct from grid, not the battery. At the end of the off peak period the battery is at 100% charged, then house consumption comes from battery, until departed to 5%, then grid power is taken by the house.
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And people pay or even think paying that?
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GivEnergy AIO charging last night - dark red area, charging 6kW.
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But if the off peak wasn't viable without the battery, you need to compare to full price normal tariff, i.e. 27p, so the saving becomes 18p per kWh. You cannot self install (GivEnergy AIO) without be trained, you cannot commission without access to the commissioning tools. It does add to the cost.
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Those at the bottom are graphs referring to operation of circulation pump on-off cycles Just section 6.2 applied, not section 7.
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Double post
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Basics are Heat pump will have a defined minimum flow rate. That sized heat pump could be around 25L/min or more. If you are trying to operate without a buffer and you have loops closed, or part closed - then no chance. UFH basics Heat output is linked to the mean flow temperature, the higher the flow rate, the smaller the dT so higher the output. You are stating the opposite? 6 loops will only output only part of the load your heat pump is putting out. Something sounds odd. Can you explain your full system? It is more likely your heat pump is cycling, so not transfering the heat needed. Too big for the duty it's being asked to do.
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Mine is not warm to touch, but not cold either. Our rooms are around 20 to 21, the floor is only a couple of degrees warmer. Poor insulation (U values) required to get a warm floor.
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Does your heat pump accept a 0-10v input. An aircon type thermostat can output a 0-10v output, this up to reduce flow temp as required. May not work with UFH due to reaction time, but ok for radiators. This is a screenshot from my manual for a different heat pump
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Would doubt Brexit had much to do with this subject. You can get ASHP easily enough, you can A2A easily enough also. Suspect as mentioned, grant scheme is the main issue, second Aircon isn't covered under permitted development, so would require planning permission, third, the population away from build hub, wanting Aircon is very limited. Forth the population wanting Aircon and water heating in a single unit is even less of a market. If set on A2A do that, and something like a Dimplex Edel for hot water. Or time of use and direct immersion, some PV would allow most your summer hot water to be free. What are you doing for bathroom heating?
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There is an ArgoClima agent in London and another in Eire. Their monobloc unit can water fan coils and heat the cylinder via refrigerant. Would say because the BUS grants don't allow you use those type of units, so likely to be small scale sales, so why bother importing? Never heard that before. My UFH has the total of 14 joints all above floor level. So possibly less than a fan coil or radiator system.
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What extra can he get back that you are not already allowed to claim? Took a couple of day cataloguing my receipts (so cost nothing to claim), but couldn't see any missed opportunities to get vat back. Had nothing rejected either.
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Why make stuff complex A2W and a few fan coils - done, you don't need to flow much above 32 to 35 so a SCoP of 4.5ish. Or UFH flow 30 or below and better SCoP. You can cool with UFH or fan coils - fan coils are better at cooling, UFH feels better at heating. Keep it simple.
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Fence Install - do I have a problem?
JohnMo replied to Ferdinand's topic in General Self Build & DIY Discussion
I would just point out that the fencing man, has effectively replaced your fence, at their expense, as it is on your land. Wiggle in a DPC to stop a water bridge, or tell them to get fence man back to fix issue, as it will lead to a damp problem for you and them in the near future. Say thanks for the new fence -
Grant will now work with Homely, they also list smart control also, but sure if it's the same thing. What do you mean by advanced WC? UFH or radiators?
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Now what do you define as smarter? New build or modify existing?
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You need an air gap either side, assuming you are talking accoustic insulation. Everything needs to be cut anyways. We used Flexi it's good, for the wider studs we used 100mm and 4x2 used 70mm.
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The reason for that sheet isn't as you describe. That sheet is to stop a chemical reaction between the aluminium and screed. The chemical react forms hydrogen bubbles in the screed. The sheeting also acts as a barrier to stop the screed getting under the insulation and floating it on top of the screed.
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What happens when power comes back?
JohnMo replied to puntloos's topic in Kitchen & Household Appliances
I will find out on Tuesday, we have a planned power outage for 3 hrs. Hoping I notice nothing and everything continues as normal. No EPS as such, it should hopefully continue as normal, up to 6kW output, plus whatever solar is putting out. -
Wall mounted basic ASHP for workshop
JohnMo replied to Mudmouse's topic in Air Source Heat Pumps (ASHP)
Think it assumes you have your own solar generator. Then it doesn't matter how much solar the grid is producing. I actually forced started my ASHP today as the yellow ball in the sky was producing plenty -
Not sure - maybe not tight enough, maybe too tight. Or was there just such a small leak I didn't see it. Had quite a few issues with compression fittings, are they just being made from rubbish materials - down to a price instead of up to a quality? Where I have used Hep2O or Tectite push fits, seal first time every time.
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I would really make access available. Had all my pipes, in tested and leak free, for 2 years all ok - and then had 2 compression joints start to drip - luckily I had access.
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Have a look at Harlequin cylinders. They have a mains pressure coil, so supply water at main pressure. Do not need an overhead tank or any overflows. Or UVC, you need access to drain point for its safety devices. Or local hot water on demand cylinder in sink and at basin. Or something like https://www.cylinders2go.co.uk/shop/uncategorised/comet-by-telford-10-litre-stainless-steel-1-5kw-undersink-heater/
