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Posts
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Everything posted by SteamyTea
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Will it stand the rock of the 'new waitress' test.
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How to predict heat pump size from your EPC
SteamyTea replied to sharpener's topic in Air Source Heat Pumps (ASHP)
All identical except 4 are end terraced. My usage, like my immediate neighbour, is lower as we are single occupancy and out a fair bit at work, and both as tight as Cornish can be. And we are both the only mid terraced. If 6MWh annual usage is close to real, then that implied a 2.4 kW heat pump, which realistically becomes a 4 kW heat pump as I think that is just about the smallest available (might be 3.8kW). I think the main point is that using an EPC is probably not a reliable way of sizing (the multiply by 0.4 has been touted around for a long time). OK as a first order check, but probably that is all. Much better to spend an hour a week reading the meters. -
How to predict heat pump size from your EPC
SteamyTea replied to sharpener's topic in Air Source Heat Pumps (ASHP)
I thought I corrected for that later on. That is to estimate the usage from the missing EPC data, it has the kWh.m-2.year-1 data on them all, but only the total annual usage on 3 of them. Yes, blame it on gungy eyes this morning after a days gardening yesterday. -
That was my experience, but this is derailing the topic, except there are lots of opinions about most things.
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How to predict heat pump size from your EPC
SteamyTea replied to sharpener's topic in Air Source Heat Pumps (ASHP)
Well as I am one of six places, which all have an EPC, lets us see what comes out No 1 0.4 x 6,788 = 2,715 kWh.year-1 No 5 0.4 x 6,222 = 2,488 kWh.year-1 No 6 0.4 x 6,371 = 2,548 kWh.year-1 Now as some of the EPCs are the old ones, I can try and estimate from primary energy usage for the missing data. No 1 Primary Energy 368 kWh.m2.Year-1 No 2 Primary Energy 289kWh.m2.Year-1 No 3 Primary Energy 320 kWh.m2.Year-1 No 4 Primary Energy 183 kWh.m2.Year-1 No 5 Primary Energy 364 kWh.m2.Year-1 No 6 Primary Energy 378 kWh.m2.Year-1 So using the average conversation factor of 17.5 x Primary Energy I can estimate the missing data. No 2 0.4 x 5,047 = 2,018 kWh.year-1 No 3 0.4 x 5,589 = 2,236 kWh.year-1 No 4 0.4 x 3,196 = 1,278 kWh.year-1 Taking the median (middle value to account for odd results) of those 6 and converting to MWh gets us to 5.9 Now I have no idea how my neighbours live, but I do know my space and DHW usage. The mean winter period for this year, so far is 11.5 kWh.day-1. So if the heating was on permanently that would be 1.68 MWh.year-1 which implies a heat pump size of 1 kW. But it isn't. For 8 months of the year my usage is 5 kWh.day-1, so space heating and hot water is 2.4 MWh.year-1, that implies a heat pump size of 1 kW. So I would not use EPCs as a guide to heat pump sizing as it could easily be 70% out, and in a small house impossible to buy. Rather than guess at usage from proxy data, just spend a few quid and measure it. If a HP installation is going to cost £3000, spending £100 on an energy and temperature logger really will take the mystery out of it, and if you have Smart meters installed, all you need is a dual temperature logger. I think I have made an error somewhere, shall try and find it before I go out. Actually I think I am right, I did not take into account that 4 of the houses are end terrace/semi detached and mine is a mid terrace, so less exposed wall area by quite a margin. My usage is similar to the other mid terrace, so an adjust upwards should be applied. -
Make a change from Stargazy Pie and Saffron Buns. I have done Jury Service on a sexual offence charge (and a theft/assault charge as well). The opinions of the gobby juriers is unbelievable and the evidence presented to them is of no consequence, even when they are direct to deliver a not guilty verdict. It was one of the worse 2 weeks of my life and an innocent person was found guilty. I was so upset that as I walked back to my car I was in tears from anger, frustration and injustice. I felt I should have done more along with the other two people that were working to the evidence, one of which changed their mind without an explanation (they got paid the same to sit in the courts as they did cutting up bacon at work).
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Cheap or expensive induction hob saucepans
SteamyTea replied to SteamyTea's topic in Boffin's Corner
A new wife might. This one don't even need a kitchen. -
Cheap or expensive induction hob saucepans
SteamyTea replied to SteamyTea's topic in Boffin's Corner
It takes a higher temperature, or a larger 'ring' to get the same energy though the pan and into the water/fat. -
Cheap or expensive induction hob saucepans
SteamyTea replied to SteamyTea's topic in Boffin's Corner
Cheap ones perform just the same as expensive ones. -
Cheap or expensive induction hob saucepans
SteamyTea replied to SteamyTea's topic in Boffin's Corner
My cheap pan is a bit warped, but does not affect it. Cast Iron 52 W.m-1.K-1 SS (316) 16.2 W.m-1.K-1 So not surprising it needs more energy. -
If you don't mind a bit of noise, how about plinth heaters.
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Does the right really reduce taxes, not worked in the UK.
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I have a bottle of methylated spirit for the same reasons.
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I am all for that. We can charge you more for things that are southern based. So TV and radio broadcasts, proper beer, fresh vegetables etc. Who needs a universal service. Let's carve the nation up and say '(expletive deleted) you' to the neighbours.
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Ground array: future project, what cables
SteamyTea replied to Post and beam's topic in Photovoltaics (PV)
Lots https://www.fabhabs.com/dc-cable-sizing-calculator -
I think there are restrictions at the local levels as well. Thing is, no matter how much is invested, it cannot be changed overnight.
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Zero to Hero as I was wanker of the week a few days ago.
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At least. And for deaf people I sign, which oddly enough, in BSL has regionality. Down South you point with index and middle fingers towards the floor, while mouthing 'dog' silently. Up North you just tap your leg, while mouthing. Korea, you sign FP for frying pan.
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Cheap or expensive induction hob saucepans
SteamyTea replied to SteamyTea's topic in Boffin's Corner
Good man. Call it Citizen Science. -
Cheap or expensive induction hob saucepans
SteamyTea replied to SteamyTea's topic in Boffin's Corner
It is a hob, not an objet d'art, they are meant to have scratches. -
I never used to think much to nails, mainly because I am a clumsy (expletive deleted)er and and kept bashing my fingers. But then I learnt about them and they are fantastic fixings for timber. It is odd that your BCO does not trust the SEs calculations, even odder that builders, old school or no, think they can override the SE design.
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Ground array: future project, what cables
SteamyTea replied to Post and beam's topic in Photovoltaics (PV)
They for for extracting the best performance out of a shading compromised array. Actually, they were for installers to make a few extra quid in most installations. -
Cheap or expensive induction hob saucepans
SteamyTea replied to SteamyTea's topic in Boffin's Corner
I think there may be a bit in that, though I would have thought at all SS induction hobs are made from very similar material. I have a cheap frying pan what is aluminium (cam from Aldi) and that has 'pins' in the base, it works very well. My kitchen was a lot colder. I gave it a few minutes for the temperatures to settle and I did not want the hob pulsing, which it would do on power2. -
I went to one of those, well two. Look what a fine person I have turned out to be.
