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Everything posted by SteamyTea
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Paying tips to delivery drivers
SteamyTea replied to Omnibuswoman's topic in General Self Build & DIY Discussion
Something about adding tip to bills. Donald Duck walked into a drugstore and asked for a packet of condoms. "Certainly, sir." said the lady behind the counter, "Shall I put them on your bill?" "No way!" replied Donald Duck, "What do you think I am, a dickhead? -
What are you going to do to ensure sufficient airflow? My Mother's fridge eventually broke, she could not get a replacement the same size, so now has a smaller one on a plinth. It is dreadful. Liebherr, been our most reliable fridge at work, though will stop working when the kitchen goes above 30°C for a prolonged time. And we can still get spares for it easily, except for the door seal. That can take months.
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Paying tips to delivery drivers
SteamyTea replied to Omnibuswoman's topic in General Self Build & DIY Discussion
Are they Ukrainians? -
Solar PV & battery installation on the cheap!
SteamyTea replied to Solarexploits's topic in Photovoltaics (PV)
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Welcome. First things first, do you know how much energy you currently use, in kWh. If you can split it up into space heating, water heating, cooking and general electrical usage, even better. Do you also know the construction types of the house? And your local weather regime.
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Paying tips to delivery drivers
SteamyTea replied to Omnibuswoman's topic in General Self Build & DIY Discussion
i used to work in a drug rehab unit Sounds like a good craic. -
Paying tips to delivery drivers
SteamyTea replied to Omnibuswoman's topic in General Self Build & DIY Discussion
If I know someone has had a long, special journey (and I do live miles from civilisation), I offer them tea and use of my lavatory. But never cash. Don't carry anymore these days anyway. -
VAT abolished on solar panels insulation and heat pumps
SteamyTea replied to Radian's topic in Building Materials
Is that instead of any other incentives. I hope so. -
How does your garden grow?
SteamyTea replied to recoveringbuilder's topic in Landscaping, Decking & Patios
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Living in a passive house?
SteamyTea replied to Rubecula's topic in General Self Build & DIY Discussion
As many of you know, I am an extremely low user of energy (car not included). Was sub 4,000 kWh last year. My annual estimate came in from EDF, 3,600 kWh. Should be doable. The only big differences I have are no TV (got 5 radios), no freezer, and I use a washing line. -
Yes, bigger, by 28 m2. So allowing for my upstairs, about the same size.
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Science and Art of specifying ASHP
SteamyTea replied to severnside's topic in Air Source Heat Pumps (ASHP)
We all struggle. The y-axis is the probability (or time, occasions, count), the x-axis is the classes (usually called bins) that demarcate the data (temperature, speed, wind direction). Taken at their most basic, all they show is the probability of something happening, and how often. This does not mean that something will happen, and if it does, it will last the same amount of time as it did previously. If you want to do that, then the usual way is to divide the time series into blocks i.e. 4 hours, pick the mean temperatures of the two previous blocks and see what those mean temperatures where. Then see if there is a correlation i.e. if it is 10°C now, what were the temperatures 4 and 8 hours ago. You can, if you want to get really predictive, look at historical data and see what the temperature are during the following two blocks. -
Looks bigger than my house.
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Science and Art of specifying ASHP
SteamyTea replied to severnside's topic in Air Source Heat Pumps (ASHP)
Generally no. There has to be a distinction between oversizing for the worst case, and over sizing the the most likely case. This is why knowing your local weather profile is important. An example, based on the Central England Temperatures for January and July shows several things. January is, on average, colder than July (3.5°C, 16°C. January has a larger spread of temperatures than July (19.5°C, 16.5°C). Both months are pretty evenly distributed around the mean (0.91, 0.89), but the kurtosis is visually quite different, with January being flatter (platykurtic) than July (leptokurtic), though the number, which really measure the tails, not the peaks, are not so different (0.3, 0.2), showing that the distribution is normal. So to get 99% heating via an ASHP, you need to find a model that does not drop below a CoP of 1 down to -6°C for your given flow temperature i.e. 35°C. DHW heating will have a different (higher) flow temperature i.e. 55°C. That is where you may struggle. -
Solar PV & battery installation on the cheap!
SteamyTea replied to Solarexploits's topic in Photovoltaics (PV)
Bit hard to tell what is going on. Can you discharge the batteries tonight and see what happens when they start charging up. I think it may just be fooling itself into thinking the batteries are full because if the voltage and the MPPT is just checking to see if there is any room for a bit of charge. To attach files -
Science and Art of specifying ASHP
SteamyTea replied to severnside's topic in Air Source Heat Pumps (ASHP)
So about 26 MWh. Do you know that mean outside air temperature you turn your heating on at? Mine comes on when it is less than 10⁰C for a week. DHW on E7 is going to be quite costly now, but you can add extra insulation to the cylinder, heat to a lower temperature, and use less, though a bath with a showers worth is never very appealing. -
Change plumber.
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Science and Art of specifying ASHP
SteamyTea replied to severnside's topic in Air Source Heat Pumps (ASHP)
Weather Underground had plenty of contributors in most area, find one local and then look at the daily data, collected every few minutes. I have often wondered if Bristol gets warmer in the winter when the tide comes in. Regarding the size if an ASHP, generally the fan size is similar with just more fans added to a larger radiator area. So doubt it makes that much difference. 16 kW is a large unit, can your current electrical supply satisfy it? Remember that a combi gas boiler is usually sized to the DHW supply, not the space heating.
