SteamyTea

Why, are you diabetic? The '8 glasses of water a day' is a total myth.

For what reasons?

Read it untill you don't understand it. Then start reading from the start again. How I do it. Can sometimes take me hours to read a technical essay or report. Worth listening to those links I posted up about water. I am not going to tell people what the really interesting part was. That really requires a bit of effort to make it more valid, and useful. https://forum.buildhub.org.uk/topic/23721-water/

I did Should be 4.18 kJ/kg.K or 4.18 J/g.K

Can you use cellulose insulation?

IWI and EWI. And spend days sorting out all the places that air leaks will happen.

This is the inside of my Mother's new kettle. Less than a year old. She uses a water filter. This is the basin tap, probably 15 years old. No one has ever mentioned it being changed. And this is her water softener.

So was my school, a couple of miles away. In 1976 I think it was, Concorde was doing some low altitude 'sound' test. That was nosier than the 6AM daily flight of the VC10. Still down here it it tends to be helicopters out of Culdrose, they also do training flights in jets as well. Whenever I hear a helicopter, The Rolling Stones' Paint It Black comes into my mine and I think they must be going off to devastate Goldsithney or Perranuthnoe. Penzance now has a heliport again, but they are just dropping emmets on the Isles of Scilly

You also have to think about wall junctions and any supporting beans that can cause cold bridging to the outside. Then there is orientation. If you have an L or a T shape, with the 'leg' pointing south, you will get a lot of shading. And if you have it pointing North, you have a greater area exposed to no sunlight, so cannot take much advantage of solar gain. May make a roof unsuitable for PV as well. Then there are all the internal things to worry about, pipe, MVHR ducting and cable runs, extra doors or corridors. Waste pipes, which are large, could be a problem. Oh and any UFH pipework needs to be in exactly the place you want it, before you built the walls. There is a reason that houses are basically rectangular. It works at most levels.

Yes. You need to make it as comfortable as possible. You will be in it for years. Boxing in the underneath of a van is simple. All you are trying to do is stop air movement. So can be as simple as thick plastic sheeting or really posh insulated panels. The trouble with just a heater is that it may well raise the temperature, but you are only heating the air that is already in there. This lowers the relative humidity. Trouble is, with a caravans poor thermal insulation, as soon as the temperature drops a bit, condensation forms. It is this that causes a problem. So using a cheap A2AHP, with an adjustable vent behind it, will allow fresh air (lower absolute humidity usually) in, and heating at a much lower cost. Hot water I would just use a cylinder set to a high temp. All I had in the static I lived in 40 years ago when I was a poor student (25 quid a week including electricity at Rockley Sands Caravan Park). Mine had a tiny bath in it as well, no shower though. Was great, until the Falklands War started, then the Marine Base got really busy and noisy. I can tell you that if a helicopter, or a Harrier, flies low over a 28 foot static van, the roof bows in, and shakes the van more than any washing machine, or amorous students.

Welcome Once you have power on site, consider a cheap A2AHP to keep it warm. Something like this. https://www.appliancesdirect.co.uk/p/tf-12000ch/telefunken-tf12000ch-air-conditioner-air-conditioner Then you can tell m how easy it is fit.

Thanks I hope it makes sense, and I got all my letters and numbers right, and the invisible when typing strikethough has gone.

Me to, wish I wasn't. I brought my box of electronic with me, which I think includes an IR Thermometer for a Raspberry Pi. If I get the enthusiasm over the next few days, I way get around to making that simpler and more accurate energy monitor and link it in with some other environmental monitoring.

Welcome. There is an easy answer 1 and 3/4 hours. The better answer is to understand what it all means. I shall start with the ASHP power, the 5 kW (that is lower case k for 1000, and upper case W for watt, watt is lower case, unless at the start of the sentence or referring to James Watt). Now a watt [W] is a joule per second. A joule, J, is the SI unit for energy and is named after James Prescott Joule. Any SI unit that is in capitals like W or J, is a derived unit. A joule is derived from the kilogram (kg), the metre (m) and time (s). The kilogram is the odd one out in the SI system as it is the base unit, even though it is made from 1000 grams. So 1 J = 1 kg.m2.s-2 So all that is really saying is that you are moving energy with respect to time. 5 kW = 5000 J.s-1. This may seem a bit pointless, until you get to the bit about specific heat capacity of materials. Which is coming now. All materials have the capacity to store energy, so if you heat up a stone in the sun, it has absorbed some solar energy and increased in temperature. Always remember that temperature not energy. You can look up what the different amounts of energy that are needed to raise a material by 1 K or 1°C (note that it is an upper case K as it is named after a person William Thomson, better known as Lord Kelvin). It is generally better to use the kelvin scale, even though the scales match, once the offset is taken into account, 0°C is 273 K, well close enough). Now liquid water is a strange material in that it has a high density compared to its solid and gaseous states, 1000 kg.m-3 (at 277 K, 4°C). This works out nicely, and close enough for all intents and purposes at 1 kg per litre. The energy needed to increase water 1 kg, by 1 K is 4.18 kJ. This is usually written as 4.18 kJ.kg-1.K-1 or 4.18 J/kg.K. Now you have 200 litres of water at mains temperature (we shall call that 283 K or 10°C) and you want to raise it up 38 K, to 321 K So now it is just a matter of doing the arithmetic. Energy (kJ) needed = 4.18 [kJ.kg-1.K-1] x 200 [kg] x (321 [K] - 283 [K) Energy (kJ) needed = 4.18 [kJ.kg-1.K-1] x 200 [kg] x38 [K] Energy (kJ) needed = 31,768 All those letters, except the kJ cancel out to leave just the energy figure. So that is the energy required, assuming perfect energy transfer and no losses. Now remember that the power of your ASHP is 5 kW, which is 5 kJ.s-1. If you divide the energy needed, 31,768 kJ by the energy input, 5 kJ.s-1, you get left with the number of seconds. So Times (s) = 31,768 [kJ] / 5 [kJ.s-1] Time (s) = 6,353.6 Now we know that there are 60 seconds in a minute, and 60 minute in an hour. Time (minute) = 6,353.6 / 60 Time (minute) = 105.89 Now as that is below 120 minutes, or two hours, if we take away 60 minutes, the remainder is the minute part of the second hour. 105.89 - 60 = 45.89 Call it 46 minutes. Now add on the 1 hour. 1 hour 46 minutes. You will find that people often talk about their water cylinder storing some number of kWh (be careful with this one, it is as typed, not Kw/h, KW per Hour, or kill wot our). All a kWh is, is a constant amount of power, the kW part, multiplied by the time it is delivered, or consumed. That is why it is kWh, 1000 [k] x power [kW] x time [hour]. Now there are 3,600 seconds in an hour (60 minutes x 60 seconds). If we divide the kilo joules needed by 3,600 seconds, we get the kWh needed. kWh = 31,768 [kJ] / 3,600 kWh = 8.82 If you divide 8.82 [kWh] by 5 [kW] you get 1.76 hours. Which is 105.89 minutes. In reality, there are losses, and the closer the sink temperature (the water in the cylinder) and the source temperature (the water from the ASHP) get to each other, the less energy is transferred, so it will actually take longer, but that is another lecture in thermodynamics. (as usual, I may have made an error somewhere, and I am sure others will pull me up on it)

How much are they going to charge you for off peak power. Be interesting as the prices have risen.

@JohnMo Is that multifoil insulating the area? Have you ever checked the thermal losses from your combination cylinder?

@Russdl If you have an IR thermometer, may be worth taking some measurements during the day and night. You may find the rise in temperature is just the air temp.

Would an exhaust air heat pump be easier. I think @Gone West had one in his old place.

And less reflection off the panes, and less absorption by the panes.

My two points. The sun is at a lower altitude in the sky, you you may be getting in more radiation that you think. More than 'summer', which is generally cloudy and wet where I am. How much daylight do people actually need in a house. Like artificial lighting, most people put in a lot more than, in my opinion, is comfortable. But I have had my cataracts replaced with shiny bright acrylic lenses.

Or they have bought carbon offsets from companies like Tesla. Customer choice has little effect on RE generation capacity. Legislation is what is driving this. 3 phase is basically 3 separate electric supplies (they are connected, but offset by 120⁰, at the generator). So expensive to install and pay the ongoing meter rental. You can get an instantaneous, inline heater that can take a hot water supply. So a small cylinder, heated at night on E7 (or other time of day) may be possible. But look at reduction first. Not many people really need a half hour shower at 20 litres/minute flow rate. 3 minutes at 8 l/min would get the normal dirt off.

Add in a carbon cost into the spreadsheet. A penny a kWh would be a high starting point, at 0.15 p per 1 kWh would be about today's cost.

Possibly. I just picked one source. it is too easy to pick multiple sources to get conflicting figures. I can't actually see an annual tonneage figure in the report you linked to. But I am doing other stuff right now.

I got the numbers from the individual country page, not the main page I linked to. Assumed they would be the same units. Vietnam 56,641,097 Tons UK 41,459,830 Tons I hate all units that are not SI. The updated numbers are not hugely different.

I have some 'plans' for the next 9 years, some of them are legal. Vietnam consumes 56,641,097 tonnes of coal a year. UK 41,459,830, So about 16m tonnes a year less. https://www.worldometers.info/coal/coal-consumption-by-country/ They have about 30 million more people than us.