SteamyTea

@Barney12I have had middle age firmly thrust upon me recently. The NHS has asked me to go for a bowel screening. Will I look like that cat?

Maybe I should have looked at the spreadsheet and realised it was about MVHR. But as I was unable to read it clearly, I did not bother.

Is re-heat the power you would need to raise the temperate up (from some arbitrary temperature), rather than just hold the temperature steady?

Me neither, where are they and what do they refer to? Watts is power, kWh is energy (or heat). Are you saying that it needs somewhere between 518 and 776W of power to hold the temperature where you want it (the 21/22°C). That would be 14.43 to 18.62 kWh/day.

To a certain extend, a duct is just a box with two open ends. It does not have to be round. There is a lot of wasted space inside a stud wall, see if you can use it. It is easy to make filters, that material is available online or from a manufacturer (I used to make air filters). The big issue is noise, both through the wall and via ductwork. Filters in the ducts help reduce this. I have a stud wall I would like to move one day to make the kitchen a bit larger and only loose a book shelf in the other room (I have a Kindle for books now). I thought I could put my storage heater in that wall and vent out either side. One 35 kWh storage heater is enough to heat my place. I could also pipe a bit up the stud wall, though the floor to each bedroom.

If you double the diameter of a round pipe, you quadruple the area, so you can run air though at a quarter of the speed for the same amount of air shifted. I would be tempted to make up my own MVHR (see GBF about that a few years back). They are really pretty basic things. There is no reason why you cannot make one with a polystyrene box, some silicone paper and a couple of fans.

Any good. http://www.buildstore.co.uk/finance/buildcare.html

Are your internal walls stud walls? If they are, can you pipe the room inlet down them towards the floor? For that matter, can you take the extract out of the top of the wall. Saves having holes in the ceiling. If you go oversize on the MVHR unit (and like an ASHP, you should as you get better efficiency) you could put in quite large vents in each room. That will keep the noise down and get rid of the risk of drafts. With a house your size (not so different from the downstairs of mine), have you though of using an oversize MVHR in conjunction with two small Air to Air heat pumps. They do heating and cooling usually and cost very little. A couple of these would easily heat and cool your place. https://www.debenhamsplus.com/p/865337/1000-btu-panasonic-powered-quick-connector-wall-mounted-inverter-air-conditioner-with-4-metres-pipe-kit-5-years-warranty?refsource=Deadwords&gclid=CMDDoOr78NACFUa6GwodrG0G3w

The thing with heat losses from DHW cylinders is that they are uncontrolled. So you may well end up with too much heat, and the associated temperature rise where you don't want it, or where it contributes nothing to the overall house temperature. Te worse case is that you may have to pump some air out the house to cool it. There is also the question 'What are you wanting to achieve with your DHW system?' Do you want permanent hot water Do you want lowest running costs Do you want lowest capital expenditure Do you want the simplest system I am sure there are other things, but you get the idea.

Yes, that is the theory for infinite space, and quite possibly for semi-infinite space. But a room is very far from semi-infinite, and as you point out, the temperate differences are very modest within a room. Limits have to be introduced to create a more realistic model, and those limits will be small. I also think that there is not enough consideration taken into account of the emitting frequency, which is really the energy level of the source, not all frequencies are equal (as my cataracts demonstrated). I am not sure of an easy way to test ideas for radiative contribution to heating. I do have a radiant heater in my bathroom (never switched it on). Maybe I could use that and a metal plate on the wall to see what is happening. Shall think about that when in the bath. I think that the real problem is that any radiative affect is swamped by convection and conductance and very hard to measure in a meaningful way.

Isn't the distances between the emitter and the receiver important when it comes to radiant energy transfer? If it wasn't the surface of the Earth would be a lot closer to the temperature of the Sun's surface.

Who is paying for all these great offers on using cards? I have a standard bank account (I can change to another but never change back), seems simple. No fees (unless overdrawn), pay money in, pay money out.

I like this idea as after a bath, I find that I feel quite warm and would need less heating anyway. Also made me think of something that Joe90 was saying about putting in a bit of pipework into his slab where he expects to get some solar gain (he ain't realised that it is always cloudy in Cornwall yet). Using a multiple coil set up in a slab would also give some flexibility if things don't work according to plan i.e. you can add or remove extra heating easily.

The last track on the LP was my favourite

That is something that should be forced upon the energy companies and the price comparison sites, would need the standing charge as well. It could be done within a week if there was a will. It makes me wonder if OFGEM know anything about the industry. All a customer would need to know then is their usage in kWh, and that is on the bill.

Back to my question about the store. It seems a complicated and backward step to me. But then I like simple things. As for the SD card thing, what happens when they stop making SD cards, or they are not supported any more. I have Sony camera, it has its own card format, I think I may have an old 'XD' card somewhere. I did throw out the old floppy disks the other day, including my copies of AutoCad, Office and Photoshop. Heating systems should be designed to last at least 30 years, 50 would be better. There are no mysteries left at this level of thermodynamics, so we know what is needed and how to do it.

Not sure I understand what is happening here. As it is an unvented store, does the mains water just enter it cold, get heated, then comes out the top to the tap (I don't think this is what happens). Or does the water in the cylinder get pumped though the plate heat exchanger, heating the the cold supply that then goes off to the tap (I think this is what happens). So this system will always need a working pump and a power supply then.

Who has your cash Barney GBE or OVO? There is a bit on the Ofgem's website about protection. But as you say, I bet it becomes complicated.

So this is the first one. Here is the FT bit on it. https://www.ft.com/content/fc943f58-b499-11e6-ba85-95d1533d9a62 (You may need to do a Google search to bypass the paywall). I heard that OVO wee offering 3% interest on any overpayment, that is an easy way for them to raise cash. But is it because they cannot raise cash any other way.

Terra Terra Earthing, basically a large nail in the ground

Yesterday looked like a grim day up your way. Only 3 times brighter than night time

Should end up with something like this: Date Temp Temp Day Only Windspeed Windspeed Day Only Solar Solar Day Only 04/07/2016 16.3 17.4 2.1 1.8 161 229 05/07/2016 14.5 14.8 6.5 6.9 241 334 06/07/2016 15.3 16.0 3.2 3.8 172 230 07/07/2016 16.3 16.5 4.9 6.6 124 178 08/07/2016 16.3 16.6 13.7 18.5 197 286 09/07/2016 17.5 18.0 1.7 2.0 99 143 10/07/2016 17.4 17.9 6.0 7.8 168 245 11/07/2016 14.7 14.9 13.3 16.3 69 102 12/07/2016 13.9 14.3 1.7 1.8 158 224 13/07/2016 13.9 14.4 6.3 8.5 221 316 14/07/2016 14.3 15.1 4.5 5.4 223 318 15/07/2016 16.0 16.6 1.9 1.9 104 141 16/07/2016 16.5 16.6 9.4 9.6 188 280 17/07/2016 16.0 16.7 6.5 7.7 240 342 18/07/2016 19.7 21.6 0.8 1.1 256 369 19/07/2016 24.6 26.6 2.4 3.0 312 445 20/07/2016 21.2 20.7 5.2 6.4 234 308 21/07/2016 18.6 19.4 2.9 3.0 262 347 22/07/2016 18.7 20.0 2.4 3.0 189 283 23/07/2016 17.8 19.0 1.0 1.0 177 259 24/07/2016 18.0 18.9 2.3 2.4 106 157 25/07/2016 15.7 15.9 11.3 13.5 154 225 26/07/2016 16.7 17.3 7.5 9.3 158 238 27/07/2016 16.2 16.6 4.7 4.5 231 343 28/07/2016 15.6 16.3 3.4 4.1 125 187 29/07/2016 16.5 17.0 4.4 4.7 180 270 30/07/2016 15.0 15.6 4.5 5.7 158 235 31/07/2016 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #### #DIV/0! 01/08/2016 15.6 16.4 2.8 2.4 110 165 02/08/2016 17.1 18.0 3.7 3.4 88 133 03/08/2016 17.4 17.8 11.5 12.3 138 218 04/08/2016 16.2 16.7 17.1 14.7 162 254 05/08/2016 16.3 17.1 4.2 4.4 208 309 06/08/2016 18.8 19.8 4.4 5.1 210 315 07/08/2016 17.9 18.2 23.6 26.6 203 333 08/08/2016 15.2 15.8 17.0 14.5 220 340 09/08/2016 14.0 14.8 5.7 7.0 146 229 10/08/2016 13.5 14.0 5.6 6.6 98 160 11/08/2016 15.2 15.5 20.3 22.2 66 108 12/08/2016 17.0 17.4 19.2 20.2 172 272 13/08/2016 16.2 16.5 14.1 14.0 170 269 14/08/2016 15.8 16.6 1.4 1.3 145 230 15/08/2016 17.3 20.0 1.2 1.5 212 334 16/08/2016 18.6 20.8 3.5 3.7 221 352 17/08/2016 17.7 19.6 4.1 4.8 218 351 18/08/2016 18.7 20.8 5.1 5.7 190 305 19/08/2016 16.2 16.4 4.3 3.8 82 132 20/08/2016 16.0 16.6 10.1 9.1 110 178 21/08/2016 16.3 16.7 12.1 13.8 128 213 22/08/2016 17.6 18.2 6.9 9.8 96 158 23/08/2016 19.9 22.3 0.8 1.0 191 314 24/08/2016 17.3 18.6 1.0 1.6 194 315 25/08/2016 16.8 17.6 1.2 1.4 54 95 26/08/2016 16.6 17.8 8.9 11.8 201 331 27/08/2016 15.9 17.7 3.6 4.2 127 212 28/08/2016 16.9 17.9 1.9 2.0 151 255 29/08/2016 16.0 17.1 3.1 5.1 205 348 30/08/2016 16.9 18.8 2.4 3.4 115 197 31/08/2016 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #### #DIV/0! 01/09/2016 15.9 16.8 6.1 7.4 124 216 02/09/2016 16.2 17.1 9.2 13.9 140 243 03/09/2016 14.2 14.3 1.8 1.9 43 75 04/09/2016 15.8 16.7 8.3 8.4 142 254 05/09/2016 17.6 19.3 2.0 3.3 135 233 06/09/2016 20.4 21.8 3.0 4.8 107 189 07/09/2016 21.3 23.1 0.8 0.9 148 259 08/09/2016 17.2 17.2 8.1 13.4 124 228 09/09/2016 17.5 18.6 3.0 2.9 75 138 10/09/2016 14.1 15.0 1.6 1.4 118 215 11/09/2016 15.5 17.2 2.5 2.2 130 226 12/09/2016 18.1 19.7 3.4 4.0 80 140 13/09/2016 18.6 19.2 1.7 2.4 73 136 14/09/2016 20.2 22.4 6.0 9.6 151 274 15/09/2016 18.3 19.8 0.8 0.8 123 230 16/09/2016 15.4 15.7 6.0 8.1 127 238 17/09/2016 13.7 15.4 1.0 1.7 147 276 18/09/2016 8.5 8.8 0.2 0.6 16 55 19/09/2016 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #### #DIV/0! 20/09/2016 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #### #DIV/0! 21/09/2016 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #### #DIV/0! 22/09/2016 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #### #DIV/0! 23/09/2016 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #### #DIV/0! 24/09/2016 18.2 18.7 4.0 3.1 18 48 25/09/2016 14.0 14.7 8.6 16.1 113 226 26/09/2016 12.2 13.0 1.0 1.5 56 114 27/09/2016 14.9 16.0 5.9 10.1 96 189 28/09/2016 17.3 18.1 10.2 6.8 91 185 29/09/2016 14.8 15.0 29.6 36.1 85 172 30/09/2016 12.2 13.5 9.3 12.7 105 212 01/10/2016 10.8 12.4 2.4 3.8 54 110 02/10/2016 9.7 12.2 0.6 0.8 118 245 03/10/2016 11.2 13.9 2.4 2.7 110 229 04/10/2016 13.6 15.8 6.1 6.8 105 211 05/10/2016 13.7 15.2 11.2 12.9 114 235 06/10/2016 11.2 13.2 9.2 14.2 103 215 07/10/2016 12.3 13.4 4.1 4.3 56 121 08/10/2016 12.5 13.4 2.3 3.6 84 185 09/10/2016 10.6 12.0 2.8 3.0 71 151 10/10/2016 9.0 11.0 2.3 3.9 87 184 11/10/2016 9.5 11.0 6.3 8.2 62 135 12/10/2016 11.2 12.3 9.0 8.5 51 111 13/10/2016 9.8 10.8 7.7 10.3 52 116 14/10/2016 10.2 11.9 5.9 7.6 54 123 15/10/2016 10.4 12.2 2.1 1.9 72 162 16/10/2016 11.4 13.2 3.6 4.3 64 147 17/10/2016 11.8 12.8 6.1 10.0 62 144 18/10/2016 10.4 10.1 13.4 18.5 31 71 19/10/2016 11.1 11.9 2.4 2.4 70 156 20/10/2016 9.8 11.2 0.2 0.2 47 108 21/10/2016 8.3 9.7 0.3 0.4 64 131 22/10/2016 7.6 9.9 3.1 5.3 46 106 23/10/2016 8.2 10.0 8.4 13.7 37 91 24/10/2016 8.2 9.8 4.3 5.8 46 108 25/10/2016 9.3 10.3 1.3 2.0 37 88 26/10/2016 12.4 13.4 8.0 13.4 42 101 27/10/2016 13.0 13.8 11.9 20.9 27 66 28/10/2016 12.9 12.7 8.7 0.2 27 70 29/10/2016 13.0 13.4 1.2 1.0 22 56 30/10/2016 11.8 12.6 0.5 0.1 28 73 31/10/2016 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #### #DIV/0! 01/11/2016 8.0 10.2 1.6 3.8 36 92 02/11/2016 5.7 7.8 0.4 0.7 39 97 03/11/2016 6.9 7.4 1.5 0.5 14 37 04/11/2016 8.0 8.8 5.9 8.4 30 79 05/11/2016 5.6 6.5 2.2 3.6 28 71 06/11/2016 4.9 6.3 3.0 5.6 31 75 07/11/2016 3.6 5.1 1.2 2.2 32 75 08/11/2016 1.3 2.1 3.5 1.6 16 44 09/11/2016 3.7 4.5 3.1 0.7 21 66 10/11/2016 7.0 8.4 8.0 12.3 28 74 11/11/2016 4.3 5.3 2.6 2.0 25 66 12/11/2016 9.1 10.7 3.7 2.9 26 71 13/11/2016 8.5 8.7 0.8 1.3 24 65 14/11/2016 11.2 11.6 7.8 10.0 12 35 15/11/2016 11.2 11.9 10.1 3.3 27 73 16/11/2016 9.5 10.1 20.2 23.4 22 60 17/11/2016 6.5 6.7 17.7 13.0 17 47 18/11/2016 4.9 5.1 15.5 18.8 18 53 19/11/2016 4.2 4.8 5.3 7.4 14 41 20/11/2016 2.6 4.7 3.1 1.6 23 66 21/11/2016 3.5 4.6 14.5 20.7 5 15

We have been down this road before haven't we. This will give you the daily readings as a comma separated value file https://www.wunderground.com/weatherstation/WXDailyHistory.asp?ID=IENGLAND1342&day=22&month=11&year=2016&graphspan=day&format=1 You can use a Firefox addon called DwownThemAll to download the complete series between dates. Then merge the files in DOS (CMD prompt) using: copy *.xxx alldailyfiles.csv Where xxx is the file extension of the download files. Then you need to clean those files up a bit to get rid of the headings. Probably for the small data set just opening up in Excel and sorting/delete is as quick as any. Then you are free to do your conditional averaging.

I have separate MCB and RCD units fitted on outside of bathroom wall. I seem to remember they were about 40 quid. Then you will need a large cable to the shower unit and probably some trunking to hide it.

Have you thought of fitting one of these: http://www.anchorpumps.com/new-stuart-turner-techflo-tp-s1-5-bar-twin-positive-standard-shower-pump-whisper-quiet-range-240v-49084?gclid=CIrV98muvNACFQ5mGwodfQcAhA Similar to what I have hanging off my UVC and Header tank. Does not help you with the heat losses from the small cylinder though.