SteamyTea

One advantage of this mini test is that you can fairly safely assume that slab temperature sensor is good enough to get a proxy for the slab surface temperature. Not sure of it is good enough for the air temperature as we have not had any high air temperatures yet. Am I right in thinking that you circulate the water though the slab constantly and then just inject from the ASHP/Buffer when heating is needed? If that is the case, it may be worth looking at the thermal losses from the Buffer and the PHE as they have very long tails and significantly higher temperatures than the slab (7 - 10°C). I shall try and have a look at what is happening at the daily level as I can just use the limited datasets of Slab Internal, Room Air, Outside Air and ASHP Flow temperatures to make it easier to look at. Though in reality, one day off either a bit hotter or a bit colder does not make any real difference to the overall energy usage.

Right, have had a little play this morning and produced two charts. One is the correlation between the invariant of external air temperature and the other against time. I picked these two because we have no control over them and can therefore be used to both correlate and draw implications. There is really not enough data to draw very precise data for the long term, but as the floor surface, slab internal and room air temperature are amazingly stable (basically within the accuracy of the sensors) the 11°C external temperature swings that have recently happened are a good indicator of overall performance. As Jeremy a already said, the ASHP is coming on at around 3AM for about 3 hours. This fits in with the coldest part of the day, though may not be the best time to start heating. That depends on lifestyle and how you like your house heated (It would suit me as I like a warm evening). The slab, on average, has the highest temperature at about 2PM until 1AM. Room air temperature peaks at about 4PM. On the Correlations, everything is pretty flat except the Mean ASHP Flow Temperatures. This is to be expected because if the outside air is warmer, the ASHP will be working less often, rather than delivering a lower flow temperature. This will force the mean flow temperature downwards. I shall try and have a better look later, but life got in my way this morning and only just managed to get home again to pick this up.

Put some money on the Tote, you may get lucky at Kempton Park and can get someone else to carry the tools. https://en.wikipedia.org/wiki/The_Tote

Show him the bit that you have quoted in blue, you can be indignant about it as well. If he had hot taken an interest in the planning notice, that is his look out. 33 years ago I had trouble with a neighbour and his large van blocking the road. Eventually my next door neighbour contacted the company he worked for who explained that they had built him a garage to park the van in (how times have changed). The company went to his place, asked to look in 'their' garage and found he had been hoarding stuff from work. That cured the 'van' problem. Though we did get abusing notes though out letterboxes for a few months.

When collecting data you need to know what you are hoping to achieve. With just one sensor, in one fixed location, all you can collect is he temperature at that spot, at the time you took the reading and only within the accuracy and precision of the sensor. There are a few statistical methods that will allow you to reduce the inaccuracy, but with single point measurement it is impossible to infer what is happening over the whole slab. You say you want to log the 'relative' day by day temperature. This is known as an anomaly i.e. the deviation from the central tendency. This relies on historic data, so as time goes by, it gets more accurate. By only sampling one point, and that point is not that important as you are looking at change, the sampling rate becomes important. So if you only sample once a day, say midnight, you will get a different mean from two samples a day, say noon and midnight. There are two ways around this: More samples, say every 10 minutes Random sample times, say between 120 minutes down to 1 minute Fixed sampling is generally the easiest to understand and gives you plenty of data points to play with later, you can easily 'bin' the data into both time and temperature bins. Random sampling will generally give you a better overall picture of what is going on, but takes longer to collect data for every time bin. As data is easy and cheap to collect, store and process, fixed sampling is probably the easiest. The location of the sensor is a bit harder. Too close to a pipe and it will over read, too far from a pipe and it will under read. This is why we generally use multiple sensors at different locations. Then use a weighted averaging technique (just an arithmetic method to make the sensors show the same temperature regardless of position) to show the temperatures. If I was using single point sampling, then I would place the sensor either 1/3rd or 2/3rd from the pipework. Ideally I would use 3 sensors in one location and a 4th sensor outside of the slab. The 4th sensor would be the 'true' sensor and the one that the others are calibrated against. You can keep this sensor separate an use it to calibrate any other sensors. By using 3 sensors in one location, if one fails, then the other two are still useful, and the sensors are really cheap, I think the lot that turned up yesterday were under £2 each. So for an extra £4, it saves having to pull a wire out, replace and calibrate a replacement, and then feed it back in. And they will fail. One mistake I made when writing a bit of Python script to check and read that sensor was that if the sensor failed, the script stopped. I am not a programmer and have little interest in it, but if it is part of a larger program, it can crash the whole thing, so worth thinking about how to loop around this. One thing I have found out about the DS18B20 is that they do not like high humidity, so either get some ones that are already encapsulated or put them in after the slab had fully dried.

There is a nut and bolt just infront of the cat that don't seem to be fully tightened, is that normal?

Did not matter at the time as they were always on a holiday abroad.

We used them on our spa bath installations. Could get then up to 9 kW. Is it called a Willis Heater after Willis Carrier, the heat pump man.

I was at 'posh school' when I was 11, it was French

Where are you from?

Old friend of mine's brother died cutting up trees after the 1987 storm. Sometimes it is better to "assessing the risk of removing it!"........FFS!

Log down your gas usage at the same time. It is easy to get external temperature data afterwards to correlate it with.

I used to be able to post stuff up as it was for education and research, but technically not allowed to now. An online calculator is probably good enough. http://myelectrical.com/tools/cable-sizing-calculator

Can you post up the tables that show the sizings. My OnSite Guide is out of date (and I don't know where it is now). I seem to remember that is was pretty simple to work out any derating because of insulation.

Was a pretty calm day down here, wind got up a bit this morning, so popped over to North Coast to have a look. Nothing exceptional, Mount's Bay was very calm and the sun was out. Not even the Boy. My daddy left home when I was three And he didn't leave much to ma and me Just this old guitar and an empty bottle of booze. Now, I don't blame him cause he run and hid But the meanest thing that he ever did Was before he left, he went and named me "Sue." Well, he must o' thought that is quite a joke And it got a lot of laughs from a' lots of folk, It seems I had to fight my whole life through. Some gal would giggle and I'd get red And some guy'd laugh and I'd bust his head, I tell ya, life ain't easy for a boy named "Sue." Well, I grew up quick and I grew up mean, My fist got hard and my wits got keen, I'd roam from town to town to hide my shame. But I made a vow to the moon and stars That I'd search the honky-tonks and bars And kill that man who gave me that awful name. Well, it was Gatlinburg in mid-July And I just hit town and my throat was dry, I thought I'd stop and have myself a brew. At an old saloon on a street of mud, There at a table, dealing stud, Sat the dirty, mangy dog that named me "Sue." Well, I knew that snake was my own sweet dad From a worn-out picture that my mother'd had, And I knew that scar on his cheek and his evil eye. He was big and bent and gray and old, And I looked at him and my blood ran cold And I said: "My name is 'Sue!' How do you do! Now your gonna die!!" Well, I hit him hard right between the eyes And he went down, but to my surprise, He come up with a knife and cut off a piece of my ear. But I busted a chair right across his teeth And we crashed through the wall and into the street Kicking and a' gouging in the mud and the blood and the beer. I tell ya, I've fought tougher men But I really can't remember when, He kicked like a mule and he bit like a crocodile. I heard him laugh and then I heard him cuss, He went for his gun and I pulled mine first, He stood there lookin' at me and I saw him smile. And he said: "Son, this world is rough And if a man's gonna make it, he's gotta be tough And I knew I wouldn't be there to help ya along. So I give ya that name and I said goodbye I knew you'd have to get tough or die And it's the name that helped to make you strong." He said: "Now you just fought one hell of a fight And I know you hate me, and you got the right To kill me now, and I wouldn't blame you if you do. But ya ought to thank me, before I die, For the gravel in ya guts and the spit in ya eye Cause I'm the son-of-a-bitch that named you "Sue.'" I got all choked up and I threw down my gun And I called him my pa, and he called me his son, And I came away with a different point of view. And I think about him, now and then, Every time I try and every time I win, And if I ever have a son, I think I'm gonna name him Bill or George! Anything but Sue! I still hate that name!

She is a Good Girl, and still doing it. Got roped into taking a workmate's girlfriend's friend out on a date once. She got very drunk, dropped her trousers in the high street and widdled. That was in Thame, Oxfordshire, and it was only about 7:30 in the evening.

For 6p and no debt against it, I will have it

To Hull and Back was a good episode of Only Fools and Horses. And then there was this from London 0 Hull 4

As I understand it it is a balance between the amount of energy in the gas and the amount of energy recovered when the boiler is condensing. You will probably have to play about with the settings a bit to work out what is best for your set up.

Did he die in the bath?

Someone I used to know had a gas fired hot air system in her house. She used the same guy for years to service it annually. Then she had a fire (probably dust in ducts). As the Fire Service attended they did an investigation. Found out the guy was not qualified to do even a service (think he may have been commercial only, I can't really remember). Just another good reason to avoid gas if you are self building/DIYing.

From an acedemic viewpoint, would building control just check the paperwork and accept it, or would they deem it unacceptable?

Could try a wall paper steamer to get some moisture in.

Savills have a bit of info (watch the scale): http://www.savills.co.uk/research/uk/residential-research/land-indices/development-land-index.aspx And there is also this: http://eureka.sbs.ox.ac.uk/5365/1/2015-8.pdf

You should be able to change the fuse. Not sure of the rating, but would have thought that 2A would do it.