SteamyTea

I am not so sure that there is no problem. It is possibly true that in a very well built and managed building variations can be managed effectively. But in a chaotic building i.e. 4 kids and a wife, or maybe a scrapyard in the back garden automatic control could be advantageous. To give you an idea yesterday was sunny. I opened my back windows a crack to draw in some warm air from the front. This works well and saves heating the north east facing kitchen where I live. I forgot that I had done this as the wind was not too strong yesterday. Got home from work, turned the heating on as it was chilly. Had a shower, cup of tea and went to bed. Because my fan heater had tuned off at 21°C, I forgot to turn it off at the mains. This morning I had a lovely warm house. Only cost me 7 kWh. Now if I had MVHR with automatic balancing and control, it would have known that I had the windows open a crack as it would probably not have managed to balance itself properly and issued a warning, or just shut down the area totally. It is hard to quantify without creating a decent model, but at £1/day for that sort of mistake, it is not out of the question financially. I also think that MVHR could be split into separate units. One for the clean side i.e. bedrooms, livingrooms, halls and passageways, and another for the smelly side i.e. bathrooms, toilets and kitchens/utility rooms. Just like space heating and DHW should be split, I think there are gains to be had doing the same with MVHR as you can pick units to suit the different characteristics.

G4 Primer can cause de-lamination after a time though. Not sure it it is caused by mechanical or chemical failure. I suspect the latter. thinking a bit more about this installation, with a few tonnes of concrete poured on to, there really should not be an issue (I forgot about the reinforced slab). It really comes down to the gutters, edges and corners details now to ensure that the insulation is total encapsulated. It is worth checking that the vacuum panels can withstand the styrene fumes.

Except that houses change usage. Doors are left open, as are windows, extensions are added, kids move out, guests come to stay. Sometimes a long bath or shower is taken, sometimes just a minor wee. I am trying to think up a decent driving analogy. Is there any point in a hatchback, or people carrier with it's adaptability. Why not just a van with two two seats. That would do most people.

Could some software not be developed. You set the flow rates for each room/area, have a total overall airflow for the building, then let the unit adjust itself. Would not be easy, but it would be self correcting though its life. So may well be better overall. I am sure that motorised valves and the rest of the hardware need not be that expensive. More a case of just doing it, rather than thinking up reasons not to do it.

I have often wondered why they do not have automatic balancing as standard. Would make installation, commissioning and maintenance dead easy.

You will have no cash left to do anything worthwhile.

I bought one of those last year. I have a project coming up soon. Will see how good it really is.

GRP can bond to cement/concrete. But it can also go horribly wrong. That is why test samples need to be done first. I t is not unusual to coat any unknown porous surface with cobalt accelerator, this just about guarantees that polyester resin will cure, but it can cause shrinking, which may not become apparent for a while. I cannot comment on ashfelt, it has not lasted that long on my shed roof, but on my Mother's flat roof it was over 40 years old (it is GRP now).

To err on the side of caution, EPDM over concrete. It is possible to lay up GRP onto concrete, but would need some rapid ageing tests first. The problem is that there are so many different mixed of concrete and they can have different water content depending on how old they are.

Just a shame that most estate cars/small vans are not designed from the start to take a pile of 8 by 4 sheets in the back.

Steptoe, have you ever thought of having a Dagenham Dustbin scrap yard as you already got the stock.

Tax has run out

Odd that, the Focus Estate is larger in the back than the C-Max. Neither is a nice place to be though.

Make something up that is hinged in the middle that will fit in your existing car. I know doors don't fit into a Ford C-Max. But being sensible, renting a van is the easy and cheap way as you are not going to move doors that often. Or a trailer.

Legend without a loincloth !!

Well I have no idea how long it has been since my last post, but I have now connected via my spare router, which is also connected to the interweb via my laptop, and I got the BME280 working. Managed to find some code that someone had done. So all that is left to do is get a real time clock set up. Really nice little device, shall get some with the memory card slot next.

If we say that it is 0.1m and has an R-Value of 0.6, then that is a U-Value of 16.6 I think, but I may not be thinking straight as it is late and I have been struggling with my ESP2866 all evening.

How thick is the existing slab and is it just regular cast concrete. Concrete has an R-Value of between 0.43 and 0.87 m.K/W

It is a freebie for the Kindle

How are you getting on with the WEMOS I have managed to get mine connected to my router, then access via WebREPL or a USB Serial connection on PuTTY. It reads the DHT22s ok as well. That is as far as I have got. To connect to the router, I modified the boot.py file: # This file is executed on every boot (including wake-boot from deepsleep) #import esp #esp.osdebug(None) import gc import webrepl import network import dht import os import machine webrepl.start() gc.collect() def do_connect(): import network sta_if = network.WLAN(network.STA_IF) if not sta_if.isconnected(): print('connecting to network...') sta_if.active(True) sta_if.connect('XXXXX', 'XXXXX') while not sta_if.isconnected(): pass print('network config:', sta_if.ifconfig()) Next is to work out how to get the Wemos to send temperature data to a network drive. How much 'stuff' and you put into the boot.py file, or is it best to use a main.py file (think that runs at boot too) and use the os commands to run separate micropython files

Can you park a 2 tonne car on it, repeatedly. 150 kpa is about 22 lb to the square inch isn't it.

Could mould in some spikes, that should get the message across

You can make GRP look like brick, or just about anything else. Could make the whole thing from GRP/PU. I think the gutters are parallel to the cars, but I really have no idea. But that is detail that can be solved.

You went to a CofE school then. How about calling up the local metal detectorists, or archaeologists saying you found some treasure. Or the police and saying you burred the Brinks Matt millions there. Ground penetrating radar is another things to try as the diviners are already crying off

I am going to Bucks in a months time, so we can all meet up in MK and I can be proved wrong