SteamyTea

Got mine from PiHut: https://thepihut.com/products/raspberry-pi-zero I bought the kit as I needed the HDMI adapter, the USB adapter and a new PSU. I have a USB to Ethernet cable on order. But to be honest, it is not as small as I hoped when things are plugged in (it would not fit within my CC energy monitor base), so shall stick with the normal ones.

Yes, I saw that, not much use for the DIYer though. I did get myself a Zero the other day. It is a pig to get networked reliably.

" Then, I stand up from my desk and try to get real work done "

How easy would it be to make a speed controller that can be set by pressure sensor data i.e. one inside, one outside. Ideally it would work from a laptop that can also log the pressure differences and voltage and current to the motor.

You can get the data here, if you ask nicely. https://badc.nerc.ac.uk/data/surface/radt_file_format.html I don't have time to look at it at the moment.

The UK had a brighter than usual year last year, unlike 2012 (I think), when it was unusually dark.

Are you going to heat the house when it is unoccupied? This could make a difference to your decisions. If it is left unheated during winter, then there is no need to have the HR part of the MVHR. During the warmer months, you probably don't want heating anyway, so the HR is not needed. I may be worth looking at a passive ventilation system, they are pretty basic really, but a pipe and a venturi. Why are you going for a wood burner? If the house is low energy, you will not need it for heating. If it is for 'cosiness' maybe think of something else.

It will depend on how the fan motor is cooled. If it relies on the incoming air, then it will be a problem. Not sure if you will get enough flow though the system to raise the pressure enough, but that is your you to find out. From an academic viewpoint, I think pressure testing should be both positive and negative. This will test any mechanical seals better (I have "V" seals on my back door). Also, testing should be repeated a few times over a period of time. One of the basic of good science is hypothesis testing and repeatability.

Try Whoopy Cushions, all the chuckling will soon warm a room up.

If you want to save energy, take shorter showers at a lower temperature, got to be easier and cheaper. The separation issue is a good reason to have a batch system using a couple of tanks, one for the waste and one for the incoming water. That way you can use a simple coil heat exchanger in each tank and a small pump. It can then run for as long as it needs to equalise the temperatures. You may find that a simple PV module or 2 and a cheap 500W heating element does the same thing.

The English way, when you disapprove of something, is to say nothing

Thanks.

Don't know what happened there, got a tripple posting. I won't treat it as censorship if someone deletes the first two.

When Jeremy and myself get together, we are like a couple of naughty schoolboys, combined age probably below 25!

Windows 10 and Firefox. No idea about on the tablet as I am using the laptop. Try it in the native browser Edge, or IE10 or whatever it is called now.

Scroll back up a bit.

Press the button

Is there not a risk that the MVHR will draw in smoky air?

Seems pretty good too.

You can get elevation on Google Earth too, not sure at what resolution. https://support.google.com/earth/answer/148134?hl=en

Draw it up on the CAD and get that to work it out. One method would be to use statistics i.e. take cross sectional measurements at fixed/known points and get the mean length/width/depth. I think you can also use vectors to help with the estimation. Rotating it may help too.

It is another, non building, cost you can put down in your spreadsheet. it must be close to £80k by now.

Not really sorting the main problem is it. Most industries can hunt around for some sort of tax break, incentive or grant to use. Can't see that this is any different.

Put them back tonight, take pictures in the morning. Then tomorrow night, move them again. Keep doing that for a week and he will the=ink that he is going a bit mad. You could post him the legislation in an official looking envelope (brown with a window).

I decided to look at my temperature and RH data for my kitchen (25 m3) as this is the room I use the most, and is probably the one with the highest long term humidity (bathroom is short and sweet and is soon sucked out by the fan). By using the maximum RH and AH figures I can calculate what size extraction system I would need. In my place I don't think I have much of a problem.