SteamyTea

If you don't have forced ventilation in a reasonably airtight house, how do you guarantee that each and every room is ventilated properly. Regarding schools and ventilation. Many bad teachers will blame anything but their teaching style. My students never fell asleep in my classes. But everyone did in the materials lectures, and they were first thing on a Tuesday morning. I think the Ofsted inspector fell asleep as 'old John' managed to pass.

Unidentification

How does this recover energy?

North Circular.

I never understand the idea about airing a bedroom, or even the whole house, after the event. I really don't understand the concerns about spare parts for MVHR, these units are more basic than a food mixer. Having said that, choose one with very basic controls, the novelty of a digital display will soon wear off. I think there are basically only two ways to control a motors speed, voltage and frequency (pulsing). So motors, which tend to be made by large manufactured, to a standard form, should be easily replaceable.

And one I am glad not to be in any more. For that money, ~£600k, I will find you a very nice place down there, and throw in a Tesla Model S for the commute.

Ask NASA, they know how to cover up a substandard O Ring.

5 hectares then. 8 woolies to the hectare.

Have I missed some new trend, we are just entering the early 2000 down here.

How big is the field, and how often are they given supplementary nourishment? Probably not for flock then. I had a fair amount of one in last night's Donner Kebab. There was this Scottish guy called Hamish. He had a bad reputation, so I asked him why. His reply was as follows. "You see that house, I built that, do they call me Hamish the builder, no. See that fishing boat, I made that, do they call me Hamish the fisherman, no. But one sheep...."

No. Unless you want to believe it is. One of those legends that refuses to die. It is an amorphous solid, which just means it does not have long range crystalline structure i.e. it is mixed up and chaotic.

A fleece is around 2.5 kg and there are about 15 million flock sheep in the UK. So; 2.5 [kg] 15,000,000 [fleeces] = 37,500 tonnes a year. I have no idea how much is put in a house, but at 0.15kg.m-1 that would be 250,000 m2. Taking a relatively standard detached house, say 10 m by 8m, then the insulated area will be ~200 m2. 250,000 / 200 = 1250 houses. In England, from the start of October 2021 to the end of September 2022, 173,220 houses were completed. So; 1250 / 173220 * 100 = 0.72% could be insulated with fleece, if all the fleece was used. Now, if you want to farm sheep sustainably, you need to keep the numbers per hectare down. With some manual input (which is just importing food from somewhere else) you will be lucky to farm at 10 sheep per hectare. So; 15,000,000 [sheep] / 10 [sheep per hectare] = 1,500,000 hectares. Or 15,000 km2. England has a land area of 130,279 km2. So 15000 [land area for sheep] / 130279 [England land area] * 1000 = 11.5% of the England's land. Now it is unfair to just poo poo an idea without offering an alternative. My alternative would be to replace sheep with PV, which produces about 1 GWh/hectare. year. So 15000 [hectares] x 1 [GWh/hectare) = 15000 GWh/year. That is 15000000000 kWh, or 57,700 kWh for each of the UKs (not just England) houses, a year. I say dress our sheep up and swap them for Chinese PV modules.

There is a John Bishop from Liverpool, told that every house needs a security camera up there.

Are they like this one. Or like this one.

Yes, and mine smarts more than most after last nights trip to the theatre to see a gender neutral version of The Addams Family. (was not gender neutral at all, some wore skirts and dresses, but they all had makeup on. We have long winters down here, but it keeps us off the dog shit covered streets)

Like identical twins, and theatre dwarfs, bilingual people are not to be trusted. (Disclaimer: I am bilingual)

There are many way to skin a cat. I made my own MVHR as a project, had a thermal recovery of about 80%. The two fans where very inefficient as they where just Manrose bathroom extractor fans. But it worked. It did get me thinking that, on a new build, making walls and ceilings the heat exchanger would be pretty simple, lots of surface area, which is the main thing that is needed. Would not be hard to fit in a heating/cooling system as well, that is just pipes.

In Our Time Mercantilism Worth a listen. As is Start the Week, which is on right now.

I am, and it will only get worse over time, though may disappear over the summer. Where is our glazing expert @craig when we need him.

In 2006 I changed my old units because they were all blown, 17 years on, I have to do the same. When I bought them, the guy who made them said that that as I was putting them in timber frames,, the guarantee was only 12 months. I think 3 out of the 14 have not blown.

@Gus Potter You alright mate?

Yes, your skid marks are still showing.

True. And that is where the problem lies. There is an assumption that CO2 levels over a set limit are a cause of drowsiness. High humidity, and high temperatures can cause the same. As can low temperatures, low light levels, time of day etc etc. I wish there was some decent research, but doing large scale, quantitive, public health surveys is expensive, and the usual medial standard of proof in pretty low (1 in 20). There is also the problem of collecting too much data that may show conflicting results, why is the most important part. CO2 sensors need regular calibrating or replacing as well.

There is very little good data about CO2 levels and how people feel in the domestic setting. I put it into the category of having house plants to 'clean the air' and 'lots of natural light'.

If a door has a U-Value of 1W/m2.K, the mean temperature difference over the heating season, of 5 months is 14 K, then: 1 [W.m-2.K-1] x 14 [ΔT] x 5 [months] x 31 [days in month] x 24 [hours in day] = 52,080 Wh.m-2 or 52 kWh.m-2. That is about the same as 5 litres of diesel, which if you by it at the highly taxed gas station will cost about £8. Double it for a 2 m2 door. The U-Value of a door is not the problem.