SteamyTea

Is serpentine similar, we have loads of that in Cornwall, and know how to make an area an industrial wasteland better than most.

May have to get permission and a SE involved when drilling through a tower of flats. I am still thinking of getting one to heat my place.

Another monthly temperature record 16 May 2024 Global temperatures last month, which included a heatwave in New Delhi, India (pictured above), were the highest ever recorded for April. This makes it the 11th month in a row to set a record, according to the European Union’s Copernicus Climate Change Service. The average global surface air temperature was 15.03°C (59.05°F). Olivine lets cement go carbon neutral 9 May 2024 Replacing 35 per cent of the regular cement in a concrete mix with silica derived from an abundant mineral called olivine would produce a carbon-neutral cement. Subbing 40 per cent or more would make the final cement carbon negative (Royal Society Open Science, doi.org/mtvt).

Assuming you have some sketches, find an architectural technician and ask what they will cost, they may well know a structural engineer as well.

How timely, I was talking to a man from an MVHR supplier and fitters yesterday at the Swindon show and he said he designed for 3.5 m.s-1 max. But if it did go a bit over, then it was generally not a problem.

Renewables supply 30 per cent of global electricity for the first time The rapid growth of solar power led to a record-breaking year for clean energy generation in 2023, and the year is expected to mark the start of a long-term decline in fossil fuels By Madeleine Cuff 8 May 2024 The rapid growth of solar power in China has changed the world’s electricity mix Costfoto/NurPhoto/Shutterstock Renewables generated a record share of global electricity in 2023 thanks to the rapid growth of wind and solar power. The year marked a turning point in the transition to low-carbon energy, according to think tank Ember, with coal and gas power on the cusp of a long-term decline. Green electricity jumped from 29.4 per cent of total generation in 2022 to 30.3 per cent last year, a new high. This was driven by the rapid rollout of wind and solar power, particularly in China. Hydropower and other renewables, such as bioenergy, made up the remainder of renewable generation. Solar is by far the fastest-growing electricity source, increasing its share of generation from 4.6 per cent in 2022 to 5.5 per cent in 2023. That is the continuation of a long-running trend; since 2000, wind and solar power have gone from generating just 0.2 per cent of global electricity to a record 13.4 per cent today. The share generated by fossil fuels fell from 61.4 per cent in 2022 to 60.6 per cent in 2023, but the amount of electricity produced by these fuels rose slightly because of a 2.2 per cent hike in overall energy demand, mostly in China. Nuclear provided 9.1 per cent of electricity, the same as in 2022. A further surge in wind and solar deployment means that, in absolute terms, fossil fuel generation should fall in 2024 – for the first time outside economic crises or pandemics – even as demand for electricity grows, says Ember’s Hannah Broadbent. “We really think that 2023 was a major turning point in the history of energy,” she says. “Not only did renewables reach this historic milestone, we also believe that it will be the peak of fossil generation as well. We expect from this year that fossil generation will start to decline at a global level.” Fossil fuel generation would have declined in absolute terms in 2023, says Broadbent, but severe droughts in China, India, Vietnam and Mexico curtailed hydropower. Coal plants stepped in to fill the gap, leading to a 1 per cent increase in power sector emissions. Assuming a partial return to normality for hydropower in 2024, Ember says it expects emissions from electricity generation to fall by 4 per cent in 2024, the start of a long-term decline for fossil fuels in the mix. However, green electricity deployment must increase even more rapidly over the coming years to meet the world’s climate goals. Models suggest wind and solar must deliver 40 per cent of global electricity generation by the end of the decade, around triple its current contribution, in order to meet the target of stopping global warming exceeding 1.5°C.

I quite like the idea of separating space heating and DHW. It should be possible to calculate how much extra ventilation is needed to supply the DHW with warmed house air. I would exclude bathroom and kitchen ventilation as these are, generally, variable, and will not coincide very well with the slower heating up of water. It may also be worth looking at A2AHPs for space heating and a Genex system for DHW that works off the MVHR.

Is it a hinge, or a restrictor? Or something combined.

@craig is the world's top window man. He will know.

Ah, never been married, though had a few wives. Can't remember a tube of glue ever being mentioned. Was going to borrow some mechanical fasteners off @Pocster, but they were in use.

It is a story we all want to read.

Welcome Plenty of roof to get PV onto, and no problem digging deeper for a proper amount of insulation under the floor.

First 4 months of this year I am paying 18p/kWh, once taxes and rental added, 23p/kWh. Most of my usage is at night though. So Octopus are not really offering much if your figures include the VAT and meter rental.

Your tools are possibly drawing too much starting current, this will cause the inverter to automatically disconnect. Maybe something like this may help, a soft starter, it limits the initial current (instantaneous current is infinite). https://norwall.com/products/generac-sure-start-16-32-fla-soft-start-kit-8008/ Your Z Book is quite a power hungry laptop, (up to 150W) which is about 10 times what mine draws.

This highlights, very nicely, why restrictions are needed.

Well I went, don't think I shall go to one again. Nothing new or interesting on show and mainly sales, rather than technical.

It can be.

Is 102 kg/m²

I don't want to come across of one of those old codgers that had it tough 45 years ago, but to get enough to raise a deposit, I took on a second job. 60 to 70 hour weeks are hard, and had little social life for a couple of years, but the extra deposit I raised made a huge difference as it gave me more choice. I then had lodgers for a few years. I only gambled once (they call it investment) with half my deposit, and that was buying some BT shares, that doubled in money. The rest I kept in a simple, easy access, deposit account. Saving cash is dull and very tough, but it does help.

We will not allow facts to ruin a good story.

What is actually the fault/problems. May be a simple fix that can be sorted out by members on here.

https://www.engineeringtoolbox.com/heat-recovery-efficiency-d_201.html

It is the mean, free path, velocity. But only in an 'ideal gas'. But as I said earlier, the kelvin scale must be used to get the real factional improvements in performance. It does, but is usually added after the heat exchanger efficiency is calculated. Personally it is not a calculation method I like. Ideally all heat exchangers should be calculated the same way as heat engines. That way all the inputs and outputs are included.

Temperature is not energy.