What is a District Heating System and why do I need it?

Yesterday we gave you problems. Today let’s look at the solution. 👇
A District Heating System is a method of distributing heat through a heating grid by creating a ring main carrying very hot water in highly insulated pipes fed by heat-generating plants at any point round its circumference & sub-grids to distribute hot water directly to homes. /1
Since all options for decarbonising heat are expensive & disruptive it is helpful to focus on the quality of the outcome.

It is the only future-proofed option since any new heat-generating technologies can simply be 'plugged in' to the ring main & feed the existing system. /2
A DHS is a long-term solution to the problem of fuel poverty - there are still-functioning systems 100 years old and Denmark already has more than 60% of houses connected to district heating and is working to increase that to 75%.

So there’s proof it already works! /3
But why should YOU care?

Well it provides by far the least expensive heating bills for households of any of the options &, depending on the mix of heat sources, might even be cheaper than natural gas.

Those bills you’re struggling to pay now? DHS can fix that. /4
But what about me in the countryside?

Feasibility has been done on a DHS which distributes heat over 140km & estimates that it will lose no more than 10% of its heat over that distance. And while the distances in rural areas are clearly greater, installation is much easier. /5
And what about jobs?

It is estimated that a team of ten people could fit about 120 houses a year, meaning that a total workforce of 5,000 would be required to install an initial 60,000 houses annually. /6
Where will we get all the materials from?

Simple answer: right here.

It’s mostly piping we need, which can be sourced domestically if the supply chains to the North Sea oil industry are diversified, & heat exchangers & stores (both are currently manufactured in Scotland). /7
But wont this all be too expensive?

No.

Converting all of Scotland's housing stock would therefore cost approximately £26bn, & cost of installation from a district heating ring-main to each house would be around £10,000 (slightly higher in rural areas). /8
It’s all in our fully-costed, comprehensive #GreenNewDeal for Scotland that will make your bills cheaper, your jobs better, your life happier, & your planet healthier.

Read it today ➡️ commonweal.scot/policies/the-c…

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More from @Common_Weal

May 30
Why is decarbonizing heating so problematic?

In Scotland, 95% of our heating emits greenhouse gasses – the highest proportion in Europe. We need to change on a big scale & invest in a new heating system.

Here’s a thread to explain the challenges we’ll tackle this week. 🧵 /1
There are multiple ways of heating a house:

⚡️ Electricity

☀️ Solar thermal

🪨 Geothermal/heat recovery

⛰ Heat pumps

🏭 Industrial heat recovery

🗑 Waste incineration

🪵 Biomass

🔥 Biofuels

🅷 Hydrogen

But all of them present significant challenges…

/2
⚡️ Electricity

Would require all existing radiators & pipework to be removed/replaced, & double pressure on the grid which is esp challenging when usage in peak periods creates instability.

This is an expensive way to do it & could lead to a x3 increase in heating bills. /3
Read 12 tweets
May 29
The Common Home Plan pulled together lots of our previous research, and other campaigners, activists, and researchers.

If you want to share particular pieces of policy with your MSP, MP or Cllr, without them having to go through the whole #GreenNewDeal, then take a look below 👇
Building Scotland’s Future Now

A proposal to build a public-owned Scottish National Infrastructure Company to manage public investment and local procurement.

commonweal.scot/policies/build…
Read 8 tweets
May 28
Buildings/insulation is not a particularly ‘sexy’ political topic, but undoubtedly one of the *most* crucial tasks of a #GreenNewDeal

We must stop heat leaks & upgrade/insulate our houses so they can achieve 70 - 90% thermal efficiency.

Take a look below to find out how 👇 /1
Achieving maximal thermal performance is likely to be unachievable in many houses & in many where it might be technically achievable, getting the last ten per cent or so of efficiency may be so expensive as to be prohibitive. /2
The Passivhaus standard assumes a thermal performance of 25 kWh/m2 per year, an 85% reduction in current average heating requirement & where this is achievable it is certainly desirable. The addition of zero-carbon heating infrastructure should help achieve the remaining %.

/3
Read 10 tweets
Jan 24
Today's Long Read: ScotWind Up 🌬

@thecommongreen explains how what sounds like a large windfall from auctioning off our offshore wind potential, amounts to less than a stiff breeze compared to what we could have had if we'd kept our resources in public hands. /1
@thecommongreen Last week celebrated the £700m auction of Scotland’s offshore wind potential & the rent that will accrue to Scotland when the turbines are finally built. Based on the published figures for the rent per MWh & typical wind turbine performance, this could be £50-90m a year. /2
@thecommongreen Additionally, the complex web of fossil-fuel companies, foreign state-owned energy companies & financial holding companies standing behind as shareholders stand to earn profits of something like £5b per year once everything is developed & operational. /3
Read 8 tweets

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