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hoefla

Member since Sep 2010 • Last active Oct 2022

Most recent activity

  • in Miscellaneous and Meaningless
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    Oh Bulb emailed me to say that the post office will email me within 10 days and I need ID to collect. It would be easier if they take it off my direct debit.

  • in Miscellaneous and Meaningless
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    The Treasury minister said the case for wealth creation had to be made more to young people, particularly “our young crusty friends sitting there flying around the world on the products of capitalism, tweeting on their phones, one of the most complex supply chains ever known to man”.

    Lol what?!

  • in Miscellaneous and Meaningless
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    It's a slightly nonsensical word, but useful to describe the cool version of warmth.

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    Have the Tories really got less authoritarian and less 'traditional values' in the last 3 years? I don't see it.

  • in Miscellaneous and Meaningless
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    The ways that homes overheat in summer:

    • Heat conducts through the roof/walls from outside to inside, due to poor insulation and made worse by dark colours and direct sun on the outside surfaces.
    • Hot air gets inside through uncontrolled gaps/leaks or open doors/windows.
    • Solar gain (heat from sunlight) comes through windows/openings to the interior and heats up the inside floor/walls/air.
    • Internal heat gains from people, cooking, lighting, washing, computers, fridges etc

    These can be combatted by a combination of insulation, keeping windows closed, external shading and being conscious of how much heat you're producing inside (difficult to avoid, most things we do generate heat).

    Fortunately even in the summer, the UK is relatively cool at night. One of the most effective ways of preventing overheating is to make use of thermal mass to 'store coolth' or buffer heat gains. When outside temps cool down in the evening, open things up and get the heat out of the house, cool down the fabric. Materials like stone, concrete, brick and to some extent plaster, if they start the day cool, will then absorb the heat energy during the day keeping the ambient temp down and giving you more of that radiant thermal comfort by keeping the surface materials cooler for longer. Water also has high thermal mass but it's not that practical to have lots of it sitting around inside.

  • in Miscellaneous and Meaningless
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    External not always more expensive. It's also much less disruptive to you living in your house.
    At some point I'll need to internally insulate the side wall as I don't own the land on the other side, but it'll be a massive pain (it's the wall with kitchen, bathroom and stairs up against it).

  • in Miscellaneous and Meaningless
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    There's a couple of things - one is efficiency of running the home eg damp walls conduct more heat to the outside, the other is how temperature, humidity and damp (condensation) are connected. These affect ambient temps and humidity, which are really important. Thermal comfort (how you feel) is also influenced by other things - a really significant one is radiant heat - if the surfaces in your line of sight (your body's thermal line of sight, really) are cold, you will feel colder. If they are warm you will feel warmer. Internal insulation provides a warm surface. It also improves overall thermal efficiency (less heat lost to the outside), so whatever heat you are inputting leads to warmer temps. The big thing to watch out for is interstitial condensation between the warm insulation and the cold wall. The existing cavity will still be doing a job to prevent damp from the outside getting to the inner leaf, and it will still be doing a job of reducing heat loss but much less significant compared with the new insulation.

    Edit to add: In the summer, another thing to consider is that internal insulation covers up your thermal mass, so overheating is more likely to be a problem - not because of the insulation but because you lose that exposed thermal mass which acts to buffer heat gains.

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    I entered the meter reading, then thought I'd check what the estimates were. FFS.

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