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SteamyTea

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Everything posted by SteamyTea

  1. MGH Where M = mass flow rate kg.m-1.s-1 G = gravity, call it 10 m.s-2 H = height in metres, m
  2. An encased virgin, just waiting for @pocster to turn up.
  3. I am not full of self pity. I wonder if he is still hiding at his mum's near Newquay.
  4. TL;DR (except for @pocster's first ultimate solution). But why not an electromechanical isolator? Shoot the dog and stop washing cars, it is now illegal to entice a boy scout with your puppy for a bob-a-job.
  5. I wonder if titanium is really a suitable material for an immersion heater. Great in a Warthog, but doing a very different job. Inconel is possible better. Water types may also make a difference. What works in my very soft water may not last long in the Chalking Chilterns.
  6. I tried to buy something from eBay using PayPal the other day, said it does not use PayPal anymore.
  7. Do resilience bars work like a spring/damper combination. Simple harmonic motion.
  8. Yes, best ignored. The confusion comes about because of the testing method. During testing the modules are given a flash of light, at a known intensity and while the modules are at a known temperature. Those condition will be extremely rare events in the real world. So rare intact they probably never actually happen.
  9. Work out the mass of the blocks, and the surface area. Concrete has a specific heat capacity of 0.8 kJ/kg and a thermal conductivity of around 2.4 W/m.K. Add to that, the very small amount of energy that can be absorbed in the room, not going to be worth it. I had a thermally leaky door to my porch, so always kept the connecting door shut. I fixed the thermal leaks, now I don't need to keep the connecting door shut. Worth remembering that when the air in the room is hotter than the storage medium, the store is cooling the room as it absorbs the excess energy (which as shown us half a coffee cups worth). Most of the time, the air in the porch will be colder than the concrete storage, but only by a K or 2. So not enough to drive a meaningful temperature change. High mass houses i.e. brick and block, overheat, or underheat, the same as low mass houses i.e timber ones. The important thing is the thermal conductivity and the associated U-Value. There may, on a very rare day, be a time when all the energy inputs and outputs align up and give the impression that 'a news system of heating has been invented'. It is an illusion based on a small sample, and generally not from research done in the UK. We have seasons because of our latitude, and a variable maritime climate because of our geographical location. You can't change those two.
  10. Except for the exception, when at the start of a sentence.
  11. Are we going back to the padded shouldered 1980s?
  12. F = ma Where F = Force in newtons, not Newtons, that was the man, Sir Isaac Newtons. m= mass in kg a = acceleration in meters per second squared, m.s-2. To really confuse, read this about weight. https://en.wikipedia.org/wiki/Weight
  13. Aluminium and steel cables are much more efficient, 3‰ losses instead of 60‰. Fuel cells, fool's cells.
  14. Bitumin is around the 9 mark on the PH scale. Best to keep the soil similar. Not good for growing stuff. Sodic soil has water retention issues as well.
  15. Hydrogen power.
  16. Registration is the first step in controlling a population. Who remembers the fuss when they wanted to issue your NI number on a bit of plastic, instead of card that that the acted like blotting paper.
  17. I find burning paint off, with a flame, very relaxing. The fumes are worrying though.
  18. Staining bar, used to be very common in Morrocan toilets. Or was that just my experience.
  19. Or mass even. Weight should really be banned, mass and force should be the only terms used. Just think how much time I would save now if I had fallen asleep in my Physics lessons.
  20. The company was small. The turbines were 4 or 5 kW. Not large, or worthwhile, but okay as turbines go, if on a hill or SW facing slope. But know what you mean. Electric generation requires large kit, even PV. Best left to the big boys to sort it out.
  21. A kilogram is a standard unit of mass, mass is really the sum of all the 'stuff' in it. Weight is the combination of mass and a force applied to it. Usually Earth's gravity. The unit of Force is mass multiplied by acceleration, with the SI unit N, for newton. Worth remembering that acceleration is a change in speed, and/or direction. It is either positive or negative.
  22. Yes, I had forgotten that. Apparently when they go wrong, you can get a very big bang.
  23. Is that why they are fat?
  24. How does it compare to normal rail mounted. It does seem a little steep, but falls into line at around £1000/kWp. When I worked for the small wind turbine manufacturer, the complete installation cost about £12,000, the turbine was a couple of £2. The financial backers wanted to halve the price, we pointed out that the savings were not to be made on the turbine, but on everything else.
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