openspaceman
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Everything posted by openspaceman
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The heat storage is in order to pass back the heat into the liquid air as it expands through a turbine, similarly the cold this generates is stored to cool the air as it is compressed. It is all part of an integrated system to maximise storage efficiency, it will never get close to a battery but should approach pumped hydro efficiency at a fraction of the capital cost. Pumped hydro only stores up to a day's usage. Compressed air was stored and used to start big diesels, often on ships. When I visited the internal fire museum the owner said he went to pick up a diesel engine and its compressed air starter that hadn't been used for over ten years. When he set it up at the museum the air in the tank was still good enough to start the engine, not many batteries would manage that. -
I have never done one with a bar nut but if there is enough meat left in the plastic one of these warmed up and screwed in may work. You will need a new stud to screw into it.
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So won't even manage a boot load of logs on a full charge?
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I suppose yours is the top handle? I see a back handle DUC353Z and two 6Ah batteries is just shy of 500 quid. Maybe ok to fetch a boot load of logs quietly??
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Dinorwig pump storage is a marvel, was designed to absorb electrcity from a local nuclear plant and continues to provide peak lopping now but there are not many places else left for pumped storage. Hydrogen makes no sense to me, very low overall conversion back to power. Liquid air with heat storage is looking good though. The thing is we will be dependent on natural gas for quite a while yet even when a lot more wind and solar PV comes online. My feeling is they will build cheap open cycle gas turbine generators rather than the far more expensive (and thermally efficient) combined cycle gas turbines we depend on for all loads now. The perceived wisdom is they will then only fire up at peak times, the baseload still being provided by nuclear, Drax (unless it gets canned), imports from France and Norway plus the existing CCGT fleet (some of which will be turned off when wind is good).
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Yes I guess that @sime42 did mean drought.
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Long ago I was told wind would prevent UK growing tall trees but I haven't seen an open grown wellingtonia blown down. I have seen lots with their tops taken out by lightning.
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That then begs the question; what is an acceptable small battery saw that uses the same batteries as other portable tools? I discount Stihl as I have had a battery failure on the brushcutter the volunteers use and I want something common with power tools.
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For completeness here are photos of the carb and coil, now that @pleasant has identified it I am not rushing to delve into the innards. It does seem to have a spark screen but I have not yet managed to hook it out through the silencer.
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I now worry about getting ferrex stuff from Aldi, not that I would knock it, my 40V 4" grinder has been a game changer for cutting hydraulic hoses and wire rope cleanly in the field. The problem is they sold the batteries too cheap, people bought them just to strip them of their cells such that spares are no longer available. I have the grinder, impact driver, drill and tyre pump with only three batteries to go between them and nearly got stuffed when the charger broke. I managed to get one off ebay from a bloke who bought surplus stock of chargers when Aldi bailed out. Now I'm thinking I will buy milwaukee stuff; has anyone tried their M18 chainsaws?
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Thanks, you've nailed it. From the faded plastic I thought it was much older.
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I'll try to remember to take more pictures tomorrow
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Picture up now; I checked the magnets and they seemed to be strong enough. I was cutting a boundary overhang in a mate's garden and was wrapping up when he asked me if I could fix it. Initially I could see no spark at all and suspected a poor coil but when I tested the primary at 1.5 Ohms and the secondary at 6k Ohms, which seemed about right, so I had to wait and spin it over in the dark and saw the faint spark. So I resorted to the ether...
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Sorry, added now
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Does anyone recognise this old hedge cutter? The air cleaner reminds me of a pole saw marketed under the Oregon brand in the 80s and it does have an Oregon branded spark plug. The blades have hardly any wear so I don't think it has had much use. It has a very very weak spark but starts with a shot of ether and then runs okay. I have re gapped the coil to flywheel magnets from 0.5mm to 0.3mm and that has made no difference. It will restart immediately from hot but after 5 minutes it will not fire at all with its own fuel. As a first step I'll change the plug but I suspect a carburation problem exacerbated by the poor spark. I am hesitant about fiddling with the carb yet as I do not recognise the type, it has no H or L screws that I can see. I wonder if the coil is a generic one as it looks like the 32F ones that are fitted to a number of small 2t engines.
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Eucalyptus Tree dying off after pollarding??
openspaceman replied to Julie123's question in Homeowners Tree Advice Forum
I was told the fire related strategy was to do with the seedling establishing a root system such that the shoot could be killed off by wildfire which flashed through but the root would survive and this may happen a number of times, the root becoming better established each time. Until finally it could send up a shoot high enough to be above the flames with the stem protected by the bark. This was supposed to explain the poor stability of gum trees planted here when the stem grew away quicker than the root, meaning it was poorly anchored. The chap that told me this said his method was to coppice the tree for a few times before selecting a stem to grow on. -
First heed @peatff and @Muddy42 as clamshell designs are a pain to work on. Second it's one thing repairing a saw you like but another with an unknown fault that's on offer but I'm a sucker for that. If you do take it on then establish what is wrong before looking for parts, dlastore.com was my source for meteor pistons but take a few days to arrive from Greece and always check the price of OEM first, L&S will get them even if on back order.
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I eat meat but don't like a lot on my plate as I prefer a lot of vegetables. I used to walk along Penclawdd beach in north Gower, it is entirely made up of sea shells and the shell fish catch must have been huge. At the same time a mate was doing his degree in marine biology and sampling shells, in the Tawe estuary, for their heavy metal content. At the time he reckoned the shells were getting within 10% of an ore grade worth refining. He also figured an increase of one part per million of lead in the sea had a dramatic negative affect on shell fish. The sea, like the fluid in our bodies, has to remain faintly alkaline, the more it gets toward neutral the less able crustaceans are to fix carbon to carbonate. The more CO2 dissolved in sea water the more carbonic acid. Surface waters are in equilibrium with the atmosphere with regard to carbon dioxide in the ratio 45:55.
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Sad news; I didn't know him well but we used to chat at shows. I had not realised he was that much older than I.
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Arborist/Forestry Apprentice - Devon/Cornwall
openspaceman replied to LynherTraining's topic in Employment
No changes in 40 years years there then apart from the name. -
May be Larger eight-toothed European spruce bark beetle (Ips typographus) - Forest Research WWW.FORESTRESEARCH.GOV.UK Information about larger eight-toothed European spruce bark beetle (Ips typographus), a pest of spruce (Picea) trees and...
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If they are drawing water from aquifers faster than they recharge it is not sustainable either.
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We will definitely have to disagree about that where's @farmer rod? The issue is also about feeding cereals fit for human consumption to cattle
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The fallout from this form of intensive farming affects dairy and beef farming here as people erroneously attribute the same carbon and methane emissions to the, largely, grass fed cattle in UK when they try to persuade people to avoid beef and dairy products. Not to mention Rishi wants us to have hormone fed beef.
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Boiler removal- Herald Hunter.
openspaceman replied to stewie1046's topic in Log burning stoves and fireplaces
Yes but as some heat is conducted through the refractory it then passes through the metal wall to heat the room. On the big industrial wood chip boilers that I worked on the initial off gassing stage was quite cool, about 500C, so as not to damage the feed system and grate ( exhaust gas recirculation was also used to keep things cool). The secondary combustion then took place in a highly insulated tube where all the offgas was burned out at high temperature and then this led to the boiler tubes. The exhaust was then sucked out at a few degrees over 100C. This burned chip at about 35% mc but we often received wetter.
