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Posts
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Days Won
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Everything posted by SteamyTea
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I used to work for the RNIB.
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Stainless Steels in warm, damp and chlorine environments.
SteamyTea replied to SteamyTea's topic in Boffin's Corner
Why I posted it up. -
Just asked your wife and she said she was in a hurry to get home.
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Heat pumps. Any negative points about 3 phase?
SteamyTea replied to saveasteading's topic in Underfloor Heating
Air at 16°C and 75% RH has about 10 grams of water in it per m3. If half of that is removed, to get 5lt of water (5000g), then 2000 m3 of air needs to be processed. That is about 2.5 tonnes. Sounds a lot but is only 23 litres/second. The energy needed to condense the vapour to liquid is 11,300 kg, or about 3 kWh/day, or 130W. From all that, does a large dehumidifier really need to be used, or is the process really inefficient. -
Stainless Steels in warm, damp and chlorine environments.
SteamyTea replied to SteamyTea's topic in Boffin's Corner
What is, making chlorine or preventing it being made? -
Stainless Steels in warm, damp and chlorine environments.
SteamyTea replied to SteamyTea's topic in Boffin's Corner
Chlorine can be produced from seawater quite easily with electrolysis. -
Passive house Shepards hut ?
SteamyTea replied to Waterworks's topic in Energy Efficient & Sustainable Design Concepts
I was helping on my friend's farm. Had to get some sheep into a pen. One just refused to go in and just kept stepping backwards towards me. My farming friend said 'a good sheep will do that for you'. -
Earth Neutral bond for hybrid inverter (again)
SteamyTea replied to jimseng's topic in Photovoltaics (PV)
This is not for normal low voltage, or high voltage, but shows how transformers can be wired differently. You may find a bit more in this, long times since I have read it. Students_Guide_to_the_IET_Wiring_Regulations_-_The_institution_of_engineering_and_technology.pdf -
I fell off my bike, so I'm ravin' mad ....
SteamyTea replied to ToughButterCup's topic in General Self Build & DIY Discussion
That is a shame, we need more creative engineers, even misguided ones. We tried filling a hole in the car park with Postcrete, was a water filled and it never set properly. -
Time for some new Makita goodies- any good deals on?
SteamyTea replied to Crofter's topic in Tools & Equipment
I don't think so, but there may well be some confusion over terminology. Used to use an impact driver for undoing stubborn screws and bolts, they could be revered to tighten up as well. https://en.wikipedia.org/wiki/Impact_driver Then a hammer drill, also know as percussion drill or impact drill. https://en.wikipedia.org/wiki/Hammer_drill So I may well be wrong, but ours at work have this torque increasing mechanism, based on a hammer and anvil. I always think of a 'hammer drill' as something that just vibrates the drill bit up and down as it rotates, but does not increase torque. As I mentioned earlier, it is based on this physics. https://en.wikipedia.org/wiki/Jerk_(physics) -
Time for some new Makita goodies- any good deals on?
SteamyTea replied to Crofter's topic in Tools & Equipment
My understanding of impact drills are really jerk drills. They have a spring, ratchet and rotating mass that is released every rotation. That mass caused a jerk force increases the torque on the drive shaft. Stopping torque is a third power of mass, rather than the second power of speed. -
Passive house Shepards hut ?
SteamyTea replied to Waterworks's topic in Energy Efficient & Sustainable Design Concepts
We could tax them on it. Mine does 35 mpg/tonne (ish), my last car 37 mpg/tonne, but it was not so good. 60 MPG for a 1.6 tonne car as opposed to 62 MPG for a 1.8 tonne now. Many years ago, when I was studying automotive engineering, I read an article about this, seem to remember at the time (1982) that mass divided by 540 gave the gallons per mile. My passengers on Tuesday were most impressed that my car does 4 lt/100 km (they are used to that metric). -
Time for some new Makita goodies- any good deals on?
SteamyTea replied to Crofter's topic in Tools & Equipment
I hate the noise that impact drivers/drills make. Is there a good drill that is non impact, or at least had the facility to turn the feature off. We use Milwaukee stuff at work, the circular saw is very good. Nor so keen on the rest of the kit, though the angle grinder was alright, if a bit on the large side. Mixing makes, if bought in a good deal is not so bad as you often get one charger and two batteries, so saves getting a second charger. -
Earth Neutral bond for hybrid inverter (again)
SteamyTea replied to jimseng's topic in Photovoltaics (PV)
Just a thought, possibly a bad scenario. If there are a number of grid connected system, and one of them is an islanding system that is incorrectly wired in, so it does not disconnect from the grid, would the other systems still be connected and running? I know that most inverters check that grid impedance as part of the running/disconnect protocol, but that may be within tolerances in a rural setting. An unlikely scenario I know, but with millions of systems fitted, unlikely becomes inevitable. -
Ah, Trenton, PA, part of the rust belt. I lived in Meltdown Midtown, PA, slightly more classy. Unless she is on the NJ side.
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I fell off my bike, so I'm ravin' mad ....
SteamyTea replied to ToughButterCup's topic in General Self Build & DIY Discussion
I was with your old Mayor on Tuesday, he is a relative on mine. Did not mention your problems as he now deals with nuclear stuff. Was interesting as we had not seen each other since 1968. -
I fell off my bike, so I'm ravin' mad ....
SteamyTea replied to ToughButterCup's topic in General Self Build & DIY Discussion
One pothole at a time. -
Never go that far in the conversation. That is for another day with them, which I have no idea when it will be, but she is looking to retire to Spain, so less of a journey.
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Just spent a few days with my colonial cousins, one who lives in Walnut Creek, California. She is a very clever, ex banker, and fully qualified accountant, so hates paying for anything. Got chatting about energy bills and she said they were paying $1000/month. Now her house is a lot larger than mine, and they work from home now, so would be more expensive. Now I am home, I thought I would have a look at Californian prices. California prices are 58% higher than the national average, makes my penny per kWh rural surcharge seem quite reasonable. PG&E Rate Rate type Rate per kWh RESIDENTIAL TIME-OF-USE SERVICE FOR PLUG-IN ELECTRIC VEHICLE CUSTOMERS TOU 30-61¢ RESIDENTIAL TIME-OF-USE (PEAK PRICING 4 - 9 p.m. EVERY DAY)- All Electric TOU 36-61¢ Southern Californian Edison Rate Rate type Rate per kWh Option B Residence All-Electric Allocation TOU 18-77¢ Option DT - Single Family All-Electric Allocation TOU 34-59¢ Option DT - Single Family TOU 34-59¢ Time-Of-Use Residential (5-8 PM) Single-Family Residence TOU 29-82¢ Time-Of-Use Residential (Prime) All-Electric Allocation TOU 27-64¢ Option A Single-Family Residence All-Electric Allocation TOU 12-92¢ Time-Of-Use Residential Rate (4-9 PM) Single-Family Residence All-Electric Allocation TOU 30-66¢ Time-Of-Use Residential Rate (4-9 PM) Single-Family Residence TOU 30-66¢ Option A Single-Family Residence TOU 12-92¢ Option B Residence TOU 18-77¢ Data last updated by our partner WattBuy on Feb 8, 2026 San Diego and Electric Co Rate Rate type Rate per kWh DOMESTIC TIME-OF-USE FOR HOUSEHOLDS WITH ELECTRIC VEHICLES, ENERGY STORAGE, OR ELECTRIC HEAT PUMPS TOU 34-72¢ RESIDENTIAL - TIME OF USE SERVICE - DR TOU 29-53¢ COST-BASED DOMESTIC TIME-OF-USE FOR HOUSEHOLDS WITH ELECTRIC VEHICLES TOU 10-71¢ DOMESTIC TIME-OF-USE FOR ELECTRIC VEHICLE CHARGING TOU 27-75¢ DOMESTIC TIME-OF-USE FOR HOUSEHOLDS WITH ELECTRIC VEHICLES TOU 21-70¢ DOMESTIC TIME-OF-USE FOR HOUSEHOLDS WITH A SOLAR ENERGY SYSTEM TOU 31-66¢ RESIDENTIAL TIME-OF-USE - DR2 All Electric TOU 28-68¢
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Interesting couple of days with the new heat pump.
SteamyTea replied to MikeSharp01's topic in Air Source Heat Pumps (ASHP)
70 tonnes of concrete holds about 15.5 kWh.K-1. The losses are about 650W in total, with about 500W going usefully into the house. -
VID_20260211_181431387.mp4
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I think that may be a problem with the OS. Dedicated hardware does not need the same sort of heavy overhead systems to run. But yes, (expletive deleted)ing stupid idea.
