SteamyTea

Members
  • Content Count

    6,214
  • Joined

  • Days Won

    20

SteamyTea last won the day on September 20

SteamyTea had the most liked content!

Community Reputation

1,353 Excellent

2 Followers

About SteamyTea

  • Rank
    Advanced Member

Recent Profile Visitors

3,286 profile views
  1. Could probably make a stab at it, and because of its age, it will be quite high. How many miles has it done? Then there is 'green' and 'green', just as there is 'eco' and 'sustainable'. They are just nonsense terms. My car passed its MOT today, still on the original rear brakes and clutch. The carbon cost, after 13 years and 155k will be quite low, but you have to take into account that 117k of those miles are in the last 5 years. If I had got an EV, say a Leaf, that would have been even lower.
  2. I have done a preempted strike.
  3. Yes it does, as does many manufacturing processes. Most Lithium is not mined, it is extracted using water. Bolivia, Argentina, and Chile are the main producers and though it is true that some areas have water scarcity and compete with agriculture, those areas are not the most productively agriculturally. The idea is to lift subsistence farming out of the dark ages with the cash that the lithium can generate. It is similar to putting a solar farm on agricultural land, the worst land is used, not the best. The best land still generates a much larger income than PV can. I would also think that a modern lithium processing plant is a lot cleaner that a cast iron smelting plant. A kWh of Lithium battery storage takes about 136 kWh of energy to produce (https://learn.openenergymonitor.org/sustainable-energy/energy/cars). That is about 14 litres of gasoline. How far does a car go on 3 gallons, 150 miles? If you get 200 cycles out of that kWh of lithium storage, that is around 400 miles. A factor of 3 better even in a large EV that uses 500Wh/mile (and some are twice as good as that). Not in the same league at all. Nothing unusual in that, I suspect that my car tyres have a similar 'product miles', as does my mobile phone, and a lot of the food I eat. What happen is that the final product will be produced at the lowest costs, it is not transported, or processed, more than it needs to be. That is just the economics of manufacturing, Adam Smith wrote about all this in 1776, and it had been going on for centuries before than. The Tesla installation was a marketing stunt and was to stop the grid disconnection due to lack of generation capacity in Southern Australia. I notice that it is now getting an upgrade to 193.5 MWh/150MW. Technically it it does not matter if the storage is centralised or distributed (I wrote about this a few years ago if you remember), it is really down to costs. If it is cheaper to put in storage than a new generation plant, then storage is the way to go. It is all to do with marginal costs, not overall capacity. And Australia is one of the worlds worst polluters per capita, hardly a beacon of 'green' virtue.
  4. And they can discontinue the service if they like, which could work out costly. I am, not sure you are.
  5. Good idea as it is a nerdy detail thing phase balancing.
  6. Where I live there is 6 houses, the 3phase is evenly split between us. One problem with having a PV on a house is using the power evenly. Battery storage makes this easier. As does having a 3phase car charger. May be worth having a 3phase heat pump as well. Worth spending time on diversity calculations as some minor gains can be had there.
  7. This may be of some help. I think it is the latest version. Been a decade since I was doing them, things were more basic then. https://mcscertified.com/wp-content/uploads/2019/08/MIS-3005.pdf And the MCS estimator https://mcscertified.com/wp-content/uploads/2019/09/MCS_031_MCS_Heat_Pump_System_Performance_Estimate_Issue-2.1.xlsm
  8. Right, first thing is to let us all know how much oil you use, in litres, not cash. And preferably if you can split the usage into heating and non heating times. This will give an idea if how much is used for hot water (DHW) and house heating (space). If you read up about ASHPs you will notice people saying about over sizing them. This is not a mistake, they perform better when working at about 70% of the maximum rated output. This is quite different from gas and oil heating which generally performs best when at, or close to, maximum output. Floor area can be a bit confusing, there is a formula that allows for livable area and one that is for total area. Livable area (excluded hallways, landings and bathrooms I think) will always be smaller. Also the external wall/door/window area is important, a bungalow, terraced, semi detached and detached will all have different thermal losses. If you are up for a challenge, you can calculate simple losses if you know the U-Value of all the build components.
  9. Think it depends on how accurate you need it. The simple way is to put a heat meter on the output pipe (really just a flow meter and temperature sensor) and an electric energy meter on the input. A cheaper way may be to put 4 temp sensors in. Two for the air temperature either side of the radiator, one on the flow out of the HP and another on the return pipe. That would give extra useful information about how your UFH is performing. That is basically what we have done to your MVHR (I wonder if it is still logging as been left untouched for about 18 months now). A quick Google to refresh my memory shows that: CoP(heating) = T(h) / T(h) - T(c) And CoP (cooling) = T(c) / T(h) - T(c) So maybe only 3 sensors, which is easy to set up. May be worth putting a fan and pump sensors on so that time of day usage is logger. That can be correlated to the electrical energy logger I put in. And then some RH sensors just for a giggle.
  10. And you are not allowed to reuse them as far as I know.
  11. At least we all know who to call when GRP roofing needs doing in your area. Seems they did it in nice, easy to manage, sections. Idiots try to do too much, too quickly. And your main contractor will hopefully learn from this. There is nothing wrong with GRP when done properly. I should last decades.
  12. We used to make some very large components, such as the walk way at St. Mary's Hospital, London. The expansion/contraction was often mentioned, but no special measures put in place. We also made tooling for car seats, these are thermally cycled dozen of times a day, no issues. When I did my HND in Mechanical Engineering, one of the 'problems' to solve was the strength of two linked materials. It was usual to use copper and steel as the examples. I used glass and polyester resin. It had less movement for any given load in any direction than the usual examples. Re the contractor, I notice that they it says 'Glassfibre' and no fibreglass on the side of the van. Always a good sign.
  13. Looks better. Just goes to show that people that know what they are doing can do a decent job.
  14. Reverse image search. Change google to look for just images, then select your pre-saved image and drag it into the search box. Let google do its thing and if the image is popular, it will show other location of it. Regarding getting a spanking from suppliers, if we have a problem we ask our suppliers to send their best possible sample. If it is better than they supply us, they loose the business. What does Marsellus Wallace look like?
  15. If you IWI then you can also put in a service cavity for pipes and cables.