Jump to content
Science Forums


  • Content Count

  • Joined

  • Last visited


About Roadam

  • Rank
  • Birthday 06/18/1988


  • Location
  • Interests
    swordfighting, computer games, science
  • Occupation
    -being taught
  1. Its true that I forgot some of the figures. Its just that all in all the electricity cost comes to about 30% of the cost per mile. So in that sense solar power could come in as the electricity can be pricier but still dont change the economics much. I heard of the project Beter Place, I think its a neat idea. Like a car that costs 35k with battery can be like 20k without it and you pay for the battery usage. Also you can simply build cheap 10k car without a battery and make it compatible.
  2. Tesla model S is advertised as the only car you will ever buy. Which may be, given easily replacable battery, and some parts that do wear out. Thing with electrics is that you buy your mileage beforehand. With 63 cents/wh and about 2000 cycle life you get to about 7$ per 100 miles. Taken that you get 24kwh for 100 miles. 24kwh of electricity costs about 4$ at my place, so total is about 11$ per 100 miles. The diesel I am driving gets me around for about 10$/100 miles.
  3. No matter what the spectrum of the light, if the object is red it emits red wavelenght if its green it emits in green. Although diffrent collors might look diffrent under diffrent types of light. The problem is either overillumination or light flicker. Thats the problem with CFLs, they emit some UV light and the old ones flicker at 100Hz. But newer and more efficient use electronic ballasts which have a frequency of about 20kHz, so flicker cannot be sensed with ordinary methods. I would love to see more LEDs, couse I have a flashlight that has one and its bright as the sun. :) But CFLs ar
  4. Electric water heaters use alot. It takes 12kwh to heat 200 liters from 10 to 60 degrees. If you have central heating, why dont you have loop made trough your hot water boiler? I guess that central heating operates at 40 degrees at least, which is hot enough for a shower. And floor heating the bathroom could also be done trough that. Clothes can be dried trough hanging them near the radiator. Like that: (radiator is on the wall behind the clothes) Takes some time though...
  5. Some US government site: Energy Information Administration (EIA) - Annual Energy Review Energy use for transportation versus electrical energy use is about 3 against 4. Average fuel consumption is about 14l/100 km, that gets you about 140 kwh worth of energy on average(35 MJ per liter for gasoline). Electrical cars get from low aptera type 6kwh/100km to 21kwh for those like tesla and heavier cars. Taking 20kwh average that means about 7 times less energy consumption. 61% of the energy consumption is in gasoline which powers mostly cars, and those could be replaced. So from those 3 parts o
  6. There was a study by the US department of energy that I think said the existing power generation is enough to power the whole vehicle fleet. Not found the reference yet... Let me pose a question: What does actually use electricity at night? Some factories, disco clubs, Vegas, but I think that mostly it is just lights. If someone would turn all the unnecessary ones off, there would probably be loads of juice available. There has been a news report that one town in germany actually switched all the lights off and provided a SMS service for the residents to turn on the lights they need.
  7. We average about 800 with 8 people living in the house. The consumption would be lower if I wouldnt be on the comp so much :lol:, thats about 20%, and one of the three fridges is old and uses another 20%.
  8. In my place wo mostly fertilize with cow manure. If thats not organic what is? Anyway, i think since we grow crops on the same piece of land year after year, nutritions gets used. So adding nitrates is basically good thing in small concentrations. But it also depends on the type of soil. Our small farm provides us with most of the things such as meat, milk, potatoes, etc. which we would have to buy otherwise. And with that in mind it is actually cheaper for us to have a farm. Yield isnt really top notch, but I would like to think its done more cheaply as we do crop rotation, fertilizi
  9. I dont have it set up yet, I am just trying to figure out the easiest way around it. I found the efficiency curve of this kind of a turbine. Its from a book dated some 60 years back when american team done some testing on it. So it seems it has quite good performance at partial flows, but has narrow rpm sweet spot. And since I want everything I can get from my water :teeth:, I would like to run it at that speed for all the different flows I get. And I figure that making load onto the turbine would be easier electronically than to build a transmission. In the end I will probably f
  10. Thank you Modest, I think that this equation nails it. Once I have the equation, crunching numbers is way more easy. :) I will post a few pictures on my own album up here on Hypography. For anyone interested. So far this project is more or less in my head only. I hope it will get down to earth as there are almost no projects I ever completed.
  11. Believe it or not I have already been trough the water measurement manual. Did some homework :) Anyway, the weir method is something I could build but... I only just got the idea for where to put it. The reason I put this thread up is because I found this on the net: Mear's water flow calculator It has instructions and all but its too low resolution to just print it and use it :shrug: But it could be the easiest way to do it. As far as I read about these fumes, especially Parshall one has to be set and built to spec. So it aint that easy. I did actually measure the flow with the me
  • Create New...