In a solar heating system the energy gained is during the day is stored in large tanks for use at night.Why is neither pure water or pure ethylene glycol used? O_O please help me.
In a solar heating system the energy gained during the day is usually stored in large tanks for use at night.A mixture of water and ethylene glycol is often used in the system.Why is neither pure water or pure ethylene glycol used? O_O please help me.

Im in high school and i need it 4 a project. i need step by step instructions on how to make a small winmill that upon moving the blades, an LED bulb will glow. I dont have much money 2 spend, so I cant use anything 2 expensive.

If I have a wind turbine, radius of 19 inches, and the tips of the blades are travelling at 30 meters per second, how many rpm’s is the turbine spinning?

Thanks in advance

It’s the first theatre company in the world to do a season off-grid, using solar panels for power.

+ the meaning of the whole sentence pls.

Looking for legitimate plans to build my own, using inexpensive components. Prefer printed material rather than E-book, and valid support info for tech questions

the most profitable field when it comes to renewable energy is solar power. It seems as if the biggest “controversy” regarding solar power is the amount of space required for the solar panels to capture the solar energy which is converted to electricity.

Solar and wind have some limitations, by hydrogen fuel cells – any breakthroughs?
From 2002 article – The next place fuel cells are likely to be widely adopted will not be in cars, but in home power systems. The ongoing cost of fuel and maintenance for a home power unit that uses a fuel cell is about the same as the average utility bill. This is going to change dramatically in the wake of utility deregulation and home power units using fuel cells will become a compelling investment overnight. Don’t forget their purchase may be subsidized for the homeowner or commercial building owner in the form of tax incentives, to boot. http://www.ecoworld.com/articles/fuel_cells_ew.htm

PS. I meant acrylic, or whichever plastic solar panels are normally made out of.

PSS. I am in Europe, so I am mostly familiar with degrees Celsius.

PSSS. Gintable, the tar streets are made of melts at 300 Celsius, and sometimes it melts. My question would be why don’t solar panels achieve that similar high temperature?

I would like idea’s to drumup, or be ingenueis to get more sales. Ex; find general contractors, witch I have. Any more????? I do residental heating and air and I don’t like to sit in the office.I read sales books and listen to tapes.

exactly what the question asks, thanks

I moved into a townhome last week and it does have a central air/heating.
Its a gas appliance based, I know it takes some time to heat up the entire home. To cut down costs of heating/energy bills and make sure we are kept warm in house.

Is it OK to just buy small room heaters and keep near where we are sitting, rather than running the full heating unit ?

I might rent a house that is old and has oil heat. I know nothing about it. I’m mainly concerned with it being safe for children. Can anyone fill me in?

they say we have 40 years left in oil but they also warn that the reserves will slow down dramatically way before then, what will you think will happen if we are not prepared or have a viable alternative
ethanol is a joke it is already causing havoc with the price of corn

I have to move back home before my lease is up in August. My roomate will still be living here. I couldn’t find someone to sublet my room, so I will be (sadly) paying rent for a place that I won’t be living in.

My question is this: Am I responsible for half of the electric bill even though I am not living there, but still on the lease? Electric is not included in our rent, we pay the city, and generally speaking we split the bill in half.

Thanks!

I don’t feel like spending the money
Well I have to drill new holes for the screws and I don’t have an electric mixer