Posts Tagged ‘24 Hours’

Where Does Electricity Come From Part IV

Electricity in large scale cannot be produced by chemical cells, and has to be done the magnetic way. Make a conductor cut a magnetic line, and wa la, you get a current flow in it. So, in a large scale, it has to be generated at Power stations, where huge amounts of energy is present or is diverted to from other energy sources. These sources can be heat, and gravity, or light(though not in a large scale), or Wind (not the one that comes out of you).

The hydro electric power station uses gravity. It uses gravity to transport water from a Dam to the turbines, and then turn them to produce power.

Water seems to be indespensable when it comes to generating electricity in huge volumes in most places. Hydro electric plants, as the name suggests uses water, and so does the Thermal and Nuclear Power stations.

Thermal Power Stations

Thermal power stations have huge boilers dedicated for each generator that they have. These boilers are structures made with solid metal made with extreme care and perfection that they can hold steam in pressures equivalent to that of the water pressure that is 5 KM below the sea level. If a live man is put inside it, he would die of the heat first, and then his body would be compressed to a hair strand in seconds.

The bottom of these boilers are pumped with water and recycled steam from the turbines (so as not to waste energy), and the source of heat in these power stations are coal or lignite that burn in a huge furnace built at the bottom of the boiler. The heat in these furnaces can reach over 1000 degrees Celsius, hot enough to melt iron. Luckily these boilers are made with alloys that can withstand the heat.

Coal or lignite what ever is used, is ground into fine dust and is sprayed with great force into the furnace with a blower, ideally mixed with pure air that has a lot of oxygen. This produces very high effeciency, and makes sure that each and every particle of the coal is burnt, and the furnace is built so well that the heat is effected fully on the boiler, and the smoke, after loosing most of its heat to the boiler and flows out thru the chimney. Ofcourse, government regulations are in place to make sure that the smoke that leaves the furnace are filtered so well off the carbon so that it doesnt pollute the air.

Thus, the water is boiled and converted into steam, and the steam is held in high preassure inside the boiler, which is something like a massive pressure cooker. The outlet of the boiler is usually at its top, and steam is directed thru pipes controlled by automated regulatory valves, which is similar to the governor valves found in Hydro Electric power plants, and is passed on to the turbine chamber.

The turbine chamber is a highly enclosed areo dynamic circular chamber into which the steam is passed, and made to blow into the blades of the turbine, and after a full rotation, it is let out and is passed back to the boiler where it is recycled.

The speed of the generator is controlled by the valve which controls the flow of the steam.

Contd…….

Migrating a Plesk Server

Trust me, its the most difficult job in the world. You can transfer cargo, just put them in containers and load them on ships and unload them where ever you want, but backing up with plesk from the old server and moving it to the new server and restoring it there is the most difficult thing that I have ever done.

Personally I have shifted homes, I have shifted offices, shifted my own websites between servers before I started a hosting company, and now I find that all very easy. No matter how many men you have to do the work, you cant work any faster than the server would. Plesk is dead slow, and with all those sites working on the server, and with clients from all over the world, there is no off peek time for your server, you will never make it.

Plesk has a backup restore function, which you need to use from the remote desktop. Create the backup selecting resellers or domains in each task, and once its complete, move the backup file to the new server, and restore it there thru the plesk bakcup resotre function.

Sounds easy? It will, till you see it. I had 12 people working on it for 24 hours a day for nearly 20 days last year to get 1 server migrated. And in the last leg of the migration, the hard disk failed on the old server, and unfortunately, the backup files that we had created were yet to be moved to the new server, and all data was lost.

Just google with indyahozting and you will find out the bad reviews that we had got because of that. But still, we were quick enough to get the new server ready and ask people to upload the backups that they have had. Luckily most of the clients had their backups handy, and they restored all files, except for the few ones, who just decided to write about us on the forums.

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